4c7e9f23da
and seems like generally sensible (more sensible than not doing so), so done in generic code rather than compat glue only Change proposed in PR kern/18767 by Emmanuel Dreyfus.
2034 lines
47 KiB
C
2034 lines
47 KiB
C
/* $NetBSD: sys_pipe.c,v 1.32 2002/12/05 16:30:55 jdolecek Exp $ */
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/*
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* Copyright (c) 1996 John S. Dyson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Absolutely no warranty of function or purpose is made by the author
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* John S. Dyson.
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* 4. Modifications may be freely made to this file if the above conditions
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* are met.
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*
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* $FreeBSD: src/sys/kern/sys_pipe.c,v 1.95 2002/03/09 22:06:31 alfred Exp $
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*/
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|
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/*
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* This file contains a high-performance replacement for the socket-based
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* pipes scheme originally used in FreeBSD/4.4Lite. It does not support
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* all features of sockets, but does do everything that pipes normally
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* do.
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*
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* Adaption for NetBSD UVM, including uvm_loan() based direct write, was
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* written by Jaromir Dolecek.
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*/
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|
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/*
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* This code has two modes of operation, a small write mode and a large
|
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* write mode. The small write mode acts like conventional pipes with
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* a kernel buffer. If the buffer is less than PIPE_MINDIRECT, then the
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* "normal" pipe buffering is done. If the buffer is between PIPE_MINDIRECT
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* and PIPE_SIZE in size, it is fully mapped into the kernel (on FreeBSD,
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* those pages are also wired), and the receiving process can copy it directly
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* from the pages in the sending process.
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*
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* If the sending process receives a signal, it is possible that it will
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* go away, and certainly its address space can change, because control
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* is returned back to the user-mode side. In that case, the pipe code
|
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* arranges to copy the buffer supplied by the user process on FreeBSD, to
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* a pageable kernel buffer, and the receiving process will grab the data
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* from the pageable kernel buffer. Since signals don't happen all that often,
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* the copy operation is normally eliminated.
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* For NetBSD, the pages are mapped read-only, COW for kernel by uvm_loan(),
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* so no explicit handling need to be done, all is handled by standard VM
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* facilities.
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*
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* The constant PIPE_MINDIRECT is chosen to make sure that buffering will
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* happen for small transfers so that the system will not spend all of
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* its time context switching. PIPE_SIZE is constrained by the
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* amount of kernel virtual memory.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sys_pipe.c,v 1.32 2002/12/05 16:30:55 jdolecek Exp $");
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|
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/filio.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/ttycom.h>
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#include <sys/stat.h>
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <sys/uio.h>
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#include <sys/lock.h>
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#ifdef __FreeBSD__
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#include <sys/mutex.h>
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#endif
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#ifdef __NetBSD__
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|
#include <sys/select.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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#include <uvm/uvm.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#endif /* NetBSD, FreeBSD */
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|
|
|
#include <sys/pipe.h>
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|
|
|
#ifdef __NetBSD__
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/*
|
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* Avoid microtime(9), it's slow. We don't guard the read from time(9)
|
|
* with splclock(9) since we don't actually need to be THAT sure the access
|
|
* is atomic.
|
|
*/
|
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#define vfs_timestamp(tv) (*(tv) = time)
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|
|
/* we call it sel_klist */
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#define sel_note sel_klist
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|
|
|
#endif
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|
|
|
/*
|
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* Use this define if you want to disable *fancy* VM things. Expect an
|
|
* approx 30% decrease in transfer rate. This could be useful for
|
|
* OpenBSD.
|
|
*/
|
|
/* #define PIPE_NODIRECT */
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|
|
|
/*
|
|
* interfaces to the outside world
|
|
*/
|
|
#ifdef __FreeBSD__
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static int pipe_read(struct file *fp, struct uio *uio,
|
|
struct ucred *cred, int flags, struct thread *td);
|
|
static int pipe_write(struct file *fp, struct uio *uio,
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|
struct ucred *cred, int flags, struct thread *td);
|
|
static int pipe_close(struct file *fp, struct thread *td);
|
|
static int pipe_poll(struct file *fp, int events, struct ucred *cred,
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|
struct thread *td);
|
|
static int pipe_kqfilter(struct file *fp, struct knote *kn);
|
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static int pipe_stat(struct file *fp, struct stat *sb, struct thread *td);
|
|
static int pipe_ioctl(struct file *fp, u_long cmd, caddr_t data, struct thread *td);
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|
|
|
static struct fileops pipeops = {
|
|
pipe_read, pipe_write, pipe_ioctl, pipe_poll, pipe_kqfilter,
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|
pipe_stat, pipe_close
|
|
};
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|
|
|
#define PIPE_GET_GIANT(pipe) \
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|
do { \
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|
PIPE_UNLOCK(wpipe); \
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|
mtx_lock(&Giant); \
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|
} while (/*CONSTCOND*/ 0)
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|
|
|
#define PIPE_DROP_GIANT(pipe) \
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|
do { \
|
|
mtx_unlock(&Giant); \
|
|
PIPE_LOCK(wpipe); \
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|
} while (/*CONSTCOND*/ 0)
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|
|
|
#endif /* FreeBSD */
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|
|
|
#ifdef __NetBSD__
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static int pipe_read(struct file *fp, off_t *offset, struct uio *uio,
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|
struct ucred *cred, int flags);
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static int pipe_write(struct file *fp, off_t *offset, struct uio *uio,
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|
struct ucred *cred, int flags);
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static int pipe_close(struct file *fp, struct proc *p);
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static int pipe_poll(struct file *fp, int events, struct proc *p);
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|
static int pipe_fcntl(struct file *fp, u_int com, caddr_t data,
|
|
struct proc *p);
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|
static int pipe_kqfilter(struct file *fp, struct knote *kn);
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|
static int pipe_stat(struct file *fp, struct stat *sb, struct proc *p);
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static int pipe_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p);
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|
|
static struct fileops pipeops =
|
|
{ pipe_read, pipe_write, pipe_ioctl, pipe_fcntl, pipe_poll,
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pipe_stat, pipe_close, pipe_kqfilter };
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|
|
/* XXXSMP perhaps use spinlocks & KERNEL_PROC_(UN)LOCK() ? just clear now */
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|
#define PIPE_GET_GIANT(pipe)
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|
#define PIPE_DROP_GIANT(pipe)
|
|
#define GIANT_REQUIRED
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|
|
|
#endif /* NetBSD */
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|
|
|
/*
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|
* Default pipe buffer size(s), this can be kind-of large now because pipe
|
|
* space is pageable. The pipe code will try to maintain locality of
|
|
* reference for performance reasons, so small amounts of outstanding I/O
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|
* will not wipe the cache.
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|
*/
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#define MINPIPESIZE (PIPE_SIZE/3)
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#define MAXPIPESIZE (2*PIPE_SIZE/3)
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|
|
|
/*
|
|
* Maximum amount of kva for pipes -- this is kind-of a soft limit, but
|
|
* is there so that on large systems, we don't exhaust it.
|
|
*/
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|
#define MAXPIPEKVA (8*1024*1024)
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|
static int maxpipekva = MAXPIPEKVA;
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|
|
|
/*
|
|
* Limit for direct transfers, we cannot, of course limit
|
|
* the amount of kva for pipes in general though.
|
|
*/
|
|
#define LIMITPIPEKVA (16*1024*1024)
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|
static int limitpipekva = LIMITPIPEKVA;
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|
|
|
/*
|
|
* Limit the number of "big" pipes
|
|
*/
|
|
#define LIMITBIGPIPES 32
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|
static int maxbigpipes = LIMITBIGPIPES;
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|
static int nbigpipe = 0;
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|
|
|
/*
|
|
* Amount of KVA consumed by pipe buffers.
|
|
*/
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|
static int amountpipekva = 0;
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|
|
static void pipeclose(struct pipe *cpipe);
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|
static void pipe_free_kmem(struct pipe *cpipe);
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|
static int pipe_create(struct pipe **cpipep, int allockva);
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|
static __inline int pipelock(struct pipe *cpipe, int catch);
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|
static __inline void pipeunlock(struct pipe *cpipe);
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|
static __inline void pipeselwakeup(struct pipe *cpipe, struct pipe *sigp);
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|
#ifndef PIPE_NODIRECT
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|
static int pipe_direct_write(struct pipe *wpipe, struct uio *uio);
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|
#endif
|
|
static int pipespace(struct pipe *cpipe, int size);
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|
|
|
#ifdef __NetBSD__
|
|
#ifndef PIPE_NODIRECT
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|
static int pipe_loan_alloc(struct pipe *, int);
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|
static void pipe_loan_free(struct pipe *);
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|
#endif /* PIPE_NODIRECT */
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|
|
|
static struct pool pipe_pool;
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|
#endif /* NetBSD */
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|
|
|
#ifdef __FreeBSD__
|
|
static vm_zone_t pipe_zone;
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|
|
|
static void pipeinit(void *dummy __unused);
|
|
#ifndef PIPE_NODIRECT
|
|
static int pipe_build_write_buffer(struct pipe *wpipe, struct uio *uio);
|
|
static void pipe_destroy_write_buffer(struct pipe *wpipe);
|
|
static void pipe_clone_write_buffer(struct pipe *wpipe);
|
|
#endif
|
|
|
|
SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_ANY, pipeinit, NULL);
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|
|
|
static void
|
|
pipeinit(void *dummy __unused)
|
|
{
|
|
|
|
pipe_zone = zinit("PIPE", sizeof(struct pipe), 0, 0, 4);
|
|
}
|
|
#endif /* FreeBSD */
|
|
|
|
/*
|
|
* The pipe system call for the DTYPE_PIPE type of pipes
|
|
*/
|
|
|
|
/* ARGSUSED */
|
|
#ifdef __FreeBSD__
|
|
int
|
|
pipe(td, uap)
|
|
struct thread *td;
|
|
struct pipe_args /* {
|
|
int dummy;
|
|
} */ *uap;
|
|
#elif defined(__NetBSD__)
|
|
int
|
|
sys_pipe(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
#endif
|
|
{
|
|
struct file *rf, *wf;
|
|
struct pipe *rpipe, *wpipe;
|
|
int fd, error;
|
|
#ifdef __FreeBSD__
|
|
struct mtx *pmtx;
|
|
|
|
KASSERT(pipe_zone != NULL, ("pipe_zone not initialized"));
|
|
|
|
pmtx = malloc(sizeof(*pmtx), M_TEMP, M_WAITOK | M_ZERO);
|
|
|
|
rpipe = wpipe = NULL;
|
|
if (pipe_create(&rpipe, 1) || pipe_create(&wpipe, 1)) {
|
|
pipeclose(rpipe);
|
|
pipeclose(wpipe);
|
|
free(pmtx, M_TEMP);
|
|
return (ENFILE);
|
|
}
|
|
|
|
error = falloc(td, &rf, &fd);
|
|
if (error) {
|
|
pipeclose(rpipe);
|
|
pipeclose(wpipe);
|
|
free(pmtx, M_TEMP);
|
|
return (error);
|
|
}
|
|
fhold(rf);
|
|
td->td_retval[0] = fd;
|
|
|
|
/*
|
|
* Warning: once we've gotten past allocation of the fd for the
|
|
* read-side, we can only drop the read side via fdrop() in order
|
|
* to avoid races against processes which manage to dup() the read
|
|
* side while we are blocked trying to allocate the write side.
|
|
*/
|
|
FILE_LOCK(rf);
|
|
rf->f_flag = FREAD | FWRITE;
|
|
rf->f_type = DTYPE_PIPE;
|
|
rf->f_data = (caddr_t)rpipe;
|
|
rf->f_ops = &pipeops;
|
|
FILE_UNLOCK(rf);
|
|
error = falloc(td, &wf, &fd);
|
|
if (error) {
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
FILEDESC_LOCK(fdp);
|
|
if (fdp->fd_ofiles[td->td_retval[0]] == rf) {
|
|
fdp->fd_ofiles[td->td_retval[0]] = NULL;
|
|
FILEDESC_UNLOCK(fdp);
|
|
fdrop(rf, td);
|
|
} else
|
|
FILEDESC_UNLOCK(fdp);
|
|
fdrop(rf, td);
|
|
/* rpipe has been closed by fdrop(). */
|
|
pipeclose(wpipe);
|
|
free(pmtx, M_TEMP);
|
|
return (error);
|
|
}
|
|
FILE_LOCK(wf);
|
|
wf->f_flag = FREAD | FWRITE;
|
|
wf->f_type = DTYPE_PIPE;
|
|
wf->f_data = (caddr_t)wpipe;
|
|
wf->f_ops = &pipeops;
|
|
p->p_retval[1] = fd;
|
|
rpipe->pipe_peer = wpipe;
|
|
wpipe->pipe_peer = rpipe;
|
|
mtx_init(pmtx, "pipe mutex", MTX_DEF);
|
|
rpipe->pipe_mtxp = wpipe->pipe_mtxp = pmtx;
|
|
fdrop(rf, td);
|
|
#endif /* FreeBSD */
|
|
|
|
#ifdef __NetBSD__
|
|
rpipe = wpipe = NULL;
|
|
if (pipe_create(&rpipe, 1) || pipe_create(&wpipe, 0)) {
|
|
pipeclose(rpipe);
|
|
pipeclose(wpipe);
|
|
return (ENFILE);
|
|
}
|
|
|
|
/*
|
|
* Note: the file structure returned from falloc() is marked
|
|
* as 'larval' initially. Unless we mark it as 'mature' by
|
|
* FILE_SET_MATURE(), any attempt to do anything with it would
|
|
* return EBADF, including e.g. dup(2) or close(2). This avoids
|
|
* file descriptor races if we block in the second falloc().
|
|
*/
|
|
|
|
error = falloc(p, &rf, &fd);
|
|
if (error)
|
|
goto free2;
|
|
retval[0] = fd;
|
|
rf->f_flag = FREAD;
|
|
rf->f_type = DTYPE_PIPE;
|
|
rf->f_data = (caddr_t)rpipe;
|
|
rf->f_ops = &pipeops;
|
|
|
|
error = falloc(p, &wf, &fd);
|
|
if (error)
|
|
goto free3;
|
|
retval[1] = fd;
|
|
wf->f_flag = FWRITE;
|
|
wf->f_type = DTYPE_PIPE;
|
|
wf->f_data = (caddr_t)wpipe;
|
|
wf->f_ops = &pipeops;
|
|
|
|
rpipe->pipe_peer = wpipe;
|
|
wpipe->pipe_peer = rpipe;
|
|
|
|
FILE_SET_MATURE(rf);
|
|
FILE_SET_MATURE(wf);
|
|
FILE_UNUSE(rf, p);
|
|
FILE_UNUSE(wf, p);
|
|
return (0);
|
|
free3:
|
|
FILE_UNUSE(rf, p);
|
|
ffree(rf);
|
|
fdremove(p->p_fd, retval[0]);
|
|
free2:
|
|
pipeclose(wpipe);
|
|
pipeclose(rpipe);
|
|
#endif /* NetBSD */
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Allocate kva for pipe circular buffer, the space is pageable
|
|
* This routine will 'realloc' the size of a pipe safely, if it fails
|
|
* it will retain the old buffer.
|
|
* If it fails it will return ENOMEM.
|
|
*/
|
|
static int
|
|
pipespace(cpipe, size)
|
|
struct pipe *cpipe;
|
|
int size;
|
|
{
|
|
caddr_t buffer;
|
|
#ifdef __FreeBSD__
|
|
struct vm_object *object;
|
|
int npages, error;
|
|
|
|
GIANT_REQUIRED;
|
|
KASSERT(cpipe->pipe_mtxp == NULL || !mtx_owned(PIPE_MTX(cpipe)),
|
|
("pipespace: pipe mutex locked"));
|
|
|
|
npages = round_page(size)/PAGE_SIZE;
|
|
/*
|
|
* Create an object, I don't like the idea of paging to/from
|
|
* kernel_object.
|
|
*/
|
|
object = vm_object_allocate(OBJT_DEFAULT, npages);
|
|
buffer = (caddr_t) vm_map_min(kernel_map);
|
|
|
|
/*
|
|
* Insert the object into the kernel map, and allocate kva for it.
|
|
* The map entry is, by default, pageable.
|
|
*/
|
|
error = vm_map_find(kernel_map, object, 0,
|
|
(vm_offset_t *) &buffer, size, 1,
|
|
VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
|
|
if (error != KERN_SUCCESS) {
|
|
vm_object_deallocate(object);
|
|
return (ENOMEM);
|
|
}
|
|
#endif /* FreeBSD */
|
|
|
|
#ifdef __NetBSD__
|
|
/*
|
|
* Allocate pageable virtual address space. Physical memory is allocated
|
|
* on demand.
|
|
*/
|
|
buffer = (caddr_t) uvm_km_valloc(kernel_map, round_page(size));
|
|
if (buffer == NULL)
|
|
return (ENOMEM);
|
|
#endif /* NetBSD */
|
|
|
|
/* free old resources if we're resizing */
|
|
pipe_free_kmem(cpipe);
|
|
#ifdef __FreeBSD__
|
|
cpipe->pipe_buffer.object = object;
|
|
#endif
|
|
cpipe->pipe_buffer.buffer = buffer;
|
|
cpipe->pipe_buffer.size = size;
|
|
cpipe->pipe_buffer.in = 0;
|
|
cpipe->pipe_buffer.out = 0;
|
|
cpipe->pipe_buffer.cnt = 0;
|
|
amountpipekva += cpipe->pipe_buffer.size;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* initialize and allocate VM and memory for pipe
|
|
*/
|
|
static int
|
|
pipe_create(cpipep, allockva)
|
|
struct pipe **cpipep;
|
|
int allockva;
|
|
{
|
|
struct pipe *cpipe;
|
|
int error;
|
|
|
|
#ifdef __FreeBSD__
|
|
*cpipep = zalloc(pipe_zone);
|
|
#endif
|
|
#ifdef __NetBSD__
|
|
*cpipep = pool_get(&pipe_pool, M_WAITOK);
|
|
#endif
|
|
if (*cpipep == NULL)
|
|
return (ENOMEM);
|
|
|
|
cpipe = *cpipep;
|
|
|
|
/* Initialize */
|
|
memset(cpipe, 0, sizeof(*cpipe));
|
|
cpipe->pipe_state = PIPE_SIGNALR;
|
|
|
|
#ifdef __FreeBSD__
|
|
cpipe->pipe_mtxp = NULL; /* avoid pipespace assertion */
|
|
#endif
|
|
if (allockva && (error = pipespace(cpipe, PIPE_SIZE)))
|
|
return (error);
|
|
|
|
vfs_timestamp(&cpipe->pipe_ctime);
|
|
cpipe->pipe_atime = cpipe->pipe_ctime;
|
|
cpipe->pipe_mtime = cpipe->pipe_ctime;
|
|
#ifdef __NetBSD__
|
|
cpipe->pipe_pgid = NO_PID;
|
|
lockinit(&cpipe->pipe_lock, PRIBIO | PCATCH, "pipelk", 0, 0);
|
|
#endif
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* lock a pipe for I/O, blocking other access
|
|
*/
|
|
static __inline int
|
|
pipelock(cpipe, catch)
|
|
struct pipe *cpipe;
|
|
int catch;
|
|
{
|
|
int error;
|
|
|
|
#ifdef __FreeBSD__
|
|
PIPE_LOCK_ASSERT(cpipe, MA_OWNED);
|
|
while (cpipe->pipe_state & PIPE_LOCKFL) {
|
|
cpipe->pipe_state |= PIPE_LWANT;
|
|
error = msleep(cpipe, PIPE_MTX(cpipe),
|
|
catch ? (PRIBIO | PCATCH) : PRIBIO,
|
|
"pipelk", 0);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
cpipe->pipe_state |= PIPE_LOCKFL;
|
|
return (0);
|
|
#endif
|
|
|
|
#ifdef __NetBSD__
|
|
do {
|
|
error = lockmgr(&cpipe->pipe_lock, LK_EXCLUSIVE, NULL);
|
|
} while (!catch && (error == EINTR || error == ERESTART));
|
|
return (error);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* unlock a pipe I/O lock
|
|
*/
|
|
static __inline void
|
|
pipeunlock(cpipe)
|
|
struct pipe *cpipe;
|
|
{
|
|
|
|
#ifdef __FreeBSD__
|
|
PIPE_LOCK_ASSERT(cpipe, MA_OWNED);
|
|
cpipe->pipe_state &= ~PIPE_LOCKFL;
|
|
if (cpipe->pipe_state & PIPE_LWANT) {
|
|
cpipe->pipe_state &= ~PIPE_LWANT;
|
|
wakeup(cpipe);
|
|
}
|
|
#endif
|
|
|
|
#ifdef __NetBSD__
|
|
lockmgr(&cpipe->pipe_lock, LK_RELEASE, NULL);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Select/poll wakup. This also sends SIGIO to peer connected to
|
|
* 'sigpipe' side of pipe.
|
|
*/
|
|
static __inline void
|
|
pipeselwakeup(selp, sigp)
|
|
struct pipe *selp, *sigp;
|
|
{
|
|
|
|
#ifdef __FreeBSD__
|
|
if (selp->pipe_state & PIPE_SEL) {
|
|
selp->pipe_state &= ~PIPE_SEL;
|
|
selwakeup(&selp->pipe_sel);
|
|
}
|
|
if (sigp && (sigp->pipe_state & PIPE_ASYNC) && sigp->pipe_sigio)
|
|
pgsigio(sigp->pipe_sigio, SIGIO, 0);
|
|
KNOTE(&selp->pipe_sel.sel_note, 0);
|
|
#endif
|
|
|
|
#ifdef __NetBSD__
|
|
selnotify(&selp->pipe_sel, 0);
|
|
if (sigp && (sigp->pipe_state & PIPE_ASYNC) &&
|
|
sigp->pipe_pgid != NO_PID) {
|
|
struct proc *p;
|
|
|
|
if (sigp->pipe_pgid < 0)
|
|
gsignal(-sigp->pipe_pgid, SIGIO);
|
|
else if (sigp->pipe_pgid > 0 && (p = pfind(sigp->pipe_pgid)) != 0)
|
|
psignal(p, SIGIO);
|
|
}
|
|
#endif /* NetBSD */
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
#ifdef __FreeBSD__
|
|
static int
|
|
pipe_read(fp, uio, cred, flags, td)
|
|
struct file *fp;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
int flags;
|
|
struct proc *p;
|
|
#elif defined(__NetBSD__)
|
|
static int
|
|
pipe_read(fp, offset, uio, cred, flags)
|
|
struct file *fp;
|
|
off_t *offset;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
int flags;
|
|
#endif
|
|
{
|
|
struct pipe *rpipe = (struct pipe *) fp->f_data;
|
|
int error;
|
|
size_t nread = 0;
|
|
size_t size;
|
|
size_t ocnt;
|
|
|
|
PIPE_LOCK(rpipe);
|
|
++rpipe->pipe_busy;
|
|
ocnt = rpipe->pipe_buffer.cnt;
|
|
|
|
error = pipelock(rpipe, 1);
|
|
if (error)
|
|
goto unlocked_error;
|
|
|
|
while (uio->uio_resid) {
|
|
/*
|
|
* normal pipe buffer receive
|
|
*/
|
|
if (rpipe->pipe_buffer.cnt > 0) {
|
|
size = rpipe->pipe_buffer.size - rpipe->pipe_buffer.out;
|
|
if (size > rpipe->pipe_buffer.cnt)
|
|
size = rpipe->pipe_buffer.cnt;
|
|
if (size > uio->uio_resid)
|
|
size = uio->uio_resid;
|
|
|
|
PIPE_UNLOCK(rpipe);
|
|
error = uiomove(&rpipe->pipe_buffer.buffer[rpipe->pipe_buffer.out],
|
|
size, uio);
|
|
PIPE_LOCK(rpipe);
|
|
if (error)
|
|
break;
|
|
|
|
rpipe->pipe_buffer.out += size;
|
|
if (rpipe->pipe_buffer.out >= rpipe->pipe_buffer.size)
|
|
rpipe->pipe_buffer.out = 0;
|
|
|
|
rpipe->pipe_buffer.cnt -= size;
|
|
|
|
/*
|
|
* If there is no more to read in the pipe, reset
|
|
* its pointers to the beginning. This improves
|
|
* cache hit stats.
|
|
*/
|
|
if (rpipe->pipe_buffer.cnt == 0) {
|
|
rpipe->pipe_buffer.in = 0;
|
|
rpipe->pipe_buffer.out = 0;
|
|
}
|
|
nread += size;
|
|
#ifndef PIPE_NODIRECT
|
|
/*
|
|
* Direct copy, bypassing a kernel buffer.
|
|
*/
|
|
} else if ((size = rpipe->pipe_map.cnt) &&
|
|
(rpipe->pipe_state & PIPE_DIRECTW)) {
|
|
caddr_t va;
|
|
if (size > uio->uio_resid)
|
|
size = uio->uio_resid;
|
|
|
|
va = (caddr_t) rpipe->pipe_map.kva +
|
|
rpipe->pipe_map.pos;
|
|
PIPE_UNLOCK(rpipe);
|
|
error = uiomove(va, size, uio);
|
|
PIPE_LOCK(rpipe);
|
|
if (error)
|
|
break;
|
|
nread += size;
|
|
rpipe->pipe_map.pos += size;
|
|
rpipe->pipe_map.cnt -= size;
|
|
if (rpipe->pipe_map.cnt == 0) {
|
|
rpipe->pipe_state &= ~PIPE_DIRECTW;
|
|
wakeup(rpipe);
|
|
}
|
|
#endif
|
|
} else {
|
|
/*
|
|
* detect EOF condition
|
|
* read returns 0 on EOF, no need to set error
|
|
*/
|
|
if (rpipe->pipe_state & PIPE_EOF)
|
|
break;
|
|
|
|
/*
|
|
* If the "write-side" has been blocked, wake it up now.
|
|
*/
|
|
if (rpipe->pipe_state & PIPE_WANTW) {
|
|
rpipe->pipe_state &= ~PIPE_WANTW;
|
|
wakeup(rpipe);
|
|
}
|
|
|
|
/*
|
|
* Break if some data was read.
|
|
*/
|
|
if (nread > 0)
|
|
break;
|
|
|
|
/*
|
|
* don't block on non-blocking I/O
|
|
*/
|
|
if (fp->f_flag & FNONBLOCK) {
|
|
error = EAGAIN;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Unlock the pipe buffer for our remaining processing.
|
|
* We will either break out with an error or we will
|
|
* sleep and relock to loop.
|
|
*/
|
|
pipeunlock(rpipe);
|
|
|
|
/*
|
|
* We want to read more, wake up select/poll.
|
|
*/
|
|
pipeselwakeup(rpipe, rpipe->pipe_peer);
|
|
|
|
rpipe->pipe_state |= PIPE_WANTR;
|
|
#ifdef __FreeBSD__
|
|
error = msleep(rpipe, PIPE_MTX(rpipe), PRIBIO | PCATCH,
|
|
"piperd", 0);
|
|
#else
|
|
error = tsleep(rpipe, PRIBIO | PCATCH, "piperd", 0);
|
|
#endif
|
|
if (error != 0 || (error = pipelock(rpipe, 1)))
|
|
goto unlocked_error;
|
|
}
|
|
}
|
|
pipeunlock(rpipe);
|
|
|
|
/* XXX: should probably do this before getting any locks. */
|
|
if (error == 0)
|
|
vfs_timestamp(&rpipe->pipe_atime);
|
|
unlocked_error:
|
|
--rpipe->pipe_busy;
|
|
|
|
/*
|
|
* PIPE_WANTCLOSE processing only makes sense if pipe_busy is 0.
|
|
*/
|
|
if ((rpipe->pipe_busy == 0) && (rpipe->pipe_state & PIPE_WANTCLOSE)) {
|
|
rpipe->pipe_state &= ~(PIPE_WANTCLOSE|PIPE_WANTW);
|
|
wakeup(rpipe);
|
|
} else if (rpipe->pipe_buffer.cnt < MINPIPESIZE) {
|
|
/*
|
|
* Handle write blocking hysteresis.
|
|
*/
|
|
if (rpipe->pipe_state & PIPE_WANTW) {
|
|
rpipe->pipe_state &= ~PIPE_WANTW;
|
|
wakeup(rpipe);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If anything was read off the buffer, signal to the writer it's
|
|
* possible to write more data. Also send signal if we are here for the
|
|
* first time after last write.
|
|
*/
|
|
if ((rpipe->pipe_buffer.size - rpipe->pipe_buffer.cnt) >= PIPE_BUF
|
|
&& (ocnt != rpipe->pipe_buffer.cnt || (rpipe->pipe_state & PIPE_SIGNALR))) {
|
|
pipeselwakeup(rpipe, rpipe->pipe_peer);
|
|
rpipe->pipe_state &= ~PIPE_SIGNALR;
|
|
}
|
|
|
|
PIPE_UNLOCK(rpipe);
|
|
return (error);
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
#ifndef PIPE_NODIRECT
|
|
/*
|
|
* Map the sending processes' buffer into kernel space and wire it.
|
|
* This is similar to a physical write operation.
|
|
*/
|
|
static int
|
|
pipe_build_write_buffer(wpipe, uio)
|
|
struct pipe *wpipe;
|
|
struct uio *uio;
|
|
{
|
|
size_t size;
|
|
int i;
|
|
vm_offset_t addr, endaddr, paddr;
|
|
|
|
GIANT_REQUIRED;
|
|
PIPE_LOCK_ASSERT(wpipe, MA_NOTOWNED);
|
|
|
|
size = uio->uio_iov->iov_len;
|
|
if (size > wpipe->pipe_buffer.size)
|
|
size = wpipe->pipe_buffer.size;
|
|
|
|
endaddr = round_page((vm_offset_t)uio->uio_iov->iov_base + size);
|
|
addr = trunc_page((vm_offset_t)uio->uio_iov->iov_base);
|
|
for (i = 0; addr < endaddr; addr += PAGE_SIZE, i++) {
|
|
vm_page_t m;
|
|
|
|
if (vm_fault_quick((caddr_t)addr, VM_PROT_READ) < 0 ||
|
|
(paddr = pmap_kextract(addr)) == 0) {
|
|
int j;
|
|
|
|
for (j = 0; j < i; j++)
|
|
vm_page_unwire(wpipe->pipe_map.ms[j], 1);
|
|
return (EFAULT);
|
|
}
|
|
|
|
m = PHYS_TO_VM_PAGE(paddr);
|
|
vm_page_wire(m);
|
|
wpipe->pipe_map.ms[i] = m;
|
|
}
|
|
|
|
/*
|
|
* set up the control block
|
|
*/
|
|
wpipe->pipe_map.npages = i;
|
|
wpipe->pipe_map.pos =
|
|
((vm_offset_t) uio->uio_iov->iov_base) & PAGE_MASK;
|
|
wpipe->pipe_map.cnt = size;
|
|
|
|
/*
|
|
* and map the buffer
|
|
*/
|
|
if (wpipe->pipe_map.kva == 0) {
|
|
/*
|
|
* We need to allocate space for an extra page because the
|
|
* address range might (will) span pages at times.
|
|
*/
|
|
wpipe->pipe_map.kva = kmem_alloc_pageable(kernel_map,
|
|
wpipe->pipe_buffer.size + PAGE_SIZE);
|
|
amountpipekva += wpipe->pipe_buffer.size + PAGE_SIZE;
|
|
}
|
|
pmap_qenter(wpipe->pipe_map.kva, wpipe->pipe_map.ms,
|
|
wpipe->pipe_map.npages);
|
|
|
|
/*
|
|
* and update the uio data
|
|
*/
|
|
|
|
uio->uio_iov->iov_len -= size;
|
|
uio->uio_iov->iov_base += size;
|
|
if (uio->uio_iov->iov_len == 0)
|
|
uio->uio_iov++;
|
|
uio->uio_resid -= size;
|
|
uio->uio_offset += size;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* unmap and unwire the process buffer
|
|
*/
|
|
static void
|
|
pipe_destroy_write_buffer(wpipe)
|
|
struct pipe *wpipe;
|
|
{
|
|
int i;
|
|
|
|
GIANT_REQUIRED;
|
|
PIPE_LOCK_ASSERT(wpipe, MA_NOTOWNED);
|
|
|
|
if (wpipe->pipe_map.kva) {
|
|
pmap_qremove(wpipe->pipe_map.kva, wpipe->pipe_map.npages);
|
|
|
|
if (amountpipekva > maxpipekva) {
|
|
vm_offset_t kva = wpipe->pipe_map.kva;
|
|
wpipe->pipe_map.kva = 0;
|
|
kmem_free(kernel_map, kva,
|
|
wpipe->pipe_buffer.size + PAGE_SIZE);
|
|
amountpipekva -= wpipe->pipe_buffer.size + PAGE_SIZE;
|
|
}
|
|
}
|
|
for (i = 0; i < wpipe->pipe_map.npages; i++)
|
|
vm_page_unwire(wpipe->pipe_map.ms[i], 1);
|
|
wpipe->pipe_map.npages = 0;
|
|
}
|
|
|
|
/*
|
|
* In the case of a signal, the writing process might go away. This
|
|
* code copies the data into the circular buffer so that the source
|
|
* pages can be freed without loss of data.
|
|
*/
|
|
static void
|
|
pipe_clone_write_buffer(wpipe)
|
|
struct pipe *wpipe;
|
|
{
|
|
int size;
|
|
int pos;
|
|
|
|
PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
|
|
size = wpipe->pipe_map.cnt;
|
|
pos = wpipe->pipe_map.pos;
|
|
memcpy((caddr_t) wpipe->pipe_buffer.buffer,
|
|
(caddr_t) wpipe->pipe_map.kva + pos, size);
|
|
|
|
wpipe->pipe_buffer.in = size;
|
|
wpipe->pipe_buffer.out = 0;
|
|
wpipe->pipe_buffer.cnt = size;
|
|
wpipe->pipe_state &= ~PIPE_DIRECTW;
|
|
|
|
PIPE_GET_GIANT(wpipe);
|
|
pipe_destroy_write_buffer(wpipe);
|
|
PIPE_DROP_GIANT(wpipe);
|
|
}
|
|
|
|
/*
|
|
* This implements the pipe buffer write mechanism. Note that only
|
|
* a direct write OR a normal pipe write can be pending at any given time.
|
|
* If there are any characters in the pipe buffer, the direct write will
|
|
* be deferred until the receiving process grabs all of the bytes from
|
|
* the pipe buffer. Then the direct mapping write is set-up.
|
|
*/
|
|
static int
|
|
pipe_direct_write(wpipe, uio)
|
|
struct pipe *wpipe;
|
|
struct uio *uio;
|
|
{
|
|
int error;
|
|
|
|
retry:
|
|
PIPE_LOCK_ASSERT(wpipe, MA_OWNED);
|
|
while (wpipe->pipe_state & PIPE_DIRECTW) {
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
wpipe->pipe_state |= PIPE_WANTW;
|
|
error = msleep(wpipe, PIPE_MTX(wpipe),
|
|
PRIBIO | PCATCH, "pipdww", 0);
|
|
if (error)
|
|
goto error1;
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
goto error1;
|
|
}
|
|
}
|
|
wpipe->pipe_map.cnt = 0; /* transfer not ready yet */
|
|
if (wpipe->pipe_buffer.cnt > 0) {
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
|
|
wpipe->pipe_state |= PIPE_WANTW;
|
|
error = msleep(wpipe, PIPE_MTX(wpipe),
|
|
PRIBIO | PCATCH, "pipdwc", 0);
|
|
if (error)
|
|
goto error1;
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
goto error1;
|
|
}
|
|
goto retry;
|
|
}
|
|
|
|
wpipe->pipe_state |= PIPE_DIRECTW;
|
|
|
|
PIPE_GET_GIANT(wpipe);
|
|
error = pipe_build_write_buffer(wpipe, uio);
|
|
PIPE_DROP_GIANT(wpipe);
|
|
if (error) {
|
|
wpipe->pipe_state &= ~PIPE_DIRECTW;
|
|
goto error1;
|
|
}
|
|
|
|
error = 0;
|
|
while (!error && (wpipe->pipe_state & PIPE_DIRECTW)) {
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
pipelock(wpipe, 0);
|
|
PIPE_GET_GIANT(wpipe);
|
|
pipe_destroy_write_buffer(wpipe);
|
|
PIPE_DROP_GIANT(wpipe);
|
|
pipeunlock(wpipe);
|
|
pipeselwakeup(wpipe, wpipe);
|
|
error = EPIPE;
|
|
goto error1;
|
|
}
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
pipeselwakeup(wpipe, wpipe);
|
|
error = msleep(wpipe, PIPE_MTX(wpipe), PRIBIO | PCATCH,
|
|
"pipdwt", 0);
|
|
}
|
|
|
|
pipelock(wpipe,0);
|
|
if (wpipe->pipe_state & PIPE_DIRECTW) {
|
|
/*
|
|
* this bit of trickery substitutes a kernel buffer for
|
|
* the process that might be going away.
|
|
*/
|
|
pipe_clone_write_buffer(wpipe);
|
|
} else {
|
|
PIPE_GET_GIANT(wpipe);
|
|
pipe_destroy_write_buffer(wpipe);
|
|
PIPE_DROP_GIANT(wpipe);
|
|
}
|
|
pipeunlock(wpipe);
|
|
return (error);
|
|
|
|
error1:
|
|
wakeup(wpipe);
|
|
return (error);
|
|
}
|
|
#endif /* !PIPE_NODIRECT */
|
|
#endif /* FreeBSD */
|
|
|
|
#ifdef __NetBSD__
|
|
#ifndef PIPE_NODIRECT
|
|
/*
|
|
* Allocate structure for loan transfer.
|
|
*/
|
|
static int
|
|
pipe_loan_alloc(wpipe, npages)
|
|
struct pipe *wpipe;
|
|
int npages;
|
|
{
|
|
vsize_t len;
|
|
|
|
len = (vsize_t)npages << PAGE_SHIFT;
|
|
wpipe->pipe_map.kva = uvm_km_valloc_wait(kernel_map, len);
|
|
if (wpipe->pipe_map.kva == 0)
|
|
return (ENOMEM);
|
|
|
|
amountpipekva += len;
|
|
wpipe->pipe_map.npages = npages;
|
|
wpipe->pipe_map.pgs = malloc(npages * sizeof(struct vm_page *), M_PIPE,
|
|
M_WAITOK);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free resources allocated for loan transfer.
|
|
*/
|
|
static void
|
|
pipe_loan_free(wpipe)
|
|
struct pipe *wpipe;
|
|
{
|
|
vsize_t len;
|
|
|
|
len = (vsize_t)wpipe->pipe_map.npages << PAGE_SHIFT;
|
|
uvm_km_free(kernel_map, wpipe->pipe_map.kva, len);
|
|
wpipe->pipe_map.kva = 0;
|
|
amountpipekva -= len;
|
|
free(wpipe->pipe_map.pgs, M_PIPE);
|
|
wpipe->pipe_map.pgs = NULL;
|
|
}
|
|
|
|
/*
|
|
* NetBSD direct write, using uvm_loan() mechanism.
|
|
* This implements the pipe buffer write mechanism. Note that only
|
|
* a direct write OR a normal pipe write can be pending at any given time.
|
|
* If there are any characters in the pipe buffer, the direct write will
|
|
* be deferred until the receiving process grabs all of the bytes from
|
|
* the pipe buffer. Then the direct mapping write is set-up.
|
|
*/
|
|
static int
|
|
pipe_direct_write(wpipe, uio)
|
|
struct pipe *wpipe;
|
|
struct uio *uio;
|
|
{
|
|
int error, npages, j;
|
|
struct vm_page **pgs;
|
|
vaddr_t bbase, kva, base, bend;
|
|
vsize_t blen, bcnt;
|
|
voff_t bpos;
|
|
|
|
retry:
|
|
while (wpipe->pipe_state & PIPE_DIRECTW) {
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
wpipe->pipe_state |= PIPE_WANTW;
|
|
error = tsleep(wpipe, PRIBIO | PCATCH, "pipdww", 0);
|
|
if (error)
|
|
goto error;
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
goto error;
|
|
}
|
|
}
|
|
wpipe->pipe_map.cnt = 0; /* transfer not ready yet */
|
|
if (wpipe->pipe_buffer.cnt > 0) {
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
|
|
wpipe->pipe_state |= PIPE_WANTW;
|
|
error = tsleep(wpipe, PRIBIO | PCATCH, "pipdwc", 0);
|
|
if (error)
|
|
goto error;
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
goto error;
|
|
}
|
|
goto retry;
|
|
}
|
|
|
|
/*
|
|
* Handle first PIPE_CHUNK_SIZE bytes of buffer. Deal with buffers
|
|
* not aligned to PAGE_SIZE.
|
|
*/
|
|
bbase = (vaddr_t)uio->uio_iov->iov_base;
|
|
base = trunc_page(bbase);
|
|
bend = round_page(bbase + uio->uio_iov->iov_len);
|
|
blen = bend - base;
|
|
bpos = bbase - base;
|
|
|
|
if (blen > PIPE_DIRECT_CHUNK) {
|
|
blen = PIPE_DIRECT_CHUNK;
|
|
bend = base + blen;
|
|
bcnt = PIPE_DIRECT_CHUNK - bpos;
|
|
} else {
|
|
bcnt = uio->uio_iov->iov_len;
|
|
}
|
|
npages = blen >> PAGE_SHIFT;
|
|
|
|
wpipe->pipe_map.pos = bpos;
|
|
wpipe->pipe_map.cnt = bcnt;
|
|
|
|
/*
|
|
* Free the old kva if we need more pages than we have
|
|
* allocated.
|
|
*/
|
|
if (wpipe->pipe_map.kva && npages > wpipe->pipe_map.npages)
|
|
pipe_loan_free(wpipe);
|
|
|
|
/* Allocate new kva. */
|
|
if (wpipe->pipe_map.kva == 0) {
|
|
error = pipe_loan_alloc(wpipe, npages);
|
|
if (error) {
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Loan the write buffer memory from writer process */
|
|
pgs = wpipe->pipe_map.pgs;
|
|
error = uvm_loan(&uio->uio_procp->p_vmspace->vm_map, base, blen,
|
|
pgs, UVM_LOAN_TOPAGE);
|
|
if (error) {
|
|
pgs = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Enter the loaned pages to kva */
|
|
kva = wpipe->pipe_map.kva;
|
|
for (j = 0; j < npages; j++, kva += PAGE_SIZE) {
|
|
pmap_kenter_pa(kva, VM_PAGE_TO_PHYS(pgs[j]), VM_PROT_READ);
|
|
}
|
|
pmap_update(pmap_kernel());
|
|
|
|
wpipe->pipe_state |= PIPE_DIRECTW;
|
|
while (!error && (wpipe->pipe_state & PIPE_DIRECTW)) {
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
break;
|
|
}
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
pipeselwakeup(wpipe, wpipe);
|
|
error = tsleep(wpipe, PRIBIO | PCATCH, "pipdwt", 0);
|
|
}
|
|
|
|
if (error)
|
|
wpipe->pipe_state &= ~PIPE_DIRECTW;
|
|
|
|
cleanup:
|
|
pipelock(wpipe, 0);
|
|
if (pgs != NULL) {
|
|
pmap_kremove(wpipe->pipe_map.kva, blen);
|
|
uvm_unloan(pgs, npages, UVM_LOAN_TOPAGE);
|
|
}
|
|
if (error || amountpipekva > maxpipekva)
|
|
pipe_loan_free(wpipe);
|
|
pipeunlock(wpipe);
|
|
|
|
if (error) {
|
|
pipeselwakeup(wpipe, wpipe);
|
|
|
|
/*
|
|
* If nothing was read from what we offered, return error
|
|
* straight on. Otherwise update uio resid first. Caller
|
|
* will deal with the error condition, returning short
|
|
* write, error, or restarting the write(2) as appropriate.
|
|
*/
|
|
if (wpipe->pipe_map.cnt == bcnt) {
|
|
error:
|
|
wakeup(wpipe);
|
|
return (error);
|
|
}
|
|
|
|
bcnt -= wpipe->pipe_map.cnt;
|
|
}
|
|
|
|
uio->uio_resid -= bcnt;
|
|
/* uio_offset not updated, not set/used for write(2) */
|
|
uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + bcnt;
|
|
uio->uio_iov->iov_len -= bcnt;
|
|
if (uio->uio_iov->iov_len == 0) {
|
|
uio->uio_iov++;
|
|
uio->uio_iovcnt--;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#endif /* !PIPE_NODIRECT */
|
|
#endif /* NetBSD */
|
|
|
|
#ifdef __FreeBSD__
|
|
static int
|
|
pipe_write(fp, uio, cred, flags, td)
|
|
struct file *fp;
|
|
off_t *offset;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
int flags;
|
|
struct thread *td;
|
|
#elif defined(__NetBSD__)
|
|
static int
|
|
pipe_write(fp, offset, uio, cred, flags)
|
|
struct file *fp;
|
|
off_t *offset;
|
|
struct uio *uio;
|
|
struct ucred *cred;
|
|
int flags;
|
|
#endif
|
|
{
|
|
int error = 0;
|
|
struct pipe *wpipe, *rpipe;
|
|
|
|
rpipe = (struct pipe *) fp->f_data;
|
|
wpipe = rpipe->pipe_peer;
|
|
|
|
PIPE_LOCK(rpipe);
|
|
/*
|
|
* detect loss of pipe read side, issue SIGPIPE if lost.
|
|
*/
|
|
if ((wpipe == NULL) || (wpipe->pipe_state & PIPE_EOF)) {
|
|
PIPE_UNLOCK(rpipe);
|
|
return (EPIPE);
|
|
}
|
|
|
|
++wpipe->pipe_busy;
|
|
|
|
/*
|
|
* If it is advantageous to resize the pipe buffer, do
|
|
* so.
|
|
*/
|
|
if ((uio->uio_resid > PIPE_SIZE) &&
|
|
(nbigpipe < maxbigpipes) &&
|
|
#ifndef PIPE_NODIRECT
|
|
(wpipe->pipe_state & PIPE_DIRECTW) == 0 &&
|
|
#endif
|
|
(wpipe->pipe_buffer.size <= PIPE_SIZE) &&
|
|
(wpipe->pipe_buffer.cnt == 0)) {
|
|
|
|
if ((error = pipelock(wpipe,1)) == 0) {
|
|
PIPE_GET_GIANT(rpipe);
|
|
if (pipespace(wpipe, BIG_PIPE_SIZE) == 0)
|
|
nbigpipe++;
|
|
PIPE_DROP_GIANT(rpipe);
|
|
pipeunlock(wpipe);
|
|
} else {
|
|
/*
|
|
* If an error occurred, unbusy and return, waking up
|
|
* any waiting readers.
|
|
*/
|
|
--wpipe->pipe_busy;
|
|
if (wpipe->pipe_busy == 0
|
|
&& (wpipe->pipe_state & PIPE_WANTCLOSE)) {
|
|
wpipe->pipe_state &=
|
|
~(PIPE_WANTCLOSE | PIPE_WANTR);
|
|
wakeup(wpipe);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
/*
|
|
* If an early error occured unbusy and return, waking up any pending
|
|
* readers.
|
|
*/
|
|
if (error) {
|
|
--wpipe->pipe_busy;
|
|
if ((wpipe->pipe_busy == 0) &&
|
|
(wpipe->pipe_state & PIPE_WANT)) {
|
|
wpipe->pipe_state &= ~(PIPE_WANT | PIPE_WANTR);
|
|
wakeup(wpipe);
|
|
}
|
|
PIPE_UNLOCK(rpipe);
|
|
return(error);
|
|
}
|
|
|
|
KASSERT(wpipe->pipe_buffer.buffer != NULL, ("pipe buffer gone"));
|
|
#endif
|
|
|
|
while (uio->uio_resid) {
|
|
size_t space;
|
|
|
|
#ifndef PIPE_NODIRECT
|
|
/*
|
|
* If the transfer is large, we can gain performance if
|
|
* we do process-to-process copies directly.
|
|
* If the write is non-blocking, we don't use the
|
|
* direct write mechanism.
|
|
*
|
|
* The direct write mechanism will detect the reader going
|
|
* away on us.
|
|
*/
|
|
if ((uio->uio_iov->iov_len >= PIPE_MINDIRECT) &&
|
|
(fp->f_flag & FNONBLOCK) == 0 &&
|
|
(wpipe->pipe_map.kva || (amountpipekva < limitpipekva))) {
|
|
error = pipe_direct_write(wpipe, uio);
|
|
|
|
/*
|
|
* Break out if error occured, unless it's ENOMEM.
|
|
* ENOMEM means we failed to allocate some resources
|
|
* for direct write, so we just fallback to ordinary
|
|
* write. If the direct write was successful,
|
|
* process rest of data via ordinary write.
|
|
*/
|
|
if (!error)
|
|
continue;
|
|
|
|
if (error != ENOMEM)
|
|
break;
|
|
}
|
|
#endif /* PIPE_NODIRECT */
|
|
|
|
/*
|
|
* Pipe buffered writes cannot be coincidental with
|
|
* direct writes. We wait until the currently executing
|
|
* direct write is completed before we start filling the
|
|
* pipe buffer. We break out if a signal occurs or the
|
|
* reader goes away.
|
|
*/
|
|
retrywrite:
|
|
while (wpipe->pipe_state & PIPE_DIRECTW) {
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
#ifdef __FreeBSD__
|
|
error = msleep(wpipe, PIPE_MTX(rpipe), PRIBIO | PCATCH,
|
|
"pipbww", 0);
|
|
#else
|
|
error = tsleep(wpipe, PRIBIO | PCATCH, "pipbww", 0);
|
|
#endif
|
|
if (wpipe->pipe_state & PIPE_EOF)
|
|
break;
|
|
if (error)
|
|
break;
|
|
}
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
break;
|
|
}
|
|
|
|
space = wpipe->pipe_buffer.size - wpipe->pipe_buffer.cnt;
|
|
|
|
/* Writes of size <= PIPE_BUF must be atomic. */
|
|
if ((space < uio->uio_resid) && (uio->uio_resid <= PIPE_BUF))
|
|
space = 0;
|
|
|
|
if (space > 0) {
|
|
int size; /* Transfer size */
|
|
int segsize; /* first segment to transfer */
|
|
|
|
if ((error = pipelock(wpipe,1)) != 0)
|
|
break;
|
|
|
|
/*
|
|
* It is possible for a direct write to
|
|
* slip in on us... handle it here...
|
|
*/
|
|
if (wpipe->pipe_state & PIPE_DIRECTW) {
|
|
pipeunlock(wpipe);
|
|
goto retrywrite;
|
|
}
|
|
/*
|
|
* If a process blocked in uiomove, our
|
|
* value for space might be bad.
|
|
*
|
|
* XXX will we be ok if the reader has gone
|
|
* away here?
|
|
*/
|
|
if (space > wpipe->pipe_buffer.size -
|
|
wpipe->pipe_buffer.cnt) {
|
|
pipeunlock(wpipe);
|
|
goto retrywrite;
|
|
}
|
|
|
|
/*
|
|
* Transfer size is minimum of uio transfer
|
|
* and free space in pipe buffer.
|
|
*/
|
|
if (space > uio->uio_resid)
|
|
size = uio->uio_resid;
|
|
else
|
|
size = space;
|
|
/*
|
|
* First segment to transfer is minimum of
|
|
* transfer size and contiguous space in
|
|
* pipe buffer. If first segment to transfer
|
|
* is less than the transfer size, we've got
|
|
* a wraparound in the buffer.
|
|
*/
|
|
segsize = wpipe->pipe_buffer.size -
|
|
wpipe->pipe_buffer.in;
|
|
if (segsize > size)
|
|
segsize = size;
|
|
|
|
/* Transfer first segment */
|
|
|
|
PIPE_UNLOCK(rpipe);
|
|
error = uiomove(&wpipe->pipe_buffer.buffer[wpipe->pipe_buffer.in],
|
|
segsize, uio);
|
|
PIPE_LOCK(rpipe);
|
|
|
|
if (error == 0 && segsize < size) {
|
|
/*
|
|
* Transfer remaining part now, to
|
|
* support atomic writes. Wraparound
|
|
* happened.
|
|
*/
|
|
#ifdef DEBUG
|
|
if (wpipe->pipe_buffer.in + segsize !=
|
|
wpipe->pipe_buffer.size)
|
|
panic("Expected pipe buffer wraparound disappeared");
|
|
#endif
|
|
|
|
PIPE_UNLOCK(rpipe);
|
|
error = uiomove(&wpipe->pipe_buffer.buffer[0],
|
|
size - segsize, uio);
|
|
PIPE_LOCK(rpipe);
|
|
}
|
|
if (error == 0) {
|
|
wpipe->pipe_buffer.in += size;
|
|
if (wpipe->pipe_buffer.in >=
|
|
wpipe->pipe_buffer.size) {
|
|
#ifdef DEBUG
|
|
if (wpipe->pipe_buffer.in != size - segsize + wpipe->pipe_buffer.size)
|
|
panic("Expected wraparound bad");
|
|
#endif
|
|
wpipe->pipe_buffer.in = size - segsize;
|
|
}
|
|
|
|
wpipe->pipe_buffer.cnt += size;
|
|
#ifdef DEBUG
|
|
if (wpipe->pipe_buffer.cnt > wpipe->pipe_buffer.size)
|
|
panic("Pipe buffer overflow");
|
|
#endif
|
|
}
|
|
pipeunlock(wpipe);
|
|
if (error)
|
|
break;
|
|
} else {
|
|
/*
|
|
* If the "read-side" has been blocked, wake it up now.
|
|
*/
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
|
|
/*
|
|
* don't block on non-blocking I/O
|
|
*/
|
|
if (fp->f_flag & FNONBLOCK) {
|
|
error = EAGAIN;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We have no more space and have something to offer,
|
|
* wake up select/poll.
|
|
*/
|
|
pipeselwakeup(wpipe, wpipe);
|
|
|
|
wpipe->pipe_state |= PIPE_WANTW;
|
|
#ifdef __FreeBSD__
|
|
error = msleep(wpipe, PIPE_MTX(rpipe),
|
|
PRIBIO | PCATCH, "pipewr", 0);
|
|
#else
|
|
error = tsleep(wpipe, PRIBIO | PCATCH, "pipewr", 0);
|
|
#endif
|
|
if (error != 0)
|
|
break;
|
|
/*
|
|
* If read side wants to go away, we just issue a signal
|
|
* to ourselves.
|
|
*/
|
|
if (wpipe->pipe_state & PIPE_EOF) {
|
|
error = EPIPE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
--wpipe->pipe_busy;
|
|
if ((wpipe->pipe_busy == 0) && (wpipe->pipe_state & PIPE_WANTCLOSE)) {
|
|
wpipe->pipe_state &= ~(PIPE_WANTCLOSE | PIPE_WANTR);
|
|
wakeup(wpipe);
|
|
} else if (wpipe->pipe_buffer.cnt > 0) {
|
|
/*
|
|
* If we have put any characters in the buffer, we wake up
|
|
* the reader.
|
|
*/
|
|
if (wpipe->pipe_state & PIPE_WANTR) {
|
|
wpipe->pipe_state &= ~PIPE_WANTR;
|
|
wakeup(wpipe);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Don't return EPIPE if I/O was successful
|
|
*/
|
|
if ((error == EPIPE) && (wpipe->pipe_buffer.cnt == 0)
|
|
&& (uio->uio_resid == 0))
|
|
error = 0;
|
|
|
|
if (error == 0)
|
|
vfs_timestamp(&wpipe->pipe_mtime);
|
|
|
|
/*
|
|
* We have something to offer, wake up select/poll.
|
|
* wpipe->pipe_map.cnt is always 0 in this point (direct write
|
|
* is only done synchronously), so check only wpipe->pipe_buffer.cnt
|
|
*/
|
|
if (wpipe->pipe_buffer.cnt)
|
|
pipeselwakeup(wpipe, wpipe);
|
|
|
|
/*
|
|
* Arrange for next read(2) to do a signal.
|
|
*/
|
|
wpipe->pipe_state |= PIPE_SIGNALR;
|
|
|
|
PIPE_UNLOCK(rpipe);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* we implement a very minimal set of ioctls for compatibility with sockets.
|
|
*/
|
|
int
|
|
#ifdef __FreeBSD__
|
|
pipe_ioctl(fp, cmd, data, td)
|
|
struct file *fp;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
struct thread *td;
|
|
#else
|
|
pipe_ioctl(fp, cmd, data, p)
|
|
struct file *fp;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
struct proc *p;
|
|
#endif
|
|
{
|
|
struct pipe *mpipe = (struct pipe *)fp->f_data;
|
|
|
|
switch (cmd) {
|
|
|
|
case FIONBIO:
|
|
return (0);
|
|
|
|
case FIOASYNC:
|
|
PIPE_LOCK(mpipe);
|
|
if (*(int *)data) {
|
|
mpipe->pipe_state |= PIPE_ASYNC;
|
|
} else {
|
|
mpipe->pipe_state &= ~PIPE_ASYNC;
|
|
}
|
|
PIPE_UNLOCK(mpipe);
|
|
return (0);
|
|
|
|
case FIONREAD:
|
|
PIPE_LOCK(mpipe);
|
|
#ifndef PIPE_NODIRECT
|
|
if (mpipe->pipe_state & PIPE_DIRECTW)
|
|
*(int *)data = mpipe->pipe_map.cnt;
|
|
else
|
|
#endif
|
|
*(int *)data = mpipe->pipe_buffer.cnt;
|
|
PIPE_UNLOCK(mpipe);
|
|
return (0);
|
|
|
|
#ifdef __FreeBSD__
|
|
case FIOSETOWN:
|
|
return (fsetown(*(int *)data, &mpipe->pipe_sigio));
|
|
|
|
case FIOGETOWN:
|
|
*(int *)data = fgetown(mpipe->pipe_sigio);
|
|
return (0);
|
|
|
|
/* This is deprecated, FIOSETOWN should be used instead. */
|
|
case TIOCSPGRP:
|
|
return (fsetown(-(*(int *)data), &mpipe->pipe_sigio));
|
|
|
|
/* This is deprecated, FIOGETOWN should be used instead. */
|
|
case TIOCGPGRP:
|
|
*(int *)data = -fgetown(mpipe->pipe_sigio);
|
|
return (0);
|
|
#endif /* FreeBSD */
|
|
#ifdef __NetBSD__
|
|
case TIOCSPGRP:
|
|
mpipe->pipe_pgid = *(int *)data;
|
|
return (0);
|
|
|
|
case TIOCGPGRP:
|
|
*(int *)data = mpipe->pipe_pgid;
|
|
return (0);
|
|
#endif /* NetBSD */
|
|
|
|
}
|
|
return (EPASSTHROUGH);
|
|
}
|
|
|
|
int
|
|
#ifdef __FreeBSD__
|
|
pipe_poll(fp, events, cred, td)
|
|
struct file *fp;
|
|
int events;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
#elif defined(__NetBSD__)
|
|
pipe_poll(fp, events, td)
|
|
struct file *fp;
|
|
int events;
|
|
struct proc *td;
|
|
#endif
|
|
{
|
|
struct pipe *rpipe = (struct pipe *)fp->f_data;
|
|
struct pipe *wpipe;
|
|
int revents = 0;
|
|
|
|
wpipe = rpipe->pipe_peer;
|
|
PIPE_LOCK(rpipe);
|
|
if (events & (POLLIN | POLLRDNORM))
|
|
if ((rpipe->pipe_buffer.cnt > 0) ||
|
|
#ifndef PIPE_NODIRECT
|
|
(rpipe->pipe_state & PIPE_DIRECTW) ||
|
|
#endif
|
|
(rpipe->pipe_state & PIPE_EOF))
|
|
revents |= events & (POLLIN | POLLRDNORM);
|
|
|
|
if (events & (POLLOUT | POLLWRNORM))
|
|
if (wpipe == NULL || (wpipe->pipe_state & PIPE_EOF)
|
|
|| (
|
|
#ifndef PIPE_NODIRECT
|
|
((wpipe->pipe_state & PIPE_DIRECTW) == 0) &&
|
|
#endif
|
|
(wpipe->pipe_buffer.size - wpipe->pipe_buffer.cnt) >= PIPE_BUF))
|
|
revents |= events & (POLLOUT | POLLWRNORM);
|
|
|
|
if ((rpipe->pipe_state & PIPE_EOF) ||
|
|
(wpipe == NULL) ||
|
|
(wpipe->pipe_state & PIPE_EOF))
|
|
revents |= POLLHUP;
|
|
|
|
if (revents == 0) {
|
|
if (events & (POLLIN | POLLRDNORM)) {
|
|
selrecord(td, &rpipe->pipe_sel);
|
|
rpipe->pipe_state |= PIPE_SEL;
|
|
}
|
|
|
|
if (events & (POLLOUT | POLLWRNORM)) {
|
|
selrecord(td, &wpipe->pipe_sel);
|
|
wpipe->pipe_state |= PIPE_SEL;
|
|
}
|
|
}
|
|
PIPE_UNLOCK(rpipe);
|
|
|
|
return (revents);
|
|
}
|
|
|
|
static int
|
|
#ifdef __FreeBSD__
|
|
pipe_stat(fp, ub, td)
|
|
struct file *fp;
|
|
struct stat *ub;
|
|
struct thread *td;
|
|
#else
|
|
pipe_stat(fp, ub, td)
|
|
struct file *fp;
|
|
struct stat *ub;
|
|
struct proc *td;
|
|
#endif
|
|
{
|
|
struct pipe *pipe = (struct pipe *)fp->f_data;
|
|
|
|
memset((caddr_t)ub, 0, sizeof(*ub));
|
|
ub->st_mode = S_IFIFO | S_IRUSR | S_IWUSR;
|
|
ub->st_blksize = pipe->pipe_buffer.size;
|
|
ub->st_size = pipe->pipe_buffer.cnt;
|
|
ub->st_blocks = (ub->st_size) ? 1 : 0;
|
|
#ifdef __FreeBSD__
|
|
ub->st_atimespec = pipe->pipe_atime;
|
|
ub->st_mtimespec = pipe->pipe_mtime;
|
|
ub->st_ctimespec = pipe->pipe_ctime;
|
|
#endif /* FreeBSD */
|
|
#ifdef __NetBSD__
|
|
TIMEVAL_TO_TIMESPEC(&pipe->pipe_atime, &ub->st_atimespec)
|
|
TIMEVAL_TO_TIMESPEC(&pipe->pipe_mtime, &ub->st_mtimespec);
|
|
TIMEVAL_TO_TIMESPEC(&pipe->pipe_ctime, &ub->st_ctimespec);
|
|
#endif /* NetBSD */
|
|
ub->st_uid = fp->f_cred->cr_uid;
|
|
ub->st_gid = fp->f_cred->cr_gid;
|
|
/*
|
|
* Left as 0: st_dev, st_ino, st_nlink, st_rdev, st_flags, st_gen.
|
|
* XXX (st_dev, st_ino) should be unique.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
#ifdef __FreeBSD__
|
|
pipe_close(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
#else
|
|
pipe_close(fp, td)
|
|
struct file *fp;
|
|
struct proc *td;
|
|
#endif
|
|
{
|
|
struct pipe *cpipe = (struct pipe *)fp->f_data;
|
|
|
|
#ifdef __FreeBSD__
|
|
fp->f_ops = &badfileops;
|
|
funsetown(cpipe->pipe_sigio);
|
|
#endif
|
|
fp->f_data = NULL;
|
|
pipeclose(cpipe);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
pipe_free_kmem(cpipe)
|
|
struct pipe *cpipe;
|
|
{
|
|
|
|
#ifdef __FreeBSD__
|
|
|
|
GIANT_REQUIRED;
|
|
KASSERT(cpipe->pipe_mtxp == NULL || !mtx_owned(PIPE_MTX(cpipe)),
|
|
("pipespace: pipe mutex locked"));
|
|
#endif
|
|
|
|
if (cpipe->pipe_buffer.buffer != NULL) {
|
|
if (cpipe->pipe_buffer.size > PIPE_SIZE)
|
|
--nbigpipe;
|
|
amountpipekva -= cpipe->pipe_buffer.size;
|
|
#ifdef __FreeBSD__
|
|
kmem_free(kernel_map,
|
|
(vm_offset_t)cpipe->pipe_buffer.buffer,
|
|
cpipe->pipe_buffer.size);
|
|
#elif defined(__NetBSD__)
|
|
uvm_km_free(kernel_map,
|
|
(vaddr_t)cpipe->pipe_buffer.buffer,
|
|
cpipe->pipe_buffer.size);
|
|
#endif /* NetBSD */
|
|
cpipe->pipe_buffer.buffer = NULL;
|
|
}
|
|
#ifndef PIPE_NODIRECT
|
|
if (cpipe->pipe_map.kva != 0) {
|
|
#ifdef __FreeBSD__
|
|
amountpipekva -= cpipe->pipe_buffer.size + PAGE_SIZE;
|
|
kmem_free(kernel_map,
|
|
cpipe->pipe_map.kva,
|
|
cpipe->pipe_buffer.size + PAGE_SIZE);
|
|
#elif defined(__NetBSD__)
|
|
pipe_loan_free(cpipe);
|
|
#endif /* NetBSD */
|
|
cpipe->pipe_map.cnt = 0;
|
|
cpipe->pipe_map.kva = 0;
|
|
cpipe->pipe_map.pos = 0;
|
|
cpipe->pipe_map.npages = 0;
|
|
}
|
|
#endif /* !PIPE_NODIRECT */
|
|
}
|
|
|
|
/*
|
|
* shutdown the pipe
|
|
*/
|
|
static void
|
|
pipeclose(cpipe)
|
|
struct pipe *cpipe;
|
|
{
|
|
struct pipe *ppipe;
|
|
#ifdef __FreeBSD__
|
|
int hadpeer = 0;
|
|
#endif
|
|
|
|
if (cpipe == NULL)
|
|
return;
|
|
|
|
/* partially created pipes won't have a valid mutex. */
|
|
if (PIPE_MTX(cpipe) != NULL)
|
|
PIPE_LOCK(cpipe);
|
|
|
|
pipeselwakeup(cpipe, cpipe);
|
|
|
|
/*
|
|
* If the other side is blocked, wake it up saying that
|
|
* we want to close it down.
|
|
*/
|
|
while (cpipe->pipe_busy) {
|
|
wakeup(cpipe);
|
|
cpipe->pipe_state |= PIPE_WANTCLOSE | PIPE_EOF;
|
|
#ifdef __FreeBSD__
|
|
msleep(cpipe, PIPE_MTX(cpipe), PRIBIO, "pipecl", 0);
|
|
#else
|
|
tsleep(cpipe, PRIBIO, "pipecl", 0);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Disconnect from peer
|
|
*/
|
|
if ((ppipe = cpipe->pipe_peer) != NULL) {
|
|
#ifdef __FreeBSD__
|
|
hadpeer++;
|
|
#endif
|
|
pipeselwakeup(ppipe, ppipe);
|
|
|
|
ppipe->pipe_state |= PIPE_EOF;
|
|
wakeup(ppipe);
|
|
#ifdef __FreeBSD__
|
|
KNOTE(&ppipe->pipe_sel.sel_note, 0);
|
|
#endif
|
|
ppipe->pipe_peer = NULL;
|
|
}
|
|
/*
|
|
* free resources
|
|
*/
|
|
#ifdef __FreeBSD__
|
|
if (PIPE_MTX(cpipe) != NULL) {
|
|
PIPE_UNLOCK(cpipe);
|
|
if (!hadpeer) {
|
|
mtx_destroy(PIPE_MTX(cpipe));
|
|
free(PIPE_MTX(cpipe), M_TEMP);
|
|
}
|
|
}
|
|
mtx_lock(&Giant);
|
|
pipe_free_kmem(cpipe);
|
|
zfree(pipe_zone, cpipe);
|
|
mtx_unlock(&Giant);
|
|
#endif
|
|
|
|
#ifdef __NetBSD__
|
|
if (PIPE_MTX(cpipe) != NULL)
|
|
PIPE_UNLOCK(cpipe);
|
|
|
|
pipe_free_kmem(cpipe);
|
|
(void) lockmgr(&cpipe->pipe_lock, LK_DRAIN, NULL);
|
|
pool_put(&pipe_pool, cpipe);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
filt_pipedetach(struct knote *kn)
|
|
{
|
|
struct pipe *cpipe = (struct pipe *)kn->kn_fp->f_data;
|
|
|
|
switch(kn->kn_filter) {
|
|
case EVFILT_WRITE:
|
|
/* need the peer structure, not our own */
|
|
cpipe = cpipe->pipe_peer;
|
|
|
|
/* if reader end already closed, just return */
|
|
if (!cpipe)
|
|
return;
|
|
|
|
break;
|
|
default:
|
|
/* nothing to do */
|
|
break;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (kn->kn_hook != cpipe)
|
|
panic("filt_pipedetach: inconsistent knote");
|
|
#endif
|
|
|
|
PIPE_LOCK(cpipe);
|
|
SLIST_REMOVE(&cpipe->pipe_sel.sel_note, kn, knote, kn_selnext);
|
|
PIPE_UNLOCK(cpipe);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_piperead(struct knote *kn, long hint)
|
|
{
|
|
struct pipe *rpipe = (struct pipe *)kn->kn_fp->f_data;
|
|
struct pipe *wpipe = rpipe->pipe_peer;
|
|
|
|
PIPE_LOCK(rpipe);
|
|
kn->kn_data = rpipe->pipe_buffer.cnt;
|
|
if ((kn->kn_data == 0) && (rpipe->pipe_state & PIPE_DIRECTW))
|
|
kn->kn_data = rpipe->pipe_map.cnt;
|
|
|
|
if ((rpipe->pipe_state & PIPE_EOF) ||
|
|
(wpipe == NULL) || (wpipe->pipe_state & PIPE_EOF)) {
|
|
kn->kn_flags |= EV_EOF;
|
|
PIPE_UNLOCK(rpipe);
|
|
return (1);
|
|
}
|
|
PIPE_UNLOCK(rpipe);
|
|
return (kn->kn_data > 0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_pipewrite(struct knote *kn, long hint)
|
|
{
|
|
struct pipe *rpipe = (struct pipe *)kn->kn_fp->f_data;
|
|
struct pipe *wpipe = rpipe->pipe_peer;
|
|
|
|
PIPE_LOCK(rpipe);
|
|
if ((wpipe == NULL) || (wpipe->pipe_state & PIPE_EOF)) {
|
|
kn->kn_data = 0;
|
|
kn->kn_flags |= EV_EOF;
|
|
PIPE_UNLOCK(rpipe);
|
|
return (1);
|
|
}
|
|
kn->kn_data = wpipe->pipe_buffer.size - wpipe->pipe_buffer.cnt;
|
|
if (wpipe->pipe_state & PIPE_DIRECTW)
|
|
kn->kn_data = 0;
|
|
|
|
PIPE_UNLOCK(rpipe);
|
|
return (kn->kn_data >= PIPE_BUF);
|
|
}
|
|
|
|
static const struct filterops pipe_rfiltops =
|
|
{ 1, NULL, filt_pipedetach, filt_piperead };
|
|
static const struct filterops pipe_wfiltops =
|
|
{ 1, NULL, filt_pipedetach, filt_pipewrite };
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
pipe_kqfilter(struct file *fp, struct knote *kn)
|
|
{
|
|
struct pipe *cpipe;
|
|
|
|
cpipe = (struct pipe *)kn->kn_fp->f_data;
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
kn->kn_fop = &pipe_rfiltops;
|
|
break;
|
|
case EVFILT_WRITE:
|
|
kn->kn_fop = &pipe_wfiltops;
|
|
cpipe = cpipe->pipe_peer;
|
|
if (cpipe == NULL) {
|
|
/* other end of pipe has been closed */
|
|
return (EBADF);
|
|
}
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
kn->kn_hook = cpipe;
|
|
|
|
PIPE_LOCK(cpipe);
|
|
SLIST_INSERT_HEAD(&cpipe->pipe_sel.sel_note, kn, kn_selnext);
|
|
PIPE_UNLOCK(cpipe);
|
|
return (0);
|
|
}
|
|
|
|
#ifdef __NetBSD__
|
|
static int
|
|
pipe_fcntl(fp, cmd, data, p)
|
|
struct file *fp;
|
|
u_int cmd;
|
|
caddr_t data;
|
|
struct proc *p;
|
|
{
|
|
if (cmd == F_SETFL)
|
|
return (0);
|
|
else
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* Handle pipe sysctls.
|
|
*/
|
|
int
|
|
sysctl_dopipe(name, namelen, oldp, oldlenp, newp, newlen)
|
|
int *name;
|
|
u_int namelen;
|
|
void *oldp;
|
|
size_t *oldlenp;
|
|
void *newp;
|
|
size_t newlen;
|
|
{
|
|
/* All sysctl names at this level are terminal. */
|
|
if (namelen != 1)
|
|
return (ENOTDIR); /* overloaded */
|
|
|
|
switch (name[0]) {
|
|
case KERN_PIPE_MAXKVASZ:
|
|
return (sysctl_int(oldp, oldlenp, newp, newlen, &maxpipekva));
|
|
case KERN_PIPE_LIMITKVA:
|
|
return (sysctl_int(oldp, oldlenp, newp, newlen, &limitpipekva));
|
|
case KERN_PIPE_MAXBIGPIPES:
|
|
return (sysctl_int(oldp, oldlenp, newp, newlen, &maxbigpipes));
|
|
case KERN_PIPE_NBIGPIPES:
|
|
return (sysctl_rdint(oldp, oldlenp, newp, nbigpipe));
|
|
case KERN_PIPE_KVASIZE:
|
|
return (sysctl_rdint(oldp, oldlenp, newp, amountpipekva));
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Initialize pipe structs.
|
|
*/
|
|
void
|
|
pipe_init(void)
|
|
{
|
|
pool_init(&pipe_pool, sizeof(struct pipe), 0, 0, 0, "pipepl", NULL);
|
|
}
|
|
|
|
#endif /* __NetBSD __ */
|