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NetBSD/sys/compat/linux/common/linux_misc.c

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/* $NetBSD: linux_misc.c,v 1.96 2001/12/09 03:07:43 chs Exp $ */
/*-
* Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
* of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Linux compatibility module. Try to deal with various Linux system calls.
*/
/*
* These functions have been moved to multiarch to allow
* selection of which machines include them to be
* determined by the individual files.linux_<arch> files.
*
* Function in multiarch:
* linux_sys_break : linux_break.c
* linux_sys_alarm : linux_misc_notalpha.c
* linux_sys_getresgid : linux_misc_notalpha.c
* linux_sys_nice : linux_misc_notalpha.c
* linux_sys_readdir : linux_misc_notalpha.c
* linux_sys_setresgid : linux_misc_notalpha.c
* linux_sys_time : linux_misc_notalpha.c
* linux_sys_utime : linux_misc_notalpha.c
* linux_sys_waitpid : linux_misc_notalpha.c
* linux_sys_old_mmap : linux_oldmmap.c
* linux_sys_oldolduname : linux_oldolduname.c
* linux_sys_oldselect : linux_oldselect.c
* linux_sys_olduname : linux_olduname.c
* linux_sys_pipe : linux_pipe.c
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_misc.c,v 1.96 2001/12/09 03:07:43 chs Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <sys/unistd.h>
#include <sys/swap.h> /* for SWAP_ON */
#include <sys/sysctl.h> /* for KERN_DOMAINNAME */
#include <sys/ptrace.h>
#include <machine/ptrace.h>
#include <sys/syscallargs.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/common/linux_fcntl.h>
#include <compat/linux/common/linux_mmap.h>
#include <compat/linux/common/linux_dirent.h>
#include <compat/linux/common/linux_util.h>
#include <compat/linux/common/linux_misc.h>
#include <compat/linux/common/linux_ptrace.h>
#include <compat/linux/common/linux_reboot.h>
#include <compat/linux/common/linux_emuldata.h>
const int linux_ptrace_request_map[] = {
LINUX_PTRACE_TRACEME, PT_TRACE_ME,
LINUX_PTRACE_PEEKTEXT, PT_READ_I,
LINUX_PTRACE_PEEKDATA, PT_READ_D,
LINUX_PTRACE_POKETEXT, PT_WRITE_I,
LINUX_PTRACE_POKEDATA, PT_WRITE_D,
LINUX_PTRACE_CONT, PT_CONTINUE,
LINUX_PTRACE_KILL, PT_KILL,
LINUX_PTRACE_ATTACH, PT_ATTACH,
LINUX_PTRACE_DETACH, PT_DETACH,
#ifdef PT_STEP
LINUX_PTRACE_SINGLESTEP, PT_STEP,
#endif
-1
};
/* Local linux_misc.c functions: */
static void bsd_to_linux_statfs __P((struct statfs *, struct linux_statfs *));
/*
* The information on a terminated (or stopped) process needs
* to be converted in order for Linux binaries to get a valid signal
* number out of it.
*/
void
bsd_to_linux_wstat(st)
int *st;
{
int sig;
if (WIFSIGNALED(*st)) {
sig = WTERMSIG(*st);
if (sig >= 0 && sig < NSIG)
*st= (*st& ~0177) | native_to_linux_sig[sig];
} else if (WIFSTOPPED(*st)) {
sig = WSTOPSIG(*st);
if (sig >= 0 && sig < NSIG)
*st = (*st & ~0xff00) | (native_to_linux_sig[sig] << 8);
}
}
/*
* This is very much the same as waitpid()
*/
int
linux_sys_wait4(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_wait4_args /* {
syscallarg(int) pid;
syscallarg(int *) status;
syscallarg(int) options;
syscallarg(struct rusage *) rusage;
} */ *uap = v;
struct sys_wait4_args w4a;
int error, *status, tstat, options, linux_options;
caddr_t sg;
if (SCARG(uap, status) != NULL) {
sg = stackgap_init(p->p_emul);
status = (int *) stackgap_alloc(&sg, sizeof *status);
} else
status = NULL;
linux_options = SCARG(uap, options);
options = 0;
if (linux_options &
~(LINUX_WAIT4_WNOHANG|LINUX_WAIT4_WUNTRACED|LINUX_WAIT4_WALL|
LINUX_WAIT4_WCLONE))
return (EINVAL);
if (linux_options & LINUX_WAIT4_WNOHANG)
options |= WNOHANG;
if (linux_options & LINUX_WAIT4_WUNTRACED)
options |= WUNTRACED;
if (linux_options & LINUX_WAIT4_WALL)
options |= WALLSIG;
if (linux_options & LINUX_WAIT4_WCLONE)
options |= WALTSIG;
SCARG(&w4a, pid) = SCARG(uap, pid);
SCARG(&w4a, status) = status;
SCARG(&w4a, options) = options;
SCARG(&w4a, rusage) = SCARG(uap, rusage);
if ((error = sys_wait4(p, &w4a, retval)))
return error;
sigdelset(&p->p_sigctx.ps_siglist, SIGCHLD);
if (status != NULL) {
if ((error = copyin(status, &tstat, sizeof tstat)))
return error;
bsd_to_linux_wstat(&tstat);
return copyout(&tstat, SCARG(uap, status), sizeof tstat);
}
return 0;
}
/*
* Linux brk(2). The check if the new address is >= the old one is
* done in the kernel in Linux. NetBSD does it in the library.
*/
int
linux_sys_brk(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_brk_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
char *nbrk = SCARG(uap, nsize);
struct sys_obreak_args oba;
struct vmspace *vm = p->p_vmspace;
struct linux_emuldata *ed = (struct linux_emuldata*)p->p_emuldata;
SCARG(&oba, nsize) = nbrk;
if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(p, &oba, retval) == 0)
ed->p_break = (char*)nbrk;
else
nbrk = ed->p_break;
retval[0] = (register_t)nbrk;
return 0;
}
/*
* Convert BSD statfs structure to Linux statfs structure.
* The Linux structure has less fields, and it also wants
* the length of a name in a dir entry in a field, which
* we fake (probably the wrong way).
*/
static void
bsd_to_linux_statfs(bsp, lsp)
struct statfs *bsp;
struct linux_statfs *lsp;
{
lsp->l_ftype = bsp->f_type;
lsp->l_fbsize = bsp->f_bsize;
lsp->l_fblocks = bsp->f_blocks;
lsp->l_fbfree = bsp->f_bfree;
lsp->l_fbavail = bsp->f_bavail;
lsp->l_ffiles = bsp->f_files;
lsp->l_fffree = bsp->f_ffree;
lsp->l_ffsid.val[0] = bsp->f_fsid.val[0];
lsp->l_ffsid.val[1] = bsp->f_fsid.val[1];
lsp->l_fnamelen = MAXNAMLEN; /* XXX */
}
/*
* Implement the fs stat functions. Straightforward.
*/
int
linux_sys_statfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_statfs_args /* {
syscallarg(const char *) path;
syscallarg(struct linux_statfs *) sp;
} */ *uap = v;
struct statfs btmp, *bsp;
struct linux_statfs ltmp;
struct sys_statfs_args bsa;
caddr_t sg;
int error;
sg = stackgap_init(p->p_emul);
bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs));
CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
SCARG(&bsa, path) = SCARG(uap, path);
SCARG(&bsa, buf) = bsp;
if ((error = sys_statfs(p, &bsa, retval)))
return error;
if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp)))
return error;
bsd_to_linux_statfs(&btmp, &ltmp);
return copyout((caddr_t) &ltmp, (caddr_t) SCARG(uap, sp), sizeof ltmp);
}
int
linux_sys_fstatfs(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_fstatfs_args /* {
syscallarg(int) fd;
syscallarg(struct linux_statfs *) sp;
} */ *uap = v;
struct statfs btmp, *bsp;
struct linux_statfs ltmp;
struct sys_fstatfs_args bsa;
caddr_t sg;
int error;
sg = stackgap_init(p->p_emul);
bsp = (struct statfs *) stackgap_alloc(&sg, sizeof (struct statfs));
SCARG(&bsa, fd) = SCARG(uap, fd);
SCARG(&bsa, buf) = bsp;
if ((error = sys_fstatfs(p, &bsa, retval)))
return error;
if ((error = copyin((caddr_t) bsp, (caddr_t) &btmp, sizeof btmp)))
return error;
bsd_to_linux_statfs(&btmp, &ltmp);
return copyout((caddr_t) &ltmp, (caddr_t) SCARG(uap, sp), sizeof ltmp);
}
char linux_sysname[] = "Linux";
char linux_release[] = "2.0.38";
char linux_version[] = "#0 Sun Apr 1 11:11:11 MET 2000";
/*
* uname(). Just copy the info from the various strings stored in the
* kernel, and put it in the Linux utsname structure. That structure
* is almost the same as the NetBSD one, only it has fields 65 characters
* long, and an extra domainname field.
*/
int
linux_sys_uname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uname_args /* {
syscallarg(struct linux_utsname *) up;
} */ *uap = v;
struct linux_utsname luts;
strncpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strncpy(luts.l_release, linux_release, sizeof(luts.l_release));
strncpy(luts.l_version, linux_version, sizeof(luts.l_version));
strncpy(luts.l_machine, machine, sizeof(luts.l_machine));
strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
/* Used directly on: alpha, mips, ppc, sparc, sparc64 */
/* Used indirectly on: arm, i386, m68k */
/*
* New type Linux mmap call.
* Only called directly on machines with >= 6 free regs.
*/
int
linux_sys_mmap(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_mmap_args /* {
syscallarg(unsigned long) addr;
syscallarg(size_t) len;
syscallarg(int) prot;
syscallarg(int) flags;
syscallarg(int) fd;
syscallarg(linux_off_t) offset;
} */ *uap = v;
struct sys_mmap_args cma;
int flags;
flags = 0;
flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_SHARED, MAP_SHARED);
flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_PRIVATE, MAP_PRIVATE);
flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_FIXED, MAP_FIXED);
flags |= cvtto_bsd_mask(SCARG(uap,flags), LINUX_MAP_ANON, MAP_ANON);
/* XXX XAX ERH: Any other flags here? There are more defined... */
SCARG(&cma,addr) = (void *)SCARG(uap, addr);
SCARG(&cma,len) = SCARG(uap, len);
SCARG(&cma,prot) = SCARG(uap, prot);
if (SCARG(&cma,prot) & VM_PROT_WRITE) /* XXX */
SCARG(&cma,prot) |= VM_PROT_READ;
SCARG(&cma,flags) = flags;
SCARG(&cma,fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd);
SCARG(&cma,pad) = 0;
SCARG(&cma,pos) = (off_t)SCARG(uap, offset);
return sys_mmap(p, &cma, retval);
}
int
linux_sys_mremap(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_mremap_args /* {
syscallarg(void *) old_address;
syscallarg(size_t) old_size;
syscallarg(size_t) new_size;
syscallarg(u_long) flags;
} */ *uap = v;
struct sys_munmap_args mua;
size_t old_size, new_size;
int error;
old_size = round_page(SCARG(uap, old_size));
new_size = round_page(SCARG(uap, new_size));
/*
* Growing mapped region.
*/
if (new_size > old_size) {
/*
* XXX Implement me. What we probably want to do is
* XXX dig out the guts of the old mapping, mmap that
* XXX object again with the new size, then munmap
* XXX the old mapping.
*/
*retval = 0;
return (ENOMEM);
}
/*
* Shrinking mapped region.
*/
if (new_size < old_size) {
SCARG(&mua, addr) = (caddr_t)SCARG(uap, old_address) +
new_size;
SCARG(&mua, len) = old_size - new_size;
error = sys_munmap(p, &mua, retval);
*retval = error ? 0 : (register_t)SCARG(uap, old_address);
return (error);
}
/*
* No change.
*/
*retval = (register_t)SCARG(uap, old_address);
return (0);
}
int
linux_sys_msync(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_msync_args /* {
syscallarg(caddr_t) addr;
syscallarg(int) len;
syscallarg(int) fl;
} */ *uap = v;
struct sys___msync13_args bma;
/* flags are ignored */
SCARG(&bma, addr) = SCARG(uap, addr);
SCARG(&bma, len) = SCARG(uap, len);
SCARG(&bma, flags) = SCARG(uap, fl);
return sys___msync13(p, &bma, retval);
}
/*
* This code is partly stolen from src/lib/libc/compat-43/times.c
* XXX - CLK_TCK isn't declared in /sys, just in <time.h>, done here
*/
#define CLK_TCK 100
#define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
int
linux_sys_times(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_times_args /* {
syscallarg(struct times *) tms;
} */ *uap = v;
struct timeval t;
struct linux_tms ltms;
struct rusage ru;
int error, s;
calcru(p, &ru.ru_utime, &ru.ru_stime, NULL);
ltms.ltms_utime = CONVTCK(ru.ru_utime);
ltms.ltms_stime = CONVTCK(ru.ru_stime);
ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime);
ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime);
if ((error = copyout(&ltms, SCARG(uap, tms), sizeof ltms)))
return error;
s = splclock();
timersub(&time, &boottime, &t);
splx(s);
retval[0] = ((linux_clock_t)(CONVTCK(t)));
return 0;
}
/*
* Linux 'readdir' call. This code is mostly taken from the
* SunOS getdents call (see compat/sunos/sunos_misc.c), though
* an attempt has been made to keep it a little cleaner (failing
* miserably, because of the cruft needed if count 1 is passed).
*
* The d_off field should contain the offset of the next valid entry,
* but in Linux it has the offset of the entry itself. We emulate
* that bug here.
*
* Read in BSD-style entries, convert them, and copy them out.
*
* Note that this doesn't handle union-mounted filesystems.
*/
int
linux_sys_getdents(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getdents_args /* {
syscallarg(int) fd;
syscallarg(struct linux_dirent *) dent;
syscallarg(unsigned int) count;
} */ *uap = v;
struct dirent *bdp;
struct vnode *vp;
caddr_t inp, buf; /* BSD-format */
int len, reclen; /* BSD-format */
caddr_t outp; /* Linux-format */
int resid, linux_reclen = 0; /* Linux-format */
struct file *fp;
struct uio auio;
struct iovec aiov;
struct linux_dirent idb;
off_t off; /* true file offset */
int buflen, error, eofflag, nbytes, oldcall;
struct vattr va;
off_t *cookiebuf = NULL, *cookie;
int ncookies;
/* getvnode() will use the descriptor for us */
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0) {
error = EBADF;
goto out1;
}
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR) {
error = EINVAL;
goto out1;
}
if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)))
goto out1;
nbytes = SCARG(uap, count);
if (nbytes == 1) { /* emulating old, broken behaviour */
nbytes = sizeof (struct linux_dirent);
buflen = max(va.va_blocksize, nbytes);
oldcall = 1;
} else {
buflen = min(MAXBSIZE, nbytes);
if (buflen < va.va_blocksize)
buflen = va.va_blocksize;
oldcall = 0;
}
buf = malloc(buflen, M_TEMP, M_WAITOK);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
off = fp->f_offset;
again:
aiov.iov_base = buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_procp = p;
auio.uio_resid = buflen;
auio.uio_offset = off;
/*
* First we read into the malloc'ed buffer, then
* we massage it into user space, one record at a time.
*/
error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
&ncookies);
if (error)
goto out;
inp = buf;
outp = (caddr_t)SCARG(uap, dent);
resid = nbytes;
if ((len = buflen - auio.uio_resid) == 0)
goto eof;
for (cookie = cookiebuf; len > 0; len -= reclen) {
bdp = (struct dirent *)inp;
reclen = bdp->d_reclen;
if (reclen & 3)
panic("linux_readdir");
if (bdp->d_fileno == 0) {
inp += reclen; /* it is a hole; squish it out */
off = *cookie++;
continue;
}
linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen);
if (reclen > len || resid < linux_reclen) {
/* entry too big for buffer, so just stop */
outp++;
break;
}
/*
* Massage in place to make a Linux-shaped dirent (otherwise
* we have to worry about touching user memory outside of
* the copyout() call).
*/
idb.d_ino = (linux_ino_t)bdp->d_fileno;
/*
* The old readdir() call misuses the offset and reclen fields.
*/
if (oldcall) {
idb.d_off = (linux_off_t)linux_reclen;
idb.d_reclen = (u_short)bdp->d_namlen;
} else {
if (sizeof (linux_off_t) < 4 && (off >> 32) != 0) {
compat_offseterr(vp, "linux_getdents");
error = EINVAL;
goto out;
}
idb.d_off = (linux_off_t)off;
idb.d_reclen = (u_short)linux_reclen;
}
strcpy(idb.d_name, bdp->d_name);
if ((error = copyout((caddr_t)&idb, outp, linux_reclen)))
goto out;
/* advance past this real entry */
inp += reclen;
off = *cookie++; /* each entry points to itself */
/* advance output past Linux-shaped entry */
outp += linux_reclen;
resid -= linux_reclen;
if (oldcall)
break;
}
/* if we squished out the whole block, try again */
if (outp == (caddr_t)SCARG(uap, dent))
goto again;
fp->f_offset = off; /* update the vnode offset */
if (oldcall)
nbytes = resid + linux_reclen;
eof:
*retval = nbytes - resid;
out:
VOP_UNLOCK(vp, 0);
if (cookiebuf)
free(cookiebuf, M_TEMP);
free(buf, M_TEMP);
out1:
FILE_UNUSE(fp, p);
return error;
}
/*
* Even when just using registers to pass arguments to syscalls you can
* have 5 of them on the i386. So this newer version of select() does
* this.
*/
int
linux_sys_select(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_select_args /* {
syscallarg(int) nfds;
syscallarg(fd_set *) readfds;
syscallarg(fd_set *) writefds;
syscallarg(fd_set *) exceptfds;
syscallarg(struct timeval *) timeout;
} */ *uap = v;
return linux_select1(p, retval, SCARG(uap, nfds), SCARG(uap, readfds),
SCARG(uap, writefds), SCARG(uap, exceptfds), SCARG(uap, timeout));
}
/*
* Common code for the old and new versions of select(). A couple of
* things are important:
* 1) return the amount of time left in the 'timeout' parameter
* 2) select never returns ERESTART on Linux, always return EINTR
*/
int
linux_select1(p, retval, nfds, readfds, writefds, exceptfds, timeout)
struct proc *p;
register_t *retval;
int nfds;
fd_set *readfds, *writefds, *exceptfds;
struct timeval *timeout;
{
struct sys_select_args bsa;
struct timeval tv0, tv1, utv, *tvp;
caddr_t sg;
int error;
SCARG(&bsa, nd) = nfds;
SCARG(&bsa, in) = readfds;
SCARG(&bsa, ou) = writefds;
SCARG(&bsa, ex) = exceptfds;
SCARG(&bsa, tv) = timeout;
/*
* Store current time for computation of the amount of
* time left.
*/
if (timeout) {
if ((error = copyin(timeout, &utv, sizeof(utv))))
return error;
if (itimerfix(&utv)) {
/*
* The timeval was invalid. Convert it to something
* valid that will act as it does under Linux.
*/
sg = stackgap_init(p->p_emul);
tvp = stackgap_alloc(&sg, sizeof(utv));
utv.tv_sec += utv.tv_usec / 1000000;
utv.tv_usec %= 1000000;
if (utv.tv_usec < 0) {
utv.tv_sec -= 1;
utv.tv_usec += 1000000;
}
if (utv.tv_sec < 0)
timerclear(&utv);
if ((error = copyout(&utv, tvp, sizeof(utv))))
return error;
SCARG(&bsa, tv) = tvp;
}
microtime(&tv0);
}
error = sys_select(p, &bsa, retval);
if (error) {
/*
* See fs/select.c in the Linux kernel. Without this,
* Maelstrom doesn't work.
*/
if (error == ERESTART)
error = EINTR;
return error;
}
if (timeout) {
if (*retval) {
/*
* Compute how much time was left of the timeout,
* by subtracting the current time and the time
* before we started the call, and subtracting
* that result from the user-supplied value.
*/
microtime(&tv1);
timersub(&tv1, &tv0, &tv1);
timersub(&utv, &tv1, &utv);
if (utv.tv_sec < 0)
timerclear(&utv);
} else
timerclear(&utv);
if ((error = copyout(&utv, timeout, sizeof(utv))))
return error;
}
return 0;
}
/*
* Get the process group of a certain process. Look it up
* and return the value.
*/
int
linux_sys_getpgid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getpgid_args /* {
syscallarg(int) pid;
} */ *uap = v;
struct proc *targp;
if (SCARG(uap, pid) != 0 && SCARG(uap, pid) != p->p_pid) {
if ((targp = pfind(SCARG(uap, pid))) == 0)
return ESRCH;
}
else
targp = p;
retval[0] = targp->p_pgid;
return 0;
}
/*
* Set the 'personality' (emulation mode) for the current process. Only
* accept the Linux personality here (0). This call is needed because
* the Linux ELF crt0 issues it in an ugly kludge to make sure that
* ELF binaries run in Linux mode, not SVR4 mode.
*/
int
linux_sys_personality(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_personality_args /* {
syscallarg(int) per;
} */ *uap = v;
if (SCARG(uap, per) != 0)
return EINVAL;
retval[0] = 0;
return 0;
}
#if defined(__i386__) || defined(__m68k__)
/*
* The calls are here because of type conversions.
*/
int
linux_sys_setreuid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setreuid16_args /* {
syscallarg(int) ruid;
syscallarg(int) euid;
} */ *uap = v;
struct sys_setreuid_args bsa;
SCARG(&bsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, ruid);
SCARG(&bsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, euid);
return sys_setreuid(p, &bsa, retval);
}
int
linux_sys_setregid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setregid16_args /* {
syscallarg(int) rgid;
syscallarg(int) egid;
} */ *uap = v;
struct sys_setregid_args bsa;
SCARG(&bsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ?
(uid_t)-1 : SCARG(uap, rgid);
SCARG(&bsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ?
(uid_t)-1 : SCARG(uap, egid);
return sys_setregid(p, &bsa, retval);
}
int
linux_sys_setresuid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setresuid16_args /* {
syscallarg(uid_t) ruid;
syscallarg(uid_t) euid;
syscallarg(uid_t) suid;
} */ *uap = v;
struct linux_sys_setresuid16_args lsa;
SCARG(&lsa, ruid) = ((linux_uid_t)SCARG(uap, ruid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, ruid);
SCARG(&lsa, euid) = ((linux_uid_t)SCARG(uap, euid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, euid);
SCARG(&lsa, suid) = ((linux_uid_t)SCARG(uap, suid) == (linux_uid_t)-1) ?
(uid_t)-1 : SCARG(uap, suid);
return linux_sys_setresuid(p, &lsa, retval);
}
int
linux_sys_setresgid16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setresgid16_args /* {
syscallarg(gid_t) rgid;
syscallarg(gid_t) egid;
syscallarg(gid_t) sgid;
} */ *uap = v;
struct linux_sys_setresgid16_args lsa;
SCARG(&lsa, rgid) = ((linux_gid_t)SCARG(uap, rgid) == (linux_gid_t)-1) ?
(gid_t)-1 : SCARG(uap, rgid);
SCARG(&lsa, egid) = ((linux_gid_t)SCARG(uap, egid) == (linux_gid_t)-1) ?
(gid_t)-1 : SCARG(uap, egid);
SCARG(&lsa, sgid) = ((linux_gid_t)SCARG(uap, sgid) == (linux_gid_t)-1) ?
(gid_t)-1 : SCARG(uap, sgid);
return linux_sys_setresgid(p, &lsa, retval);
}
int
linux_sys_getgroups16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getgroups16_args /* {
syscallarg(int) gidsetsize;
syscallarg(linux_gid_t *) gidset;
} */ *uap = v;
caddr_t sg;
int n, error, i;
struct sys_getgroups_args bsa;
gid_t *bset, *kbset;
linux_gid_t *lset;
struct pcred *pc = p->p_cred;
n = SCARG(uap, gidsetsize);
if (n < 0)
return EINVAL;
error = 0;
bset = kbset = NULL;
lset = NULL;
if (n > 0) {
n = min(pc->pc_ucred->cr_ngroups, n);
sg = stackgap_init(p->p_emul);
bset = stackgap_alloc(&sg, n * sizeof (gid_t));
kbset = malloc(n * sizeof (gid_t), M_TEMP, M_WAITOK);
lset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK);
if (bset == NULL || kbset == NULL || lset == NULL)
return ENOMEM;
SCARG(&bsa, gidsetsize) = n;
SCARG(&bsa, gidset) = bset;
error = sys_getgroups(p, &bsa, retval);
if (error != 0)
goto out;
error = copyin(bset, kbset, n * sizeof (gid_t));
if (error != 0)
goto out;
for (i = 0; i < n; i++)
lset[i] = (linux_gid_t)kbset[i];
error = copyout(lset, SCARG(uap, gidset),
n * sizeof (linux_gid_t));
} else
*retval = pc->pc_ucred->cr_ngroups;
out:
if (kbset != NULL)
free(kbset, M_TEMP);
if (lset != NULL)
free(lset, M_TEMP);
return error;
}
int
linux_sys_setgroups16(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setgroups16_args /* {
syscallarg(int) gidsetsize;
syscallarg(linux_gid_t *) gidset;
} */ *uap = v;
caddr_t sg;
int n;
int error, i;
struct sys_setgroups_args bsa;
gid_t *bset, *kbset;
linux_gid_t *lset;
n = SCARG(uap, gidsetsize);
if (n < 0 || n > NGROUPS)
return EINVAL;
sg = stackgap_init(p->p_emul);
bset = stackgap_alloc(&sg, n * sizeof (gid_t));
lset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK);
kbset = malloc(n * sizeof (linux_gid_t), M_TEMP, M_WAITOK);
if (lset == NULL || bset == NULL)
return ENOMEM;
error = copyin(SCARG(uap, gidset), lset, n * sizeof (linux_gid_t));
if (error != 0)
goto out;
for (i = 0; i < n; i++)
kbset[i] = (gid_t)lset[i];
error = copyout(kbset, bset, n * sizeof (gid_t));
if (error != 0)
goto out;
SCARG(&bsa, gidsetsize) = n;
SCARG(&bsa, gidset) = bset;
error = sys_setgroups(p, &bsa, retval);
out:
if (lset != NULL)
free(lset, M_TEMP);
if (kbset != NULL)
free(kbset, M_TEMP);
return error;
}
#endif /* __i386__ || __m68k__ */
/*
* We have nonexistent fsuid equal to uid.
* If modification is requested, refuse.
*/
int
linux_sys_setfsuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setfsuid_args /* {
syscallarg(uid_t) uid;
} */ *uap = v;
uid_t uid;
uid = SCARG(uap, uid);
if (p->p_cred->p_ruid != uid)
return sys_nosys(p, v, retval);
else
return (0);
}
/* XXX XXX XXX */
#ifndef alpha
int
linux_sys_getfsuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
return sys_getuid(p, v, retval);
}
#endif
int
linux_sys___sysctl(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys___sysctl_args /* {
syscallarg(struct linux___sysctl *) lsp;
} */ *uap = v;
struct linux___sysctl ls;
struct sys___sysctl_args bsa;
int error;
if ((error = copyin(SCARG(uap, lsp), &ls, sizeof ls)))
return error;
SCARG(&bsa, name) = ls.name;
SCARG(&bsa, namelen) = ls.namelen;
SCARG(&bsa, old) = ls.old;
SCARG(&bsa, oldlenp) = ls.oldlenp;
SCARG(&bsa, new) = ls.new;
SCARG(&bsa, newlen) = ls.newlen;
return sys___sysctl(p, &bsa, retval);
}
int
linux_sys_setresuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setresuid_args /* {
syscallarg(uid_t) ruid;
syscallarg(uid_t) euid;
syscallarg(uid_t) suid;
} */ *uap = v;
struct pcred *pc = p->p_cred;
uid_t ruid, euid, suid;
int error;
ruid = SCARG(uap, ruid);
euid = SCARG(uap, euid);
suid = SCARG(uap, suid);
/*
* Note: These checks are a little different than the NetBSD
* setreuid(2) call performs. This precisely follows the
* behavior of the Linux kernel.
*/
if (ruid != (uid_t)-1 &&
ruid != pc->p_ruid &&
ruid != pc->pc_ucred->cr_uid &&
ruid != pc->p_svuid &&
(error = suser(pc->pc_ucred, &p->p_acflag)))
return (error);
if (euid != (uid_t)-1 &&
euid != pc->p_ruid &&
euid != pc->pc_ucred->cr_uid &&
euid != pc->p_svuid &&
(error = suser(pc->pc_ucred, &p->p_acflag)))
return (error);
if (suid != (uid_t)-1 &&
suid != pc->p_ruid &&
suid != pc->pc_ucred->cr_uid &&
suid != pc->p_svuid &&
(error = suser(pc->pc_ucred, &p->p_acflag)))
return (error);
/*
* Now assign the new real, effective, and saved UIDs.
* Note that Linux, unlike NetBSD in setreuid(2), does not
* set the saved UID in this call unless the user specifies
* it.
*/
if (ruid != (uid_t)-1) {
(void)chgproccnt(pc->p_ruid, -1);
(void)chgproccnt(ruid, 1);
pc->p_ruid = ruid;
}
if (euid != (uid_t)-1) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_uid = euid;
}
if (suid != (uid_t)-1)
pc->p_svuid = suid;
if (ruid != (uid_t)-1 && euid != (uid_t)-1 && suid != (uid_t)-1)
p->p_flag |= P_SUGID;
return (0);
}
int
linux_sys_getresuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_getresuid_args /* {
syscallarg(uid_t *) ruid;
syscallarg(uid_t *) euid;
syscallarg(uid_t *) suid;
} */ *uap = v;
struct pcred *pc = p->p_cred;
int error;
/*
* Linux copies these values out to userspace like so:
*
* 1. Copy out ruid.
* 2. If that succeeds, copy out euid.
* 3. If both of those succeed, copy out suid.
*/
if ((error = copyout(&pc->p_ruid, SCARG(uap, ruid),
sizeof(uid_t))) != 0)
return (error);
if ((error = copyout(&pc->pc_ucred->cr_uid, SCARG(uap, euid),
sizeof(uid_t))) != 0)
return (error);
return (copyout(&pc->p_svuid, SCARG(uap, suid), sizeof(uid_t)));
}
int
linux_sys_ptrace(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_ptrace_args /* {
i386, m68k, powerpc: T=int
alpha: T=long
syscallarg(T) request;
syscallarg(T) pid;
syscallarg(T) addr;
syscallarg(T) data;
} */ *uap = v;
const int *ptr;
int request;
int error;
ptr = linux_ptrace_request_map;
request = SCARG(uap, request);
while (*ptr != -1)
if (*ptr++ == request) {
struct sys_ptrace_args pta;
SCARG(&pta, req) = *ptr;
SCARG(&pta, pid) = SCARG(uap, pid);
SCARG(&pta, addr) = (caddr_t)SCARG(uap, addr);
SCARG(&pta, data) = SCARG(uap, data);
/*
* Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually
* to continue where the process left off previously.
* The same thing is achieved by addr == (caddr_t) 1
* on NetBSD, so rewrite 'addr' appropriately.
*/
if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0)
SCARG(&pta, addr) = (caddr_t) 1;
error = sys_ptrace(p, &pta, retval);
if (error)
return error;
switch (request) {
case LINUX_PTRACE_PEEKTEXT:
case LINUX_PTRACE_PEEKDATA:
error = copyout (retval,
(caddr_t)SCARG(uap, data), sizeof *retval);
*retval = SCARG(uap, data);
break;
default:
break;
}
return error;
}
else
ptr++;
return LINUX_SYS_PTRACE_ARCH(p, uap, retval);
}
int
linux_sys_reboot(struct proc *p, void *v, register_t *retval)
{
struct linux_sys_reboot_args /* {
syscallarg(int) magic1;
syscallarg(int) magic2;
syscallarg(int) cmd;
syscallarg(void *) arg;
} */ *uap = v;
struct sys_reboot_args /* {
syscallarg(int) opt;
syscallarg(char *) bootstr;
} */ sra;
int error;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return(error);
if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1)
return(EINVAL);
if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 &&
SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A &&
SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B)
return(EINVAL);
switch (SCARG(uap, cmd)) {
case LINUX_REBOOT_CMD_RESTART:
SCARG(&sra, opt) = RB_AUTOBOOT;
break;
case LINUX_REBOOT_CMD_HALT:
SCARG(&sra, opt) = RB_HALT;
break;
case LINUX_REBOOT_CMD_POWER_OFF:
SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN;
break;
case LINUX_REBOOT_CMD_RESTART2:
/* Reboot with an argument. */
SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING;
SCARG(&sra, bootstr) = SCARG(uap, arg);
break;
case LINUX_REBOOT_CMD_CAD_ON:
return(EINVAL); /* We don't implement ctrl-alt-delete */
case LINUX_REBOOT_CMD_CAD_OFF:
return(0);
default:
return(EINVAL);
}
return(sys_reboot(p, &sra, retval));
}
/*
* Copy of compat_12_sys_swapon().
*/
int
linux_sys_swapon(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_swapctl_args ua;
struct linux_sys_swapon_args /* {
syscallarg(const char *) name;
} */ *uap = v;
SCARG(&ua, cmd) = SWAP_ON;
SCARG(&ua, arg) = (void *)SCARG(uap, name);
SCARG(&ua, misc) = 0; /* priority */
return (sys_swapctl(p, &ua, retval));
}
/*
* Stop swapping to the file or block device specified by path.
*/
int
linux_sys_swapoff(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct sys_swapctl_args ua;
struct linux_sys_swapoff_args /* {
syscallarg(const char *) path;
} */ *uap = v;
SCARG(&ua, cmd) = SWAP_OFF;
SCARG(&ua, arg) = (void *)SCARG(uap, path);
return (sys_swapctl(p, &ua, retval));
}
/*
* Copy of compat_09_sys_setdomainname()
*/
/* ARGSUSED */
int
linux_sys_setdomainname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setdomainname_args /* {
syscallarg(char *) domainname;
syscallarg(int) len;
} */ *uap = v;
int name;
int error;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
name = KERN_DOMAINNAME;
return (kern_sysctl(&name, 1, 0, 0, SCARG(uap, domainname),
SCARG(uap, len), p));
}
/*
* sysinfo()
*/
/* ARGSUSED */
int
linux_sys_sysinfo(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_sysinfo_args /* {
syscallarg(struct linux_sysinfo *) arg;
} */ *uap = v;
struct linux_sysinfo si;
struct loadavg *la;
si.uptime = time.tv_sec - boottime.tv_sec;
la = &averunnable;
si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale;
si.totalram = ctob(physmem);
si.freeram = uvmexp.free * uvmexp.pagesize;
si.sharedram = 0; /* XXX */
si.bufferram = uvmexp.filepages * uvmexp.pagesize;
si.totalswap = uvmexp.swpages * uvmexp.pagesize;
si.freeswap = (uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize;
si.procs = nprocs;
/* The following are only present in newer Linux kernels. */
si.totalbig = 0;
si.freebig = 0;
si.mem_unit = 1;
return (copyout(&si, SCARG(uap, arg), sizeof si));
}
/*
* This gets called for unsupported syscalls. The difference to sys_nosys()
* is that process does not get SIGSYS, the call just returns with ENOSYS.
* This is the way Linux does it and glibc depends on this behaviour.
*/
int
linux_sys_nosys(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
return (ENOSYS);
}
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