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

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/* $NetBSD: linux_misc_notalpha.c,v 1.24 1995/12/18 14:35:08 fvdl Exp $ */
/*
* Copyright (c) 1995 Frank van der Linden
* All rights reserved.
*
* 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 for the NetBSD Project
* by Frank van der Linden
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/dir.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/ptrace.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/syscallargs.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <compat/linux/linux_types.h>
#include <compat/linux/linux_fcntl.h>
#include <compat/linux/linux_mmap.h>
#include <compat/linux/linux_signal.h>
#include <compat/linux/linux_syscallargs.h>
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_dirent.h>
/*
* 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.
*/
static int
bsd_to_linux_wstat(status)
int *status;
{
if (WIFSIGNALED(*status))
*status = (*status & ~0177) |
bsd_to_linux_sig[WTERMSIG(*status)];
else if (WIFSTOPPED(*status))
*status = (*status & ~0xff00) |
(bsd_to_linux_sig[WSTOPSIG(*status)] << 8);
}
/*
* waitpid(2). Passed on to the NetBSD call, surrounded by code to
* reserve some space for a NetBSD-style wait status, and converting
* it to what Linux wants.
*/
int
linux_sys_waitpid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_waitpid_args /* {
syscallarg(int) pid;
syscallarg(int *) status;
syscallarg(int) options;
} */ *uap = v;
struct sys_wait4_args w4a;
int error, *status, tstat;
caddr_t sg;
if (SCARG(uap, status) != NULL) {
sg = stackgap_init(p->p_emul);
status = (int *) stackgap_alloc(&sg, sizeof status);
} else
status = NULL;
SCARG(&w4a, pid) = SCARG(uap, pid);
SCARG(&w4a, status) = status;
SCARG(&w4a, options) = SCARG(uap, options);
SCARG(&w4a, rusage) = NULL;
if ((error = sys_wait4(p, &w4a, retval)))
return error;
p->p_siglist &= ~sigmask(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;
}
/*
* 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;
caddr_t sg;
if (SCARG(uap, status) != NULL) {
sg = stackgap_init(p->p_emul);
status = (int *) stackgap_alloc(&sg, sizeof status);
} else
status = NULL;
SCARG(&w4a, pid) = SCARG(uap, pid);
SCARG(&w4a, status) = status;
SCARG(&w4a, options) = SCARG(uap, options);
SCARG(&w4a, rusage) = SCARG(uap, rusage);
if ((error = sys_wait4(p, &w4a, retval)))
return error;
p->p_siglist &= ~sigmask(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;
}
/*
* This is the old brk(2) call. I don't think anything in the Linux
* world uses this anymore
*/
int
linux_sys_break(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_brk_args /* {
syscallarg(char *) nsize;
} */ *uap = v;
return ENOSYS;
}
/*
* 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;
int error = 0;
caddr_t oldbrk, newbrk;
oldbrk = vm->vm_daddr + ctob(vm->vm_dsize);
/*
* XXX inconsistent.. Linux always returns at least the old
* brk value, but it will be page-aligned if this fails,
* and possibly not page aligned if it succeeds (the user
* supplied pointer is returned).
*/
SCARG(&oba, nsize) = nbrk;
if ((caddr_t) nbrk > vm->vm_daddr && sys_obreak(p, &oba, retval) == 0)
retval[0] = (register_t)nbrk;
else
retval[0] = (register_t)oldbrk;
return 0;
}
/*
* I wonder why Linux has gettimeofday() _and_ time().. Still, we
* need to deal with it.
*/
int
linux_sys_time(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_time_args /* {
linux_time_t *t;
} */ *uap = v;
struct timeval atv;
linux_time_t tt;
int error;
microtime(&atv);
tt = atv.tv_sec;
if (SCARG(uap, t) && (error = copyout(&tt, SCARG(uap, t), sizeof tt)))
return error;
retval[0] = tt;
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(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));
LINUX_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);
}
/*
* 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;
extern char ostype[], hostname[], osrelease[], version[], machine[],
domainname[];
struct linux_utsname luts;
int len;
char *cp;
strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strncpy(luts.l_release, osrelease, sizeof(luts.l_release));
strncpy(luts.l_version, version, sizeof(luts.l_version));
strncpy(luts.l_machine, machine, sizeof(luts.l_machine));
strncpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
/* This part taken from the the uname() in libc */
len = sizeof(luts.l_version);
for (cp = luts.l_version; len--; ++cp)
if (*cp == '\n' || *cp == '\t')
if (len > 1)
*cp = ' ';
else
*cp = '\0';
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
int
linux_sys_olduname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uname_args /* {
syscallarg(struct linux_oldutsname *) up;
} */ *uap = v;
extern char ostype[], hostname[], osrelease[], version[], machine[];
struct linux_oldutsname luts;
int len;
char *cp;
strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strncpy(luts.l_release, osrelease, sizeof(luts.l_release));
strncpy(luts.l_version, version, sizeof(luts.l_version));
strncpy(luts.l_machine, machine, sizeof(luts.l_machine));
/* This part taken from the the uname() in libc */
len = sizeof(luts.l_version);
for (cp = luts.l_version; len--; ++cp)
if (*cp == '\n' || *cp == '\t')
if (len > 1)
*cp = ' ';
else
*cp = '\0';
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
int
linux_sys_oldolduname(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_uname_args /* {
syscallarg(struct linux_oldoldutsname *) up;
} */ *uap = v;
extern char ostype[], hostname[], osrelease[], version[], machine[];
struct linux_oldoldutsname luts;
int len;
char *cp;
strncpy(luts.l_sysname, ostype, sizeof(luts.l_sysname));
strncpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
strncpy(luts.l_release, osrelease, sizeof(luts.l_release));
strncpy(luts.l_version, version, sizeof(luts.l_version));
strncpy(luts.l_machine, machine, sizeof(luts.l_machine));
/* This part taken from the the uname() in libc */
len = sizeof(luts.l_version);
for (cp = luts.l_version; len--; ++cp)
if (*cp == '\n' || *cp == '\t')
if (len > 1)
*cp = ' ';
else
*cp = '\0';
return copyout(&luts, SCARG(uap, up), sizeof(luts));
}
/*
* Linux wants to pass everything to a syscall in registers. However,
* mmap() has 6 of them. Oops: out of register error. They just pass
* everything in a structure.
*/
int
linux_sys_mmap(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_mmap_args /* {
syscallarg(struct linux_mmap *) lmp;
} */ *uap = v;
struct linux_mmap lmap;
struct sys_mmap_args cma;
int error, flags;
if ((error = copyin(SCARG(uap, lmp), &lmap, sizeof lmap)))
return error;
flags = 0;
flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_SHARED, MAP_SHARED);
flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_PRIVATE, MAP_PRIVATE);
flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_FIXED, MAP_FIXED);
flags |= cvtto_bsd_mask(lmap.lm_flags, LINUX_MAP_ANON, MAP_ANON);
SCARG(&cma,addr) = lmap.lm_addr;
SCARG(&cma,len) = lmap.lm_len;
SCARG(&cma,prot) = lmap.lm_prot;
SCARG(&cma,flags) = flags;
SCARG(&cma,fd) = lmap.lm_fd;
SCARG(&cma,pad) = 0;
SCARG(&cma,pos) = lmap.lm_pos;
return sys_mmap(p, &cma, retval);
}
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_msync_args bma;
/* flags are ignored */
SCARG(&bma, addr) = SCARG(uap, addr);
SCARG(&bma, len) = SCARG(uap, len);
return sys_msync(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;
}
/*
* NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
* Linux directly passes the pointer.
*/
int
linux_sys_pipe(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_pipe_args /* {
syscallarg(int *) pfds;
} */ *uap = v;
int error;
if ((error = sys_pipe(p, 0, retval)))
return error;
/* Assumes register_t is an int */
if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int))))
return error;
retval[0] = 0;
return 0;
}
/*
* Alarm. This is a libc call which uses setitimer(2) in NetBSD.
* Fiddle with the timers to make it work.
*/
int
linux_sys_alarm(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_alarm_args /* {
syscallarg(unsigned int) secs;
} */ *uap = v;
int error, s;
struct itimerval *itp, it;
itp = &p->p_realtimer;
s = splclock();
/*
* Clear any pending timer alarms.
*/
untimeout(realitexpire, p);
timerclear(&itp->it_interval);
if (timerisset(&itp->it_value) &&
timercmp(&itp->it_value, &time, >))
timersub(&itp->it_value, &time, &itp->it_value);
/*
* Return how many seconds were left (rounded up)
*/
retval[0] = itp->it_value.tv_sec;
if (itp->it_value.tv_usec)
retval[0]++;
/*
* alarm(0) just resets the timer.
*/
if (SCARG(uap, secs) == 0) {
timerclear(&itp->it_value);
splx(s);
return 0;
}
/*
* Check the new alarm time for sanity, and set it.
*/
timerclear(&it.it_interval);
it.it_value.tv_sec = SCARG(uap, secs);
it.it_value.tv_usec = 0;
if (itimerfix(&it.it_value) || itimerfix(&it.it_interval)) {
splx(s);
return (EINVAL);
}
if (timerisset(&it.it_value)) {
timeradd(&it.it_value, &time, &it.it_value);
timeout(realitexpire, p, hzto(&it.it_value));
}
p->p_realtimer = it;
splx(s);
return 0;
}
/*
* utime(). Do conversion to things that utimes() understands,
* and pass it on.
*/
int
linux_sys_utime(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_utime_args /* {
syscallarg(char *) path;
syscallarg(struct linux_utimbuf *)times;
} */ *uap = v;
caddr_t sg;
int error;
struct sys_utimes_args ua;
struct timeval tv[2], *tvp;
struct linux_utimbuf lut;
sg = stackgap_init(p->p_emul);
LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
SCARG(&ua, path) = SCARG(uap, path);
if (SCARG(uap, times) != NULL) {
if ((error = copyin(SCARG(uap, times), &lut, sizeof lut)))
return error;
tv[0].tv_usec = tv[1].tv_usec = 0;
tv[0].tv_sec = lut.l_actime;
tv[1].tv_sec = lut.l_modtime;
tvp = (struct timeval *) stackgap_alloc(&sg, sizeof(tv));
if ((error = copyout(tv, tvp, sizeof tv)))
return error;
SCARG(&ua, tptr) = tvp;
}
else
SCARG(&ua, tptr) = NULL;
return sys_utimes(p, uap, retval);
}
/*
* The old Linux readdir was only able to read one entry at a time,
* even though it had a 'count' argument. In fact, the emulation
* of the old call was better than the original, because it did handle
* the count arg properly. Don't bother with it anymore now, and use
* it to distinguish between old and new. The difference is that the
* newer one actually does multiple entries, and the reclen field
* really is the reclen, not the namelength.
*/
int
linux_sys_readdir(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_readdir_args /* {
syscallarg(int) fd;
syscallarg(struct linux_dirent *) dent;
syscallarg(unsigned int) count;
} */ *uap = v;
SCARG(uap, count) = 1;
return linux_sys_getdents(p, uap, retval);
}
/*
* 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_readdir_args /* {
syscallarg(int) fd;
syscallarg(caddr_t) dent;
syscallarg(unsigned int) count;
} */ *uap = v;
register 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;/* 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;
u_long *cookiebuf, *cookie;
int ncookies;
if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
return (error);
if ((fp->f_flag & FREAD) == 0)
return (EBADF);
vp = (struct vnode *)fp->f_data;
if (vp->v_type != VDIR) /* XXX vnode readdir op should do this */
return (EINVAL);
if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)))
return error;
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);
oldcall = 0;
}
buf = malloc(buflen, M_TEMP, M_WAITOK);
ncookies = buflen / 16;
cookiebuf = malloc(ncookies * sizeof(*cookiebuf), M_TEMP, M_WAITOK);
VOP_LOCK(vp);
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 = 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++;
off = *cookie++;
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 {
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 == 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);
free(cookiebuf, M_TEMP);
free(buf, M_TEMP);
return error;
}
/*
* Not sure why the arguments to this older version of select() were put
* into a structure, because there are 5, and that can all be handled
* in registers on the i386 like Linux wants to.
*/
int
linux_sys_oldselect(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_oldselect_args /* {
syscallarg(struct linux_select *) lsp;
} */ *uap = v;
struct linux_select ls;
int error;
if ((error = copyin(SCARG(uap, lsp), &ls, sizeof(ls))))
return error;
return linux_select1(p, retval, ls.nfds, ls.readfds, ls.writefds,
ls.exceptfds, ls.timeout);
}
/*
* 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;
}
/*
* The calls are here because of type conversions.
*/
int
linux_sys_setreuid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setreuid_args /* {
syscallarg(int) ruid;
syscallarg(int) euid;
} */ *uap = v;
struct compat_43_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 compat_43_sys_setreuid(p, &bsa, retval);
}
int
linux_sys_setregid(p, v, retval)
struct proc *p;
void *v;
register_t *retval;
{
struct linux_sys_setregid_args /* {
syscallarg(int) rgid;
syscallarg(int) egid;
} */ *uap = v;
struct compat_43_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 compat_43_sys_setregid(p, &bsa, retval);
}
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