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authorfvdl <fvdl@NetBSD.org>1995-02-28 23:24:35 +0000
committerfvdl <fvdl@NetBSD.org>1995-02-28 23:24:35 +0000
commit3bf459f350dcbcf47afccba837f4466b132a98c8 (patch)
tree282143a8f0ed1d8860e89324a32312964e0bd6e8 /sys/compat/linux/linux_misc.c
parent8bb0b6790c84a1e16ffa558fd110fb0d90cd0470 (diff)
Added Linux compat code.
Diffstat (limited to 'sys/compat/linux/linux_misc.c')
-rw-r--r--sys/compat/linux/linux_misc.c726
1 files changed, 726 insertions, 0 deletions
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
new file mode 100644
index 00000000000..3d8df4385e0
--- /dev/null
+++ b/sys/compat/linux/linux_misc.c
@@ -0,0 +1,726 @@
+/* $NetBSD: linux_misc.c,v 1.1 1995/02/28 23:25:07 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_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_waitpid(p, uap, retval)
+ struct proc *p;
+ struct linux_waitpid_args /* {
+ syscallarg(int) pid;
+ syscallarg(int *) status;
+ syscallarg(int) options;
+ } */ *uap;
+ register_t *retval;
+{
+ struct wait4_args w4a;
+ int error, *status, tstat;
+ caddr_t sg;
+
+ sg = stackgap_init();
+ status = (int *) stackgap_alloc(&sg, sizeof status);
+
+ SCARG(&w4a, pid) = SCARG(uap, pid);
+ SCARG(&w4a, status) = status;
+ SCARG(&w4a, options) = SCARG(uap, options);
+ SCARG(&w4a, rusage) = NULL;
+
+ if ((error = wait4(p, &w4a, retval)))
+ return error;
+
+ if ((error = copyin(status, &tstat, sizeof tstat)))
+ return error;
+
+ bsd_to_linux_wstat(&tstat);
+
+ return copyout(&tstat, SCARG(uap, status), sizeof tstat);
+}
+
+/*
+ * This is very much the same as waitpid()
+ */
+int
+linux_wait4(p, uap, retval)
+ struct proc *p;
+ struct linux_wait4_args /* {
+ syscallarg(int) pid;
+ syscallarg(int *) status;
+ syscallarg(int) options;
+ syscallarg(struct rusage *) rusage;
+ } */ *uap;
+ register_t *retval;
+{
+ struct wait4_args w4a;
+ int error, *status, tstat;
+ caddr_t sg;
+
+ sg = stackgap_init();
+ status = (int *) stackgap_alloc(&sg, sizeof status);
+
+ SCARG(&w4a, pid) = SCARG(uap, pid);
+ SCARG(&w4a, status) = status;
+ SCARG(&w4a, options) = SCARG(uap, options);
+ SCARG(&w4a, rusage) = SCARG(uap, rusage);
+
+ if ((error = wait4(p, &w4a, retval)))
+ return error;
+
+ if ((error = copyin(status, &tstat, sizeof tstat)))
+ return error;
+
+ bsd_to_linux_wstat(&tstat);
+
+ return copyout(&tstat, SCARG(uap, status), sizeof tstat);
+}
+
+/*
+ * This is the old brk(2) call. I don't think anything in the Linux
+ * world uses this anymore
+ */
+int
+linux_break(p, uap, retval)
+ struct proc *p;
+ struct linux_brk_args /* {
+ syscallarg(char *) nsize;
+ } */ *uap;
+ register_t *retval;
+{
+ 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_brk(p, uap, retval)
+ struct proc *p;
+ struct linux_brk_args /* {
+ syscallarg(char *) nsize;
+ } */ *uap;
+ register_t *retval;
+{
+ char *nbrk = SCARG(uap, nsize);
+ struct 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 && 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_time(p, uap, retval)
+ struct proc *p;
+ struct linux_time_args /* {
+ linux_time_t *t;
+ } */ *uap;
+ register_t *retval;
+{
+ 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;
+}
+
+/*
+ * The statfs and fstatfs called are not implemented yet. They're
+ * easy, but just not important for the binaries I wanted to get
+ * running.
+ */
+int
+linux_statfs(p, uap, retval)
+ struct proc *p;
+ struct linux_statfs_args /* {
+ syscallarg(char *) path;
+ syscallarg(struct linux_statfs *) sp;
+ } */ *uap;
+ register_t *retval;
+{
+ return ENOSYS;
+}
+
+int
+linux_fstatfs(p, uap, retval)
+ struct proc *p;
+ struct linux_fstatfs_args /* {
+ syscallarg(char *) path;
+ syscallarg(struct linux_statfs *) sp;
+ } */ *uap;
+ register_t *retval;
+{
+ return ENOSYS;
+}
+
+/*
+ * 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_uname(p, uap, retval)
+ struct proc *p;
+ struct linux_uname_args /* {
+ syscallarg(struct linux_utsname *) up;
+ } */ *uap;
+ register_t *retval;
+{
+ extern char ostype[], osrelease[], version[], hostname[], domainname[];
+ extern char machine[];
+ struct linux_utsname tluts;
+ int len;
+ char *cp;
+
+ strncpy(tluts.l_sysname, ostype, sizeof (tluts.l_sysname));
+ strncpy(tluts.l_nodename, hostname, sizeof (tluts.l_nodename));
+ strncpy(tluts.l_release, osrelease, sizeof (tluts.l_release));
+ strncpy(tluts.l_machine, machine, sizeof (tluts.l_machine));
+ strncpy(tluts.l_domainname, domainname, sizeof (tluts.l_domainname));
+ strncpy(tluts.l_version, version, sizeof (tluts.l_version));
+
+ /* This part taken from the the uname() in libc */
+ len = sizeof (tluts.l_version);
+ for (cp = tluts.l_version; len--; ++cp)
+ if (*cp == '\n' || *cp == '\t')
+ if (len > 1)
+ *cp = ' ';
+ else
+ *cp = '\0';
+
+ return copyout(&tluts, SCARG(uap, up), sizeof tluts);
+}
+
+/*
+ * 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_mmap(p, uap, retval)
+ struct proc *p;
+ struct linux_mmap_args /* {
+ syscallarg(struct linux_mmap *) lmp;
+ } */ *uap;
+ register_t *retval;
+{
+ struct linux_mmap lmap;
+ struct 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 mmap(p, &cma, retval);
+}
+
+/*
+ * Linux doesn't use the retval[1] value to determine whether
+ * we are the child or parent.
+ */
+int
+linux_fork(p, uap, retval)
+ struct proc *p;
+ void *uap;
+ register_t *retval;
+{
+ int error;
+
+ if ((error = fork(p, uap, retval)))
+ return error;
+
+ if (retval[1] == 1)
+ retval[0] = 0;
+
+ return 0;
+}
+
+/*
+ * 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_times(p, uap, retval)
+ struct proc *p;
+ struct linux_times_args /* {
+ syscallarg(struct times *) tms;
+ } */ *uap;
+ register_t *retval;
+{
+ struct timeval t;
+ struct linux_tms ltms;
+ struct rusage ru;
+ int error;
+
+ 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;
+
+ microtime(&t);
+
+ 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_pipe(p, uap, retval)
+ struct proc *p;
+ struct linux_pipe_args /* {
+ syscallarg(int *) pfds;
+ } */ *uap;
+ register_t *retval;
+{
+ int error;
+
+ if ((error = 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 used setitimer(2) in NetBSD.
+ * Fiddle with the timers to make it work.
+ */
+int
+linux_alarm(p, uap, retval)
+ struct proc *p;
+ struct linux_alarm_args /* {
+ syscallarg(unsigned int) secs;
+ } */ *uap;
+ register_t *retval;
+{
+ 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);
+ /*
+ * 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);
+ 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_utime(p, uap, retval)
+ struct proc *p;
+ struct linux_utime_args /* {
+ syscallarg(char *) path;
+ syscallarg(struct linux_utimbuf *)times;
+ } */ *uap;
+ register_t *retval;
+{
+ caddr_t sg;
+ int error;
+ struct utimes_args ua;
+ struct timeval tv[2], *tvp;
+ struct linux_utimbuf lut;
+
+ sg = stackgap_init();
+ CHECK_ALT(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(sizeof tv);
+ if ((error = copyout(tv, tvp, sizeof tv)))
+ return error;
+ SCARG(&ua, tptr) = tvp;
+ }
+ else
+ SCARG(&ua, tptr) = NULL;
+
+ return utimes(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).
+ *
+ * Read in BSD-style entries, convert them, and copy them out.
+ * Note that the Linux d_reclen is actually the name length,
+ * and d_off is the reclen.
+ *
+ * Note that this doesn't handle union-mounted filesystems.
+ */
+int
+linux_readdir(p, uap, retval)
+ struct proc *p;
+ struct linux_readdir_args /* {
+ syscallarg(int) fd;
+ syscallarg(struct linux_dirent *) dent;
+ syscallarg(unsigned int) count;
+ } */ *uap;
+ register_t *retval;
+{
+ 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, linuxreclen; /* Linux-format */
+ struct file *fp;
+ struct uio auio;
+ struct iovec aiov;
+ struct linux_dirent idb;
+ off_t off; /* true file offset */
+ linux_off_t soff; /* Linux file offset */
+ int buflen, error, eofflag, nbytes, justone;
+ struct vattr va;
+
+ 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) { /* Need this for older Linux libs, apparently */
+ nbytes = sizeof (struct linux_dirent);
+ justone = 1;
+ }
+ else
+ justone = 0;
+
+ buflen = max(va.va_blocksize, nbytes);
+ buf = malloc(buflen, 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, (u_long *) 0, 0);
+ if (error)
+ goto out;
+
+ inp = buf;
+ outp = (caddr_t) SCARG(uap, dent);
+ resid = nbytes;
+ if ((len = buflen - auio.uio_resid) == 0)
+ goto eof;
+
+ for (; len > 0; len -= reclen) {
+ reclen = ((struct dirent *) inp)->d_reclen;
+ if (reclen & 3)
+ panic("linux_readdir");
+ off += reclen; /* each entry points to next */
+ bdp = (struct dirent *) inp;
+ if (bdp->d_fileno == 0) {
+ inp += reclen; /* it is a hole; squish it out */
+ continue;
+ }
+ linuxreclen = LINUX_RECLEN(&idb, bdp->d_namlen);
+ if (reclen > len || resid < linuxreclen) {
+ /* 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.l_dino = (long) bdp->d_fileno;
+ idb.l_doff = (linux_off_t) linuxreclen;
+ idb.l_dreclen = (u_short) bdp->d_namlen; /* sigh */
+ strcpy(idb.l_dname, bdp->d_name);
+ if ((error = copyout((caddr_t)&idb, outp, linuxreclen)))
+ goto out;
+ /* advance past this real entry */
+ inp += reclen;
+ /* advance output past Linux-shaped entry */
+ outp += linuxreclen;
+ resid -= linuxreclen;
+ if (justone)
+ 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 (justone)
+ nbytes = resid + linuxreclen;
+
+eof:
+ *retval = nbytes - resid;
+out:
+ VOP_UNLOCK(vp);
+ free(buf, M_TEMP);
+ return error;
+}
+
+/*
+ * Out of register error once more.. Apart from that, no difference.
+ */
+int
+linux_select(p, uap, retval)
+ struct proc *p;
+ struct linux_select_args /* {
+ syscallarg(struct linux_select *) lsp;
+ } */ *uap;
+ register_t *retval;
+{
+ struct linux_select ls;
+ struct select_args bsa;
+ int error;
+
+ if ((error = copyin(SCARG(uap, lsp), (caddr_t) &ls, sizeof ls)))
+ return error;
+
+ SCARG(&bsa, nd) = ls.nfds;
+ SCARG(&bsa, in) = ls.readfds;
+ SCARG(&bsa, ou) = ls.writefds;
+ SCARG(&bsa, ex) = ls.exceptfds;
+ SCARG(&bsa, tv) = ls.timeout;
+
+ return select(p, &bsa, retval);
+}
+
+/*
+ * Get the process group of a certain process. Look it up
+ * and return the value.
+ */
+int
+linux_getpgid(p, uap, retval)
+ struct proc *p;
+ struct linux_getpgid_args /* {
+ syscallarg(int) pid;
+ } */ *uap;
+ register_t *retval;
+{
+ 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;
+}