778 lines
19 KiB
C
778 lines
19 KiB
C
/* Utilities to execute a program in a subprocess (possibly linked by pipes
|
|
with other subprocesses), and wait for it. Generic Unix version
|
|
(also used for UWIN and VMS).
|
|
Copyright (C) 1996-2018 Free Software Foundation, Inc.
|
|
|
|
This file is part of the libiberty library.
|
|
Libiberty is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
Libiberty is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with libiberty; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
#include "config.h"
|
|
#include "libiberty.h"
|
|
#include "pex-common.h"
|
|
#include "environ.h"
|
|
|
|
#include <stdio.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#ifdef NEED_DECLARATION_ERRNO
|
|
extern int errno;
|
|
#endif
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h>
|
|
#endif
|
|
#ifdef HAVE_STRING_H
|
|
#include <string.h>
|
|
#endif
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
|
|
#ifdef HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_WAIT_H
|
|
#include <sys/wait.h>
|
|
#endif
|
|
#ifdef HAVE_GETRUSAGE
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_STAT_H
|
|
#include <sys/stat.h>
|
|
#endif
|
|
#ifdef HAVE_PROCESS_H
|
|
#include <process.h>
|
|
#endif
|
|
|
|
#ifdef vfork /* Autoconf may define this to fork for us. */
|
|
# define VFORK_STRING "fork"
|
|
#else
|
|
# define VFORK_STRING "vfork"
|
|
#endif
|
|
#ifdef HAVE_VFORK_H
|
|
#include <vfork.h>
|
|
#endif
|
|
#if defined(VMS) && defined (__LONG_POINTERS)
|
|
#ifndef __CHAR_PTR32
|
|
typedef char * __char_ptr32
|
|
__attribute__ ((mode (SI)));
|
|
#endif
|
|
|
|
typedef __char_ptr32 *__char_ptr_char_ptr32
|
|
__attribute__ ((mode (SI)));
|
|
|
|
/* Return a 32 bit pointer to an array of 32 bit pointers
|
|
given a 64 bit pointer to an array of 64 bit pointers. */
|
|
|
|
static __char_ptr_char_ptr32
|
|
to_ptr32 (char **ptr64)
|
|
{
|
|
int argc;
|
|
__char_ptr_char_ptr32 short_argv;
|
|
|
|
/* Count number of arguments. */
|
|
for (argc = 0; ptr64[argc] != NULL; argc++)
|
|
;
|
|
|
|
/* Reallocate argv with 32 bit pointers. */
|
|
short_argv = (__char_ptr_char_ptr32) decc$malloc
|
|
(sizeof (__char_ptr32) * (argc + 1));
|
|
|
|
for (argc = 0; ptr64[argc] != NULL; argc++)
|
|
short_argv[argc] = (__char_ptr32) decc$strdup (ptr64[argc]);
|
|
|
|
short_argv[argc] = (__char_ptr32) 0;
|
|
return short_argv;
|
|
|
|
}
|
|
#else
|
|
#define to_ptr32(argv) argv
|
|
#endif
|
|
|
|
/* File mode to use for private and world-readable files. */
|
|
|
|
#if defined (S_IRUSR) && defined (S_IWUSR) && defined (S_IRGRP) && defined (S_IWGRP) && defined (S_IROTH) && defined (S_IWOTH)
|
|
#define PUBLIC_MODE \
|
|
(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
|
|
#else
|
|
#define PUBLIC_MODE 0666
|
|
#endif
|
|
|
|
/* Get the exit status of a particular process, and optionally get the
|
|
time that it took. This is simple if we have wait4, slightly
|
|
harder if we have waitpid, and is a pain if we only have wait. */
|
|
|
|
static pid_t pex_wait (struct pex_obj *, pid_t, int *, struct pex_time *);
|
|
|
|
#ifdef HAVE_WAIT4
|
|
|
|
static pid_t
|
|
pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
|
|
struct pex_time *time)
|
|
{
|
|
pid_t ret;
|
|
struct rusage r;
|
|
|
|
#ifdef HAVE_WAITPID
|
|
if (time == NULL)
|
|
return waitpid (pid, status, 0);
|
|
#endif
|
|
|
|
ret = wait4 (pid, status, 0, &r);
|
|
|
|
if (time != NULL)
|
|
{
|
|
time->user_seconds = r.ru_utime.tv_sec;
|
|
time->user_microseconds= r.ru_utime.tv_usec;
|
|
time->system_seconds = r.ru_stime.tv_sec;
|
|
time->system_microseconds= r.ru_stime.tv_usec;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else /* ! defined (HAVE_WAIT4) */
|
|
|
|
#ifdef HAVE_WAITPID
|
|
|
|
#ifndef HAVE_GETRUSAGE
|
|
|
|
static pid_t
|
|
pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
|
|
struct pex_time *time)
|
|
{
|
|
if (time != NULL)
|
|
memset (time, 0, sizeof (struct pex_time));
|
|
return waitpid (pid, status, 0);
|
|
}
|
|
|
|
#else /* defined (HAVE_GETRUSAGE) */
|
|
|
|
static pid_t
|
|
pex_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, pid_t pid, int *status,
|
|
struct pex_time *time)
|
|
{
|
|
struct rusage r1, r2;
|
|
pid_t ret;
|
|
|
|
if (time == NULL)
|
|
return waitpid (pid, status, 0);
|
|
|
|
getrusage (RUSAGE_CHILDREN, &r1);
|
|
|
|
ret = waitpid (pid, status, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
getrusage (RUSAGE_CHILDREN, &r2);
|
|
|
|
time->user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec;
|
|
time->user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec;
|
|
if (r2.ru_utime.tv_usec < r1.ru_utime.tv_usec)
|
|
{
|
|
--time->user_seconds;
|
|
time->user_microseconds += 1000000;
|
|
}
|
|
|
|
time->system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec;
|
|
time->system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec;
|
|
if (r2.ru_stime.tv_usec < r1.ru_stime.tv_usec)
|
|
{
|
|
--time->system_seconds;
|
|
time->system_microseconds += 1000000;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* defined (HAVE_GETRUSAGE) */
|
|
|
|
#else /* ! defined (HAVE_WAITPID) */
|
|
|
|
struct status_list
|
|
{
|
|
struct status_list *next;
|
|
pid_t pid;
|
|
int status;
|
|
struct pex_time time;
|
|
};
|
|
|
|
static pid_t
|
|
pex_wait (struct pex_obj *obj, pid_t pid, int *status, struct pex_time *time)
|
|
{
|
|
struct status_list **pp;
|
|
|
|
for (pp = (struct status_list **) &obj->sysdep;
|
|
*pp != NULL;
|
|
pp = &(*pp)->next)
|
|
{
|
|
if ((*pp)->pid == pid)
|
|
{
|
|
struct status_list *p;
|
|
|
|
p = *pp;
|
|
*status = p->status;
|
|
if (time != NULL)
|
|
*time = p->time;
|
|
*pp = p->next;
|
|
free (p);
|
|
return pid;
|
|
}
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
pid_t cpid;
|
|
struct status_list *psl;
|
|
struct pex_time pt;
|
|
#ifdef HAVE_GETRUSAGE
|
|
struct rusage r1, r2;
|
|
#endif
|
|
|
|
if (time != NULL)
|
|
{
|
|
#ifdef HAVE_GETRUSAGE
|
|
getrusage (RUSAGE_CHILDREN, &r1);
|
|
#else
|
|
memset (&pt, 0, sizeof (struct pex_time));
|
|
#endif
|
|
}
|
|
|
|
cpid = wait (status);
|
|
|
|
#ifdef HAVE_GETRUSAGE
|
|
if (time != NULL && cpid >= 0)
|
|
{
|
|
getrusage (RUSAGE_CHILDREN, &r2);
|
|
|
|
pt.user_seconds = r2.ru_utime.tv_sec - r1.ru_utime.tv_sec;
|
|
pt.user_microseconds = r2.ru_utime.tv_usec - r1.ru_utime.tv_usec;
|
|
if (pt.user_microseconds < 0)
|
|
{
|
|
--pt.user_seconds;
|
|
pt.user_microseconds += 1000000;
|
|
}
|
|
|
|
pt.system_seconds = r2.ru_stime.tv_sec - r1.ru_stime.tv_sec;
|
|
pt.system_microseconds = r2.ru_stime.tv_usec - r1.ru_stime.tv_usec;
|
|
if (pt.system_microseconds < 0)
|
|
{
|
|
--pt.system_seconds;
|
|
pt.system_microseconds += 1000000;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (cpid < 0 || cpid == pid)
|
|
{
|
|
if (time != NULL)
|
|
*time = pt;
|
|
return cpid;
|
|
}
|
|
|
|
psl = XNEW (struct status_list);
|
|
psl->pid = cpid;
|
|
psl->status = *status;
|
|
if (time != NULL)
|
|
psl->time = pt;
|
|
psl->next = (struct status_list *) obj->sysdep;
|
|
obj->sysdep = (void *) psl;
|
|
}
|
|
}
|
|
|
|
#endif /* ! defined (HAVE_WAITPID) */
|
|
#endif /* ! defined (HAVE_WAIT4) */
|
|
|
|
static int pex_unix_open_read (struct pex_obj *, const char *, int);
|
|
static int pex_unix_open_write (struct pex_obj *, const char *, int, int);
|
|
static pid_t pex_unix_exec_child (struct pex_obj *, int, const char *,
|
|
char * const *, char * const *,
|
|
int, int, int, int,
|
|
const char **, int *);
|
|
static int pex_unix_close (struct pex_obj *, int);
|
|
static int pex_unix_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
|
|
int, const char **, int *);
|
|
static int pex_unix_pipe (struct pex_obj *, int *, int);
|
|
static FILE *pex_unix_fdopenr (struct pex_obj *, int, int);
|
|
static FILE *pex_unix_fdopenw (struct pex_obj *, int, int);
|
|
static void pex_unix_cleanup (struct pex_obj *);
|
|
|
|
/* The list of functions we pass to the common routines. */
|
|
|
|
const struct pex_funcs funcs =
|
|
{
|
|
pex_unix_open_read,
|
|
pex_unix_open_write,
|
|
pex_unix_exec_child,
|
|
pex_unix_close,
|
|
pex_unix_wait,
|
|
pex_unix_pipe,
|
|
pex_unix_fdopenr,
|
|
pex_unix_fdopenw,
|
|
pex_unix_cleanup
|
|
};
|
|
|
|
/* Return a newly initialized pex_obj structure. */
|
|
|
|
struct pex_obj *
|
|
pex_init (int flags, const char *pname, const char *tempbase)
|
|
{
|
|
return pex_init_common (flags, pname, tempbase, &funcs);
|
|
}
|
|
|
|
/* Open a file for reading. */
|
|
|
|
static int
|
|
pex_unix_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
|
|
int binary ATTRIBUTE_UNUSED)
|
|
{
|
|
return open (name, O_RDONLY);
|
|
}
|
|
|
|
/* Open a file for writing. */
|
|
|
|
static int
|
|
pex_unix_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
|
|
int binary ATTRIBUTE_UNUSED, int append)
|
|
{
|
|
/* Note that we can't use O_EXCL here because gcc may have already
|
|
created the temporary file via make_temp_file. */
|
|
return open (name, O_WRONLY | O_CREAT
|
|
| (append ? O_APPEND : O_TRUNC), PUBLIC_MODE);
|
|
}
|
|
|
|
/* Close a file. */
|
|
|
|
static int
|
|
pex_unix_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
|
|
{
|
|
return close (fd);
|
|
}
|
|
|
|
/* Execute a child. */
|
|
|
|
#if defined(HAVE_SPAWNVE) && defined(HAVE_SPAWNVPE)
|
|
/* Implementation of pex->exec_child using the Cygwin spawn operation. */
|
|
|
|
/* Subroutine of pex_unix_exec_child. Move OLD_FD to a new file descriptor
|
|
to be stored in *PNEW_FD, save the flags in *PFLAGS, and arrange for the
|
|
saved copy to be close-on-exec. Move CHILD_FD into OLD_FD. If CHILD_FD
|
|
is -1, OLD_FD is to be closed. Return -1 on error. */
|
|
|
|
static int
|
|
save_and_install_fd(int *pnew_fd, int *pflags, int old_fd, int child_fd)
|
|
{
|
|
int new_fd, flags;
|
|
|
|
flags = fcntl (old_fd, F_GETFD);
|
|
|
|
/* If we could not retrieve the flags, then OLD_FD was not open. */
|
|
if (flags < 0)
|
|
{
|
|
new_fd = -1, flags = 0;
|
|
if (child_fd >= 0 && dup2 (child_fd, old_fd) < 0)
|
|
return -1;
|
|
}
|
|
/* If we wish to close OLD_FD, just mark it CLOEXEC. */
|
|
else if (child_fd == -1)
|
|
{
|
|
new_fd = old_fd;
|
|
if ((flags & FD_CLOEXEC) == 0 && fcntl (old_fd, F_SETFD, FD_CLOEXEC) < 0)
|
|
return -1;
|
|
}
|
|
/* Otherwise we need to save a copy of OLD_FD before installing CHILD_FD. */
|
|
else
|
|
{
|
|
#ifdef F_DUPFD_CLOEXEC
|
|
new_fd = fcntl (old_fd, F_DUPFD_CLOEXEC, 3);
|
|
if (new_fd < 0)
|
|
return -1;
|
|
#else
|
|
/* Prefer F_DUPFD over dup in order to avoid getting a new fd
|
|
in the range 0-2, right where a new stderr fd might get put. */
|
|
new_fd = fcntl (old_fd, F_DUPFD, 3);
|
|
if (new_fd < 0)
|
|
return -1;
|
|
if (fcntl (new_fd, F_SETFD, FD_CLOEXEC) < 0)
|
|
return -1;
|
|
#endif
|
|
if (dup2 (child_fd, old_fd) < 0)
|
|
return -1;
|
|
}
|
|
|
|
*pflags = flags;
|
|
if (pnew_fd)
|
|
*pnew_fd = new_fd;
|
|
else if (new_fd != old_fd)
|
|
abort ();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Subroutine of pex_unix_exec_child. Move SAVE_FD back to OLD_FD
|
|
restoring FLAGS. If SAVE_FD < 0, OLD_FD is to be closed. */
|
|
|
|
static int
|
|
restore_fd(int old_fd, int save_fd, int flags)
|
|
{
|
|
/* For SAVE_FD < 0, all we have to do is restore the
|
|
"closed-ness" of the original. */
|
|
if (save_fd < 0)
|
|
return close (old_fd);
|
|
|
|
/* For SAVE_FD == OLD_FD, all we have to do is restore the
|
|
original setting of the CLOEXEC flag. */
|
|
if (save_fd == old_fd)
|
|
{
|
|
if (flags & FD_CLOEXEC)
|
|
return 0;
|
|
return fcntl (old_fd, F_SETFD, flags);
|
|
}
|
|
|
|
/* Otherwise we have to move the descriptor back, restore the flags,
|
|
and close the saved copy. */
|
|
#ifdef HAVE_DUP3
|
|
if (flags == FD_CLOEXEC)
|
|
{
|
|
if (dup3 (save_fd, old_fd, O_CLOEXEC) < 0)
|
|
return -1;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if (dup2 (save_fd, old_fd) < 0)
|
|
return -1;
|
|
if (flags != 0 && fcntl (old_fd, F_SETFD, flags) < 0)
|
|
return -1;
|
|
}
|
|
return close (save_fd);
|
|
}
|
|
|
|
static pid_t
|
|
pex_unix_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED,
|
|
int flags, const char *executable,
|
|
char * const * argv, char * const * env,
|
|
int in, int out, int errdes, int toclose,
|
|
const char **errmsg, int *err)
|
|
{
|
|
int fl_in = 0, fl_out = 0, fl_err = 0, fl_tc = 0;
|
|
int save_in = -1, save_out = -1, save_err = -1;
|
|
int max, retries;
|
|
pid_t pid;
|
|
|
|
if (flags & PEX_STDERR_TO_STDOUT)
|
|
errdes = out;
|
|
|
|
/* We need the three standard file descriptors to be set up as for
|
|
the child before we perform the spawn. The file descriptors for
|
|
the parent need to be moved and marked for close-on-exec. */
|
|
if (in != STDIN_FILE_NO
|
|
&& save_and_install_fd (&save_in, &fl_in, STDIN_FILE_NO, in) < 0)
|
|
goto error_dup2;
|
|
if (out != STDOUT_FILE_NO
|
|
&& save_and_install_fd (&save_out, &fl_out, STDOUT_FILE_NO, out) < 0)
|
|
goto error_dup2;
|
|
if (errdes != STDERR_FILE_NO
|
|
&& save_and_install_fd (&save_err, &fl_err, STDERR_FILE_NO, errdes) < 0)
|
|
goto error_dup2;
|
|
if (toclose >= 0
|
|
&& save_and_install_fd (NULL, &fl_tc, toclose, -1) < 0)
|
|
goto error_dup2;
|
|
|
|
/* Now that we've moved the file descriptors for the child into place,
|
|
close the originals. Be careful not to close any of the standard
|
|
file descriptors that we just set up. */
|
|
max = -1;
|
|
if (errdes >= 0)
|
|
max = STDERR_FILE_NO;
|
|
else if (out >= 0)
|
|
max = STDOUT_FILE_NO;
|
|
else if (in >= 0)
|
|
max = STDIN_FILE_NO;
|
|
if (in > max)
|
|
close (in);
|
|
if (out > max)
|
|
close (out);
|
|
if (errdes > max && errdes != out)
|
|
close (errdes);
|
|
|
|
/* If we were not given an environment, use the global environment. */
|
|
if (env == NULL)
|
|
env = environ;
|
|
|
|
/* Launch the program. If we get EAGAIN (normally out of pid's), try
|
|
again a few times with increasing backoff times. */
|
|
retries = 0;
|
|
while (1)
|
|
{
|
|
typedef const char * const *cc_cp;
|
|
|
|
if (flags & PEX_SEARCH)
|
|
pid = spawnvpe (_P_NOWAITO, executable, (cc_cp)argv, (cc_cp)env);
|
|
else
|
|
pid = spawnve (_P_NOWAITO, executable, (cc_cp)argv, (cc_cp)env);
|
|
|
|
if (pid > 0)
|
|
break;
|
|
|
|
*err = errno;
|
|
*errmsg = "spawn";
|
|
if (errno != EAGAIN || ++retries == 4)
|
|
return (pid_t) -1;
|
|
sleep (1 << retries);
|
|
}
|
|
|
|
/* Success. Restore the parent's file descriptors that we saved above. */
|
|
if (toclose >= 0
|
|
&& restore_fd (toclose, toclose, fl_tc) < 0)
|
|
goto error_dup2;
|
|
if (in != STDIN_FILE_NO
|
|
&& restore_fd (STDIN_FILE_NO, save_in, fl_in) < 0)
|
|
goto error_dup2;
|
|
if (out != STDOUT_FILE_NO
|
|
&& restore_fd (STDOUT_FILE_NO, save_out, fl_out) < 0)
|
|
goto error_dup2;
|
|
if (errdes != STDERR_FILE_NO
|
|
&& restore_fd (STDERR_FILE_NO, save_err, fl_err) < 0)
|
|
goto error_dup2;
|
|
|
|
return pid;
|
|
|
|
error_dup2:
|
|
*err = errno;
|
|
*errmsg = "dup2";
|
|
return (pid_t) -1;
|
|
}
|
|
|
|
#else
|
|
/* Implementation of pex->exec_child using standard vfork + exec. */
|
|
|
|
static pid_t
|
|
pex_unix_exec_child (struct pex_obj *obj, int flags, const char *executable,
|
|
char * const * argv, char * const * env,
|
|
int in, int out, int errdes,
|
|
int toclose, const char **errmsg, int *err)
|
|
{
|
|
pid_t pid = -1;
|
|
|
|
/* We declare these to be volatile to avoid warnings from gcc about
|
|
them being clobbered by vfork. */
|
|
volatile int sleep_interval = 1;
|
|
volatile int retries;
|
|
|
|
/* We vfork and then set environ in the child before calling execvp.
|
|
This clobbers the parent's environ so we need to restore it.
|
|
It would be nice to use one of the exec* functions that takes an
|
|
environment as a parameter, but that may have portability
|
|
issues. */
|
|
char **save_environ = environ;
|
|
|
|
for (retries = 0; retries < 4; ++retries)
|
|
{
|
|
pid = vfork ();
|
|
if (pid >= 0)
|
|
break;
|
|
sleep (sleep_interval);
|
|
sleep_interval *= 2;
|
|
}
|
|
|
|
switch (pid)
|
|
{
|
|
case -1:
|
|
*err = errno;
|
|
*errmsg = VFORK_STRING;
|
|
return (pid_t) -1;
|
|
|
|
case 0:
|
|
/* Child process. */
|
|
{
|
|
const char *bad_fn = NULL;
|
|
|
|
if (!bad_fn && in != STDIN_FILE_NO)
|
|
{
|
|
if (dup2 (in, STDIN_FILE_NO) < 0)
|
|
bad_fn = "dup2";
|
|
else if (close (in) < 0)
|
|
bad_fn = "close";
|
|
}
|
|
if (!bad_fn && out != STDOUT_FILE_NO)
|
|
{
|
|
if (dup2 (out, STDOUT_FILE_NO) < 0)
|
|
bad_fn = "dup2";
|
|
else if (close (out) < 0)
|
|
bad_fn = "close";
|
|
}
|
|
if (!bad_fn && errdes != STDERR_FILE_NO)
|
|
{
|
|
if (dup2 (errdes, STDERR_FILE_NO) < 0)
|
|
bad_fn = "dup2";
|
|
else if (close (errdes) < 0)
|
|
bad_fn = "close";
|
|
}
|
|
if (!bad_fn && toclose >= 0)
|
|
{
|
|
if (close (toclose) < 0)
|
|
bad_fn = "close";
|
|
}
|
|
if (!bad_fn && (flags & PEX_STDERR_TO_STDOUT) != 0)
|
|
{
|
|
if (dup2 (STDOUT_FILE_NO, STDERR_FILE_NO) < 0)
|
|
bad_fn = "dup2";
|
|
}
|
|
if (!bad_fn)
|
|
{
|
|
if (env)
|
|
/* NOTE: In a standard vfork implementation this clobbers
|
|
the parent's copy of environ "too" (in reality there's
|
|
only one copy). This is ok as we restore it below. */
|
|
environ = (char**) env;
|
|
if ((flags & PEX_SEARCH) != 0)
|
|
{
|
|
execvp (executable, to_ptr32 (argv));
|
|
bad_fn = "execvp";
|
|
}
|
|
else
|
|
{
|
|
execv (executable, to_ptr32 (argv));
|
|
bad_fn = "execv";
|
|
}
|
|
}
|
|
|
|
/* Something failed, report an error. We don't use stdio
|
|
routines, because we might be here due to a vfork call. */
|
|
ssize_t retval = 0;
|
|
int eno = errno;
|
|
|
|
#define writeerr(s) (retval |= write (STDERR_FILE_NO, s, strlen (s)))
|
|
writeerr (obj->pname);
|
|
writeerr (": error trying to exec '");
|
|
writeerr (executable);
|
|
writeerr ("': ");
|
|
writeerr (bad_fn);
|
|
writeerr (": ");
|
|
writeerr (xstrerror (eno));
|
|
writeerr ("\n");
|
|
#undef writeerr
|
|
|
|
/* Exit with -2 if the error output failed, too. */
|
|
_exit (retval < 0 ? -2 : -1);
|
|
}
|
|
/* NOTREACHED */
|
|
return (pid_t) -1;
|
|
|
|
default:
|
|
/* Parent process. */
|
|
{
|
|
const char *bad_fn = NULL;
|
|
|
|
/* Restore environ. Note that the parent either doesn't run
|
|
until the child execs/exits (standard vfork behaviour), or
|
|
if it does run then vfork is behaving more like fork. In
|
|
either case we needn't worry about clobbering the child's
|
|
copy of environ. */
|
|
environ = save_environ;
|
|
|
|
if (!bad_fn && in != STDIN_FILE_NO)
|
|
if (close (in) < 0)
|
|
bad_fn = "close";
|
|
if (!bad_fn && out != STDOUT_FILE_NO)
|
|
if (close (out) < 0)
|
|
bad_fn = "close";
|
|
if (!bad_fn && errdes != STDERR_FILE_NO)
|
|
if (close (errdes) < 0)
|
|
bad_fn = "close";
|
|
|
|
if (bad_fn)
|
|
{
|
|
*err = errno;
|
|
*errmsg = bad_fn;
|
|
return (pid_t) -1;
|
|
}
|
|
}
|
|
|
|
return pid;
|
|
}
|
|
}
|
|
#endif /* SPAWN */
|
|
|
|
/* Wait for a child process to complete. */
|
|
|
|
static int
|
|
pex_unix_wait (struct pex_obj *obj, pid_t pid, int *status,
|
|
struct pex_time *time, int done, const char **errmsg,
|
|
int *err)
|
|
{
|
|
/* If we are cleaning up when the caller didn't retrieve process
|
|
status for some reason, encourage the process to go away. */
|
|
if (done)
|
|
kill (pid, SIGTERM);
|
|
|
|
if (pex_wait (obj, pid, status, time) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "wait";
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Create a pipe. */
|
|
|
|
static int
|
|
pex_unix_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p,
|
|
int binary ATTRIBUTE_UNUSED)
|
|
{
|
|
return pipe (p);
|
|
}
|
|
|
|
/* Get a FILE pointer to read from a file descriptor. */
|
|
|
|
static FILE *
|
|
pex_unix_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
|
|
int binary ATTRIBUTE_UNUSED)
|
|
{
|
|
return fdopen (fd, "r");
|
|
}
|
|
|
|
static FILE *
|
|
pex_unix_fdopenw (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
|
|
int binary ATTRIBUTE_UNUSED)
|
|
{
|
|
if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
|
|
return NULL;
|
|
return fdopen (fd, "w");
|
|
}
|
|
|
|
static void
|
|
pex_unix_cleanup (struct pex_obj *obj ATTRIBUTE_UNUSED)
|
|
{
|
|
#if !defined (HAVE_WAIT4) && !defined (HAVE_WAITPID)
|
|
while (obj->sysdep != NULL)
|
|
{
|
|
struct status_list *this;
|
|
struct status_list *next;
|
|
|
|
this = (struct status_list *) obj->sysdep;
|
|
next = this->next;
|
|
free (this);
|
|
obj->sysdep = (void *) next;
|
|
}
|
|
#endif
|
|
}
|