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fexecve implementation for Linux.

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This commit is contained in:
Ulrich Drepper 2002-11-04 19:52:27 +00:00
parent 2b55ae94a2
commit c63c4215f1
1 changed files with 58 additions and 0 deletions
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58
sysdeps/unix/sysv/linux/fexecve.c Normal file
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/* Copyright (C) 1994, 1995, 1996, 1997, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <stddef.h>
#include <unistd.h>
#include <sys/stat.h>
/* Execute the file FD refers to, overlaying the running program image.
ARGV and ENVP are passed to the new program, as for `execve'. */
int
fexecve (fd, argv, envp)
int fd;
char *const argv[];
char *const envp[];
{
if (fd < 0 || argv == NULL || envp == NULL)
{
__set_errno (EINVAL);
return -1;
}
/* We use the /proc filesystem to get the information. If it is not
mounted we fail. */
char buf[sizeof "/proc/self/fd/" + sizeof (int) * 3];
snprintf (buf, sizeof (buf), "/proc/self/fd/%d", fd);
/* We do not need the return value. */
execve (buf, argv, envp);
int save = errno;
/* We come here only if the 'execve' call fails. Determine whether
/proc is mounted. If not we return ENOSYS. */
struct stat st;
if (stat ("/proc/self/fd", &st) != 0 && errno == ENOENT)
save = ENOSYS;
__set_errno (save);
return -1;
}