diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/fexecve.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/fexecve.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/fexecve.c b/sysdeps/unix/sysv/linux/fexecve.c new file mode 100644 index 0000000000..dbf56907bb --- /dev/null +++ b/sysdeps/unix/sysv/linux/fexecve.c @@ -0,0 +1,58 @@ +/* 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; +} |