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authorUlrich Drepper <drepper@redhat.com>2002-11-04 19:52:27 +0000
committerUlrich Drepper <drepper@redhat.com>2002-11-04 19:52:27 +0000
commitc63c4215f18f25eb7f87873b73df940c02931365 (patch)
tree3a740a8f211a80eb8c5495469693d0925462b072 /sysdeps
parent2b55ae94a2e7ff6a3f1bd05ccdb042a98caf1513 (diff)
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fexecve implementation for Linux.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/fexecve.c58
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;
+}