On Wed, 2006-12-27 at 00:51 -0500, Rob Landley wrote:
> On Wednesday 27 December 2006 12:13 am, Ray Lee wrote:
> > How about openning an fd to yourself at the beginning of execution, then
> > calling fexecve later?
>
> I haven't got a man page for fexecve. Does libc have it?
It's implemented inside glibc, and uses /proc to execve() the file that
the fd points to. Here's the code from
sysdeps/unix/sysv/linux/fexecve.c:
fexecve (fd, argv, envp)
int fd;
char *const argv[];
char *const envp[];
{
...
/* 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);
...
}
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