Re: Feature request: exec self for NOMMU.

From: Vadim Lobanov
Date: Wed Dec 27 2006 - 01:09:23 EST

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

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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