c23e7c1c58
Both (F_OK|X_OK) cannot be tested at the same time, which means that X_OK is X_OK for directories, too. And anyway there's a huge period of time between X_OK test and exec. So I remove the test which cannot be performed reliably. As a bonus, I also replace execv() with execvp().
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
|
|
Copyright (C) 2001 Dmitry V. Levin <ldv@altlinux.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <error.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
|
|
extern const char *__progname;
|
|
|
|
static void
|
|
my_error_print_progname (void)
|
|
{
|
|
fflush (stdout);
|
|
fprintf (stderr, "%s: ", __progname);
|
|
}
|
|
|
|
__attribute__ ((__noreturn__))
|
|
static void usage (void)
|
|
{
|
|
fprintf (stderr, "usage: %s <pid> <command>\n", __progname);
|
|
exit (EXIT_FAILURE);
|
|
}
|
|
|
|
static void
|
|
wait_for_pdeath (pid_t pid)
|
|
{
|
|
for (;;)
|
|
{
|
|
if (kill (pid, 0) < 0)
|
|
{
|
|
if (ESRCH == errno)
|
|
break;
|
|
else
|
|
error (EXIT_FAILURE, errno, "kill: %u", pid);
|
|
}
|
|
usleep (100000);
|
|
}
|
|
}
|
|
|
|
int
|
|
main (int ac, char *const *av)
|
|
{
|
|
pid_t pid;
|
|
|
|
error_print_progname = my_error_print_progname;
|
|
|
|
if (ac < 3)
|
|
usage ();
|
|
|
|
pid = atoi (av[1]);
|
|
|
|
/*
|
|
* Check arguments.
|
|
*/
|
|
|
|
if (pid <= 1)
|
|
usage ();
|
|
|
|
if (kill (pid, 0) < 0)
|
|
error (EXIT_FAILURE, errno, "kill: %u", pid);
|
|
|
|
/* Lets parent go on. */
|
|
if (daemon (1, 1) < 0)
|
|
error (EXIT_FAILURE, errno, "daemon");
|
|
|
|
/* Wait for parent completion. */
|
|
wait_for_pdeath (pid);
|
|
|
|
execvp (av[2], av + 2);
|
|
error (EXIT_FAILURE, errno, "execv: %s", av[2]);
|
|
return EXIT_FAILURE;
|
|
}
|