96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
/*
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$Id$
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Copyright (C) 2001 Dmitry V. Levin <ldv@fandra.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <error.h>
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#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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extern const char *__progname;
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static void
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my_error_print_progname (void)
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{
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fflush (stdout);
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fprintf (stderr, "%s: ", __progname);
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}
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__attribute__ ((__noreturn__))
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static void usage (void)
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{
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fprintf (stderr, "usage: %s <pid> <command>\n", __progname);
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exit (EXIT_FAILURE);
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}
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static void
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wait_for_pdeath (pid_t pid)
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{
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for (;;)
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{
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if (kill (pid, 0) < 0)
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{
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if (ESRCH == errno)
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break;
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else
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error (EXIT_FAILURE, errno, "kill: %u", pid);
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}
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usleep (100000);
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}
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}
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int
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main (int ac, char *const *av)
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{
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pid_t pid;
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error_print_progname = my_error_print_progname;
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if (ac < 3)
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usage ();
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pid = atoi (av[1]);
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/*
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* Check arguments.
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*/
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if (pid <= 1)
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usage ();
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if (kill (pid, 0) < 0)
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error (EXIT_FAILURE, errno, "kill: %u", pid);
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if (access (av[2], X_OK))
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error (EXIT_FAILURE, errno, "access: %s", av[2]);
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/* Lets parent go on. */
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if (daemon (1, 1) < 0)
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error (EXIT_FAILURE, errno, "daemon");
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/* Wait for parent completion. */
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wait_for_pdeath (pid);
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execv (av[2], av + 2);
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error (EXIT_FAILURE, errno, "execv: %s", av[2]);
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return EXIT_FAILURE;
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}
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