From 7031f62d9b750568b5e98bdb8c59c3c1a72e073d Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Mon, 8 May 2006 03:20:50 +0000 Subject: add back in udhcp support --- networking/udhcp/pidfile.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 networking/udhcp/pidfile.c (limited to 'networking/udhcp/pidfile.c') diff --git a/networking/udhcp/pidfile.c b/networking/udhcp/pidfile.c new file mode 100644 index 000000000..7a956fb47 --- /dev/null +++ b/networking/udhcp/pidfile.c @@ -0,0 +1,75 @@ +/* pidfile.c + * + * Functions to assist in the writing and removing of pidfiles. + * + * Russ Dill September 2001 + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include +#include +#include +#include +#include +#include + +#include "common.h" +#include "pidfile.h" + +static char *saved_pidfile; + +static void pidfile_delete(void) +{ + if (saved_pidfile) unlink(saved_pidfile); +} + + +int pidfile_acquire(const char *pidfile) +{ + int pid_fd; + if (!pidfile) return -1; + + pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644); + if (pid_fd < 0) { + LOG(LOG_ERR, "Unable to open pidfile %s: %m\n", pidfile); + } else { + lockf(pid_fd, F_LOCK, 0); + if (!saved_pidfile) + atexit(pidfile_delete); + saved_pidfile = (char *) pidfile; + } + + return pid_fd; +} + + +void pidfile_write_release(int pid_fd) +{ + FILE *out; + + if (pid_fd < 0) return; + + if ((out = fdopen(pid_fd, "w")) != NULL) { + fprintf(out, "%d\n", getpid()); + fclose(out); + } + lockf(pid_fd, F_UNLCK, 0); + close(pid_fd); +} + + + + -- cgit v1.2.3