From a74d37ae613020bbdda3c5a5a8af95e9a1cbedbd Mon Sep 17 00:00:00 2001
From: Mark Grondona <mgrondona@llnl.gov>
Date: Fri, 2 Aug 2002 16:34:00 +0000
Subject: [PATCH] o check in simple daemonize code for slurm daemons
---
src/common/daemonize.c | 81 ++++++++++++++++++++++++++++++++++++++++++
src/common/daemonize.h | 16 +++++++++
2 files changed, 97 insertions(+)
create mode 100644 src/common/daemonize.c
create mode 100644 src/common/daemonize.h
diff --git a/src/common/daemonize.c b/src/common/daemonize.c
new file mode 100644
index 00000000000..c1e95a73f34
--- /dev/null
+++ b/src/common/daemonize.c
@@ -0,0 +1,81 @@
+/*****************************************************************************\
+ * daemonize.c - daemonization routine
+ *****************************************************************************
+ * Copyright (C) 2002 The Regents of the University of California.
+ * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ * Written by Mark A. Grondona <mgrondona@llnl.gov>.
+ * UCRL-CODE-2002-040.
+ *
+ * This file is part of SLURM, a resource management program.
+ * For details, see <http://www.llnl.gov/linux/slurm/>.
+ *
+ * SLURM 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.
+ *
+ * SLURM 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 SLURM; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+\*****************************************************************************/
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <unistd.h>
+
+#include <src/common/macros.h>
+#include <src/common/log.h>
+
+/* closeall FDs >= a specified value */
+static void
+closeall(int fd)
+{
+ int fdlimit = sysconf(_SC_OPEN_MAX);
+
+ while (fd < fdlimit)
+ close(fd++);
+}
+
+/* detach and go into background.
+ * caller is responsible for umasks
+ *
+ * if chdir != 0, will do a chdir to /
+ * if noclose == 0, will close all FDs
+ */
+int
+daemon(int nochdir, int noclose)
+{
+ switch (fork()) {
+ case 0 : break; /* child */
+ case -1 : return -1;
+ default : _exit(0); /* exit parent */
+ }
+
+ if (setsid() < 0)
+ return -1;
+
+ switch (fork()) {
+ case 0 : break; /* child */
+ case -1: return -1;
+ default: _exit(0); /* exit parent */
+ }
+
+ if(!nochdir && chdir("/") < 0)
+ fatal("chdir(/): %m");
+
+ if (!noclose) {
+ closeall(0);
+ open("/dev/null", O_RDWR);
+ dup(0);
+ dup(0);
+ }
+ return 0;
+
+}
diff --git a/src/common/daemonize.h b/src/common/daemonize.h
new file mode 100644
index 00000000000..a802763c2b8
--- /dev/null
+++ b/src/common/daemonize.h
@@ -0,0 +1,16 @@
+/* src/common/daemonize.h
+ * $Id$
+ */
+
+#ifndef _HAVE_DAEMONIZE_H
+#define _HAVE_DAEMONIZE_H
+
+/* fork process into background and inherit new session
+ * if nochdir is 0, performs a chdir("/")
+ * if noclose is 0, closes all fds and dups stdout/err of daemon onto /dev/null
+ *
+ * returns -1 on error.
+ */
+int daemon(int nochdir, int noclose);
+
+#endif /* !_HAVE_DAEMONIZE_H */
--
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