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authorHarald Welte <laforge@gnumonks.org>2010-08-25 19:24:26 +0200
committerHarald Welte <laforge@gnumonks.org>2010-08-25 19:24:26 +0200
commitb6cb023c7b4a76fb3d5ca32dd0ffb8e94ac5f8a0 (patch)
tree8ac35cda29f886c2cf46ec8107d3a352ac3b61e4
parent72d0c536e9581a54ff9b6c9d66ce9af29256aeb6 (diff)
Add helper function 'osmo_daemonize()' to convert process into daemon
-rw-r--r--src/Makefile.am2
-rw-r--r--src/process.c71
2 files changed, 72 insertions, 1 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index e197e179..765fbb89 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -13,7 +13,7 @@ libosmocore_la_SOURCES = timer.c select.c signal.c msgb.c rxlev_stat.c \
tlv_parser.c bitvec.c comp128.c gsm_utils.c statistics.c \
write_queue.c utils.c rsl.c gsm48.c gsm48_ie.c \
logging.c gsm0808.c rate_ctr.c gsmtap_util.c \
- gprs_cipher_core.c crc16.c panic.c
+ gprs_cipher_core.c crc16.c panic.c process.c
if ENABLE_PLUGIN
libosmocore_la_SOURCES += plugin.c
diff --git a/src/process.c b/src/process.c
new file mode 100644
index 00000000..ab4b37e3
--- /dev/null
+++ b/src/process.c
@@ -0,0 +1,71 @@
+/* Process handling support code */
+
+/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+int osmo_daemonize(void)
+{
+ int rc;
+ pid_t pid, sid;
+
+ /* Check if parent PID == init, in which case we are already a daemon */
+ if (getppid() == 1)
+ return -EEXIST;
+
+ /* Fork from the parent process */
+ pid = fork();
+ if (pid < 0) {
+ /* some error happened */
+ return pid;
+ }
+
+ if (pid > 0) {
+ /* if we have received a positive PID, then we are the parent
+ * and can exit */
+ exit(0);
+ }
+
+ /* FIXME: do we really want this? */
+ umask(0);
+
+ /* Create a new session and set process group ID */
+ sid = setsid();
+ if (sid < 0)
+ return sid;
+
+ /* Change to the /tmp directory, which prevents the CWD from being locked
+ * and unable to remove it */
+ rc = chdir("/tmp");
+ if (rc < 0)
+ return rc;
+
+ /* Redirect stdio to /dev/null */
+ freopen("/dev/null", "r", stdin);
+ freopen("/dev/null", "w", stdout);
+ freopen("/dev/null", "w", stderr);
+
+ return 0;
+}