merge process.[ch] with application.[ch]
diff --git a/src/application.c b/src/application.c
index 96b4204..5f8f447 100644
--- a/src/application.c
+++ b/src/application.c
@@ -1,5 +1,6 @@
/* Utility functions to setup applications */
/*
+ * (C) 2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2011 by Holger Hans Peter Freyther
*
* All Rights Reserved
@@ -24,6 +25,11 @@
#include <osmocom/core/logging.h>
#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
struct log_target *osmo_stderr_target;
@@ -47,3 +53,50 @@
log_set_all_filter(osmo_stderr_target, 1);
return 0;
}
+
+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 */
+/* since C89/C99 says stderr is a macro, we can safely do this! */
+#ifdef stderr
+ freopen("/dev/null", "r", stdin);
+ freopen("/dev/null", "w", stdout);
+ freopen("/dev/null", "w", stderr);
+#endif
+
+ return 0;
+}