Initial commit.

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..5c86017
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,74 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <syslog.h>
+
+#include "utils.h"
+
+#define _POSIX_PATH_MAX 256
+
+
+void set_procname(char *arg0, const char *newname)
+{
+	memset(arg0, 0, _POSIX_PATH_MAX);
+	strncpy(arg0, newname, _POSIX_PATH_MAX);
+}
+
+int daemonize(void)
+{
+    pid_t pid;
+
+    /* Fork off the parent process */
+    pid = fork();
+
+    /* An error occurred */
+    if (pid < 0)
+        exit(EXIT_FAILURE);
+
+    /* Success: Let the parent terminate */
+    if (pid > 0)
+        exit(EXIT_SUCCESS);
+
+    /* On success: The child process becomes session leader */
+    if (setsid() < 0)
+        exit(EXIT_FAILURE);
+
+    /* Catch, ignore and handle signals */
+    //TODO: Implement a working signal handler */
+    signal(SIGCHLD, SIG_IGN);
+    signal(SIGHUP, SIG_IGN);
+
+    /* Fork off for the second time*/
+    pid = fork();
+
+    /* An error occurred */
+    if (pid < 0)
+        exit(EXIT_FAILURE);
+
+    /* Success: Let the parent terminate */
+    if (pid > 0)
+        exit(EXIT_SUCCESS);
+
+    /* Set new file permissions */
+    umask(0);
+
+    /* Change the working directory to the root directory */
+    /* or another appropriated directory */
+    chdir("/");
+
+    /* Close all open file descriptors */
+    int x;
+    for (x = sysconf(_SC_OPEN_MAX); x>=0; x--)
+    {
+        close (x);
+    }
+
+    /* Open the log file */
+    openlog ("firstdaemon", LOG_PID, LOG_DAEMON);
+
+    return 0;
+}