Add daemonize function to lib for klogd and syslogd

2 files changed, 18 insertions, 0 deletions

diff --git a/lib/lib.h b/lib/lib.h
index f66a70c7..4e657a17 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -202,3 +202,5 @@ unsigned long get_int_value(const char *numstr, unsigned lowrange, unsigned high
 // grep helper functions
 char  *astrcat (char *, char *);
 char *xastrcat (char *, char *);
+
+void daemonize(void);
diff --git a/lib/pending.c b/lib/pending.c
index fad1c656..79b9c91c 100644
--- a/lib/pending.c
+++ b/lib/pending.c
@@ -102,3 +102,19 @@ char *xastrcat (char *x, char *y) {
   if (!x) error_exit ("xastrcat");
   return x;
 }
+
+void daemonize(void)
+{
+  int fd = open("/dev/null", O_RDWR);
+  if (fd < 0) fd = xcreate("/", O_RDONLY, 0666);
+
+  pid_t pid = fork();
+  if (pid < 0) perror_exit("DAEMON: failed to fork");
+  if (pid) exit(EXIT_SUCCESS);
+
+  setsid();
+  dup2(fd, 0);
+  dup2(fd, 1);
+  dup2(fd, 2);
+  if (fd > 2) close(fd);
+}