daemonize module

[ccan] / ccan / daemonize / daemonize.c

diff --git a/ccan/daemonize/daemonize.c b/ccan/daemonize/daemonize.c
new file mode 100644 (file)
index 0000000..861b0fc
--- /dev/null
+++ b/ccan/daemonize/daemonize.c
@@ -0,0 +1,31 @@
+#include <ccan/daemonize/daemonize.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+/* This code is based on Stevens Advanced Programming in the UNIX
+ * Environment. */
+bool daemonize(void)
+{
+       pid_t pid;
+
+       /* Separate from our parent via fork, so init inherits us. */
+       if ((pid = fork()) < 0)
+               return false;
+       if (pid != 0)
+               exit(0);
+
+       /* Don't hold files open. */
+       close(STDIN_FILENO);
+       close(STDOUT_FILENO);
+       close(STDERR_FILENO);
+
+       /* Session leader so ^C doesn't whack us. */
+       setsid();
+       /* Move off any mount points we might be in. */
+       chdir("/");
+       /* Discard our parent's old-fashioned umask prejudices. */
+       umask(0);
+       return true;
+}