commit 874cd63: [Feature] Use own daemonization routine

[Vsevolod Stakhov]

Author: Vsevolod Stakhov
Date: 2020-11-06 21:23:45 +0000
URL: https://github.com/rspamd/rspamd/commit/874cd63ad2b66e3eb70db5c4fa35236f9d75e96e (HEAD -> master)

[Feature] Use own daemonization routine

---
 src/rspamd.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 61 insertions(+), 3 deletions(-)

diff --git a/src/rspamd.c b/src/rspamd.c
index 5e87103eb..5a1898c29 100644
--- a/src/rspamd.c
+++ b/src/rspamd.c
@@ -1260,6 +1260,65 @@ version (void)
 #endif
 }
 
+static gboolean
+rspamd_main_daemon (struct rspamd_main *rspamd_main)
+{
+	int fd;
+	pid_t old_pid = getpid ();
+
+	switch (fork ()) {
+	case -1:
+		msg_err_main ("fork() failed: %s", strerror (errno));
+		return FALSE;
+
+	case 0:
+		break;
+
+	default:
+		/* Old process */
+		exit (0);
+	}
+
+	rspamd_log_on_fork (g_quark_from_static_string ("main"),
+			rspamd_main->cfg,
+			rspamd_main->logger);
+
+	if (setsid () == -1) {
+		msg_err_main ("setsid () failed: %s", strerror (errno));
+		return FALSE;
+	}
+
+	umask (0);
+
+	fd = open ("/dev/null", O_RDWR);
+	if (fd == -1) {
+		msg_err_main ("open(\"/dev/null\") failed: %s", strerror (errno));
+		return FALSE;
+	}
+
+	if (dup2 (fd, STDIN_FILENO) == -1) {
+		msg_err_main ("dup2(STDIN) failed: %s", strerror (errno));
+		return FALSE;
+	}
+
+	if (dup2 (fd, STDOUT_FILENO) == -1) {
+		msg_err_main ("dup2(STDOUT) failed: %s", strerror (errno));
+		return FALSE;
+	}
+
+	if (fd > STDERR_FILENO) {
+		if (close(fd) == -1) {
+			msg_err_main ("close() failed: %s", strerror (errno));
+			return FALSE;
+		}
+	}
+
+	msg_info_main ("daemonized successfully; old pid %P, new pid %P",
+			old_pid, getpid ());
+
+	return TRUE;
+}
+
 gint
 main (gint argc, gchar **argv, gchar **env)
 {
@@ -1395,9 +1454,8 @@ main (gint argc, gchar **argv, gchar **env)
 
 	/* Daemonize */
 	if (!no_fork) {
-		if (daemon (0, 0) == -1) {
-			msg_err_main ("cannot daemonize: %s", strerror (errno));
-			exit (-errno);
+		if (!rspamd_main_daemon (rspamd_main)) {
+			exit (EXIT_FAILURE);
 		}
 
 		/* Close emergency logger */