1 files changed, 60 insertions, 0 deletions
diff --git a/tacplus-daemon/daemon.c b/tacplus-daemon/daemon.c
new file mode 100644
index 0000000..0f1e2e4
--- /dev/null
+++ b/tacplus-daemon/daemon.c
@@ -0,0 +1,60 @@
+/*
+	TACACS+ D-Bus Daemon code
+
+	Copyright (c) 2019 AT&T Intellectual Property.
+	Copyright (c) 2015-2016 Brocade Communications Systems, Inc.
+
+	SPDX-License-Identifier: GPL-2.0-only
+*/
+
+#include "daemon.h"
+
+/* TODO
+ * -use strerror_r() instead of strerror()
+ */
+
+
+/* TODO: Take filename from command line */
+static void record_pid(const char *fname)
+{
+	FILE *f = fopen(fname, "w");
+
+	if (f == NULL) {
+		/* TODO: append strerr() */
+		syslog(LOG_ERR, "Failed to open pid file: %s", fname);
+		return;
+	}
+
+	fprintf(f, "%u\n", getpid());
+	fclose(f);
+}
+
+void daemonize(const char *tacplus_pid)
+{
+	/* 0 returned in child */
+	if (fork() != 0) {
+		exit(EXIT_SUCCESS); /* parent exit */
+	}
+
+	/* Become new process group leader */
+	if (setsid() < 0) {
+		fprintf(stderr, "setsid() failed. Error: %s", strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	/* Overwrite parent's cwd */
+	if(chdir("/") < 0) {
+		fprintf(stderr, "Changing cwd to root directory failed. Error: %s",
+						   strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	/* Close standard file descriptors */
+	close(STDIN_FILENO);
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+
+	/* Reset file permissions */
+	umask(0);
+	record_pid(tacplus_pid);
+}
+