1 files changed, 150 insertions, 0 deletions
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
new file mode 100644
index 000000000..c01cd5765
--- /dev/null
+++ b/networking/udhcp/common.c
@@ -0,0 +1,150 @@
+/* common.c
+ *
+ * Functions to assist in the writing and removing of pidfiles.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> Soptember 2001
+ * Rewrited by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/socket.h>
+
+#include "common.h"
+
+
+static int daemonized;
+
+#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
+
+void udhcp_logging(int level, const char *fmt, ...)
+{
+	int e = errno;
+	va_list p;
+	va_list p2;
+
+	va_start(p, fmt);
+	__va_copy(p2, p);
+	if(!daemonized) {
+		vprintf(fmt, p);
+		putchar('\n');
+		errno = e;
+	}
+	vsyslog(level, fmt, p2);
+	va_end(p);
+}
+
+void start_log(const char *client_server)
+{
+	openlog(bb_applet_name, LOG_PID | LOG_CONS, LOG_LOCAL0);
+	udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
+}
+
+#else
+
+static char *syslog_level_msg[] = {
+	[LOG_EMERG]   = "EMERGENCY!",
+	[LOG_ALERT]   = "ALERT!",
+	[LOG_CRIT]    = "critical!",
+	[LOG_WARNING] = "warning",
+	[LOG_ERR]     = "error",
+	[LOG_INFO]    = "info",
+	[LOG_DEBUG]   = "debug"
+};
+
+void udhcp_logging(int level, const char *fmt, ...)
+{
+	int e = errno;
+	va_list p;
+
+	va_start(p, fmt);
+	if(!daemonized) {
+		printf("%s, ", syslog_level_msg[level]);
+		errno = e;
+		vprintf(fmt, p);
+		putchar('\n');
+	}
+	va_end(p);
+}
+
+void start_log(const char *client_server)
+{
+	udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
+}
+#endif
+
+static const char *saved_pidfile;
+
+static void exit_fun(void)
+{
+	if (saved_pidfile) unlink(saved_pidfile);
+}
+
+void background(const char *pidfile)
+{
+	int pid_fd = -1;
+
+	if (pidfile) {
+		pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
+		if (pid_fd < 0) {
+			LOG(LOG_ERR, "Unable to open pidfile %s: %m", pidfile);
+		} else {
+			lockf(pid_fd, F_LOCK, 0);
+			if(!saved_pidfile)
+				atexit(exit_fun);       /* set atexit one only */
+			saved_pidfile = pidfile;        /* but may be rewrite */
+		}
+	}
+	while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */
+	if (daemon(0, 0) == -1) {
+		perror("fork");
+		exit(1);
+	}
+	daemonized++;
+	if (pid_fd >= 0) {
+		FILE *out;
+
+		if ((out = fdopen(pid_fd, "w")) != NULL) {
+			fprintf(out, "%d\n", getpid());
+			fclose(out);
+		}
+		lockf(pid_fd, F_UNLCK, 0);
+		close(pid_fd);
+	}
+}
+
+/* Signal handler */
+int udhcp_signal_pipe[2];
+static void signal_handler(int sig)
+{
+	if (send(udhcp_signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
+		LOG(LOG_ERR, "Could not send signal: %m");
+	}
+}
+
+void udhcp_set_signal_pipe(int sig_add)
+{
+	socketpair(AF_UNIX, SOCK_STREAM, 0, udhcp_signal_pipe);
+	signal(SIGUSR1, signal_handler);
+	signal(SIGTERM, signal_handler);
+	if(sig_add)
+		signal(sig_add, signal_handler);
+}