1 files changed, 38 insertions, 22 deletions

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 3704ba7..7b2e19c 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -22,40 +22,56 @@ long uptime(void)
 	return info.uptime;
 }
 
-void udhcp_background(const char *pidfile)
+
+static const char *saved_pidfile;
+
+static void pidfile_delete(void)
+{
+	if (saved_pidfile)
+		unlink(saved_pidfile);
+}
+
+static int pidfile_acquire(const char *pidfile)
 {
-#ifdef __uClinux__
-	bb_error_msg("cannot background in uclinux (yet)");
-#else /* __uClinux__ */
 	int pid_fd;
+	if (!pidfile) return -1;
 
-	/* hold lock during fork. */
-	pid_fd = pidfile_acquire(pidfile);
-	setsid();
-	xdaemon(0, 0);
-	logmode &= ~LOGMODE_STDIO;
-	pidfile_write_release(pid_fd);
-#endif /* __uClinux__ */
+	pid_fd = open(pidfile, O_CREAT|O_WRONLY|O_TRUNC, 0644);
+	if (pid_fd < 0) {
+		bb_perror_msg("cannot open pidfile %s", pidfile);
+	} else {
+		/* lockf(pid_fd, F_LOCK, 0); */
+		if (!saved_pidfile)
+			atexit(pidfile_delete);
+		saved_pidfile = pidfile;
+	}
+
+	return pid_fd;
+}
+
+static void pidfile_write_release(int pid_fd)
+{
+	if (pid_fd < 0) return;
+
+	fdprintf(pid_fd, "%d\n", getpid());
+	/* lockf(pid_fd, F_UNLCK, 0); */
+	close(pid_fd);
 }
 
-void udhcp_start_log_and_pid(const char *pidfile)
+
+void udhcp_make_pidfile(const char *pidfile)
 {
 	int pid_fd;
 
-	/* Make sure our syslog fd isn't overwritten */
+	/* Make sure fd 0,1,2 are open */
 	bb_sanitize_stdio();
 
-	/* do some other misc startup stuff while we are here to save bytes */
-	pid_fd = pidfile_acquire(pidfile);
-	pidfile_write_release(pid_fd);
-
-	/* equivelent of doing a fflush after every \n */
+	/* Equivalent of doing a fflush after every \n */
 	setlinebuf(stdout);
 
-	if (ENABLE_FEATURE_UDHCP_SYSLOG) {
-		openlog(applet_name, LOG_PID, LOG_LOCAL0);
-		logmode |= LOGMODE_SYSLOG;
-	}
+	/* Create pidfile */
+	pid_fd = pidfile_acquire(pidfile);
+	pidfile_write_release(pid_fd);
 
 	bb_info_msg("%s (v%s) started", applet_name, BB_VER);
 }