@ -35,7 +35,7 @@
lib-$(CONFIG_MICROCOM) += microcom.o
lib-$(CONFIG_MICROCOM) += microcom.o
--- /dev/null
--- /dev/null
+++ b/miscutils/lock.c
+++ b/miscutils/lock.c
@@ -0,0 +1,135 @@
@@ -0,0 +1,144 @@
+/*
+/*
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ *
+ *
@ -56,6 +56,7 @@
+static int unlock = 0;
+static int unlock = 0;
+static int shared = 0;
+static int shared = 0;
+static int waitonly = 0;
+static int waitonly = 0;
+static int try_lock = 0;
+static int fd;
+static int fd;
+static char *file;
+static char *file;
+
+
@ -65,6 +66,7 @@
+ " -s Use shared locking\n"
+ " -s Use shared locking\n"
+ " -u Unlock\n"
+ " -u Unlock\n"
+ " -w Wait for the lock to become free, don't acquire lock\n"
+ " -w Wait for the lock to become free, don't acquire lock\n"
+ " -n Don't wait for the lock to become free. Fail with exit code\n"
+ "\n", name);
+ "\n", name);
+ exit(1);
+ exit(1);
+}
+}
@ -95,6 +97,7 @@
+static int do_lock(void)
+static int do_lock(void)
+{
+{
+ int pid;
+ int pid;
+ int flags;
+ char pidstr[8];
+ char pidstr[8];
+
+
+ if ((fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0700)) < 0) {
+ if ((fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0700)) < 0) {
@ -104,7 +107,10 @@
+ }
+ }
+ }
+ }
+
+
+ if (flock(fd, (shared ? LOCK_SH : LOCK_EX)) < 0) {
+ flags = shared ? LOCK_SH : LOCK_EX;
+ flags |= try_lock ? LOCK_NB : 0;
+
+ if (flock(fd, flags) < 0) {
+ fprintf(stderr, "Can't lock %s\n", file);
+ fprintf(stderr, "Can't lock %s\n", file);
+ return 1;
+ return 1;
+ }
+ }
@ -156,6 +162,9 @@
+ case 'u':
+ case 'u':
+ unlock = 1;
+ unlock = 1;
+ break;
+ break;
+ case 'n':
+ try_lock = 1;
+ break;
+ }
+ }
+ }
+ }
+ c--;
+ c--;