summaryrefslogtreecommitdiff
path: root/package/utils/busybox/patches/340-lock_util.patch
diff options
context:
space:
mode:
Diffstat (limited to 'package/utils/busybox/patches/340-lock_util.patch')
-rw-r--r--package/utils/busybox/patches/340-lock_util.patch172
1 files changed, 172 insertions, 0 deletions
diff --git a/package/utils/busybox/patches/340-lock_util.patch b/package/utils/busybox/patches/340-lock_util.patch
new file mode 100644
index 0000000000..eb346421a4
--- /dev/null
+++ b/package/utils/busybox/patches/340-lock_util.patch
@@ -0,0 +1,172 @@
+--- a/include/applets.src.h
++++ b/include/applets.src.h
+@@ -218,6 +218,7 @@ IF_LN(APPLET_NOEXEC(ln, ln, BB_DIR_BIN,
+ IF_LOAD_POLICY(APPLET(load_policy, BB_DIR_USR_SBIN, BB_SUID_DROP))
+ IF_LOADFONT(APPLET(loadfont, BB_DIR_USR_SBIN, BB_SUID_DROP))
+ IF_LOADKMAP(APPLET(loadkmap, BB_DIR_SBIN, BB_SUID_DROP))
++IF_LOCK(APPLET(lock, BB_DIR_BIN, BB_SUID_DROP))
+ IF_LOGGER(APPLET(logger, BB_DIR_USR_BIN, BB_SUID_DROP))
+ /* Needs to be run by root or be suid root - needs to change uid and gid: */
+ IF_LOGIN(APPLET(login, BB_DIR_BIN, BB_SUID_REQUIRE))
+--- a/miscutils/Config.src
++++ b/miscutils/Config.src
+@@ -419,6 +419,11 @@ config FEATURE_HDPARM_HDIO_GETSET_DMA
+ help
+ Enables the 'hdparm -d' option to get/set using_dma flag.
+
++config LOCK
++ bool "lock"
++ help
++ Small utility for using locks in scripts
++
+ config MAKEDEVS
+ bool "makedevs"
+ default y
+--- a/miscutils/Kbuild.src
++++ b/miscutils/Kbuild.src
+@@ -29,6 +29,7 @@ lib-$(CONFIG_INOTIFYD) += inotifyd.o
+ lib-$(CONFIG_FEATURE_LAST_SMALL)+= last.o
+ lib-$(CONFIG_FEATURE_LAST_FANCY)+= last_fancy.o
+ lib-$(CONFIG_LESS) += less.o
++lib-$(CONFIG_LOCK) += lock.o
+ lib-$(CONFIG_MAKEDEVS) += makedevs.o
+ lib-$(CONFIG_MAN) += man.o
+ lib-$(CONFIG_MICROCOM) += microcom.o
+--- /dev/null
++++ b/miscutils/lock.c
+@@ -0,0 +1,135 @@
++/*
++ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
++ *
++ * This is free software, licensed under the GNU General Public License v2.
++ */
++#include <sys/types.h>
++#include <sys/file.h>
++#include <sys/stat.h>
++#include <signal.h>
++#include <fcntl.h>
++#include <unistd.h>
++#include <stdio.h>
++#include "busybox.h"
++
++//usage:#define lock_trivial_usage NOUSAGE_STR
++//usage:#define lock_full_usage ""
++
++static int unlock = 0;
++static int shared = 0;
++static int waitonly = 0;
++static int fd;
++static char *file;
++
++static void usage(char *name)
++{
++ fprintf(stderr, "Usage: %s [-suw] <filename>\n"
++ " -s Use shared locking\n"
++ " -u Unlock\n"
++ " -w Wait for the lock to become free, don't acquire lock\n"
++ "\n", name);
++ exit(1);
++}
++
++static void exit_unlock(int sig)
++{
++ flock(fd, LOCK_UN);
++ exit(0);
++}
++
++static int do_unlock(void)
++{
++ FILE *f;
++ int i;
++
++ if ((f = fopen(file, "r")) == NULL)
++ return 0;
++
++ fscanf(f, "%d", &i);
++ if (i > 0)
++ kill(i, SIGTERM);
++
++ fclose(f);
++
++ return 0;
++}
++
++static int do_lock(void)
++{
++ int pid;
++ char pidstr[8];
++
++ if ((fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0700)) < 0) {
++ if ((fd = open(file, O_RDWR)) < 0) {
++ fprintf(stderr, "Can't open %s\n", file);
++ return 1;
++ }
++ }
++
++ if (flock(fd, (shared ? LOCK_SH : LOCK_EX)) < 0) {
++ fprintf(stderr, "Can't lock %s\n", file);
++ return 1;
++ }
++
++ pid = fork();
++
++ if (pid < 0)
++ return -1;
++
++ if (pid == 0) {
++ signal(SIGKILL, exit_unlock);
++ signal(SIGTERM, exit_unlock);
++ signal(SIGINT, exit_unlock);
++ if (waitonly)
++ exit_unlock(0);
++ else
++ while (1)
++ sleep(1);
++ } else {
++ if (!waitonly) {
++ lseek(fd, 0, SEEK_SET);
++ ftruncate(fd, 0);
++ sprintf(pidstr, "%d\n", pid);
++ write(fd, pidstr, strlen(pidstr));
++ close(fd);
++ }
++
++ return 0;
++ }
++ return 0;
++}
++
++int lock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
++int lock_main(int argc, char **argv)
++{
++ char **args = &argv[1];
++ int c = argc - 1;
++
++ while ((*args != NULL) && (*args)[0] == '-') {
++ char *ch = *args;
++ while (*(++ch) > 0) {
++ switch(*ch) {
++ case 'w':
++ waitonly = 1;
++ break;
++ case 's':
++ shared = 1;
++ break;
++ case 'u':
++ unlock = 1;
++ break;
++ }
++ }
++ c--;
++ args++;
++ }
++
++ if (c != 1)
++ usage(argv[0]);
++
++ file = *args;
++ if (unlock)
++ return do_unlock();
++ else
++ return do_lock();
++}