busybox: update to 1.22.1

[openwrt.git] / package / utils / busybox / patches / 220-add_lock_util.patch

diff --git a/package/utils/busybox/patches/220-add_lock_util.patch b/package/utils/busybox/patches/220-add_lock_util.patch
new file mode 100644 (file)
index 0000000..ce663b6
--- /dev/null
+++ b/package/utils/busybox/patches/220-add_lock_util.patch
@@ -0,0 +1,173 @@
+--- a/include/applets.src.h
++++ b/include/applets.src.h
+@@ -212,6 +212,7 @@ 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 +419,12 @@ config FEATURE_HDPARM_HDIO_GETSET_DMA
+       help
+         Enables the 'hdparm -d' option to get/set using_dma flag.
+ 
++config LOCK
++      bool "lock"
++      default n
++      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();
++}