main/busybox: added flock applet

1 files changed, 183 insertions, 0 deletions

diff --git a/main/busybox/flock-bb.patch b/main/busybox/flock-bb.patch
new file mode 100644
index 000000000..d97fbfcca
--- /dev/null
+++ b/main/busybox/flock-bb.patch
@@ -0,0 +1,183 @@
+From: Timo Teras <timo.teras@iki.fi>
+To: busybox@busybox.net
+Subject: [PATCH] flock: new applet
+Date: Tue, 16 Mar 2010 14:14:22 +0200
+Message-Id: <1268741663-8790-1-git-send-email-timo.teras@iki.fi>
+X-Mailer: git-send-email 1.6.3.3
+
+An utility to manage file locks from scripts.
+
+Signed-off-by: Timo Teras <timo.teras@iki.fi>
+---
+ include/applets.h    |    1 +
+ include/usage.h      |   11 ++++++
+ util-linux/Config.in |    6 +++
+ util-linux/Kbuild    |    1 +
+ util-linux/flock.c   |   93 ++++++++++++++++++++++++++++++++++++++++++++++++++
+ 5 files changed, 112 insertions(+), 0 deletions(-)
+ create mode 100644 util-linux/flock.c
+
+diff --git a/include/applets.h b/include/applets.h
+index 2d784bd..83c1792 100644
+--- a/include/applets.h
++++ b/include/applets.h
+@@ -161,6 +161,7 @@ IF_FLASH_ERASEALL(APPLET(flash_eraseall, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
+ IF_FLASH_LOCK(APPLET_ODDNAME(flash_lock, flash_lock_unlock, _BB_DIR_USR_SBIN, _BB_SUID_DROP, flash_lock))
+ IF_FLASH_UNLOCK(APPLET_ODDNAME(flash_unlock, flash_lock_unlock, _BB_DIR_USR_SBIN, _BB_SUID_DROP, flash_unlock))
+ IF_FLASHCP(APPLET(flashcp, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
++IF_FLOCK(APPLET(flock, _BB_DIR_USR_BIN, _BB_SUID_DROP))
+ IF_FOLD(APPLET(fold, _BB_DIR_USR_BIN, _BB_SUID_DROP))
+ IF_FREE(APPLET(free, _BB_DIR_USR_BIN, _BB_SUID_DROP))
+ IF_FREERAMDISK(APPLET(freeramdisk, _BB_DIR_SBIN, _BB_SUID_DROP))
+diff --git a/include/usage.h b/include/usage.h
+index f4259a1..cbf6bef 100644
+--- a/include/usage.h
++++ b/include/usage.h
+@@ -1312,6 +1312,17 @@
+      "\nOptions:" \
+      "\n	-v	Verbose" \
+ 
++#define flock_trivial_usage \
++       "[-sxun] [fd# | FILE] [-c] command"
++#define flock_full_usage "\n\n" \
++       "Manage file locks from scripts\n" \
++     "\nOptions:" \
++     "\n	-s	Get a shared lock" \
++     "\n	-x	Get an exclusive lock" \
++     "\n	-u	Remove a lock (from fd#)" \
++     "\n	-n	Fail rather than wait" \
++     "\n	-c	Command to run" \
++
+ #define fold_trivial_usage \
+        "[-bs] [-w WIDTH] [FILE]..."
+ #define fold_full_usage "\n\n" \
+diff --git a/util-linux/Config.in b/util-linux/Config.in
+index f04511b..d0d8df3 100644
+--- a/util-linux/Config.in
++++ b/util-linux/Config.in
+@@ -191,6 +191,12 @@ config FINDFS
+ 	  WARNING:
+ 	  With all submodules selected, it will add ~8k to busybox.
+ 
++config FLOCK
++	bool "flock"
++	default y
++	help
++	  Manage locks from shell scripts
++
+ config FREERAMDISK
+ 	bool "freeramdisk"
+ 	default n
+diff --git a/util-linux/Kbuild b/util-linux/Kbuild
+index 72a2ef1..99e3efe 100644
+--- a/util-linux/Kbuild
++++ b/util-linux/Kbuild
+@@ -13,6 +13,7 @@ lib-$(CONFIG_FDFLUSH)           += freeramdisk.o
+ lib-$(CONFIG_FDFORMAT)          += fdformat.o
+ lib-$(CONFIG_FDISK)             += fdisk.o
+ lib-$(CONFIG_FINDFS)            += findfs.o
++lib-$(CONFIG_FLOCK)             += flock.o
+ lib-$(CONFIG_FREERAMDISK)       += freeramdisk.o
+ lib-$(CONFIG_FSCK_MINIX)        += fsck_minix.o
+ lib-$(CONFIG_GETOPT)            += getopt.o
+diff --git a/util-linux/flock.c b/util-linux/flock.c
+new file mode 100644
+index 0000000..e9a22d5
+--- /dev/null
++++ b/util-linux/flock.c
+@@ -0,0 +1,93 @@
++/*
++ * Copyright (C) 2010 Timo Teras <timo.teras@iki.fi>
++ *
++ * 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"
++
++int flock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
++int flock_main(int argc, char **argv)
++{
++	char *command = NULL;
++	int mode, opt, fd, status = 0;
++	enum {
++		OPT_s = (1 << 0),
++		OPT_x = (1 << 1),
++		OPT_u = (1 << 2),
++		OPT_n = (1 << 3),
++		OPT_c = (1 << 4),
++	};
++
++#if ENABLE_LONG_OPTS
++        static const char getopt_longopts[] ALIGN1 =
++		"shared\0"	No_argument       "s"
++		"exclusive\0"	No_argument       "x"
++		"unblock\0"	No_argument       "u"
++		"nonblock\0"	No_argument	  "n"
++		"command\0"	Required_argument "c"
++		;
++	applet_long_options = getopt_longopts;
++#endif
++
++	opt = getopt32(argv, "sxunc:", &command);
++	argv += optind;
++	argc -= optind;
++
++	if (argv[0] == NULL)
++	        bb_show_usage();
++
++	if (command != NULL || argc > 1) {
++		fd = open(argv[0], O_RDONLY|O_NOCTTY|O_CREAT, 0666);
++		if (fd < 0 && errno == EISDIR)
++		        fd = open(argv[0], O_RDONLY|O_NOCTTY);
++	} else {
++		fd = atoi(argv[0]);
++	}
++	if (fd < 0)
++	        bb_perror_msg_and_die("cannot open: '%s'", argv[0]);
++
++	argv++;
++	if (command == NULL)
++	        command = argv[0];
++
++	if (opt & OPT_u)
++		mode = LOCK_UN;
++	else if (opt & OPT_s)
++		mode = LOCK_SH;
++	else
++		mode = LOCK_EX;
++
++	if (opt & OPT_n)
++		mode |= LOCK_NB;
++
++	if (flock(fd, mode) && errno == EWOULDBLOCK)
++		return 1;
++
++	if (command != NULL) {
++	        pid_t pid;
++
++	        pid = fork();
++	        if (pid < 0)
++                        bb_perror_msg_and_die("fork failed");
++                if (pid == 0) {
++                        execvp(command, argv);
++                        exit(1);
++                }
++                waitpid(pid, &status, 0);
++                if (WIFEXITED(status))
++                        status = WEXITSTATUS(status);
++                else if (WIFSIGNALED(status))
++                        status = WTERMSIG(status) + 128;
++                else
++                        status = 1;
++        }
++
++	return status;
++}
+-- 
+1.6.3.3