mirror of
https://github.com/sheumann/hush.git
synced 2024-12-21 08:29:45 +00:00
892d4b6b3d
function old new delta flock_main - 253 +253 packed_usage 26466 26498 +32 applet_names 2170 2176 +6 applet_main 1280 1284 +4 applet_nameofs 640 642 +2 applet_install_loc 160 161 +1 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 5/0 up/down: 298/0) Total: 298 bytes Signed-off-by: Timo Teras <timo.teras@iki.fi> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2010 Timo Teras <timo.teras@iki.fi>
|
|
*
|
|
* This is free software, licensed under the GNU General Public License v2.
|
|
*/
|
|
#include <sys/file.h>
|
|
#include "libbb.h"
|
|
|
|
int flock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int flock_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
int mode, opt, fd;
|
|
enum {
|
|
OPT_s = (1 << 0),
|
|
OPT_x = (1 << 1),
|
|
OPT_n = (1 << 2),
|
|
OPT_u = (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"
|
|
"unlock\0" No_argument "u"
|
|
"nonblock\0" No_argument "n"
|
|
;
|
|
applet_long_options = getopt_longopts;
|
|
#endif
|
|
opt_complementary = "-1";
|
|
|
|
opt = getopt32(argv, "+sxnu");
|
|
argv += optind;
|
|
|
|
if (argv[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);
|
|
if (fd < 0)
|
|
bb_perror_msg_and_die("can't open '%s'", argv[0]);
|
|
//TODO? close_on_exec_on(fd);
|
|
} else {
|
|
fd = xatoi_u(argv[0]);
|
|
}
|
|
argv++;
|
|
|
|
/* If it is "flock FILE -c PROG", then -c isn't caught by getopt32:
|
|
* we use "+" in order to support "flock -opt FILE PROG -with-opts",
|
|
* we need to remove -c by hand.
|
|
* TODO: in upstream, -c 'PROG ARGS' means "run sh -c 'PROG ARGS'"
|
|
*/
|
|
if (argv[0]
|
|
&& argv[0][0] == '-'
|
|
&& ( (argv[0][1] == 'c' && !argv[0][2])
|
|
|| (ENABLE_LONG_OPTS && strcmp(argv[0] + 1, "-command") == 0)
|
|
)
|
|
) {
|
|
argv++;
|
|
}
|
|
|
|
if (OPT_s == LOCK_SH && OPT_x == LOCK_EX && OPT_n == LOCK_NB && OPT_u == LOCK_UN) {
|
|
/* With suitably matched constants, mode setting is much simpler */
|
|
mode = opt & (LOCK_SH + LOCK_EX + LOCK_NB + LOCK_UN);
|
|
if (!(mode & ~LOCK_NB))
|
|
mode |= LOCK_EX;
|
|
} else {
|
|
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) != 0) {
|
|
if (errno == EWOULDBLOCK)
|
|
return EXIT_FAILURE;
|
|
bb_perror_nomsg_and_die();
|
|
}
|
|
|
|
if (argv[0])
|
|
return spawn_and_wait(argv);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|