[thirdparty/util-linux.git] / sys-utils / flock.c

/*   Copyright 2003-2005 H. Peter Anvin - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#include "c.h"
#include "nls.h"
#include "strutils.h"
#include "closestream.h"

static void __attribute__((__noreturn__)) usage(int ex)
{
	fprintf(stderr, USAGE_HEADER);
	fprintf(stderr,
		_(" %1$s [options] <file descriptor number>\n"
		  " %1$s [options] <file> -c <command>\n"
		  " %1$s [options} <directory> -c <command>\n"),
		program_invocation_short_name);
	fputs(USAGE_OPTIONS, stderr);
	fputs(_(  " -s  --shared             get a shared lock\n"), stderr);
	fputs(_(  " -x  --exclusive          get an exclusive lock (default)\n"), stderr);
	fputs(_(  " -u  --unlock             remove a lock\n"), stderr);
	fputs(_(  " -n  --nonblock           fail rather than wait\n"), stderr);
	fputs(_(  " -w  --timeout <secs>     wait for a limited amount of time\n"), stderr);
	fputs(_(  " -o  --close              close file descriptor before running command\n"), stderr);
	fputs(_(  " -c  --command <command>  run a single command string through the shell\n"), stderr);
	fprintf(stderr, USAGE_SEPARATOR);
	fprintf(stderr, USAGE_HELP);
	fprintf(stderr, USAGE_VERSION);
	fprintf(stderr, USAGE_MAN_TAIL("flock(1)"));
	exit(ex);
}

static sig_atomic_t timeout_expired = 0;

static void timeout_handler(int sig __attribute__((__unused__)))
{
	timeout_expired = 1;
}

static void strtotimeval(const char *str, struct timeval *tv)
{
	double user_input;

	user_input = strtod_or_err(str, "bad number");
	tv->tv_sec = (time_t) user_input;
	tv->tv_usec = (long)((user_input - tv->tv_sec) * 1000000);
	if ((tv->tv_sec + tv->tv_usec) == 0)
		errx(EX_USAGE, _("timeout cannot be zero"));
}

static void setup_timer(struct itimerval *timer, struct itimerval *old_timer,
			struct sigaction *sa, struct sigaction *old_sa)
{
	memset(sa, 0, sizeof *sa);
	sa->sa_handler = timeout_handler;
	sa->sa_flags = SA_RESETHAND;
	sigaction(SIGALRM, sa, old_sa);
	setitimer(ITIMER_REAL, timer, old_timer);
}

static void cancel_timer(struct itimerval *old_timer, struct sigaction *old_sa)
{
	setitimer(ITIMER_REAL, old_timer, NULL);
	sigaction(SIGALRM, old_sa, NULL);
}

static int open_file(const char *filename, int *flags)
{

	int fd;
	int fl = *flags == 0 ? O_RDONLY : *flags;

	errno = 0;
	fl |= O_NOCTTY | O_CREAT;
	fd = open(filename, fl, 0666);

	/* Linux doesn't like O_CREAT on a directory, even though it
	 * should be a no-op; POSIX doesn't allow O_RDWR or O_WRONLY
	 */
	if (fd < 0 && errno == EISDIR) {
		fl = O_RDONLY | O_NOCTTY;
		fd = open(filename, fl);
	}
	if (fd < 0) {
		warn(_("cannot open lock file %s"), filename);
		if (errno == ENOMEM || errno == EMFILE || errno == ENFILE)
			exit(EX_OSERR);
		if (errno == EROFS || errno == ENOSPC)
			exit(EX_CANTCREAT);
		exit(EX_NOINPUT);
	}
	*flags = fl;
	return fd;
}

int main(int argc, char *argv[])
{
	struct itimerval timeout, old_timer;
	int have_timeout = 0;
	int type = LOCK_EX;
	int block = 0;
	int open_flags = 0;
	int fd = -1;
	int opt, ix;
	int do_close = 0;
	int status;
	char **cmd_argv = NULL, *sh_c_argv[4];
	const char *filename = NULL;
	struct sigaction sa, old_sa;

	static const struct option long_options[] = {
		{"shared", no_argument, NULL, 's'},
		{"exclusive", no_argument, NULL, 'x'},
		{"unlock", no_argument, NULL, 'u'},
		{"nonblocking", no_argument, NULL, 'n'},
		{"nb", no_argument, NULL, 'n'},
		{"timeout", required_argument, NULL, 'w'},
		{"wait", required_argument, NULL, 'w'},
		{"close", no_argument, NULL, 'o'},
		{"help", no_argument, NULL, 'h'},
		{"version", no_argument, NULL, 'V'},
		{NULL, 0, NULL, 0}
	};

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	atexit(close_stdout);

	if (argc < 2)
		usage(EX_USAGE);

	memset(&timeout, 0, sizeof timeout);

	optopt = 0;
	while ((opt =
		getopt_long(argc, argv, "+sexnouw:hV?", long_options,
			    &ix)) != EOF) {
		switch (opt) {
		case 's':
			type = LOCK_SH;
			break;
		case 'e':
		case 'x':
			type = LOCK_EX;
			break;
		case 'u':
			type = LOCK_UN;
			break;
		case 'o':
			do_close = 1;
			break;
		case 'n':
			block = LOCK_NB;
			break;
		case 'w':
			have_timeout = 1;
			strtotimeval(optarg, &timeout.it_value);
			break;
		case 'V':
			printf("flock (%s)\n", PACKAGE_STRING);
			exit(EX_OK);
		default:
			/* optopt will be set if this was an unrecognized
			 * option, i.e.  *not* 'h' or '?
			 */
			usage(optopt ? EX_USAGE : 0);
			break;
		}
	}

	if (argc > optind + 1) {
		/* Run command */
		if (!strcmp(argv[optind + 1], "-c") ||
		    !strcmp(argv[optind + 1], "--command")) {
			if (argc != optind + 3)
				errx(EX_USAGE,
				     _("%s requires exactly one command argument"),
				     argv[optind + 1]);
			cmd_argv = sh_c_argv;
			cmd_argv[0] = getenv("SHELL");
			if (!cmd_argv[0] || !*cmd_argv[0])
				cmd_argv[0] = _PATH_BSHELL;
			cmd_argv[1] = "-c";
			cmd_argv[2] = argv[optind + 2];
			cmd_argv[3] = 0;
		} else {
			cmd_argv = &argv[optind + 1];
		}

		filename = argv[optind];
		fd = open_file(filename, &open_flags);

	} else if (optind < argc) {
		/* Use provided file descriptor */
		fd = (int)strtol_or_err(argv[optind], "bad number");
	} else {
		/* Bad options */
		errx(EX_USAGE, _("requires file descriptor, file or directory"));
	}

	if (have_timeout) {
		if (timeout.it_value.tv_sec == 0 &&
		    timeout.it_value.tv_usec == 0) {
			/* -w 0 is equivalent to -n; this has to be
			 * special-cased because setting an itimer to zero
			 * means disabled!
			 */
			have_timeout = 0;
			block = LOCK_NB;
		} else
			setup_timer(&timeout, &old_timer, &sa, &old_sa);
	}

	while (flock(fd, type | block)) {
		switch (errno) {
		case EWOULDBLOCK:
			/* -n option set and failed to lock. The numeric
			 * exit value is specified in man flock.1
			 */
			exit(1);
		case EINTR:
			/* Signal received */
			if (timeout_expired)
				/* -w option set and failed to lock. The
				 * numeric exit value is specified in man
				 * flock.1
				 */
				exit(1);
			/* otherwise try again */
			continue;
		case EIO:
			/* Probably NFSv4 where flock() is emulated by fcntl().
			 * Let's try to reopen in read-write mode.
			 */
			if (!(open_flags & O_RDWR) &&
			    type != LOCK_SH &&
			    access(filename, R_OK | W_OK) == 0) {

				close(fd);
				open_flags = O_RDWR;
				fd = open_file(filename, &open_flags);

				if (open_flags & O_RDWR)
					break;
			}
			/* go through */
		default:
			/* Other errors */
			if (filename)
				warn("%s", filename);
			else
				warn("%d", fd);
			exit((errno == ENOLCK
			      || errno == ENOMEM) ? EX_OSERR : EX_DATAERR);
		}
	}

	if (have_timeout)
		cancel_timer(&old_timer, &old_sa);

	status = EX_OK;

	if (cmd_argv) {
		pid_t w, f;
		/* Clear any inherited settings */
		signal(SIGCHLD, SIG_DFL);
		f = fork();

		if (f < 0) {
			err(EX_OSERR, _("fork failed"));
		} else if (f == 0) {
			if (do_close)
				close(fd);
			execvp(cmd_argv[0], cmd_argv);
			/* execvp() failed */
			warn("%s", cmd_argv[0]);
			_exit((errno == ENOMEM) ? EX_OSERR : EX_UNAVAILABLE);
		} else {
			do {
				w = waitpid(f, &status, 0);
				if (w == -1 && errno != EINTR)
					break;
			} while (w != f);

			if (w == -1) {
				status = EXIT_FAILURE;
				warn(_("waitpid failed"));
			} else if (WIFEXITED(status))
				status = WEXITSTATUS(status);
			else if (WIFSIGNALED(status))
				status = WTERMSIG(status) + 128;
			else
				/* WTF? */
				status = EX_OSERR;
		}
	}

	return status;
}
Commit	Line	Data
75332f0f	1	/* Copyright 2003-2005 H. Peter Anvin - All Rights Reserved
baf39af1 KZ	2	*
	3	* Permission is hereby granted, free of charge, to any person
	4	* obtaining a copy of this software and associated documentation
	5	* files (the "Software"), to deal in the Software without
	6	* restriction, including without limitation the rights to use,
	7	* copy, modify, merge, publish, distribute, sublicense, and/or
	8	* sell copies of the Software, and to permit persons to whom
	9	* the Software is furnished to do so, subject to the following
	10	* conditions:
db1749cf	11	*
baf39af1 KZ	12	* The above copyright notice and this permission notice shall
baf39af1 KZ	13	* be included in all copies or substantial portions of the Software.
db1749cf	14	*
baf39af1 KZ	15	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	16	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
	17	* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	18	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
	19	* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
	20	* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	21	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	22	* OTHER DEALINGS IN THE SOFTWARE.
75332f0f	23	*/
baf39af1	24
75332f0f	25	#include <ctype.h>
baf39af1	26	#include <errno.h>
75332f0f	27	#include <fcntl.h>
baf39af1	28	#include <getopt.h>
75332f0f	29	#include <paths.h>
baf39af1	30	#include <signal.h>
75332f0f SK	31	#include <stdio.h>
75332f0f SK	32	#include <stdlib.h>
baf39af1	33	#include <string.h>
baf39af1	34	#include <sysexits.h>
baf39af1	35	#include <sys/file.h>
75332f0f	36	#include <sys/stat.h>
baf39af1	37	#include <sys/time.h>
75332f0f	38	#include <sys/types.h>
d162fcb5	39	#include <sys/wait.h>
75332f0f	40	#include <unistd.h>
d162fcb5	41
d4eafec4	42	#include "c.h"
db1749cf	43	#include "nls.h"
37bb0ce8	44	#include "strutils.h"
efb8854f	45	#include "closestream.h"
db1749cf	46
e8cea669	47	static void __attribute__((__noreturn__)) usage(int ex)
baf39af1	48	{
dc36ee2a	49	fprintf(stderr, USAGE_HEADER);
75332f0f	50	fprintf(stderr,
dc36ee2a SK	51	_(" %1$s [options] <file descriptor number>\n"
	52	" %1$s [options] <file> -c <command>\n"
	53	" %1$s [options} <directory> -c <command>\n"),
d4eafec4	54	program_invocation_short_name);
dc36ee2a SK	55	fputs(USAGE_OPTIONS, stderr);
	56	fputs(_( " -s --shared get a shared lock\n"), stderr);
	57	fputs(_( " -x --exclusive get an exclusive lock (default)\n"), stderr);
	58	fputs(_( " -u --unlock remove a lock\n"), stderr);
	59	fputs(_( " -n --nonblock fail rather than wait\n"), stderr);
	60	fputs(_( " -w --timeout <secs> wait for a limited amount of time\n"), stderr);
	61	fputs(_( " -o --close close file descriptor before running command\n"), stderr);
	62	fputs(_( " -c --command <command> run a single command string through the shell\n"), stderr);
	63	fprintf(stderr, USAGE_SEPARATOR);
	64	fprintf(stderr, USAGE_HELP);
	65	fprintf(stderr, USAGE_VERSION);
	66	fprintf(stderr, USAGE_MAN_TAIL("flock(1)"));
75332f0f	67	exit(ex);
baf39af1 KZ	68	}
baf39af1 KZ	69
baf39af1 KZ	70	static sig_atomic_t timeout_expired = 0;
baf39af1 KZ	71
e8cea669	72	static void timeout_handler(int sig __attribute__((__unused__)))
baf39af1	73	{
75332f0f	74	timeout_expired = 1;
baf39af1 KZ	75	}
baf39af1 KZ	76
605325b2	77	static void strtotimeval(const char str, struct timeval tv)
baf39af1	78	{
605325b2	79	double user_input;
75332f0f	80
605325b2 SK	81	user_input = strtod_or_err(str, "bad number");
	82	tv->tv_sec = (time_t) user_input;
	83	tv->tv_usec = (long)((user_input - tv->tv_sec) * 1000000);
	84	if ((tv->tv_sec + tv->tv_usec) == 0)
	85	errx(EX_USAGE, _("timeout cannot be zero"));
baf39af1 KZ	86	}
baf39af1 KZ	87
bc3ae4c6 KZ	88	static void setup_timer(struct itimerval timer, struct itimerval old_timer,
	89	struct sigaction sa, struct sigaction old_sa)
	90	{
1bbf8203	91	memset(sa, 0, sizeof *sa);
bc3ae4c6 KZ	92	sa->sa_handler = timeout_handler;
	93	sa->sa_flags = SA_RESETHAND;
	94	sigaction(SIGALRM, sa, old_sa);
	95	setitimer(ITIMER_REAL, timer, old_timer);
	96	}
	97
	98	static void cancel_timer(struct itimerval old_timer, struct sigaction old_sa)
	99	{
	100	setitimer(ITIMER_REAL, old_timer, NULL);
	101	sigaction(SIGALRM, old_sa, NULL);
	102	}
	103
eb742a1f KZ	104	static int open_file(const char filename, int flags)
	105	{
	106
	107	int fd;
	108	int fl = flags == 0 ? O_RDONLY : flags;
	109
	110	errno = 0;
	111	fl \|= O_NOCTTY \| O_CREAT;
	112	fd = open(filename, fl, 0666);
	113
	114	/* Linux doesn't like O_CREAT on a directory, even though it
	115	* should be a no-op; POSIX doesn't allow O_RDWR or O_WRONLY
	116	*/
	117	if (fd < 0 && errno == EISDIR) {
	118	fl = O_RDONLY \| O_NOCTTY;
	119	fd = open(filename, fl);
	120	}
	121	if (fd < 0) {
	122	warn(_("cannot open lock file %s"), filename);
	123	if (errno == ENOMEM \|\| errno == EMFILE \|\| errno == ENFILE)
	124	exit(EX_OSERR);
	125	if (errno == EROFS \|\| errno == ENOSPC)
	126	exit(EX_CANTCREAT);
	127	exit(EX_NOINPUT);
	128	}
	129	*flags = fl;
	130	return fd;
	131	}
	132
baf39af1	133	int main(int argc, char *argv[])
d162fcb5	134	{
75332f0f SK	135	struct itimerval timeout, old_timer;
	136	int have_timeout = 0;
	137	int type = LOCK_EX;
	138	int block = 0;
eb742a1f	139	int open_flags = 0;
75332f0f SK	140	int fd = -1;
	141	int opt, ix;
	142	int do_close = 0;
75332f0f	143	int status;
75332f0f SK	144	char *cmd_argv = NULL, sh_c_argv[4];
	145	const char *filename = NULL;
	146	struct sigaction sa, old_sa;
	147
d89bfedf SK	148	static const struct option long_options[] = {
	149	{"shared", no_argument, NULL, 's'},
	150	{"exclusive", no_argument, NULL, 'x'},
	151	{"unlock", no_argument, NULL, 'u'},
	152	{"nonblocking", no_argument, NULL, 'n'},
	153	{"nb", no_argument, NULL, 'n'},
	154	{"timeout", required_argument, NULL, 'w'},
	155	{"wait", required_argument, NULL, 'w'},
	156	{"close", no_argument, NULL, 'o'},
	157	{"help", no_argument, NULL, 'h'},
	158	{"version", no_argument, NULL, 'V'},
	159	{NULL, 0, NULL, 0}
	160	};
	161
75332f0f SK	162	setlocale(LC_ALL, "");
	163	bindtextdomain(PACKAGE, LOCALEDIR);
	164	textdomain(PACKAGE);
efb8854f	165	atexit(close_stdout);
75332f0f	166
75332f0f SK	167	if (argc < 2)
	168	usage(EX_USAGE);
	169
	170	memset(&timeout, 0, sizeof timeout);
	171
	172	optopt = 0;
	173	while ((opt =
	174	getopt_long(argc, argv, "+sexnouw:hV?", long_options,
	175	&ix)) != EOF) {
	176	switch (opt) {
	177	case 's':
	178	type = LOCK_SH;
	179	break;
	180	case 'e':
	181	case 'x':
	182	type = LOCK_EX;
	183	break;
	184	case 'u':
	185	type = LOCK_UN;
	186	break;
	187	case 'o':
	188	do_close = 1;
	189	break;
	190	case 'n':
	191	block = LOCK_NB;
	192	break;
	193	case 'w':
	194	have_timeout = 1;
605325b2	195	strtotimeval(optarg, &timeout.it_value);
75332f0f SK	196	break;
	197	case 'V':
	198	printf("flock (%s)\n", PACKAGE_STRING);
56d45cfa	199	exit(EX_OK);
75332f0f SK	200	default:
	201	/* optopt will be set if this was an unrecognized
	202	* option, i.e. not 'h' or '?
	203	*/
	204	usage(optopt ? EX_USAGE : 0);
	205	break;
	206	}
	207	}
	208
	209	if (argc > optind + 1) {
	210	/* Run command */
	211	if (!strcmp(argv[optind + 1], "-c") \|\|
	212	!strcmp(argv[optind + 1], "--command")) {
d4eafec4 SK	213	if (argc != optind + 3)
	214	errx(EX_USAGE,
	215	_("%s requires exactly one command argument"),
	216	argv[optind + 1]);
75332f0f SK	217	cmd_argv = sh_c_argv;
	218	cmd_argv[0] = getenv("SHELL");
	219	if (!cmd_argv[0] \|\| !*cmd_argv[0])
	220	cmd_argv[0] = _PATH_BSHELL;
	221	cmd_argv[1] = "-c";
	222	cmd_argv[2] = argv[optind + 2];
	223	cmd_argv[3] = 0;
	224	} else {
	225	cmd_argv = &argv[optind + 1];
	226	}
	227
	228	filename = argv[optind];
eb742a1f KZ	229	fd = open_file(filename, &open_flags);
eb742a1f KZ	230
75332f0f SK	231	} else if (optind < argc) {
75332f0f SK	232	/* Use provided file descriptor */
37bb0ce8	233	fd = (int)strtol_or_err(argv[optind], "bad number");
75332f0f SK	234	} else {
75332f0f SK	235	/* Bad options */
d4eafec4	236	errx(EX_USAGE, _("requires file descriptor, file or directory"));
75332f0f SK	237	}
	238
	239	if (have_timeout) {
	240	if (timeout.it_value.tv_sec == 0 &&
	241	timeout.it_value.tv_usec == 0) {
	242	/* -w 0 is equivalent to -n; this has to be
	243	* special-cased because setting an itimer to zero
	244	* means disabled!
	245	*/
	246	have_timeout = 0;
	247	block = LOCK_NB;
bc3ae4c6 KZ	248	} else
bc3ae4c6 KZ	249	setup_timer(&timeout, &old_timer, &sa, &old_sa);
75332f0f SK	250	}
	251
	252	while (flock(fd, type \| block)) {
d4eafec4	253	switch (errno) {
75332f0f	254	case EWOULDBLOCK:
56d45cfa SK	255	/* -n option set and failed to lock. The numeric
	256	* exit value is specified in man flock.1
	257	*/
75332f0f SK	258	exit(1);
	259	case EINTR:
	260	/* Signal received */
	261	if (timeout_expired)
56d45cfa SK	262	/* -w option set and failed to lock. The
	263	* numeric exit value is specified in man
	264	* flock.1
	265	*/
75332f0f SK	266	exit(1);
	267	/* otherwise try again */
	268	continue;
eb742a1f KZ	269	case EIO:
	270	/* Probably NFSv4 where flock() is emulated by fcntl().
	271	* Let's try to reopen in read-write mode.
	272	*/
	273	if (!(open_flags & O_RDWR) &&
	274	type != LOCK_SH &&
	275	access(filename, R_OK \| W_OK) == 0) {
	276
	277	close(fd);
	278	open_flags = O_RDWR;
	279	fd = open_file(filename, &open_flags);
	280
	281	if (open_flags & O_RDWR)
	282	break;
	283	}
	284	/* go through */
75332f0f SK	285	default:
	286	/* Other errors */
	287	if (filename)
d4eafec4	288	warn("%s", filename);
75332f0f	289	else
d4eafec4 SK	290	warn("%d", fd);
	291	exit((errno == ENOLCK
	292	\|\| errno == ENOMEM) ? EX_OSERR : EX_DATAERR);
75332f0f SK	293	}
	294	}
	295
bc3ae4c6 KZ	296	if (have_timeout)
bc3ae4c6 KZ	297	cancel_timer(&old_timer, &old_sa);
75332f0f	298
56d45cfa	299	status = EX_OK;
75332f0f SK	300
	301	if (cmd_argv) {
	302	pid_t w, f;
	303	/* Clear any inherited settings */
	304	signal(SIGCHLD, SIG_DFL);
	305	f = fork();
	306
	307	if (f < 0) {
d4eafec4	308	err(EX_OSERR, _("fork failed"));
75332f0f SK	309	} else if (f == 0) {
	310	if (do_close)
	311	close(fd);
	312	execvp(cmd_argv[0], cmd_argv);
75332f0f	313	/* execvp() failed */
d4eafec4 SK	314	warn("%s", cmd_argv[0]);
d4eafec4 SK	315	_exit((errno == ENOMEM) ? EX_OSERR : EX_UNAVAILABLE);
75332f0f SK	316	} else {
	317	do {
	318	w = waitpid(f, &status, 0);
	319	if (w == -1 && errno != EINTR)
	320	break;
	321	} while (w != f);
	322
	323	if (w == -1) {
75332f0f	324	status = EXIT_FAILURE;
d4eafec4	325	warn(_("waitpid failed"));
75332f0f SK	326	} else if (WIFEXITED(status))
	327	status = WEXITSTATUS(status);
	328	else if (WIFSIGNALED(status))
	329	status = WTERMSIG(status) + 128;
	330	else
	331	/* WTF? */
	332	status = EX_OSERR;
	333	}
	334	}
	335
	336	return status;
d162fcb5	337	}