1/*
2 * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11 *
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, write the Free Software Foundation, Inc.,
14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
15 *
16 */
17/**********************************************************
18 *
19 *    TEST IDENTIFIER   : flock04
20 *
21 *    EXECUTED BY       : anyone
22 *
23 *    TEST TITLE        : Testing different locks on flock(2)
24 *
25 *    TEST CASE TOTAL   : 2
26 *
27 *    AUTHOR            : Vatsal Avasthi <vatsal.avasthi@wipro.com>
28 *
29 *    SIGNALS
30 *      Uses SIGUSR1 to pause before test if option set.
31 *      (See the parse_opts(3) man page).
32 *
33 *    DESCRIPTION
34 * 	Tests to verify flock(2) behavior with different locking combinations along
35 *	with LOCK_SH.
36 *    $
37 *	Setup:
38 *        Setup signal handling.
39 *        Pause for SIGUSR1 if option specified.
40 *        Create a temporary directory and chdir to it.
41 * 	  Create a temporary file
42 *
43 *	Test:
44 *	Loop if proper options are given.
45 *		Parent flocks(2) a file
46 *		fork() a child process
47 * 		Child tries to flock() the already flocked file with different types of locks
48 *		Check return code, if system call failed (return == -1)
49 *				Log the error number and issue a FAIL message
50 *		otherwise issue a PASS message
51 *
52 *      Cleanup:
53 *        Print errno log and/or timing stats if options given
54 *	  Deletes temporary directory.
55 *
56 * USAGE:  <for command-line>
57 *      flock04 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
58 *                      where,  -c n : Run n copies concurrently.
59 *                              -f   : Turn off functional testing
60 *    				-e   : Turn on errno logging.
61 *                              -h   : Show help screen                        $
62 *				-i n : Execute test n times.
63 *                              -I x : Execute test for x seconds.
64 *                              -p   : Pause for SIGUSR1 before starting
65 *                              -P x : Pause for x seconds between iterations.
66 *                              -t   : Turn on syscall timing.
67 *
68 ****************************************************************/
69
70#include <errno.h>
71#include <stdio.h>
72#include <unistd.h>
73#include <sys/types.h>
74#include <sys/wait.h>
75#include <sys/file.h>
76#include <sys/stat.h>
77#include <fcntl.h>
78#include "test.h"
79#include "safe_macros.h"
80
81void setup(void);
82void cleanup(void);
83
84char *TCID = "flock04";
85int TST_TOTAL = 2;
86char filename[100];
87int fd, fd1, status;
88
89int main(int argc, char **argv)
90{
91	int lc, retval;
92	pid_t pid;
93
94	tst_parse_opts(argc, argv, NULL, NULL);
95
96	setup();
97
98	for (lc = 0; TEST_LOOPING(lc); lc++) {
99
100		tst_count = 0;
101
102		TEST(flock(fd, LOCK_SH));
103		if (TEST_RETURN == 0) {
104
105			pid = FORK_OR_VFORK();
106			if (pid == -1)
107				tst_brkm(TBROK | TERRNO, cleanup,
108					 "fork failed");
109			if (pid == 0) {
110				fd1 = open(filename, O_RDONLY);
111				retval = flock(fd1, LOCK_SH | LOCK_NB);
112				if (retval == -1)
113					tst_resm(TFAIL,
114						 "flock() FAILED to acquire shared lock on existing "
115						 "Share Locked file");
116				else
117					tst_resm(TPASS,
118						 "flock() PASSED in acquiring shared lock on "
119						 "Share Locked file");
120				exit(0);
121			} else {
122				SAFE_WAIT(cleanup, &status);
123			}
124
125			pid = FORK_OR_VFORK();
126			if (pid == -1)
127				tst_brkm(TBROK | TERRNO, cleanup,
128					 "fork failed");
129
130			if (pid == 0) {
131				fd1 = open(filename, O_RDWR);
132				retval = flock(fd1, LOCK_EX | LOCK_NB);
133				if (retval == -1) {
134					tst_resm(TPASS,
135						 "flock() failed to acquire exclusive lock on existing "
136						 "share locked file as expected");
137				} else {
138					tst_resm(TFAIL,
139						 "flock() unexpectedly passed in acquiring exclusive lock on "
140						 "Share Locked file");
141				}
142				exit(0);
143			} else if (wait(&status) == -1)
144				tst_resm(TBROK | TERRNO, "wait failed");
145			TEST(flock(fd, LOCK_UN));
146		} else
147			tst_resm(TFAIL | TERRNO, "flock failed");
148
149		close(fd);
150		close(fd1);
151	}
152
153	cleanup();
154	tst_exit();
155}
156
157void setup(void)
158{
159
160	tst_sig(FORK, DEF_HANDLER, cleanup);
161
162	TEST_PAUSE;
163
164	tst_tmpdir();
165
166	sprintf(filename, "flock04.%d", getpid());
167
168	fd = open(filename, O_CREAT | O_TRUNC | O_RDWR, 0666);
169	if (fd == -1)
170		tst_brkm(TFAIL, cleanup, "creating a new file failed");
171}
172
173void cleanup(void)
174{
175	unlink(filename);
176
177	tst_rmdir();
178}
179