1 /*
2  * Copyright (c) Wipro Technologies Ltd, 2003.  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	: clock_settime02
20  *
21  *    EXECUTED BY	: root / superuser
22  *
23  *    TEST TITLE	: Basic test for clock_settime(2)
24  *
25  *    TEST CASE TOTAL	: 1
26  *
27  *    AUTHOR		: Aniruddha Marathe <aniruddha.marathe@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  *     This is a Phase I test for the clock_settime(2) system call.
35  *     It is intended to provide a limited exposure of the system call.
36  *
37  * 	Setup:
38  *	  Setup signal handling.
39  *	  Pause for SIGUSR1 if option specified.
40  *
41  * 	Test:
42  *	 Loop if the proper options are given.
43  *	 Set the parameters of timespec struct
44  *	 Execute system call
45  *	 Check return code, if system call failed (return=-1)
46  *		Log the errno and Issue a FAIL message.
47  *	 Otherwise, Issue a PASS message.
48  *
49  * 	Cleanup:
50  * 	  Print errno log and/or timing stats if options given
51  *
52  * USAGE:  <for command-line>
53  * clock_settime02 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-p]
54  * where:
55  * 	-c n : Run n copies simultaneously.
56  *	-e   : Turn on errno logging.
57  *	-i n : Execute test n times.
58  *	-I x : Execute test for x seconds.
59  *	-p   : Pause for SIGUSR1 before starting
60  *	-P x : Pause for x seconds between iterations.
61  *	-t   : Turn on syscall timing.
62  *
63  *RESTRICTIONS:
64  * None
65  *****************************************************************************/
66 
67 #include <stdlib.h>
68 #include <errno.h>
69 #include <time.h>
70 #include <signal.h>
71 
72 #include "test.h"
73 #include "common_timers.h"
74 
75 static void setup(void);
76 static void cleanup(void);
77 
78 char *TCID = "clock_settime02";
79 int TST_TOTAL = 1;
80 static struct timespec saved;
81 
82 int main(int ac, char **av)
83 {
84 	int lc;
85 	struct timespec spec;
86 
87 	tst_parse_opts(ac, av, NULL, NULL);
88 
89 	setup();
90 
91 	for (lc = 0; TEST_LOOPING(lc); lc++) {
92 
93 		tst_count = 0;
94 
95 		spec.tv_sec = saved.tv_sec + 1;
96 		spec.tv_nsec = 0;
97 
98 		TEST(ltp_syscall(__NR_clock_settime, CLOCK_REALTIME, &spec));
99 		tst_resm((TEST_RETURN < 0 ? TFAIL | TTERRNO : TPASS),
100 			 "clock_settime %s",
101 			 (TEST_RETURN == 0 ? "passed" : "failed"));
102 	}
103 
104 	cleanup();
105 	tst_exit();
106 }
107 
108 static void setup(void)
109 {
110 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
111 
112 	tst_require_root();
113 
114 	/* Save the current time specifications */
115 	if (ltp_syscall(__NR_clock_gettime, CLOCK_REALTIME, &saved) < 0)
116 		tst_brkm(TBROK, NULL, "Could not save the current time");
117 
118 	TEST_PAUSE;
119 }
120 
121 static void cleanup(void)
122 {
123 	/* Set the saved time */
124 	if (clock_settime(CLOCK_REALTIME, &saved) < 0) {
125 		tst_resm(TWARN, "FATAL COULD NOT RESET THE CLOCK");
126 		tst_resm(TFAIL, "Error Setting Time, errno=%d", errno);
127 	}
128 }
129