1 /*
2 * Copyright (c) 2002-2003, Intel Corporation. All rights reserved.
3 * Created by: Rusty.Lynch REMOVE-THIS AT intel DOT com
4 * This file is licensed under the GPL license. For the full content
5 * of this license, see the COPYING file at the top level of this
6 * source tree.
7
8 Test assertion #11 by verifying that SIGCHLD signals are sent to a parent
9 when their children are continued after being stopped.
10
11 NOTE: This is only required to work if the XSI options are implemented.
12 * 12/18/02 - Adding in include of sys/time.h per
13 * rodrigc REMOVE-THIS AT attbi DOT com input that it needs
14 * to be included whenever the timeval struct is used.
15 *
16 */
17
18 #include <signal.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <sys/select.h>
22 #include <sys/wait.h>
23 #include <sys/time.h>
24 #include <sys/types.h>
25 #include <unistd.h>
26 #include "posixtest.h"
27
28 #define NUMSTOPS 2
29
30 static volatile int child_continued;
31 static volatile int waiting = 1;
32
handler(int signo PTS_ATTRIBUTE_UNUSED,siginfo_t * info,void * context PTS_ATTRIBUTE_UNUSED)33 static void handler(int signo PTS_ATTRIBUTE_UNUSED, siginfo_t *info,
34 void *context PTS_ATTRIBUTE_UNUSED)
35 {
36 if (info && info->si_code == CLD_CONTINUED) {
37 printf("Child has been stopped\n");
38 waiting = 0;
39 child_continued++;
40 }
41 }
42
main(void)43 int main(void)
44 {
45 pid_t pid;
46 struct sigaction act;
47 struct timeval tv;
48
49 act.sa_sigaction = handler;
50 act.sa_flags = SA_SIGINFO;
51 sigemptyset(&act.sa_mask);
52 sigaction(SIGCHLD, &act, 0);
53
54 if ((pid = fork()) < 0) {
55 printf("fork() did not return success\n");
56 return PTS_UNRESOLVED;
57 } else if (pid == 0) {
58 /* child */
59 while (1) {
60 /* wait forever, or until we are
61 interrupted by a signal */
62 tv.tv_sec = 0;
63 tv.tv_usec = 0;
64 select(0, NULL, NULL, NULL, &tv);
65 }
66 return 0;
67 } else {
68 /* parent */
69 int s;
70 int i;
71
72 /* delay to allow child to get into select call */
73 tv.tv_sec = 1;
74 tv.tv_usec = 0;
75 select(0, NULL, NULL, NULL, &tv);
76
77 for (i = 0; i < NUMSTOPS; i++) {
78 struct timeval tv;
79 printf("--> Sending SIGSTOP\n");
80 kill(pid, SIGSTOP);
81
82 /*
83 Don't let the kernel optimize away queued
84 SIGSTOP/SIGCONT signals.
85 */
86 tv.tv_sec = 1;
87 tv.tv_usec = 0;
88 select(0, NULL, NULL, NULL, &tv);
89
90 printf("--> Sending SIGCONT\n");
91 waiting = 1;
92 kill(pid, SIGCONT);
93 while (waiting) {
94 tv.tv_sec = 1;
95 tv.tv_usec = 0;
96 if (!select(0, NULL, NULL, NULL, &tv))
97 break;
98 }
99
100 }
101
102 kill(pid, SIGKILL);
103 waitpid(pid, &s, 0);
104 }
105
106 if (child_continued == NUMSTOPS) {
107 printf("Test PASSED\n");
108 printf
109 ("In the section of the POSIX spec that describes the SA_NOCLDSTOP flag in the sigaction() interface "
110 "it is specified that if the SA_NOCLDSTOP flag is not set in sa_flags, then a SIGCHLD and a SIGCHLD "
111 "signal **MAY** be generated for the calling process whenever any of its stopped child processes are continued. "
112 "Because of that, this test will PASS either way, but note that the signals implementation you are currently "
113 "run this test on DOES choose to send a SIGCHLD signal whenever any of its stopped child processes are "
114 "continued. Again, this is not a bug because of the existence of the word *MAY* in the spec.\n");
115 return PTS_PASS;
116 }
117
118 printf("Test PASSED\n");
119
120 printf
121 ("In the section of the POSIX spec that describes the SA_NOCLDSTOP flag in the sigaction() interface "
122 "it is specified that if the SA_NOCLDSTOP flag is not set in sa_flags, then a SIGCHLD and a SIGCHLD "
123 "signal **MAY** be generated for the calling process whenever any of its stopped child processes are continued. "
124 "Because of that, this test will PASS either way, but note that the signals implementation you are currently "
125 "run this test on chooses NOT TO send a SIGCHLD signal whenever any of its stopped child processes are "
126 "continued. Again, this is not a bug because of the existence of the word *MAY* in the spec.\n");
127 return PTS_PASS;
128 }
129