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 int child_continued = 0;
31 int waiting = 1;
32
handler(int signo,siginfo_t * info,void * context)33 void handler(int signo, siginfo_t * info, void *context)
34 {
35 if (info && info->si_code == CLD_CONTINUED) {
36 printf("Child has been stopped\n");
37 waiting = 0;
38 child_continued++;
39 }
40 }
41
main(void)42 int main(void)
43 {
44 pid_t pid;
45 struct sigaction act;
46 struct timeval tv;
47
48 act.sa_sigaction = handler;
49 act.sa_flags = SA_SIGINFO;
50 sigemptyset(&act.sa_mask);
51 sigaction(SIGCHLD, &act, 0);
52
53 if ((pid = fork()) == 0) {
54 /* child */
55 while (1) {
56 /* wait forever, or until we are
57 interrupted by a signal */
58 tv.tv_sec = 0;
59 tv.tv_usec = 0;
60 select(0, NULL, NULL, NULL, &tv);
61 }
62 return 0;
63 } else {
64 /* parent */
65 int s;
66 int i;
67
68 /* delay to allow child to get into select call */
69 tv.tv_sec = 1;
70 tv.tv_usec = 0;
71 select(0, NULL, NULL, NULL, &tv);
72
73 for (i = 0; i < NUMSTOPS; i++) {
74 struct timeval tv;
75 printf("--> Sending SIGSTOP\n");
76 kill(pid, SIGSTOP);
77
78 /*
79 Don't let the kernel optimize away queued
80 SIGSTOP/SIGCONT signals.
81 */
82 tv.tv_sec = 1;
83 tv.tv_usec = 0;
84 select(0, NULL, NULL, NULL, &tv);
85
86 printf("--> Sending SIGCONT\n");
87 waiting = 1;
88 kill(pid, SIGCONT);
89 while (waiting) {
90 tv.tv_sec = 1;
91 tv.tv_usec = 0;
92 if (!select(0, NULL, NULL, NULL, &tv))
93 break;
94 }
95
96 }
97
98 kill(pid, SIGKILL);
99 waitpid(pid, &s, 0);
100 }
101
102 if (child_continued == NUMSTOPS) {
103 printf("Test PASSED\n");
104 printf
105 ("In the section of the POSIX spec that describes the SA_NOCLDSTOP flag in the sigaction() interface "
106 "it is specified that if the SA_NOCLDSTOP flag is not set in sa_flags, then a SIGCHLD and a SIGCHLD "
107 "signal **MAY** be generated for the calling process whenever any of its stopped child processes are continued. "
108 "Because of that, this test will PASS either way, but note that the signals implementation you are currently "
109 "run this test on DOES choose to send a SIGCHLD signal whenever any of its stopped child processes are "
110 "continued. Again, this is not a bug because of the existence of the word *MAY* in the spec.\n");
111 return PTS_PASS;
112 }
113
114 printf("Test PASSED\n");
115
116 printf
117 ("In the section of the POSIX spec that describes the SA_NOCLDSTOP flag in the sigaction() interface "
118 "it is specified that if the SA_NOCLDSTOP flag is not set in sa_flags, then a SIGCHLD and a SIGCHLD "
119 "signal **MAY** be generated for the calling process whenever any of its stopped child processes are continued. "
120 "Because of that, this test will PASS either way, but note that the signals implementation you are currently "
121 "run this test on chooses NOT TO send a SIGCHLD signal whenever any of its stopped child processes are "
122 "continued. Again, this is not a bug because of the existence of the word *MAY* in the spec.\n");
123 return PTS_PASS;
124 }
125