1 /*
2
3 * Copyright (c) 2002-2003, Intel Corporation. All rights reserved.
4 * Created by: rusty.lynch REMOVE-THIS AT intel DOT com
5 * This file is licensed under the GPL license. For the full content
6 * of this license, see the COPYING file at the top level of this
7 * source tree.
8
9 Test case for assertion #22 of the sigaction system call that verifies
10 that if the SA_NODEFER flag is set for a given signal, then when the
11 sa_sigaction signal-catching function is entered, then the signal that
12 was caught is not added to the signal mask by raising that signal in the
13 signal handler and verifying that the handler is reentered.
14
15 Steps:
16 1. Fork a new process
17 2. (parent) wait for child
18 3. (child) Setup a signal handler for SIGCHLD with SA_NODEFER set
19 in the sa_flags field
20 4. (child) raise SIGCHLD
21 5. (child, signal handler) increment handler count
22 6. (child, signal handler) if count is 1 then raise SIGCHLD
23 7. (child, signal handler) if count is 1 then set error variable
24 8. (child) if error is set then return -1, else return 0
25 6. (parent - returning from wait) If child returned 0 then exit 0,
26 otherwise exit -1.
27 */
28
29 #define _XOPEN_SOURCE 600
30
31 #include <signal.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <sys/wait.h>
35 #include <unistd.h>
36 #include "posixtest.h"
37
38 int handler_count = 0;
39
handler(int signo)40 void handler(int signo)
41 {
42 static int inside_handler = 0;
43
44 printf("SIGCHLD caught\n");
45 if (inside_handler) {
46 printf("Signal caught while inside handler\n");
47 exit(0);
48 }
49
50 inside_handler++;
51 handler_count++;
52
53 if (handler_count == 1) {
54 printf("Raising SIGCHLD\n");
55 raise(SIGCHLD);
56 printf("Returning from raising SIGCHLD\n");
57 }
58
59 inside_handler--;
60 }
61
main(void)62 int main(void)
63 {
64 if (fork() == 0) {
65 /* child */
66
67 struct sigaction act;
68
69 act.sa_handler = handler;
70 act.sa_flags = SA_NODEFER;
71 sigemptyset(&act.sa_mask);
72 if (sigaction(SIGCHLD, &act, 0) == -1) {
73 perror("Unexpected error while attempting to "
74 "setup test pre-conditions");
75 return PTS_UNRESOLVED;
76 }
77
78 if (raise(SIGCHLD) == -1) {
79 perror("Unexpected error while attempting to "
80 "setup test pre-conditions");
81 return PTS_UNRESOLVED;
82 }
83
84 return PTS_FAIL;
85 } else {
86 int s;
87
88 /* parent */
89 if (wait(&s) == -1) {
90 perror("Unexpected error while setting up test "
91 "pre-conditions");
92 return PTS_UNRESOLVED;
93 }
94
95 if (!WEXITSTATUS(s)) {
96 printf("Test PASSED\n");
97 return PTS_PASS;
98 }
99 }
100
101 printf("Test FAILED\n");
102 return PTS_FAIL;
103 }
104