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 case for assertion #25 of the sigaction system call that verifies
9 that when the sa_sigaction signal-catching function is entered, then
10 the signal that was caught is added to the signal mask by raising that
11 signal in the signal handler and verifying that the handler is not
12 reentered.
13
14 Steps:
15 1. Fork a new process
16 2. (parent) wait for child
17 3. (child) Setup a signal handler for SIGTTIN
18 4. (child) raise SIGTTIN
19 5. (child, signal handler) increment handler count
20 6. (child, signal handler) if count is 1 then raise SIGTTIN
21 7. (child, signal handler) if count is 2 then set error variable
22 8. (child) if error is set then return -1, else return 0
23 6. (parent - returning from wait) If child returned 0 then exit 0,
24 otherwise exit -1.
25 */
26
27 #include <signal.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <sys/wait.h>
31 #include <unistd.h>
32 #include "posixtest.h"
33
34 int handler_count = 0;
35 int handler_error = 0;
36
handler(int signo LTP_ATTRIBUTE_UNUSED)37 void handler(int signo LTP_ATTRIBUTE_UNUSED)
38 {
39 static int inside_handler = 0;
40
41 printf("SIGTTIN caught\n");
42 if (inside_handler) {
43 printf("Signal caught while inside handler\n");
44 handler_error++;
45 exit(-1);
46 }
47
48 inside_handler++;
49 handler_count++;
50
51 if (handler_count == 1) {
52 printf("Raising SIGTTIN\n");
53 raise(SIGTTIN);
54 printf("Returning from raising SIGTTIN\n");
55 }
56
57 inside_handler--;
58 }
59
main(void)60 int main(void)
61 {
62 if (fork() == 0) {
63 /* child */
64
65 struct sigaction act;
66
67 act.sa_handler = handler;
68 act.sa_flags = 0;
69 sigemptyset(&act.sa_mask);
70 if (sigaction(SIGTTIN, &act, 0) == -1) {
71 perror("Unexpected error while attempting to "
72 "setup test pre-conditions");
73 return PTS_UNRESOLVED;
74 }
75
76 if (raise(SIGTTIN) == -1) {
77 perror("Unexpected error while attempting to "
78 "setup test pre-conditions");
79 return PTS_UNRESOLVED;
80 }
81
82 if (handler_error)
83 return PTS_UNRESOLVED;
84
85 return PTS_PASS;
86 } else {
87 int s;
88
89 /* parent */
90 if (wait(&s) == -1) {
91 perror("Unexpected error while setting up test "
92 "pre-conditions");
93 return PTS_UNRESOLVED;
94 }
95
96 if (!WEXITSTATUS(s)) {
97 printf("Test PASSED\n");
98 return PTS_PASS;
99 }
100 }
101
102 printf("Test FAILED\n");
103 return PTS_FAIL;
104 }
105