1 //http://blog.chinaunix.net/uid-24549279-id-71355.html
2 /*
3 ============================================================================
4 Name : test.c
5 Author : blank
6 Version :
7 Copyright : Your copyright notice
8 Description : 程序清单8-3 8-4 演示不同的exit值
9 ============================================================================
10 */
11
12 #include "ourhdr.h"
13 #include <sys/wait.h>
14
15 static void pr_exit(int status);
16
17 int main(int argc, char *argv[])
18 {
19 pid_t pid;
20 int status;
21
22 if ((pid = fork()) < 0){
23 err_sys("fork error");
24 }else if(pid == 0){
25 //child
26 exit(7);
27 }
28
29 /*
30 * wait for child and print its status
31 */
32 if (wait(&status) != pid){
33 err_sys("wait error");
34 }
35
36 pr_exit(status);
37
38 /*
39 * child generates SIGABRT
40 */
41 if ((pid = fork()) < 0){
42 err_sys("fork_error");
43 }else if (pid == 0){
44 abort();
45 }
46
47 /*
48 * wait for child and print its status
49 */
50 if (wait(&status) != pid){
51 err_sys("wait error");
52 }
53
54 pr_exit(status);
55
56 if ((pid = fork()) < 0){
57 err_sys("fork error");
58 }else if(pid == 0){
59 // child divide by 0 generates SIGFPE
60 status/=0;
61 }
62
63 /*
64 * wait for child and print its status
65 */
66 if (wait(&status) != pid){
67 err_sys("wait error");
68 }
69
70 pr_exit(status);
71 }
72
73 static void pr_exit(int status)
74 {
75 if (WIFEXITED(status)){
76 printf("normal termination, exit status = %d\n", WEXITSTATUS(status));
77 }else if (WIFSIGNALED(status)){
78 printf("abnormal termination, signal number=%d%s\n", WTERMSIG(status),
79 #ifdef WCOREDUMP
80 WCOREDUMP(status) ? " (core file generated )" : "");
81 #else
82 "");
83 #endif
84 }else if(WIFSTOPPED(status)){
85 printf("child stopped, signal number=%d\n", WSTOPSIG(status));
86 }
87 }
