程序清单 8-8 exec函数实例，a.out是程序8-9产生的可执行程序 

 1 /*
 2  ============================================================================
 3  Name        : test.c
 4  Author      : blank
 5  Version     :
 6  Copyright   : Your copyright notice
 7  Description : 程序清单 8-8 exec函数实例，a.out是程序8-9产生的可执行程序============================================================================
 8 */
 9 
10 #include "ourhdr.h"
11 #include <sys/wait.h>
12 
13 char *evn_init[] = { "USER=unknown", "PATH=/tmp", NULL};
14 int main(int argc, char *argv[])
15 {
16     pid_t pid;
17 
18     if ((pid = fork()) < 0){
19         err_sys("fork error");
20     }else if (pid == 0){
21         // specify pathname, specify environment
22         if (execle("/home/blank/workspace/test/src/a.out", "a.out", "myarg1",
23                 "MY ARG2", (char *)0, evn_init) < 0){
24             err_sys("execel error");
25         }
26     }
27 
28     if (waitpid(pid, NULL, 0) < 0){
29         err_sys("waitpid error");
30     }
31 
32     if ((pid = fork()) < 0){
33         err_sys("fork error");
34     }else if (pid == 0){
35         // specify filename, inherit environment
36         if (execlp("./a.out", "a.out", "only 1 arg", (char *)0) < 0){
37             err_sys("execlp error");
38         }
39     }
40 
41     exit(0);
42 }

 

posted @ 2014-05-05 23:17  blankqdb  阅读(551)  评论(0)    收藏  举报