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 }