Linux exec函數的使用

1. 示例

1. /*exec函數示例*/
2. #include <stdio.h>
3. #include <unistd.h>
5. int main(void)
6. {
7. int flag;
8. pid_t pid;
9. char *const argv[] = {"%U", "--user-data-dir=/home/Administrator/.chromiun", NULL};
10. //exec把當前進程印象替換成新的程序文件，故調用進程被覆蓋
12. // 如果不指定全路徑，則只檢查PATH變量中存儲的命令
13. if((pid = fork())==0) {
14. printf("in child process 1......\n");
15. //flag = execvp("./hello", NULL);
16. //envp變量的用
17. char *envp[]={"PATH=.", NULL};
18. flag = execve("hello", NULL, envp);
19. if(flag == -1)
20. printf("exec error!\n");
21. }
23. if((pid = fork())==0) {
24. printf("in child process 2......\n");
25. //執行ls命令
26. flag = execlp("ls", "-al", NULL);
27. if(flag == -1)
28. printf("exec error!\n");
29. }
31. if((pid = fork())==0) {
32. printf("in child process 3......\n");
33. //啟動chrome浏覽器
34. flag = execv("/usr/bin/chromium-browser", argv);
35. if(flag == -1)
36. printf("exec error!\n");
37. }
38. printf("in parent process ......\n");
39. return 0;
40. }

1. #include <stdio.h>
3. int main(void)
4. {
5. printf("Hello world!\n");
6. return 0;
7. }

1. root@Ubuntu:.../Linux_C/Process# ./exec_t
2. in child process 1......
3. in parent process ......
4. in child process 3......
5. root@ubuntu:.../Linux_C/Process# in child process 2......
6. Hello world!
7. exec_t fifo_read.c fork_1.c hello.c msg_send.c signal_1.c
8. exec_t.c fifo_write.c hello msg_receive.c semop_P_V.c
9. 已在現有的浏覽器會話中創建新的窗口。