1. 示例
- /*exec函数示例*/
- #include <stdio.h>
- #include <unistd.h>
- int main(void)
- {
- int flag;
- pid_t pid;
- char *const argv[] = {“%U”, “–user-data-dir=/home/Administrator/.chromiun”, NULL};
- //exec把当前进程印象替换成新的程序文件,故调用进程被覆盖
- // 如果不指定全路径,则只检查PATH变量中存储的命令
- if((pid = fork())==0) {
- printf(“in child process 1……\n”);
- //flag = execvp(“./hello”, NULL);
- //envp变量的用
- char *envp[]={“PATH=.”, NULL};
- flag = execve(“hello”, NULL, envp);
- if(flag == -1)
- printf(“exec error!\n”);
- }
- if((pid = fork())==0) {
- printf(“in child process 2……\n”);
- //执行ls命令
- flag = execlp(“ls”, “-al”, NULL);
- if(flag == -1)
- printf(“exec error!\n”);
- }
- if((pid = fork())==0) {
- printf(“in child process 3……\n”);
- //启动chrome浏览器
- flag = execv(“/usr/bin/chromium-browser”, argv);
- if(flag == -1)
- printf(“exec error!\n”);
- }
- printf(“in parent process ……\n”);
- return 0;
- }
2. hello程序
- #include <stdio.h>
- int main(void)
- {
- printf(“Hello world!\n”);
- return 0;
- }
- root@Ubuntu:…/Linux_C/Process# ./exec_t
- in child process 1……
- in parent process ……
- in child process 3……
- root@ubuntu:…/Linux_C/Process# in child process 2……
- Hello world!
- exec_t fifo_read.c fork_1.c hello.c msg_send.c signal_1.c
- exec_t.c fifo_write.c hello msg_receive.c semop_P_V.c
- 已在现有的浏览器会话中创建新的窗口。