Linux exec函数的使用
1、例子
/*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;}#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