Linux

进程控制 代码(C)


本文地址:http://blog.csdn.net/caroline_wendy


输出进程IDgetpid().

代码:

/*By C.L.Wang
 * Eclipse CDT
 * Ubuntu 12.04
 * 2014.10.5*/

#include "apue.h"
#include "error.h"

int main(void) {
	printf("hello world from process ID %ld
", (long)getpid());
	exit(0);
}

输出:

hello world from process ID 2260


运行命令程序。 fork()创建进程,execlp()运行命令,父进程等待子进程终止waitpid()

代码:

/*By C.L.Wang
 * Eclipse CDT
 * Ubuntu 12.04
 * 2014.10.5*/

#include "apue.h"
#include "error.h"
#include <sys/wait.h>

int main(void) {
	char buf[MAXLINE];
	pid_t pid;
	int status;

	printf("%% ");
	while (fgets(buf, MAXLINE, stdin) != NULL) {
		if (buf[strlen(buf) - 1] == '
') {
			buf[strlen(buf) - 1] = 0;
		}

		if ((pid = fork()) < 0) {
			err_sys("fork error");
		} else if (pid == 0) {
			execlp(buf, buf, (char*) 0);
			err_ret("couldn't execute: %s", buf);
			exit(127);
		}

		if ((pid = waitpid(pid, &status, 0)) < 0)
			err_sys("waitpid error");
		printf("%% ");
	}

	exit(0);
}


输出:





原文地址:https://www.cnblogs.com/lytwajue/p/6761693.html