Unix中pthread()+fork()+execl()解决system()导致主进程阻塞的例子

 

#include <stdlib.h>   
#include <stdio.h>   
#include <unistd.h>
#include <pthread.h>
#include <sys/wait.h>
#include <sys/types.h>

void *thread_execl()
{
	pid_t pid;
	int ret;
	if ((pid = fork()) < 0)
	{
		printf("fork error\n");
	}
	else if (pid == 0)
	{
		execl("/bin/ls", "ls" , "-al", "/etc/passwd", (char*)0);
	} else {
		int status;
		wait(&status);
		ret = WEXITSTATUS(status);
		printf("ret: %d\n", ret);
	}
	pthread_exit(NULL);
}

int main()
{
	pthread_t p_id;
	int ret;
	ret = pthread_create(&p_id, NULL, thread_execl, NULL);
	if (ret != 0)
	{
		printf("create pthread error\n");
	}
	return 0;
}