UNIX环境高级编程学习之第八章进程控制-用父子进程实现打开kate，返回kate关闭状态

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
int main()
{
	pid_t pid= fork();
	if (pid < 0)
	{
		printf("fork error msg=%s/n", strerror(errno));
		exit(-1);
	}else if (pid == 0) // clild process 
	{
		execlp("kate", "kate > /dev/null", "./fork.c",(char*)0);
	}else{ // parent process
		int ret;
		waitpid(pid, &ret, 0);
		printf("pid = %u, ret = %d/n", pid, ret);
	}
	return 0;
}