mywaitpid.c

关于进程间通信的代码集锦

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

int main()
{
	pid_t pc[2],pr;
	pr=0;
	int i;
	for(i=0;i<2;i++)
	{
		pc[i]=fork();
		printf("Result is %d.child ID is %d.Parent ID is %d.\n",pc[i],getpid(),getppid());
		if(pc[i]<0)
		{
			printf("Error fork.\n");
		}
	}
	while(!pr)
	{
		pr=waitpid(-1,NULL,WNOHANG);
/*		if(pr==0)
		{
			printf("The child processes not exit.\n");
		}*/
	}
	if(pr>0)
	{
		printf("Get child %d\n",pr);
	}
	else if(pr==-1)
	{
		printf("In child process.\n");
	}
	else
	{
		printf("some error occured.\n");
	}
	return 0;
}