waitpid函数实例

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<unistd.h>
int main(void)
{
pid_t pc,pr;
if((pc=fork())==-1)
{
printf("failed to create a new process\n");
exit(0);
}
else if(pc==0)
{
sleep(10);
exit(0);
}

do {
pr=waitpid(pc,NULL,WNOHANG);
if(pr==0)
{
printf("No child exited\n");
sleep(1);
}
}while(pr==0);

if(pr==pc)
{
printf("successfully get child %d\n",pr);
}
else
{
printf("some error occured\n");
}
return 0;
}