1. 请教fork运行机制－UNIX环境编程学习

先看代码：

#include <sys/types.h>
#include <sys/wait.h>
#include "../ourhdr.h"
int main(int argc, char* argv[])
{
    char buf[MAXLINE] = "";
    pid_t pid = 0;
    int status = 0;
    printf("%% ");
    while(fgets(buf, MAXLINE, stdin) != NULL)
    {
	buf[strlen(buf) - 1] = 0;
	if((pid = fork()) < 0)
	  printf("fork error");
	else if(pid == 0)
	{
	  execlp(buf, buf, (char *)0);
	  printf("couldn't execute: %s", buf);
	  exit(127);
	}
	if((pid = waitpid(pid, &status, 0)) < 0)
	  printf("waitpid error");
	printf("%% ");
    }
    exit(0);
}
#include <sys/types.h>
#include <s</div><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" />
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