如何把这个fifo_read改为非阻塞运行，并接受到exit时结束运行

/* fifo_read.c */
#include <sys/types.h>#include <sys/stat.h>#include <errno.h>#include <fcntl.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <limits.h>

    #define MYFIFO            "/tmp/myfifo"

#define MAX_BUFFER_SIZE PIPE_BUF
int main(){ char buff[MAX_BUFFER_SIZE]; int fd; int nread;
if (access(MYFIFO, F_OK) == -1)
{ if ((mkfifo(MYFIFO, 0666) < 0) && (errno != EEXIST)) { printf("Cannot create fifo file\n"); exit(1); } } fd = open(MYFIFO, O_RDONLY); if (fd == -1) { printf("Open fifo file error\n"); exit(1); } while (1) { memset(buff, 0, sizeof(buff)); if ((nread = read(fd, buff, MAX_BUFFER_SIZE)) > 0) { printf("Read '%s' from FIFO\n", buff); } } close(fd); exit(0);}

这样改试试
fd = open(MYFIFO, O_RDONLY|O_NONBLOCK);