UNIX环境高级编程学习之第十五章进程间通信 – 通过有名管道(命名管道)实现进程间通信

/* User:Lixiujie    
 * Date:20100820
 * Desc:通过有名管道实现进程间通信
 * File:writeFifo.c  
 * gcc writeFifo.c -o writeFifo
 */    
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>

int main(void){
        int fd = open("fifo", O_WRONLY);
        if (fd < 0){
                mode_t mode = 0666;
                if (mkfifo("fifo", mode) < 0){
                        perror("mkfifo failed!");
                        exit(1);
                }
                fd = open("fifo", O_WRONLY);
                if (fd < 0){
                        perror("open failed!");
                        exit(1);
                }
        }
        int i;
        time_t t;
        for (i = 0;i < 10;i++){
                char szBuf[512] = { 0x00 };
                time(&t);
                sprintf(szBuf, "writeFifo %d Send:%s", getpid(), ctime(&t));
                if (write(fd, szBuf, strlen(szBuf) + 1) < 0){
                        perror("write failed!");
                        exit(1);
                }
                sleep(3);
        }
        close(fd);
        return 0;
}