进程间通讯：有名管道FIFO

接收端：

#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>

#define MKFIFO "./myfifo"
int main()
{
    int ret;
    ret = mkfifo (MKFIFO,0640);//创建有名管道文件
    if((ret < 0)&&errno != EEXIST)
    {
        printf("error
");
    }
    int fd = open (MKFIFO,O_RDWR);//打开文件
    char buff[1024] = {0};
    ret = read (fd,buff,1024);//读取内容
    int fd1 = open ("1.c",O_RDWR | O_CREAT | O_TRUNC,0640);
    write (fd1,buff,ret);
    printf ("recv %s
",buff);
    close (fd);
    close (fd1);
    return 0;
}

发送端：

#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>

#define MKFIFO "./myfifo"
int main()
{
    int ret;
    ret = mkfifo(MKFIFO,0640);//创建管道文件
    if ((ret < 0) && errno != EEXIST)
    {
        perror("mkfifo");
        return -1;
    }
    int fd;
    fd = open (MKFIFO,O_RDWR);//打开管道文件
    char buff[1024] = {0};
    ret = read (0,buff,1024);//从键盘输入
    ret = write (fd,buff,ret);//写到文件
    printf ("sent a msg:%s
",buff);
    close (fd);
    return 0;
}