(FIFO)有名管道在无亲缘进程间的通信

原文地址：

两个程序，一写一读，测试有名管道在无亲缘关系的进程间的通信：

读管道程序：main.c

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

#define    FIFO_NAME    "myfifo"
#define    BUF_SIZE    1024

int main(void) {
    int fd;
    char buf[BUF_SIZE];

    umask(0);
    fd = open(FIFO_NAME, O_RDONLY);
    read(fd, buf, BUF_SIZE);
    printf("Read content: %s\n", buf);
    close(fd);
    exit(0);
}

写管道程序：client.c

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

#define    FIFO_NAME    "myfifo"
#define    BUF_SIZE    1024

int main(void) {
    int fd;
    char buf[BUF_SIZE] = "Hello procwrite, I come from process named procread!";

    umask(0);

    if (mkfifo(FIFO_NAME, S_IFIFO | 0666) == -1) {
        perror("mkfifo error!");
        exit(1);
    }


    if ((fd = open(FIFO_NAME, O_WRONLY)) == -1) {   判断是否有打开fifo
        perror("open error!");
        exit(1);
    }


    write(fd, buf, strlen(buf) + 1); /*strlen(buf)+1 是把'\0'也写过去*/

    close(fd);
    //unlink(FIFO_NAME); 删除fifo文件

    exit(0);
}

Makefile

all:main
main:
    gcc -g -Wall -O0 main.c -o main
    
client:
    gcc -g -Wall -O0 client.c -o client
    
clean:
    rm *.o main client
        

运行及输出：
编译后，先运行 client ( 运行后处于阻塞状态 ) 
打开另一个终端运行 main 程序，输出：引用

Read content: Hello procwrite, I come from process named procread!

完