参考  (129条消息) linux c 使用fifo管道进行多线程间通信_土豆西瓜大芝麻的博客-CSDN博客_多线程fifo

稍作修改

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

//编译    gcc -o t03_testfifo t03_testfifo.c -lpthread
 
void *thread_fun_write(void *p)
{
    char *buf = "12345\n"; //加上\0一共7个字符
    int fd;
    fd = open("./myfifo",O_WRONLY);
    if(fd == -1)
    {
        printf("write fifo open fail....\n");
        exit(-1);
        return NULL;
    }
    while(1)
    {
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        write( fd, buf, strlen(buf)+1 );
        printf("write ok\n");
        sleep(2);
    }
    close(fd);
    return NULL;
}
void *thread_fun_read(void *p)
{
 
    int fd;
 
    fd = open("./myfifo", O_RDONLY );
    if(fd == -1)
    {
        printf("read fifo open fail...\n");            
        exit(-1);
        return NULL;
    }
    char buf[1024] = {0};
    int num;//保存读取数据的大小
    while(1)
    {
        memset(buf,0,1024);
        num = read( fd, buf, 1024 );
        printf("read ok num:%d\n",num);
        for(int i=0;i<num;i++){
            printf("%c",buf[i]);
        }
        puts(buf);
    }
    close(fd);
    return NULL;
}
int main()
{
    printf("test fifo v1.0.3 \n");
    
    //创建有名管道，如果管道存在则直接使用
    int n = mkfifo("./myfifo",0664);
    if( n < 0 && errno!=EEXIST)
    {
        perror("mkfifo");
        return -1;
    }
    //创建线程
    pthread_t writeId,readId;
    pthread_create( &writeId, NULL, thread_fun_write, NULL );
    pthread_create( &readId, NULL, thread_fun_read, NULL);
 
    pthread_join(writeId,NULL);
    pthread_join(readId,NULL);
    while(1);
    return 0;
}

//