C语言实现管道通讯

mkfifo.c文件

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

int main()
{
    //int mkfifo(const char *pathname, mode_t mode);

    int ret=mkfifo("./test",0777);
    if(ret<0)
    {
        if(errno==EEXIST)
        {
            printf("create error errno=%d\n",errno);
            return -1;
        }
    }
}

link.h文件

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
typedef struct student
{
    int id;
    char name[20];
    struct student *next;
}STU,*Pstu;

Pstu add_node(Pstu head);
void show_link(Pstu head);
void write_link(Pstu head,int fd);
Pstu read_link(int fd);

link.c文件

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include"link.h"

Pstu add_node(Pstu head)
{
    Pstu temp=(Pstu)malloc(sizeof(STU));
    printf("please input id:");
    scanf("%d",&temp->id);
    printf("please input name:");
    scanf("%s",temp->name);
    temp->next=head;
    return temp;
}

void show_link(Pstu head)
{
    printf("id\tname\n");
    while(head!=NULL)
    {
        printf("%d\t%s\n",head->id,head->name);
        head=head->next;
    }
}
Pstu read_link(int fd)
{
    int ret;
    Pstu temp,head=NULL;
    while(1)
    {
        temp=(Pstu)malloc(sizeof(STU));
        ret=read(fd,temp,sizeof(STU));
        if(ret<0)
        {
            printf("read error\n");
            return NULL;
        }
        else if(ret==0)
            return head;
        else
        {
            temp->next=head;
            head=temp;
        }
    }
}
void write_link(Pstu head,int fd)
{
    while(head!=NULL)
    {
        write(fd,head,sizeof(STU));
        head=head->next;
    }
}

write.c文件

#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<string.h>
#include"link.h"
int main()
{
    int fd;
    fd=open("./test",O_WRONLY);
    if(fd<0)
    {
        printf("open filed\n");
        return -1;
    }
    Pstu head=NULL;
    for(int i=0;i<5;i++)
    {
        head=add_node(head);
    }
    show_link(head);

    write_link(head,fd);
    close(fd);
}

read.c文件

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

int main()
{
    int fd;
    fd=open("./test",O_RDONLY);
    if(fd<0)
    {
        printf("open failed\n");
        return -1;
    }

    Pstu head=read_link(fd);
    show_link(head);

    close(fd);
}

gcc mkfifo.c

./aou.t 生成 test

gcc link.c write.c -o write

gcc link.c read.c -o read

运行read和write，效果如下图：