管道函数

#inlcude <unistd.h>

int pipe(int fd[2])

上图来自unix网络编程卷二，描述了父子进程通过两个管道进行数据通信。

一个简单父子进程通信的例程：

pipe.h:

#include 
     
       #include 
      
        #include 
       
         void server(int rd,int wr) {
    char buff[100];     ssize_t n; if((n = read(rd,buff,100)) ==0){
            printf("no chars\n"); return;     }     buff[n] ='\0';     printf("%s\n",buff);     write(wr,"Server got it\n",14); } void client(int rd,int wr) {
    int n; char buff[100];     write(wr,"Hello,Server\n",13); while((n = read(rd,buff,100)) >0){
            buff[n] ='\0';         printf("%s\n",buff);     } } int main() {
    int fd1[2]; int fd2[2];     pipe(fd1);     pipe(fd2);     pid_t cldp; if((cldp = fork()) ==0){
            close(fd1[1]);         close(fd2[0]);         server(fd1[0],fd2[1]);         exit(0);     }     close(fd1[0]);     close(fd2[1]);     client(fd2[0],fd1[1]);     waitpid(cldp,NULL,0);     exit(0); }