根据unix环境高级编程一书，我们知道管道在读端关闭时，写端继续写会引发SIGPIPE，而在网络（socket）连接的情况下，

如果接收端在发送端正在写的情况下关闭，发送端也会触发SIGPIPE，如果不处理该信号，那么程序就会崩溃。

        测试代码：

        服务端：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/socket.h> 
#include <netinet/in.h> 

#define BUFFER_SIZE 8192

char buffer[BUFFER_SIZE];

void child_handle_send_recieve(int *client_fd);
int main() {
    int rc;
    int socket_fd;

    int client_fd;
    int reuse = 1;

    socket_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (socket_fd < 0) {
        perror("socket initial error");
    }

    struct sockaddr_in addr;
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET;
    addr.sin_port = htons(1989);

    rc = setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
    if (rc < 0) {
        perror("set socket failed.");
    }
    rc = bind(socket_fd, (struct sockaddr*) &addr, sizeof(addr));
    if (rc < 0) {
        perror("bind failed");
    }

    rc = listen(socket_fd, 5);
    if (rc < 0) {
        perror("listen failed");
    }

    while (1) {
        client_fd = rc = accept(socket_fd, NULL, 0);
        if (rc < 0) {
            perror("accept failed");
        }
        int fork_rt;
        if ((fork_rt = fork()) < 0) {
            perror("fork error");
        } else if (fork_rt > 0) { // parent
            close(client_fd);
        } else { // child process.
            close(socket_fd);
            child_handle_send_recieve(&client_fd);
        }
    }
    close(socket_fd);
    return 0;
}

void child_handle_send_recieve(int *client) {
    int client_fd = *client;
    int rc;

    memset(buffer, '\0', sizeof(buffer));
    rc = recv(client_fd, buffer, BUFFER_SIZE, 0);
    if (rc < 0) {
        perror("receive failed");
    }
    printf("received:%s\n", buffer);

    // close it now.
    close(client_fd);
    exit(0);
}


           客户端：

 

 

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <fcntl.h>

#define BUFFER_SIZE 8192

int main(){

    int socket_fd;
    struct sockaddr_in addr;
    char buf[BUFFER_SIZE];
    int rc;
    socket_fd = socket(AF_INET,SOCK_STREAM,0);

    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET;
    addr.sin_port = htons(1989);

    rc = connect(socket_fd, (struct sockaddr*)&addr, sizeof(addr));
    if(rc < 0){
        perror("connect failed");
    }

    bzero(buf, sizeof(buf));
    strncpy(buf,"hello man.",11);
    while(1){
        rc = send(socket_fd, buf,strlen(buf),0);
        if(rc < 0){
            perror("send failed");
        }
    }

    // never can print.
    printf("It's ok here????");
    return 0;
}