问题描述

多客户socket出现fork: Resource temporarily unavailable

server端代码如下：
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "multiple_socket.h"

int main()
{
int server_sockfd,client_fd;
struct sockaddr_in server_addr, client_addr;
socklen_t server_len, client_len;

/* Create an unnamed socket for server */
server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

/* Name the socket */
server_addr.sin_family = AF_INET;
server_addr.sin_port = SIN_PORT;
server_addr.sin_addr.s_addr = inet_addr(LOOPBACK);
server_len = sizeof(server_addr);
bind(server_sockfd, (struct sockaddr *)&server_addr, server_len);

/* Create a connection queue & wait for clients */
listen(server_sockfd, SOCKET_QUEUE_SIZE);
signal(SIGCHLD, SIG_IGN);

while(1) {
    char ch;
    if(0 == fork()) {
        /* Accept a connection */
        client_len = sizeof(server_addr);
        client_fd = accept(server_sockfd,
            (struct sockaddr *)&client_addr, &client_len);

        read(client_fd, &ch, 1);
        sleep(SLEEP_TIME);
        ch++;
        write(client_fd, &ch, 1);
        close(client_fd);
        exit(0);
    }
}

return 0;

}

解决方案

你这样循环的创建子进程，导致资源不足，所以报这样的错误，应该在accept之后fork

解决方案二：

这样等待链接资源消耗太狠了，应该链接成功一路开启一个子进程才合理，建议还是不要用多进程，还是多线程更为舒服用起来