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Subject: unix socket hang when connect
Date: Mon,  7 Apr 2025 15:08:32 +0800
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From: Yuyi Wang via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Yuyi Wang <Strawberry_Str AT hotmail DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Below is a simple unix socket testing code. It creates a unix socket server and
a client to connect to it immediately. It works on Linux and macOS, but hangs on
cygwin. bind + listen work well, but seems that the connect method never returns.


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>

#define SOCKET_PATH "/tmp/example_socket"

int main() {
    int server_fd, client_fd;
    struct sockaddr_un server_addr;
    socklen_t client_len;

    server_fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (server_fd == -1) {
        perror("server socket");
        exit(EXIT_FAILURE);
    }

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sun_family = AF_UNIX;
    strncpy(server_addr.sun_path, SOCKET_PATH, sizeof(server_addr.sun_path) - 1);

    if (bind(server_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
        perror("bind");
        exit(EXIT_FAILURE);
    }

    if (listen(server_fd, 1) == -1) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    printf("Server is listening on %s\n", SOCKET_PATH);

    client_fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (client_fd == -1) {
        perror("client socket");
        exit(EXIT_FAILURE);
    }

    if (connect(client_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1) {
        perror("connect");
        exit(EXIT_FAILURE);
    }

    printf("Client connected to server\n");

    close(client_fd);
    close(server_fd);
    unlink(SOCKET_PATH);

    return 0;
}

--
Sincerely,
Yuyi Wang

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