bind.c

#include "bind.h"

#include <signal.h>
#include <string.h>

#include <arpa/inet.h>

int create_listen_socket(uint16_t port) {
    signal(SIGPIPE, SIG_IGN);
    if (port == 0) {
        return -1;
    }
    struct sockaddr_in addr;
    int listenfd = socket(AF_INET, SOCK_STREAM, 0);
    if (listenfd < 0) {
        return -2;
    }
    memset(&addr, 0, sizeof addr);
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htons(INADDR_ANY);
    addr.sin_port = htons(port);
    if (bind(listenfd, (struct sockaddr *) &addr, sizeof addr) < 0) {
        return -3;
    }
    if (listen(listenfd, 500) < 0) {
        return -4;
    }
    return listenfd;
}