tcp_listen.lc

unix网络编程卷1：套接口API的全书源码

/* include tcp_listen */
#include    "unp.h"##  1 ##src/lib/tcp_listen.c##

int##  2 ##src/lib/tcp_listen.c##
tcp_listen(const char *host, const char *serv, socklen_t *addrlenp)##  3 ##src/lib/tcp_listen.c##
{##  4 ##src/lib/tcp_listen.c##
    int     listenfd, n;##  5 ##src/lib/tcp_listen.c##
    const int on = 1;##  6 ##src/lib/tcp_listen.c##
    struct addrinfo hints, *res, *ressave;##  7 ##src/lib/tcp_listen.c##

    bzero(&hints, sizeof(struct addrinfo));##  8 ##src/lib/tcp_listen.c##
    hints.ai_flags = AI_PASSIVE;##  9 ##src/lib/tcp_listen.c##
    hints.ai_family = AF_UNSPEC;## 10 ##src/lib/tcp_listen.c##
    hints.ai_socktype = SOCK_STREAM;## 11 ##src/lib/tcp_listen.c##

    if ((n = getaddrinfo(host, serv, &hints, &res)) != 0)## 12 ##src/lib/tcp_listen.c##
        err_quit("tcp_listen error for %s, %s: %s",## 13 ##src/lib/tcp_listen.c##
                 host, serv, gai_strerror(n));## 14 ##src/lib/tcp_listen.c##
    ressave = res;## 15 ##src/lib/tcp_listen.c##

    do {## 16 ##src/lib/tcp_listen.c##
        listenfd =## 17 ##src/lib/tcp_listen.c##
            socket(res->ai_family, res->ai_socktype, res->ai_protocol);## 18 ##src/lib/tcp_listen.c##
        if (listenfd < 0)## 19 ##src/lib/tcp_listen.c##
            continue;           /* error, try next one */## 20 ##src/lib/tcp_listen.c##

        Setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));## 21 ##src/lib/tcp_listen.c##
        if (bind(listenfd, res->ai_addr, res->ai_addrlen) == 0)## 22 ##src/lib/tcp_listen.c##
            break;              /* success */## 23 ##src/lib/tcp_listen.c##

        Close(listenfd);        /* bind error, close and try next one */## 24 ##src/lib/tcp_listen.c##
    } while ((res = res->ai_next) != NULL);## 25 ##src/lib/tcp_listen.c##

    if (res == NULL)            /* errno from final socket() or bind() */## 26 ##src/lib/tcp_listen.c##
        err_sys("tcp_listen error for %s, %s", host, serv);## 27 ##src/lib/tcp_listen.c##

    Listen(listenfd, LISTENQ);## 28 ##src/lib/tcp_listen.c##

    if (addrlenp)## 29 ##src/lib/tcp_listen.c##
        *addrlenp = res->ai_addrlen;    /* return size of protocol address */## 30 ##src/lib/tcp_listen.c##

    freeaddrinfo(ressave);## 31 ##src/lib/tcp_listen.c##

    return (listenfd);## 32 ##src/lib/tcp_listen.c##
}## 33 ##src/lib/tcp_listen.c##
/* end tcp_listen */

/*## 34 ##src/lib/tcp_listen.c##
 * We place the wrapper function here, not in wraplib.c, because some## 35 ##src/lib/tcp_listen.c##
 * XTI programs need to include wraplib.c, and it also defines## 36 ##src/lib/tcp_listen.c##
 * a Tcp_listen() function.## 37 ##src/lib/tcp_listen.c##
 */## 38 ##src/lib/tcp_listen.c##

int## 39 ##src/lib/tcp_listen.c##
Tcp_listen(const char *host, const char *serv, socklen_t *addrlenp)## 40 ##src/lib/tcp_listen.c##
{## 41 ##src/lib/tcp_listen.c##
    return (tcp_listen(host, serv, addrlenp));## 42 ##src/lib/tcp_listen.c##
}## 43 ##src/lib/tcp_listen.c##