udp_server.lc

unix网络编程第一卷socket编程书上的全部源代码

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

int##  2 ##src/lib/udp_server.c##
udp_server(const char *host, const char *serv, socklen_t *addrlenp)##  3 ##src/lib/udp_server.c##
{##  4 ##src/lib/udp_server.c##
    int     sockfd, n;##  5 ##src/lib/udp_server.c##
    struct addrinfo hints, *res, *ressave;##  6 ##src/lib/udp_server.c##

    bzero(&hints, sizeof(struct addrinfo));##  7 ##src/lib/udp_server.c##
    hints.ai_flags = AI_PASSIVE;##  8 ##src/lib/udp_server.c##
    hints.ai_family = AF_UNSPEC;##  9 ##src/lib/udp_server.c##
    hints.ai_socktype = SOCK_DGRAM;## 10 ##src/lib/udp_server.c##

    if ((n = getaddrinfo(host, serv, &hints, &res)) != 0)## 11 ##src/lib/udp_server.c##
        err_quit("udp_server error for %s, %s: %s",## 12 ##src/lib/udp_server.c##
                 host, serv, gai_strerror(n));## 13 ##src/lib/udp_server.c##
    ressave = res;## 14 ##src/lib/udp_server.c##

    do {## 15 ##src/lib/udp_server.c##
        sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);## 16 ##src/lib/udp_server.c##
        if (sockfd < 0)## 17 ##src/lib/udp_server.c##
            continue;           /* error, try next one */## 18 ##src/lib/udp_server.c##

        if (bind(sockfd, res->ai_addr, res->ai_addrlen) == 0)## 19 ##src/lib/udp_server.c##
            break;              /* success */## 20 ##src/lib/udp_server.c##

        Close(sockfd);          /* bind error, close and try next one */## 21 ##src/lib/udp_server.c##
    } while ((res = res->ai_next) != NULL);## 22 ##src/lib/udp_server.c##

    if (res == NULL)            /* errno from final socket() or bind() */## 23 ##src/lib/udp_server.c##
        err_sys("udp_server error for %s, %s", host, serv);## 24 ##src/lib/udp_server.c##

    if (addrlenp)## 25 ##src/lib/udp_server.c##
        *addrlenp = res->ai_addrlen;    /* return size of protocol address */## 26 ##src/lib/udp_server.c##

    freeaddrinfo(ressave);## 27 ##src/lib/udp_server.c##

    return (sockfd);## 28 ##src/lib/udp_server.c##
}## 29 ##src/lib/udp_server.c##
/* end udp_server */

int## 30 ##src/lib/udp_server.c##
Udp_server(const char *host, const char *serv, socklen_t *addrlenp)## 31 ##src/lib/udp_server.c##
{## 32 ##src/lib/udp_server.c##
    return (udp_server(host, serv, addrlenp));## 33 ##src/lib/udp_server.c##
}## 34 ##src/lib/udp_server.c##