servlisten.c

来自「unix环境高级编程的源代码」· C语言 代码 · 共 40 行

#include    <sys/types.h>
#include    <sys/socket.h>
#include    <sys/un.h>
#include    "ourhdr.h"

/* Create a server endpoint of a connection. */

int            /* returns fd if all OK, <0 on error */
serv_listen(const char *name)
{
    int                    fd, len;
    struct sockaddr_un    unix_addr;

                    /* create a Unix domain stream socket */
    if ( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
        return(-1);

    unlink(name);    /* in case it already exists */

                    /* fill in socket address structure */
    memset(&unix_addr, 0, sizeof(unix_addr));
    unix_addr.sun_family = AF_UNIX;
    strcpy(unix_addr.sun_path, name);
#ifdef    SCM_RIGHTS    /* 4.3BSD Reno and later */
    len = sizeof(unix_addr.sun_len) + sizeof(unix_addr.sun_family) +
          strlen(unix_addr.sun_path) + 1;
    unix_addr.sun_len = len;
#else                /* vanilla 4.3BSD */
    len = strlen(unix_addr.sun_path) + sizeof(unix_addr.sun_family);
#endif
                    /* bind the name to the descriptor */
    if (bind(fd, (struct sockaddr *) &unix_addr, len) < 0)
        return(-2);

    if (listen(fd, 5) < 0)    /* tell kernel we're a server */
        return(-3);

    return(fd);
}