servlisten.c

unix环境高级编程的源代码

#include    <sys/types.h>
#include    <sys/stat.h>
#include    <stropts.h>
#include    "ourhdr.h"

#define    FIFO_MODE  (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
                    /* user rw, group rw, others rw */

int            /* returns fd if all OK, <0 on error */
serv_listen(const char *name)
{
    int        tempfd, fd[2], len;

                    /* create a file: mount point for fattach() */
    unlink(name);
    if ( (tempfd = creat(name, FIFO_MODE)) < 0)
        return(-1);
    if (close(tempfd) < 0)
        return(-2);

    if (pipe(fd) < 0)
        return(-3);
                            /* push connld & fattach() on fd[1] */
    if (ioctl(fd[1], I_PUSH, "connld") < 0)
        return(-4);
    if (fattach(fd[1], name) < 0)
        return(-5);

    return(fd[0]);    /* fd[0] is where client connections arrive */
}