servaccept.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"

/* Wait for a client connection to arrive, and accept it.
 * We also obtain the client's user ID. */

int            /* returns new fd if all OK, -1 on error */
serv_accept(int listenfd, uid_t *uidptr)
{
    struct strrecvfd    recvfd;

    if (ioctl(listenfd, I_RECVFD, &recvfd) < 0)
        return(-1);        /* could be EINTR if signal caught */

    if (uidptr != NULL)
        *uidptr = recvfd.uid;    /* effective uid of caller */

    return(recvfd.fd);    /* return the new descriptor */
}