source: trunk/minix/lib/ip/shutdown.c@ 21

#include <errno.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>

#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>

#define DEBUG 1

static int _tcp_shutdown(int socket, int how);

int shutdown(int socket, int how)
{
        int r;
        nwio_tcpconf_t tcpconf;

        r= ioctl(socket, NWIOGTCPCONF, &tcpconf);
        if (r != -1 || errno != ENOTTY)
        {
                if (r == -1)
                {
                        /* Bad file descriptor */
                        return -1;
                }
                return _tcp_shutdown(socket, how);
        }
#if DEBUG
        fprintf(stderr, "shutdown: not implemented for fd %d\n", socket);
#endif
        errno= ENOSYS;
        return -1;
}

static int _tcp_shutdown(int socket, int how)
{
        int r;

        if (how == SHUT_WR || how == SHUT_RDWR)
        {
                r= ioctl(socket, NWIOTCPSHUTDOWN, NULL);
                if (r == -1)
                        return -1;
                if (how == SHUT_WR)
                        return 0;
        }

        /* We can't shutdown the read side of the socket. */
        errno= ENOSYS;
        return -1;
}