libc/socket/recvfrom.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <string.h>
  21 #include <sys/socket.h>
  22
  23
  24 int recvfrom (int fd, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
  25 {
  26         unsigned *where;
  27         unsigned *memptr_from = (unsigned *) 0x9010;
  28         where = memptr_from;
  29         *where = (unsigned) from;
  30
  31         asm volatile (
  32                 "movl $48, %%eax;"
  33                 "movl %0, %%ecx;"
  34                 "movl %1, %%ebx;"
  35                 "movl %2, %%edx;"
  36                 "int $0x80;" :: "g" (fd), "b" (buf), "g" (len) : "%eax", "%ecx", "%edx", "memory");
  37
  38
  39         /* get return value */
  40         int *memptr = (int *) 0x9000;
  41         int *ret = memptr;
  42
  43         return (int) *ret;
  44 }
  45