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glibc  2.9
getsockopt.c
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00001 /* Copyright (C) 1992,94,97,2001,02 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <sys/socket.h>
00021 #include <hurd.h>
00022 #include <hurd/fd.h>
00023 #include <hurd/socket.h>
00024 #include <string.h>
00025 
00026 /* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
00027    into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's
00028    actual length.  Returns 0 on success, -1 for errors.  */
00029 
00030 /* XXX should be __getsockopt ? */
00031 int
00032 getsockopt (int fd,
00033            int level,
00034            int optname,
00035            void *optval,
00036            socklen_t *optlen)
00037 {
00038   error_t err;
00039   char *buf = optval;
00040   mach_msg_type_number_t buflen = *optlen;
00041 
00042   if (err = HURD_DPORT_USE (fd, __socket_getopt (port,
00043                                            level, optname,
00044                                            &buf, &buflen)))
00045     return __hurd_dfail (fd, err);
00046 
00047   if (*optlen > buflen)
00048     *optlen = buflen;
00049   if (buf != optval)
00050     {
00051       memcpy (optval, buf, *optlen);
00052       __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
00053     }
00054 
00055   return 0;
00056 }