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glibc  2.9
read_chk.c
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00001 /* Copyright (C) 2005 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 <unistd.h>
00020 #include <sys/param.h>
00021 #ifdef HAVE_INLINED_SYSCALLS
00022 # include <errno.h>
00023 # include <sysdep.h>
00024 #endif
00025 
00026 
00027 ssize_t
00028 __read_chk (int fd, void *buf, size_t nbytes, size_t buflen)
00029 {
00030   if (nbytes > buflen)
00031     __chk_fail ();
00032 
00033 #ifdef HAVE_INLINED_SYSCALLS
00034   return INLINE_SYSCALL (read, 3, fd, buf, nbytes);
00035 #else
00036   return __read (fd, buf, nbytes);
00037 #endif
00038 }