sysdeps/unix/sysv/linux/read.c

   1 /* Linux read syscall implementation.
   2    Copyright (C) 2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <unistd.h>
  20 #include <sysdep-cancel.h>
  21 #include <not-cancel.h>
  22
  23 /* Read NBYTES into BUF from FD.  Return the number read or -1.  */
  24 ssize_t
  25 __libc_read (int fd, void *buf, size_t nbytes)
  26 {
  27   return SYSCALL_CANCEL (read, fd, buf, nbytes);
  28 }
  29 libc_hidden_def (__libc_read)
  30
  31 libc_hidden_def (__read)
  32 weak_alias (__libc_read, __read)
  33 libc_hidden_def (read)
  34 weak_alias (__libc_read, read)
  35
  36 #if !IS_IN (rtld)
  37 ssize_t
  38 __read_nocancel (int fd, void *buf, size_t nbytes)
  39 {
  40   return INLINE_SYSCALL_CALL (read, fd, buf, nbytes);
  41 }
  42 #else
  43 strong_alias (__libc_read, __read_nocancel)
  44 #endif
  45 libc_hidden_def (__read_nocancel)