io/write.c

   1 /* Copyright (C) 1991-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <stddef.h>
  22
  23 /* Write NBYTES of BUF to FD.  Return the number written, or -1.  */
  24 ssize_t
  25 __libc_write (int fd, const void *buf, size_t nbytes)
  26 {
  27   if (nbytes == 0)
  28     return 0;
  29   if (fd < 0)
  30     {
  31       __set_errno (EBADF);
  32       return -1;
  33     }
  34   if (buf == NULL)
  35     {
  36       __set_errno (EINVAL);
  37       return -1;
  38     }
  39
  40   __set_errno (ENOSYS);
  41   return -1;
  42 }
  43 libc_hidden_def (__libc_write)
  44 stub_warning (write)
  45
  46 weak_alias (__libc_write, __write)
  47 libc_hidden_weak (__write)
  48 weak_alias (__libc_write, write)