1  /* Copyright (C) 1991-2023 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     <https://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)
      49  libc_hidden_weak (write)