Support non-blocking pipe I/O in write() on native Windows. * lib/unistd.in.h (write): Enable replacement also if GNULIB_UNISTD_H_NONBLOCKING is 1. * lib/write.c: Enable replacement also if GNULIB_NONBLOCKING. (rpl_write): When failing to write on a non-blocking pipe, change errno from ENOSPC to EAGAIN. * lib/stdio.in.h (fprintf, fputc, fputs, fwrite, printf, putc, putchar, puts, vfprintf, vprintf): Enable replacement also if GNULIB_STDIO_H_NONBLOCKING is 1. * lib/stdio-write.c: Enable replacements also if GNULIB_NONBLOCKING. (CLEAR_ERRNO, HANDLE_ENOSPC): New macros. (CLEAR_LastError, HANDLE_ERROR_NO_DATA): New macros, extracted from CALL_WITH_SIGPIPE_EMULATION. (CALL_WITH_SIGPIPE_EMULATION): Use them. * m4/nonblocking.m4: New file. * m4/write.m4 (gl_FUNC_WRITE): Enable REPLACE_WRITE also if required for non-blocking I/O support. * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize GNULIB_UNISTD_H_NONBLOCKING. * m4/stdio_h.m4 (gl_STDIO_H): Enable REPLACE_STDIO_WRITE_FUNCS also if required for non-blocking I/O support. (gl_STDIO_H_DEFAULTS): Initialize GNULIB_STDIO_H_NONBLOCKING. * modules/nonblocking (Files): Add m4/nonblocking.m4, lib/stdio-write.c, m4/asm-underscore.m4. (Depends-on): Add stdio, unistd. (configure.ac): Invoke gl_NONBLOCKING_IO. Define GNULIB_NONBLOCKING. Set GNULIB_STDIO_H_NONBLOCKING, GNULIB_UNISTD_H_NONBLOCKING. * modules/unistd (Makefile.am): Substitute GNULIB_UNISTD_H_NONBLOCKING. * modules/stdio (Makefile.am): Substitute GNULIB_STDIO_H_NONBLOCKING. * doc/posix-functions/fprintf.texi: Mention 'nonblocking' module and problem with non-blocking pipes. * doc/posix-functions/fputc.texi: Likewise. * doc/posix-functions/fputs.texi: Likewise. * doc/posix-functions/fwrite.texi: Likewise. * doc/posix-functions/printf.texi: Likewise. * doc/posix-functions/putc.texi: Likewise. * doc/posix-functions/putchar.texi: Likewise. * doc/posix-functions/puts.texi: Likewise. * doc/posix-functions/vfprintf.texi: Likewise. * doc/posix-functions/vprintf.texi: Likewise. * doc/posix-functions/write.texi: Likewise.

/* calloc() function that is glibc compatible.
   This wrapper function is required at least on Tru64 UNIX 5.1 and mingw.
   Copyright (C) 2004-2007, 2009-2011 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* written by Jim Meyering and Bruno Haible */

#include <config.h>
/* Only the AC_FUNC_CALLOC macro defines 'calloc' already in config.h.  */
#ifdef calloc
# define NEED_CALLOC_GNU 1
# undef calloc
/* Whereas the gnulib module 'calloc-gnu' defines HAVE_CALLOC_GNU.  */
#elif GNULIB_CALLOC_GNU && !HAVE_CALLOC_GNU
# define NEED_CALLOC_GNU 1
#endif

/* Specification.  */
#include <stdlib.h>

#include <errno.h>

/* Call the system's calloc below.  */
#undef calloc

/* Allocate and zero-fill an NxS-byte block of memory from the heap.
   If N or S is zero, allocate and zero-fill a 1-byte block.  */

void *
rpl_calloc (size_t n, size_t s)
{
  void *result;

#if NEED_CALLOC_GNU
  if (n == 0 || s == 0)
    {
      n = 1;
      s = 1;
    }
  else
    {
      /* Defend against buggy calloc implementations that mishandle
         size_t overflow.  */
      size_t bytes = n * s;
      if (bytes / s != n)
        {
          errno = ENOMEM;
          return NULL;
        }
    }
#endif

  result = calloc (n, s);

#if !HAVE_CALLOC_POSIX
  if (result == NULL)
    errno = ENOMEM;
#endif

  return result;
}