kc3-lang/gnulib/lib/read.c

• Show log

  Commit

• Hash : acc203f3
  Author :
  Date : 2011-04-15T01:02:13
  

  Support non-blocking pipe I/O in read() on native Windows.
  
  * lib/unistd.in.h: Include <sys/types.h> also for 'read'.
  (read): New declaration.
  * lib/read.c: New file.
  * lib/stdio.in.h (_GL_ATTRIBUTE_FORMAT_SCANF,
  _GL_ATTRIBUTE_FORMAT_SCANF_SYSTEM): New macros.
  (fgetc, fgets, fread, fscanf, getc, getchar, gets, scanf, vfscanf,
  vscanf): New declarations.
  * lib/stdio-read.c: New file.
  * m4/read.m4: New file.
  * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize GNULIB_READ,
  REPLACE_READ.
  * m4/stdio_h.m4 (gl_STDIO_H): Set GNULIB_FGETC, GNULIB_FGETS,
  GNULIB_FREAD, GNULIB_FSCANF, GNULIB_GETC, GNULIB_GETCHAR, GNULIB_GETS,
  GNULIB_SCANF, GNULIB_VFSCANF, GNULIB_VSCANF. In non-blocking I/O is
  desired and needs workarounds, set REPLACE_STDIO_READ_FUNCS.
  (gl_STDIO_H_DEFAULTS): Initialize GNULIB_FGETC, GNULIB_FGETS,
  GNULIB_FREAD, GNULIB_FSCANF, GNULIB_GETC, GNULIB_GETCHAR, GNULIB_GETS,
  GNULIB_SCANF, GNULIB_VFSCANF, GNULIB_VSCANF, REPLACE_STDIO_READ_FUNCS.
  * modules/read: New file.
  * modules/nonblocking (Files): Add lib/stdio-read.c.
  * modules/unistd (Makefile.am): Substitute GNULIB_READ, REPLACE_READ.
  * modules/stdio (Makefile.am): Substitute GNULIB_FGETC, GNULIB_FGETS,
  GNULIB_FREAD, GNULIB_FSCANF, GNULIB_GETC, GNULIB_GETCHAR, GNULIB_GETS,
  GNULIB_SCANF, GNULIB_VFSCANF, GNULIB_VSCANF, REPLACE_STDIO_READ_FUNCS.
  * modules/pread (Depends-on): Add read.
  * modules/safe-read (Depends-on): Likewise.
  * tests/test-stdio-c++.cc (fgetc, fgets, fread, fscanf, getc, getchar,
  gets, scanf, vfscanf, vscanf): Verify signatures.
  * doc/posix-functions/read.texi: Mention 'nonblocking' module and
  problem with non-blocking pipes.
  * doc/posix-functions/fgetc.texi: Likewise.
  * doc/posix-functions/fgets.texi: Likewise.
  * doc/posix-functions/fread.texi: Likewise.
  * doc/posix-functions/fscanf.texi: Likewise.
  * doc/posix-functions/getc.texi: Likewise.
  * doc/posix-functions/getchar.texi: Likewise.
  * doc/posix-functions/gets.texi: Likewise.
  * doc/posix-functions/scanf.texi: Likewise.
  * doc/posix-functions/vfscanf.texi: Likewise.
  * doc/posix-functions/vscanf.texi: Likewise.
  

Download

• lib/read.c

• /* POSIX compatible read() function.
     Copyright (C) 2008-2011 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2011.
  
     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/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  /* Replace this function only if module 'nonblocking' is requested.  */
  #if GNULIB_NONBLOCKING
  
  # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  
  #  include <errno.h>
  #  include <io.h>
  
  #  define WIN32_LEAN_AND_MEAN  /* avoid including junk */
  #  include <windows.h>
  
  ssize_t
  rpl_read (int fd, void *buf, size_t count)
  #undef read
  {
    ssize_t ret = read (fd, buf, count);
  
    if (ret < 0
        && GetLastError () == ERROR_NO_DATA)
      {
        HANDLE h = (HANDLE) _get_osfhandle (fd);
        if (GetFileType (h) == FILE_TYPE_PIPE)
          {
            /* h is a pipe or socket.  */
            DWORD state;
            if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0)
                && (state & PIPE_NOWAIT) != 0)
              /* h is a pipe in non-blocking mode.
                 Change errno from EINVAL to EAGAIN.  */
              errno = EAGAIN;
          }
      }
    return ret;
  }
  
  # endif
  #endif
  

Download