kc3-lang/gnulib/lib/lseek.c

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• Hash : 9b604b4c
  Author :
  Date : 2011-09-23T21:38:44
  

  New module 'msvc-nothrow'. Makes _get_osfhandle safe on MSVC 9.
  
  * lib/msvc-nothrow.h: New file.
  * lib/msvc-nothrow.c: New file.
  * m4/msvc-nothrow.m4: New file.
  * modules/msvc-nothrow: New file.
  * lib/dup2.c: Include msvc-nothrow.h.
  (rpl_dup2): No need to protect _get_osfhandle call here.
  * lib/accept4.c: Include msvc-nothrow.h.
  * lib/error.c: Likewise.
  * lib/fcntl.c: Likewise.
  * lib/lseek.c: Likewise.
  * lib/nonblocking.c: Likewise.
  * lib/poll.c: Likewise.
  * lib/read.c: Likewise.
  * lib/select.c: Likewise.
  * lib/sockets.h: Likewise.
  * lib/sockets.c: Likewise.
  * lib/stdio-read.c: Likewise.
  * lib/stdio-write.c: Likewise.
  * lib/write.c: Likewise.
  * lib/w32sock.h: Likewise.
  * lib/w32spawn.h: Likewise.
  * lib/flock.c: Include msvc-nothrow.h instead of <io.h>.
  * lib/fsync.c: Likewise.
  * lib/isapipe.c: Likewise.
  * modules/dup2 (Depends-on): Add msvc-nothrow.
  * modules/accept4 (Depends-on): Likewise.
  * modules/error (Depends-on): Likewise.
  * modules/fcntl (Depends-on): Likewise.
  * modules/lseek (Depends-on): Likewise.
  * modules/nonblocking (Depends-on): Likewise.
  * modules/poll (Depends-on): Likewise.
  * modules/read (Depends-on): Likewise.
  * modules/select (Depends-on): Likewise.
  * modules/sockets (Depends-on): Likewise.
  * modules/sigpipe (Depends-on): Likewise.
  * modules/write (Depends-on): Likewise.
  * modules/accept (Depends-on): Likewise.
  * modules/bind (Depends-on): Likewise.
  * modules/connect (Depends-on): Likewise.
  * modules/gethostname (Depends-on): Likewise.
  * modules/getpeername (Depends-on): Likewise.
  * modules/getsockname (Depends-on): Likewise.
  * modules/getsockopt (Depends-on): Likewise.
  * modules/ioctl (Depends-on): Likewise.
  * modules/listen (Depends-on): Likewise.
  * modules/recv (Depends-on): Likewise.
  * modules/recvfrom (Depends-on): Likewise.
  * modules/send (Depends-on): Likewise.
  * modules/sendto (Depends-on): Likewise.
  * modules/setsockopt (Depends-on): Likewise.
  * modules/shutdown (Depends-on): Likewise.
  * modules/socket (Depends-on): Likewise.
  * modules/execute (Depends-on): Likewise.
  * modules/spawn-pipe (Depends-on): Likewise.
  * modules/flock (Depends-on): Likewise.
  * modules/fsync (Depends-on): Likewise.
  * modules/isapipe (Depends-on): Likewise.
  * tests/test-cloexec.c: Include msvc-nothrow.h.
  * tests/test-dup-safer.c: Likewise.
  * tests/test-dup2.c: Likewise.
  * tests/test-dup3.c: Likewise.
  * tests/test-fcntl.c: Likewise.
  * tests/test-pipe.c: Likewise.
  * tests/test-pipe2.c: Likewise.
  * modules/cloexec-tests (Depends-on): Add msvc-nothrow.
  * modules/unistd-safer-tests (Depends-on): Likewise.
  * modules/dup2-tests (Depends-on): Likewise.
  * modules/dup3-tests (Depends-on): Likewise.
  * modules/fcntl-tests (Depends-on): Likewise.
  * modules/pipe-posix-tests (Depends-on): Likewise.
  * modules/pipe2-tests (Depends-on): Likewise.
  

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• lib/lseek.c

• /* An lseek() function that detects pipes.
     Copyright (C) 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 2, 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, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  /* Windows platforms.  */
  /* Get GetFileType.  */
  # include <windows.h>
  /* Get _get_osfhandle.  */
  # include "msvc-nothrow.h"
  #else
  # include <sys/stat.h>
  #endif
  #include <errno.h>
  
  #undef lseek
  
  off_t
  rpl_lseek (int fd, off_t offset, int whence)
  {
  #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
    /* mingw lseek mistakenly succeeds on pipes, sockets, and terminals.  */
    HANDLE h = (HANDLE) _get_osfhandle (fd);
    if (h == INVALID_HANDLE_VALUE)
      {
        errno = EBADF;
        return -1;
      }
    if (GetFileType (h) != FILE_TYPE_DISK)
      {
        errno = ESPIPE;
        return -1;
      }
  #else
    /* BeOS lseek mistakenly succeeds on pipes...  */
    struct stat statbuf;
    if (fstat (fd, &statbuf) < 0)
      return -1;
    if (!S_ISREG (statbuf.st_mode))
      {
        errno = ESPIPE;
        return -1;
      }
  #endif
    return lseek (fd, offset, whence);
  }
  

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