kc3-lang/gnulib/lib/dup2.c

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• Hash : 7c3f8da8
  Author :
  Date : 2005-09-23T04:15:13
  

  Sync from coreutils.
  
  * .cppi-disable: Add regcomp.c, regex_internal.c, regex_internal.h,
  stat-time.h.
  * argmatch.h: Include verify.h
  (ARGMATCH_VERIFY): Use verify rather than rolling our own.
  (ARGMATCH_ASSERT): Remove; unused.
  * canonicalize.c: Assume STDC_HEADERS.
  * exclude.c: Include "strcase.h".
  * regex_internal.h [!defined _LIBC]: Likewise.
  * getusershell.c: Include stdio--.h rather than stdio.h
  and stdio-safer.h.
  (getusershell): Call fopen, not fopen_safer.
  * save-cwd.c: Include fcntl--.h rather than fcntl.h.
  Do not include unistd-safer.h.
  (save_cwd): Don't call fd_safer; no longer needed
  now that we include fcntl--.h.
  
  * modules/argmatch (Depends-on): Add verify.
  * modules/getloadavg (Depends-on): Depend on fcntl-safer, not
  unistd-safer.
  * modules/save-cwd (Depends-on): Likewise.
  
  * backupfile.m4, calloc.m4, chown.m4, cloexec.m4, dup2.m4:
  * fileblocks.m4, free.m4, ftruncate.m4, getcwd.m4, getpagesize.m4:
  * getugroups.m4, group-member.m4, idcache.m4, link-follow.m4:
  * mkstemp.m4, mktime.m4, mountlist.m4, nanosleep.m4, pathmax.m4:
  * physmem.m4, posixver.m4, putenv.m4, safe-read.m4, same.m4:
  * save-cwd.m4, stdio-safer.m4, unistd-safer.m4, unlinkdir.m4:
  * userspec.m4, xgetcwd.m4, xreadlink.m4:
  Don't bother checking for string.h, stdlib.h, unistd.h.
  * fts.m4 (gl_FUNC_FTS_CORE): Don't require
  AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK; that's now the lstat
  module's job.
  * jm-macros.m4 (gl_MACROS): Likewise.
  * prereq.m4 (gl_PREREQ): Add gl_FUNC_LSTAT.
  
  * backupfile.c: Use ARGMATCH_VERIFY, just in case.
  * posixtm.c (posixtime) [lint]: Initialize *all* of tm0, not just
  the .tm_year member, since otherwise gcc-4.0 would now warn about
  tm_zone, tm_gmtoff, tm_isdst, tm_yday, tm_wday.
  * quotearg.c (quotearg_n_options): Change code to be suboptimal, in
  order to avoid an unsuppressible warning from gcc on 64-bit systems.
  
  * lstat.m4 (gl_FUNC_LSTAT):
  Use AC_LIBSOURCES to require lstat.c and lstat.h.
  Remove obsolete comment.
  * xreadlink.m4: Use AC_LIBSOURCES and AC_LIBOBJ.
  * xstrtod.m4: Likewise.
  

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• lib/dup2.c

• /* Duplicate an open file descriptor to a specified file descriptor.
     Copyright (C) 1999, 2004, 2005 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.  */
  
  /* written by Paul Eggert */
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  #include <errno.h>
  #include <fcntl.h>
  #include <unistd.h>
  
  #ifndef F_DUPFD
  static int
  dupfd (int fd, int desired_fd)
  {
    int duplicated_fd = dup (fd);
    if (duplicated_fd < 0 || duplicated_fd == desired_fd)
      return duplicated_fd;
    else
      {
        int r = dupfd (fd, desired_fd);
        int e = errno;
        close (duplicated_fd);
        errno = e;
        return r;
      }
  }
  #endif
  
  int
  dup2 (int fd, int desired_fd)
  {
    if (fd == desired_fd)
      return fd;
    close (desired_fd);
  #ifdef F_DUPFD
    return fcntl (fd, F_DUPFD, desired_fd);
  #else
    return dupfd (fd, desired_fd);
  #endif
  }
  

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