kc3-lang/gnulib/lib/getdtablesize.c

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• Hash : 44b65c48
  Author :
  Date : 2018-05-03T23:09:42
  

  Simplify code. Drop support for Borland C++ on Windows.
  
  Reported by Gisle Vanem <gisle.vanem@gmail.com>.
  
  * lib/accept4.c: Simplify 'defined _WIN32 || defined __WIN32__' to just
  'defined _WIN32'.
  * lib/canonicalize-lgpl.c: Likewise.
  * lib/classpath.c: Likewise.
  * lib/clean-temp.c: Likewise.
  * lib/csharpexec.c: Likewise.
  * lib/ctime.c: Likewise.
  * lib/dosname.h: Likewise.
  * lib/dup2.c: Likewise.
  * lib/errno.in.h: Likewise.
  * lib/error.c: Likewise.
  * lib/euidaccess.c: Likewise.
  * lib/execute.c: Likewise.
  * lib/fcntl.in.h: Likewise.
  * lib/fcntl.c: Likewise.
  * lib/filename.h: Likewise.
  * lib/findprog.c: Likewise.
  * lib/flock.c: Likewise.
  * lib/fopen.c: Likewise.
  * lib/freopen.c: Likewise.
  * lib/fstat.c: Likewise.
  * lib/fsync.c: Likewise.
  * lib/gc-gnulib.c: Likewise.
  * lib/get-rusage-data.c: Likewise.
  * lib/getaddrinfo.c: Likewise.
  * lib/getdelim.c: Likewise.
  * lib/getdtablesize.c: Likewise.
  * lib/gethostname.c: Likewise.
  * lib/getlogin.c: Likewise.
  * lib/getlogin_r.c: Likewise.
  * lib/getopt.c: Likewise.
  * lib/getpagesize.c: Likewise.
  * lib/getpass.c: Likewise.
  * lib/getrusage.c: Likewise.
  * lib/gettimeofday.c: Likewise.
  * lib/glob.c: Likewise.
  * lib/inttypes.in.h: Likewise.
  * lib/isapipe.c: Likewise.
  * lib/javaexec.c: Likewise.
  * lib/link.c: Likewise.
  * lib/localcharset.c: Likewise.
  * lib/localename.h: Likewise.
  * lib/localename.c: Likewise.
  * lib/localtime.c: Likewise.
  * lib/lseek.c: Likewise.
  * lib/mbsinit.c: Likewise.
  * lib/mkdir.c: Likewise.
  * lib/msvc-nothrow.h: Likewise.
  * lib/nanosleep.c: Likewise.
  * lib/nl_langinfo.c: Likewise.
  * lib/nonblocking.c: Likewise.
  * lib/nproc.c: Likewise.
  * lib/open.c: Likewise.
  * lib/openpty.c: Likewise.
  * lib/pathmax.h: Likewise.
  * lib/pipe-filter-aux.c: Likewise.
  * lib/pipe-filter-gi.c: Likewise.
  * lib/pipe-filter-ii.c: Likewise.
  * lib/pipe.c: Likewise.
  * lib/pipe2.c: Likewise.
  * lib/poll.c: Likewise.
  * lib/popen.c: Likewise.
  * lib/posix_openpt.c: Likewise.
  * lib/printf-parse.c: Likewise.
  * lib/progreloc.c: Likewise.
  * lib/putenv.c: Likewise.
  * lib/read.c: Likewise.
  * lib/relocatable.c: Likewise.
  * lib/rename.c: Likewise.
  * lib/same-inode.h: Likewise.
  * lib/secure_getenv.c: Likewise.
  * lib/select.c: Likewise.
  * lib/sethostname.c: Likewise.
  * lib/setlocale.c: Likewise.
  * lib/sigaction.c: Likewise.
  * lib/sigprocmask.c: Likewise.
  * lib/sleep.c: Likewise.
  * lib/spawn-pipe.h: Likewise.
  * lib/spawn-pipe.c: Likewise.
  * lib/spawni.c: Likewise.
  * lib/stat-time.h: Likewise.
  * lib/stat-w32.c: Likewise.
  * lib/stat.c: Likewise.
  * lib/stdio.in.h: Likewise.
  * lib/stdio-impl.h: Likewise.
  * lib/stdio-read.c: Likewise.
  * lib/stdio-write.c: Likewise.
  * lib/stdlib.in.h: Likewise.
  * lib/strerror_r.c: Likewise.
  * lib/strftime-fixes.c: Likewise.
  * lib/sys_stat.in.h: Likewise.
  * lib/sys_types.in.h: Likewise.
  * lib/sys_wait.in.h : Likewise.
  * lib/system-quote.h: Likewise.
  * lib/system-quote.c: Likewise.
  * lib/tmpdir.c: Likewise.
  * lib/tzset.c: Likewise.
  * lib/uname.c: Likewise.
  * lib/unistd.in.h: Likewise.
  * lib/utime.in.h: Likewise.
  * lib/utime.c: Likewise.
  * lib/utimecmp.c: Likewise.
  * lib/utimens.c: Likewise.
  * lib/vasnprintf.c: Likewise.
  * lib/vma-iter.h: Likewise.
  * lib/vma-iter.c: Likewise.
  * lib/wait-process.c: Likewise.
  * lib/wcsftime.c: Likewise.
  * lib/wctype.in.h: Likewise.
  * lib/write.c: Likewise.
  * tests/nap.h: Likewise.
  * tests/test-cloexec.c: Likewise.
  * tests/test-dup-safer.c: Likewise.
  * tests/test-dup2.c: Likewise.
  * tests/test-dup3.c: Likewise.
  * tests/test-fcntl.c: Likewise.
  * tests/test-get-rusage-data.c: Likewise.
  * tests/test-getaddrinfo.c: Likewise.
  * tests/test-getlogin.h: Likewise.
  * tests/test-isatty.c: Likewise.
  * tests/test-localename.c: Likewise.
  * tests/test-mbrtowc-w32.c: Likewise.
  * tests/test-nonblocking.c: Likewise.
  * tests/test-nonblocking-pipe-main.c: Likewise.
  * tests/test-nonblocking-socket-main.c: Likewise.
  * tests/test-nonblocking-socket.h: Likewise.
  * tests/test-pipe.c: Likewise.
  * tests/test-pipe2.c: Likewise.
  * tests/test-poll.c: Likewise.
  * tests/test-pthread_sigmask1.c: Likewise.
  * tests/test-select.h: Likewise.
  * tests/test-sethostname2.c: Likewise.
  * tests/test-sigprocmask.c: Likewise.
  * tests/test-spawn-pipe-child.c: Likewise.
  * tests/test-stat-time.c: Likewise.
  * tests/test-system-quote-main.c: Likewise.
  * tests/test-utimens-common.h: Likewise.
  * tests/test-wcrtomb-w32.c: Likewise.
  * m4/csharpexec.m4 (gt_CSHARPEXEC): Likewise.
  * m4/getcwd.m4 (gl_FUNC_GETCWD_NULL): Likewise.
  * m4/javacomp.m4 (gt_JAVACOMP): Likewise.
  * m4/javaexec.m4 (gt_JAVAEXEC): Likewise.
  * m4/locale-ar.m4 (gt_LOCALE_AR): Likewise.
  * m4/locale-fr.m4 (gt_LOCALE_FR, gt_LOCALE_FR_UTF8): Likewise.
  * m4/locale-ja.m4 (gt_LOCALE_JA): Likewise.
  * m4/locale-tr.m4 (gt_LOCALE_TR_UTF8): Likewise.
  * m4/locale-zh.m4 (gt_LOCALE_ZH_CN): Likewise.
  * m4/malloc.m4 (gl_CHECK_MALLOC_POSIX): Likewise.
  * m4/nocrash.m4 (GL_NOCRASH): Likewise.
  * m4/pathmax.m4 (gl_PATHMAX_SNIPPET): Likewise.
  * m4/ptsname_r.m4 (gl_PREREQ_PTSNAME_R): Likewise.
  * m4/stdio_h.m4 (gl_STDIO_H): Likewise.
  * m4/tmpfile.m4 (gl_FUNC_TMPFILE): Likewise.
  * m4/unistd_h.m4 (gl_UNISTD_H): Likewise.
  

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• lib/getdtablesize.c

• /* getdtablesize() function: Return maximum possible file descriptor value + 1.
     Copyright (C) 2008-2018 Free Software Foundation, Inc.
     Written by Bruno Haible <bruno@clisp.org>, 2008.
  
     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 <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  #if defined _WIN32 && ! defined __CYGWIN__
  
  # include <stdio.h>
  
  # if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  #  include "msvc-inval.h"
  # endif
  
  # if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  static int
  _setmaxstdio_nothrow (int newmax)
  {
    int result;
  
    TRY_MSVC_INVAL
      {
        result = _setmaxstdio (newmax);
      }
    CATCH_MSVC_INVAL
      {
        result = -1;
      }
    DONE_MSVC_INVAL;
  
    return result;
  }
  # else
  #  define _setmaxstdio_nothrow _setmaxstdio
  # endif
  
  /* Cache for the previous getdtablesize () result.  Safe to cache because
     Windows also lacks setrlimit.  */
  static int dtablesize;
  
  int
  getdtablesize (void)
  {
    if (dtablesize == 0)
      {
        /* We are looking for the number N such that the valid file descriptors
           are 0..N-1.  It can be obtained through a loop as follows:
             {
               int fd;
               for (fd = 3; fd < 65536; fd++)
                 if (dup2 (0, fd) == -1)
                   break;
               return fd;
             }
           On Windows XP, the result is 2048.
           The drawback of this loop is that it allocates memory for a libc
           internal array that is never freed.
  
           The number N can also be obtained as the upper bound for
           _getmaxstdio ().  _getmaxstdio () returns the maximum number of open
           FILE objects.  The sanity check in _setmaxstdio reveals the maximum
           number of file descriptors.  This too allocates memory, but it is
           freed when we call _setmaxstdio with the original value.  */
        int orig_max_stdio = _getmaxstdio ();
        unsigned int bound;
        for (bound = 0x10000; _setmaxstdio_nothrow (bound) < 0; bound = bound / 2)
          ;
        _setmaxstdio_nothrow (orig_max_stdio);
        dtablesize = bound;
      }
    return dtablesize;
  }
  
  #else
  
  # include <limits.h>
  # include <sys/resource.h>
  
  # ifndef RLIM_SAVED_CUR
  #  define RLIM_SAVED_CUR RLIM_INFINITY
  # endif
  # ifndef RLIM_SAVED_MAX
  #  define RLIM_SAVED_MAX RLIM_INFINITY
  # endif
  
  # ifdef __CYGWIN__
    /* Cygwin 1.7.25 auto-increases the RLIMIT_NOFILE soft limit until it
       hits the compile-time constant hard limit of 3200.  We might as
       well just report the hard limit.  */
  #  define rlim_cur rlim_max
  # endif
  
  int
  getdtablesize (void)
  {
    struct rlimit lim;
  
    if (getrlimit (RLIMIT_NOFILE, &lim) == 0
        && 0 <= lim.rlim_cur && lim.rlim_cur <= INT_MAX
        && lim.rlim_cur != RLIM_INFINITY
        && lim.rlim_cur != RLIM_SAVED_CUR
        && lim.rlim_cur != RLIM_SAVED_MAX)
      return lim.rlim_cur;
  
    return INT_MAX;
  }
  
  #endif
  

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