kc3-lang/gnulib/lib/fcntl.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/fcntl.c

• /* Provide file descriptor control.
  
     Copyright (C) 2009-2018 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 <https://www.gnu.org/licenses/>.  */
  
  /* Written by Eric Blake <ebb9@byu.net>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <fcntl.h>
  
  #include <errno.h>
  #include <limits.h>
  #include <stdarg.h>
  #include <unistd.h>
  
  #if !HAVE_FCNTL
  # define rpl_fcntl fcntl
  #endif
  #undef fcntl
  
  #if defined _WIN32 && ! defined __CYGWIN__
  /* Get declarations of the native Windows API functions.  */
  # define WIN32_LEAN_AND_MEAN
  # include <windows.h>
  
  /* Get _get_osfhandle.  */
  # if GNULIB_MSVC_NOTHROW
  #  include "msvc-nothrow.h"
  # else
  #  include <io.h>
  # endif
  
  /* Upper bound on getdtablesize().  See lib/getdtablesize.c.  */
  # define OPEN_MAX_MAX 0x10000
  
  /* Duplicate OLDFD into the first available slot of at least NEWFD,
     which must be positive, with FLAGS determining whether the duplicate
     will be inheritable.  */
  static int
  dupfd (int oldfd, int newfd, int flags)
  {
    /* Mingw has no way to create an arbitrary fd.  Iterate until all
       file descriptors less than newfd are filled up.  */
    HANDLE curr_process = GetCurrentProcess ();
    HANDLE old_handle = (HANDLE) _get_osfhandle (oldfd);
    unsigned char fds_to_close[OPEN_MAX_MAX / CHAR_BIT];
    unsigned int fds_to_close_bound = 0;
    int result;
    BOOL inherit = flags & O_CLOEXEC ? FALSE : TRUE;
    int mode;
  
    if (newfd < 0 || getdtablesize () <= newfd)
      {
        errno = EINVAL;
        return -1;
      }
    if (old_handle == INVALID_HANDLE_VALUE
        || (mode = setmode (oldfd, O_BINARY)) == -1)
      {
        /* oldfd is not open, or is an unassigned standard file
           descriptor.  */
        errno = EBADF;
        return -1;
      }
    setmode (oldfd, mode);
    flags |= mode;
  
    for (;;)
      {
        HANDLE new_handle;
        int duplicated_fd;
        unsigned int index;
  
        if (!DuplicateHandle (curr_process,           /* SourceProcessHandle */
                              old_handle,             /* SourceHandle */
                              curr_process,           /* TargetProcessHandle */
                              (PHANDLE) &new_handle,  /* TargetHandle */
                              (DWORD) 0,              /* DesiredAccess */
                              inherit,                /* InheritHandle */
                              DUPLICATE_SAME_ACCESS)) /* Options */
          {
            switch (GetLastError ())
              {
                case ERROR_TOO_MANY_OPEN_FILES:
                  errno = EMFILE;
                  break;
                case ERROR_INVALID_HANDLE:
                case ERROR_INVALID_TARGET_HANDLE:
                case ERROR_DIRECT_ACCESS_HANDLE:
                  errno = EBADF;
                  break;
                case ERROR_INVALID_PARAMETER:
                case ERROR_INVALID_FUNCTION:
                case ERROR_INVALID_ACCESS:
                  errno = EINVAL;
                  break;
                default:
                  errno = EACCES;
                  break;
              }
            result = -1;
            break;
          }
        duplicated_fd = _open_osfhandle ((intptr_t) new_handle, flags);
        if (duplicated_fd < 0)
          {
            CloseHandle (new_handle);
            result = -1;
            break;
          }
        if (newfd <= duplicated_fd)
          {
            result = duplicated_fd;
            break;
          }
  
        /* Set the bit duplicated_fd in fds_to_close[].  */
        index = (unsigned int) duplicated_fd / CHAR_BIT;
        if (fds_to_close_bound <= index)
          {
            if (sizeof fds_to_close <= index)
              /* Need to increase OPEN_MAX_MAX.  */
              abort ();
            memset (fds_to_close + fds_to_close_bound, '\0',
                    index + 1 - fds_to_close_bound);
            fds_to_close_bound = index + 1;
          }
        fds_to_close[index] |= 1 << ((unsigned int) duplicated_fd % CHAR_BIT);
      }
  
    /* Close the previous fds that turned out to be too small.  */
    {
      int saved_errno = errno;
      unsigned int duplicated_fd;
  
      for (duplicated_fd = 0;
           duplicated_fd < fds_to_close_bound * CHAR_BIT;
           duplicated_fd++)
        if ((fds_to_close[duplicated_fd / CHAR_BIT]
             >> (duplicated_fd % CHAR_BIT))
            & 1)
          close (duplicated_fd);
  
      errno = saved_errno;
    }
  
  # if REPLACE_FCHDIR
    if (0 <= result)
      result = _gl_register_dup (oldfd, result);
  # endif
    return result;
  }
  #endif /* W32 */
  
  #ifdef __KLIBC__
  
  # define INCL_DOS
  # include <os2.h>
  
  static int
  klibc_fcntl (int fd, int action, /* arg */...)
  {
    va_list arg_ptr;
    int arg;
    struct stat sbuf;
    int result = -1;
  
    va_start (arg_ptr, action);
    arg = va_arg (arg_ptr, int);
    result = fcntl (fd, action, arg);
    /* EPERM for F_DUPFD, ENOTSUP for others */
    if (result == -1 && (errno == EPERM || errno == ENOTSUP)
        && !fstat (fd, &sbuf) && S_ISDIR (sbuf.st_mode))
    {
      ULONG ulMode;
  
      switch (action)
        {
        case F_DUPFD:
          /* Find available fd */
          while (fcntl (arg, F_GETFL) != -1 || errno != EBADF)
            arg++;
  
          result = dup2 (fd, arg);
          break;
  
        /* Using underlying APIs is right ? */
        case F_GETFD:
          if (DosQueryFHState (fd, &ulMode))
            break;
  
          result = (ulMode & OPEN_FLAGS_NOINHERIT) ? FD_CLOEXEC : 0;
          break;
  
        case F_SETFD:
          if (arg & ~FD_CLOEXEC)
            break;
  
          if (DosQueryFHState (fd, &ulMode))
            break;
  
          if (arg & FD_CLOEXEC)
            ulMode |= OPEN_FLAGS_NOINHERIT;
          else
            ulMode &= ~OPEN_FLAGS_NOINHERIT;
  
          /* Filter supported flags.  */
          ulMode &= (OPEN_FLAGS_WRITE_THROUGH | OPEN_FLAGS_FAIL_ON_ERROR
                     | OPEN_FLAGS_NO_CACHE | OPEN_FLAGS_NOINHERIT);
  
          if (DosSetFHState (fd, ulMode))
            break;
  
          result = 0;
          break;
  
        case F_GETFL:
          result = 0;
          break;
  
        case F_SETFL:
          if (arg != 0)
            break;
  
          result = 0;
          break;
  
        default :
          errno = EINVAL;
          break;
        }
    }
  
    va_end (arg_ptr);
  
    return result;
  }
  
  # define fcntl klibc_fcntl
  #endif
  
  /* Perform the specified ACTION on the file descriptor FD, possibly
     using the argument ARG further described below.  This replacement
     handles the following actions, and forwards all others on to the
     native fcntl.  An unrecognized ACTION returns -1 with errno set to
     EINVAL.
  
     F_DUPFD - duplicate FD, with int ARG being the minimum target fd.
     If successful, return the duplicate, which will be inheritable;
     otherwise return -1 and set errno.
  
     F_DUPFD_CLOEXEC - duplicate FD, with int ARG being the minimum
     target fd.  If successful, return the duplicate, which will not be
     inheritable; otherwise return -1 and set errno.
  
     F_GETFD - ARG need not be present.  If successful, return a
     non-negative value containing the descriptor flags of FD (only
     FD_CLOEXEC is portable, but other flags may be present); otherwise
     return -1 and set errno.  */
  
  int
  rpl_fcntl (int fd, int action, /* arg */...)
  {
    va_list arg;
    int result = -1;
    va_start (arg, action);
    switch (action)
      {
  
  #if !HAVE_FCNTL
      case F_DUPFD:
        {
          int target = va_arg (arg, int);
          result = dupfd (fd, target, 0);
          break;
        }
  #elif FCNTL_DUPFD_BUGGY || REPLACE_FCHDIR
      case F_DUPFD:
        {
          int target = va_arg (arg, int);
          /* Detect invalid target; needed for cygwin 1.5.x.  */
          if (target < 0 || getdtablesize () <= target)
            errno = EINVAL;
          else
            {
              /* Haiku alpha 2 loses fd flags on original.  */
              int flags = fcntl (fd, F_GETFD);
              if (flags < 0)
                {
                  result = -1;
                  break;
                }
              result = fcntl (fd, action, target);
              if (0 <= result && fcntl (fd, F_SETFD, flags) == -1)
                {
                  int saved_errno = errno;
                  close (result);
                  result = -1;
                  errno = saved_errno;
                }
  # if REPLACE_FCHDIR
              if (0 <= result)
                result = _gl_register_dup (fd, result);
  # endif
            }
          break;
        } /* F_DUPFD */
  #endif /* FCNTL_DUPFD_BUGGY || REPLACE_FCHDIR */
  
      case F_DUPFD_CLOEXEC:
        {
          int target = va_arg (arg, int);
  
  #if !HAVE_FCNTL
          result = dupfd (fd, target, O_CLOEXEC);
          break;
  #else /* HAVE_FCNTL */
          /* Try the system call first, if the headers claim it exists
             (that is, if GNULIB_defined_F_DUPFD_CLOEXEC is 0), since we
             may be running with a glibc that has the macro but with an
             older kernel that does not support it.  Cache the
             information on whether the system call really works, but
             avoid caching failure if the corresponding F_DUPFD fails
             for any reason.  0 = unknown, 1 = yes, -1 = no.  */
          static int have_dupfd_cloexec = GNULIB_defined_F_DUPFD_CLOEXEC ? -1 : 0;
          if (0 <= have_dupfd_cloexec)
            {
              result = fcntl (fd, action, target);
              if (0 <= result || errno != EINVAL)
                {
                  have_dupfd_cloexec = 1;
  # if REPLACE_FCHDIR
                  if (0 <= result)
                    result = _gl_register_dup (fd, result);
  # endif
                }
              else
                {
                  result = rpl_fcntl (fd, F_DUPFD, target);
                  if (result < 0)
                    break;
                  have_dupfd_cloexec = -1;
                }
            }
          else
            result = rpl_fcntl (fd, F_DUPFD, target);
          if (0 <= result && have_dupfd_cloexec == -1)
            {
              int flags = fcntl (result, F_GETFD);
              if (flags < 0 || fcntl (result, F_SETFD, flags | FD_CLOEXEC) == -1)
                {
                  int saved_errno = errno;
                  close (result);
                  errno = saved_errno;
                  result = -1;
                }
            }
          break;
  #endif /* HAVE_FCNTL */
        } /* F_DUPFD_CLOEXEC */
  
  #if !HAVE_FCNTL
      case F_GETFD:
        {
  # if defined _WIN32 && ! defined __CYGWIN__
          HANDLE handle = (HANDLE) _get_osfhandle (fd);
          DWORD flags;
          if (handle == INVALID_HANDLE_VALUE
              || GetHandleInformation (handle, &flags) == 0)
            errno = EBADF;
          else
            result = (flags & HANDLE_FLAG_INHERIT) ? 0 : FD_CLOEXEC;
  # else /* !W32 */
          /* Use dup2 to reject invalid file descriptors.  No way to
             access this information, so punt.  */
          if (0 <= dup2 (fd, fd))
            result = 0;
  # endif /* !W32 */
          break;
        } /* F_GETFD */
  #endif /* !HAVE_FCNTL */
  
        /* Implementing F_SETFD on mingw is not trivial - there is no
           API for changing the O_NOINHERIT bit on an fd, and merely
           changing the HANDLE_FLAG_INHERIT bit on the underlying handle
           can lead to odd state.  It may be possible by duplicating the
           handle, using _open_osfhandle with the right flags, then
           using dup2 to move the duplicate onto the original, but that
           is not supported for now.  */
  
      default:
        {
  #if HAVE_FCNTL
          void *p = va_arg (arg, void *);
          result = fcntl (fd, action, p);
  #else
          errno = EINVAL;
  #endif
          break;
        }
      }
    va_end (arg);
    return result;
  }
  

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