sysdeps/mach/hurd/close_range.c

   1 /* Copyright (C) 2021-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <hurd.h>
  20 #include <hurd/fd.h>
  21
  22 /* Close the file descriptors from FIRST up to LAST, inclusive.
  23    If CLOSE_RANGE_CLOEXEC is set in FLAGS, set the FD_CLOEXEC flag
  24    instead of closing.  */
  25 int
  26 __close_range (unsigned int first, unsigned int last,
  27                int flags)
  28 {
  29   int i;
  30
  31   if (first > last)
  32     return __hurd_fail (EINVAL);
  33   if (flags & ~CLOSE_RANGE_CLOEXEC)
  34     return __hurd_fail (EINVAL);
  35
  36   HURD_CRITICAL_BEGIN;
  37   __mutex_lock (&_hurd_dtable_lock);
  38
  39   for (i = first; i <= last && i < _hurd_dtablesize; i++)
  40     {
  41       struct hurd_fd *fd = _hurd_dtable[i];
  42
  43       if (fd == NULL || fd->port.port == MACH_PORT_NULL)
  44         continue;
  45
  46       __spin_lock (&fd->port.lock);
  47
  48       if (flags & CLOSE_RANGE_CLOEXEC)
  49         fd->flags |= FD_CLOEXEC;
  50       else
  51         {
  52           _hurd_port_set (&fd->ctty, MACH_PORT_NULL);
  53           _hurd_port_locked_set (&fd->port, MACH_PORT_NULL);
  54         }
  55
  56       __spin_unlock (&fd->port.lock);
  57     }
  58
  59   __mutex_unlock (&_hurd_dtable_lock);
  60   HURD_CRITICAL_END;
  61
  62   return 0;
  63 }
  64
  65 libc_hidden_def (__close_range)
  66 weak_alias (__close_range, close_range)