lib/libc_r/uthread/uthread_closefrom.c

   1 /*
   2  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Joerg Sonnenberger <joerg@bec.de>.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/lib/libc_r/uthread/uthread_closefrom.c,v 1.2 2005/05/02 20:40:50 joerg Exp $
  35  */
  36
  37 #include <errno.h>
  38 #include <pthread.h>
  39 #include <unistd.h>
  40 #include "pthread_private.h"
  41
  42 int
  43 _closefrom(int fd)
  44 {
  45         int i, error, my_errno;
  46
  47         my_errno = errno;
  48
  49         for (i = fd; i < _thread_dtablesize; i++)
  50                 _close(i);
  51
  52         errno = my_errno;
  53
  54         /* Check if we have to do anything. */
  55         if (_thread_kern_pipe[0] < fd && _thread_kern_pipe[1] < fd)
  56                 return(_closefrom(fd));
  57
  58         /* Defer signals, we want to close the pipe. */
  59         _thread_kern_sig_defer();
  60
  61         __sys_close(_thread_kern_pipe[0]);
  62         __sys_close(_thread_kern_pipe[1]);
  63         error = __sys_closefrom(fd);
  64
  65         _thread_mksigpipe();
  66
  67         /* Pipe is working again, handle signals. */
  68         _thread_kern_sig_undefer();
  69
  70         return(error);
  71 }
  72
  73 __strong_reference(_closefrom, closefrom);