IABSD.fr/xenocara/lib/libpciaccess/src/common_init.c

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• Author : matthieu
  Date : 2026-05-16 14:40:55
  Hash : 50816655
  Message : Update to libpciaccess 0.19

• lib/libpciaccess/src/common_init.c

• /*
   * (C) Copyright IBM Corporation 2006
   * All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * on the rights to use, copy, modify, merge, publish, distribute, sub
   * license, and/or sell copies of the Software, and to permit persons to whom
   * the Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
   * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  /**
   * \file common_init.c
   * Platform independent routines for initializing access to the PCI system.
   *
   * \author Ian Romanick <idr@us.ibm.com>
   */
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <stdlib.h>
  #include <errno.h>
  
  #include "pciaccess.h"
  #include "pciaccess_private.h"
  
  _pci_hidden struct pci_system * pci_sys;
  static int pci_sys_refcnt = 0;
  
  /**
   * Initialize the PCI subsystem for access.
   *
   * \return
   * Zero on success or an errno value on failure.  In particular, if no
   * platform-specific initializers are available, \c ENOSYS will be returned.
   *
   * \sa pci_system_cleanup
   */
  
  int
  pci_system_init( void )
  {
      int err = ENOSYS;
  
      if ( pci_sys_refcnt > 0 ) {
            pci_sys_refcnt++;
            return 0;
      }
  
  #ifdef __linux__
      err = pci_system_linux_sysfs_create();
  #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
      err = pci_system_freebsd_create();
  #elif defined(__NetBSD__)
      err = pci_system_netbsd_create();
  #elif defined(__OpenBSD__)
      err = pci_system_openbsd_create();
  #elif defined(__sun)
      err = pci_system_solx_devfs_create();
  #elif defined(__GNU__)
      err = pci_system_hurd_create();
  #elif defined(__CYGWIN__)
      err = pci_system_x86_create();
  #else
  # error "Unsupported OS"
  #endif
  
      if ( pci_sys != NULL ) {
  	pci_sys_refcnt = 1;
      }
  
      return err;
  }
  
  void
  pci_system_init_dev_mem(int fd)
  {
  #if defined(__OpenBSD__)
      pci_system_openbsd_init_dev_mem(fd);
  #endif
  }
  
  /**
   * Shutdown all access to the PCI subsystem.
   *
   * \sa pci_system_init
   */
  void
  pci_system_cleanup( void )
  {
      unsigned i;
      unsigned j;
  
  
      if ( pci_sys == NULL ) {
  	return;
      }
  
      if ( pci_sys_refcnt > 1 ) {
  	pci_sys_refcnt--;
  	return;
      }
  
      pci_io_cleanup();
  
      if ( pci_sys->devices ) {
  	for ( i = 0 ; i < pci_sys->num_devices ; i++ ) {
  	    for ( j = 0 ; j < 6 ; j++ ) {
  		(void) pci_device_unmap_region( & pci_sys->devices[i].base, j );
  	    }
  
  	    free( (char *) pci_sys->devices[i].device_string );
  	    free( (char *) pci_sys->devices[i].agp );
  
  	    pci_sys->devices[i].device_string = NULL;
  	    pci_sys->devices[i].agp = NULL;
  
  	    if ( pci_sys->methods->destroy_device != NULL ) {
  		(*pci_sys->methods->destroy_device)( & pci_sys->devices[i].base );
  	    }
  	}
  
  	free( pci_sys->devices );
  	pci_sys->devices = NULL;
  	pci_sys->num_devices = 0;
      }
  
      if ( pci_sys->methods->destroy != NULL ) {
  	(*pci_sys->methods->destroy)();
      }
  
      free( pci_sys );
      pci_sys = NULL;
      pci_sys_refcnt = 0;
  }