1  /*
       2   * Copyright (C) 2008-2013 Karel Zak <kzak@redhat.com>
       3   *
       4   * This file may be redistributed under the terms of the
       5   * GNU Lesser General Public License.
       6   */
       7  
       8  /**
       9   * SECTION: init
      10   * @title: Library initialization
      11   * @short_description: initialize debugging
      12   */
      13  
      14  #include <stdarg.h>
      15  
      16  #include "blkidP.h"
      17  
      18  UL_DEBUG_DEFINE_MASK(libblkid);
      19  UL_DEBUG_DEFINE_MASKNAMES(libblkid) =
      20  {
      21  	{ "all", BLKID_DEBUG_ALL,	"info about all subsystems" },
      22  	{ "cache", BLKID_DEBUG_CACHE,	"blkid tags cache" },
      23  	{ "config", BLKID_DEBUG_CONFIG, "config file utils" },
      24  	{ "dev", BLKID_DEBUG_DEV,       "device utils" },
      25  	{ "devname", BLKID_DEBUG_DEVNAME, "/proc/partitions evaluation" },
      26  	{ "devno", BLKID_DEBUG_DEVNO,	"conversions to device name" },
      27  	{ "evaluate", BLKID_DEBUG_EVALUATE, "tags resolving" },
      28  	{ "help", BLKID_DEBUG_HELP,	"this help" },
      29  	{ "lowprobe", BLKID_DEBUG_LOWPROBE, "superblock/raids/partitions probing" },
      30  	{ "buffer", BLKID_DEBUG_BUFFER, "low-probing buffers" },
      31  	{ "probe", BLKID_DEBUG_PROBE,	"devices verification" },
      32  	{ "read", BLKID_DEBUG_READ,	"cache parsing" },
      33  	{ "save", BLKID_DEBUG_SAVE,	"cache writing" },
      34  	{ "tag", BLKID_DEBUG_TAG,	"tags utils" },
      35  	{ NULL, 0, NULL }
      36  };
      37  
      38  /**
      39   * blkid_init_debug:
      40   * @mask: debug mask (0xffff to enable full debugging)
      41   *
      42   * If the @mask is not specified then this function reads
      43   * LIBBLKID_DEBUG environment variable to get the mask.
      44   *
      45   * Already initialized debugging stuff cannot be changed. It does not
      46   * have effect to call this function twice.
      47   */
      48  void blkid_init_debug(int mask)
      49  {
      50  	if (libblkid_debug_mask)
      51  		return;
      52  
      53  	__UL_INIT_DEBUG_FROM_ENV(libblkid, BLKID_DEBUG_, mask, LIBBLKID_DEBUG);
      54  
      55  	if (libblkid_debug_mask != BLKID_DEBUG_INIT
      56  	    && libblkid_debug_mask != (BLKID_DEBUG_HELP|BLKID_DEBUG_INIT)) {
      57  		const char *ver = NULL;
      58  		const char *date = NULL;
      59  
      60  		blkid_get_library_version(&ver, &date);
      61  		DBG(INIT, ul_debug("library debug mask: 0x%04x", libblkid_debug_mask));
      62  		DBG(INIT, ul_debug("library version: %s [%s]", ver, date));
      63  
      64  	}
      65  	ON_DBG(HELP, ul_debug_print_masks("LIBBLKID_DEBUG",
      66  				UL_DEBUG_MASKNAMES(libblkid)));
      67  }
      68  
      69  static void __attribute__ ((constructor)) blkid_init_default_debug(void)
      70  {
      71  	blkid_init_debug(0);
      72  }