libmount/src/init.c

   1 /*
   2  * Copyright (C) 2008 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 "mountP.h"
  17
  18 UL_DEBUG_DEFINE_MASK(libmount);
  19 UL_DEBUG_DEFINE_MASKNAMES(libmount) =
  20 {
  21         { "all", MNT_DEBUG_ALL,         "info about all subsystems" },
  22         { "cache", MNT_DEBUG_CACHE,     "paths and tags cache" },
  23         { "cxt", MNT_DEBUG_CXT,         "library context (handler)" },
  24         { "diff", MNT_DEBUG_DIFF,       "mountinfo changes tracking" },
  25         { "fs", MNT_DEBUG_FS,           "FS abstraction" },
  26         { "help", MNT_DEBUG_HELP,       "this help" },
  27         { "locks", MNT_DEBUG_LOCKS,     "mtab and utab locking" },
  28         { "loop", MNT_DEBUG_LOOP,       "loop devices routines" },
  29         { "options", MNT_DEBUG_OPTIONS, "mount options parsing" },
  30         { "tab", MNT_DEBUG_TAB,         "fstab, mtab, mountinfo routines" },
  31         { "update", MNT_DEBUG_UPDATE,   "mtab, utab updates" },
  32         { "utils", MNT_DEBUG_UTILS,     "misc library utils" },
  33         { "monitor", MNT_DEBUG_MONITOR, "mount tables monitor" },
  34         { "btrfs", MNT_DEBUG_BTRFS,     "btrfs specific routines" },
  35
  36         { NULL, 0 }
  37 };
  38
  39 /**
  40  * mnt_init_debug:
  41  * @mask: debug mask (0xffff to enable full debugging)
  42  *
  43  * If the @mask is not specified, then this function reads
  44  * the LIBMOUNT_DEBUG environment variable to get the mask.
  45  *
  46  * Already initialized debugging stuff cannot be changed. Calling
  47  * this function twice has no effect.
  48  */
  49 void mnt_init_debug(int mask)
  50 {
  51         if (libmount_debug_mask)
  52                 return;
  53
  54         __UL_INIT_DEBUG(libmount, MNT_DEBUG_, mask, LIBMOUNT_DEBUG);
  55
  56         if (libmount_debug_mask != MNT_DEBUG_INIT
  57             && libmount_debug_mask != (MNT_DEBUG_HELP|MNT_DEBUG_INIT)) {
  58                 const char *ver = NULL;
  59                 const char **features = NULL, **p;
  60
  61                 mnt_get_library_version(&ver);
  62                 mnt_get_library_features(&features);
  63
  64                 DBG(INIT, ul_debug("library debug mask: 0x%04x", libmount_debug_mask));
  65                 DBG(INIT, ul_debug("library version: %s", ver));
  66                 p = features;
  67                 while (p && *p)
  68                         DBG(INIT, ul_debug("    feature: %s", *p++));
  69         }
  70
  71         ON_DBG(HELP, ul_debug_print_masks("LIBMOUNT_DEBUG",
  72                                 UL_DEBUG_MASKNAMES(libmount)));
  73 }
  74
  75 #ifdef TEST_PROGRAM
  76
  77 #include <errno.h>
  78 #include <stdlib.h>
  79 int main(int argc, char *argv[])
  80 {
  81         if (argc == 2) {
  82                 int mask;
  83
  84                 errno = 0;
  85                 mask = strtoul(argv[1], 0, 0);
  86
  87                 if (errno)
  88                         return 1;
  89
  90                 mnt_init_debug(mask);
  91         }
  92         else if (argc == 1) {
  93                 mnt_init_debug(0);
  94         } else
  95                 return 1;
  96
  97         return 0;
  98 }
  99 #endif /* TEST_PROGRAM */
 100