src/common/compat/uuid.h

   1 /*
   2  * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to
   6  * deal in the Software without restriction, including without limitation the
   7  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   8  * sell copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  20  * IN THE SOFTWARE.
  21  */
  22
  23 #ifndef LTTNG_UUID_H
  24 #define LTTNG_UUID_H
  25
  26 #include <common/macros.h>
  27
  28 /*
  29  * Includes final \0.
  30  */
  31 #define UUID_STR_LEN            37
  32 #define UUID_LEN                16
  33
  34 #ifdef LTTNG_HAVE_LIBUUID
  35 #include <uuid/uuid.h>
  36
  37 /*
  38  * uuid_out is of len UUID_LEN.
  39  */
  40 static inline
  41 int lttng_uuid_generate(unsigned char *uuid_out)
  42 {
  43         uuid_generate(uuid_out);
  44         return 0;
  45 }
  46
  47 #elif defined(LTTNG_HAVE_LIBC_UUID)
  48 #include <uuid.h>
  49 #include <stdint.h>
  50
  51 /*
  52  * uuid_out is of len UUID_LEN.
  53  */
  54 static inline
  55 int lttng_uuid_generate(unsigned char *uuid_out)
  56 {
  57         uint32_t status;
  58
  59         uuid_create((uuid_t *) uuid_out, &status);
  60         if (status == uuid_s_ok)
  61                 return 0;
  62         else
  63                 return -1;
  64 }
  65
  66 #else
  67 #error "LTTng-Tools needs to have a UUID generator configured."
  68 #endif
  69
  70 /*
  71  * Convert a UUID to a human-readable, NULL-terminated, string of the form
  72  * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
  73  *
  74  * Assumes uuid_str is at least UUID_STR_LEN byte long.
  75  */
  76 LTTNG_HIDDEN
  77 void lttng_uuid_to_str(const unsigned char *uuid, char *uuid_str);
  78
  79 #endif /* LTTNG_UUID_H */