src/lib/osinfo/libc.c

   1 /* Copyright (c) 2001 Matej Pfajfar.
   2  * Copyright (c) 2001-2004, Roger Dingledine.
   3  * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
   4  * Copyright (c) 2007-2021, The Tor Project, Inc. */
   5 /* See LICENSE for licensing information */
   6
   7 /**
   8  * @file libc.c
   9  * @brief Functions to get the name and version of the system libc.
  10  **/
  11
  12 #include "orconfig.h"
  13 #include "lib/osinfo/libc.h"
  14 #include <stdlib.h>
  15
  16 #ifdef HAVE_GNU_LIBC_VERSION_H
  17 #include <gnu/libc-version.h>
  18 #endif
  19
  20 #ifdef HAVE_GNU_LIBC_VERSION_H
  21 #ifdef HAVE_GNU_GET_LIBC_VERSION
  22 #define CHECK_LIBC_VERSION
  23 #endif
  24 #endif
  25
  26 #define STR_IMPL(x) #x
  27 #define STR(x) STR_IMPL(x)
  28
  29 /** Return the name of the compile time libc. Returns NULL if we
  30  * cannot identify the libc. */
  31 const char *
  32 tor_libc_get_name(void)
  33 {
  34 #ifdef __GLIBC__
  35   return "Glibc";
  36 #else /* !defined(__GLIBC__) */
  37   return NULL;
  38 #endif /* defined(__GLIBC__) */
  39 }
  40
  41 /** Return a string representation of the version of the currently running
  42  * version of Glibc. */
  43 const char *
  44 tor_libc_get_version_str(void)
  45 {
  46 #ifdef CHECK_LIBC_VERSION
  47   const char *version = gnu_get_libc_version();
  48   if (version == NULL)
  49     return "N/A";
  50   return version;
  51 #else /* !defined(CHECK_LIBC_VERSION) */
  52   return "N/A";
  53 #endif /* defined(CHECK_LIBC_VERSION) */
  54 }
  55
  56 /** Return a string representation of the version of Glibc that was used at
  57  * compilation time. */
  58 const char *
  59 tor_libc_get_header_version_str(void)
  60 {
  61 #ifdef __GLIBC__
  62   return STR(__GLIBC__) "." STR(__GLIBC_MINOR__);
  63 #else
  64   return "N/A";
  65 #endif /* defined(__GLIBC__) */
  66 }