os_test.c revision b32f58018498ea2225959b0ba11c18f0c433deef 
1
2#include <stdio.h>
3#include <stdlib.h>
4#include <string.h>
5
6// This program determines which OS that this Valgrind installation
7// supports, which depends on what was chosen at configure-time.
8//
9// We return:
10// - 0 if the machine matches the asked-for OS and satisfies a
11//     version requirement, if any
12// - 1 if it doesn't match but does match the name of another OS
13// - 2 if it doesn't match the name of any OS
14// - 3 if there was a usage error (it also prints an error message)
15
16// Nb: When updating this file for a new OS, add the name to
17// 'all_OSes' as well as adding go().
18
19#define False  0
20#define True   1
21typedef int    Bool;
22
23char* all_OSes[] = {
24   "linux",
25   "darwin",
26   NULL
27};
28
29#if defined(VGO_linux)
30static Bool matches_version(char *min_version)
31{
32   int a1, a2, a3, g1, g2, g3;  // 'a' = actual;  'g' = given
33
34   if (min_version == NULL)  return True;  // no version specified
35
36   // get actual version number
37   FILE *fp = fopen("/proc/sys/kernel/osrelease", "r");
38   if (fp == NULL || fscanf(fp, "%d.%d.%d", &a1, &a2, &a3) != 3) return False;
39   fclose(fp);
40
41   // parse given version number
42   if (sscanf(min_version, "%d.%d.%d", &g1, &g2, &g3) != 3) return False;
43
44//   printf("actual %d %d %d\n", a1, a2,a3);
45//   printf("given  %d %d %d\n", g1, g2,g3);
46
47   if (a1 > g1) return True;
48   if (a1 < g1) return False;
49   if (a2 > g2) return True;
50   if (a2 < g2) return False;
51   if (a3 >= g3) return True;
52
53   return False;
54}
55#endif
56
57static Bool go(char* OS, char *min_version)
58{
59#if defined(VGO_linux)
60   if ( 0 == strcmp( OS, "linux" ) && matches_version( min_version )) return True;
61
62#elif defined(VGO_darwin)
63   if ( 0 == strcmp( OS, "darwin" ) ) return True;
64
65#else
66#  error Unknown OS
67#endif   // VGO_*
68
69   return False;
70}
71
72//---------------------------------------------------------------------------
73// main
74//---------------------------------------------------------------------------
75int main(int argc, char **argv)
76{
77   int i;
78   if ( argc < 2 ) {
79      fprintf( stderr, "usage: os_test <OS-type> [<min-version>]\n" );
80      exit(3);             // Usage error.
81   }
82   if (go( argv[1], argv[2] )) {
83      return 0;            // Matched.
84   }
85   for (i = 0; NULL != all_OSes[i]; i++) {
86      if ( 0 == strcmp( argv[1], all_OSes[i] ) )
87         return 1;         // Didn't match, but named another OS.
88   }
89   return 2;               // Didn't match any OSes.
90}
91
92