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      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
     21 typedef int    Bool;
     22 
     23 char* all_OSes[] = {
     24    "linux",
     25    "darwin",
     26    NULL
     27 };
     28 
     29 #if defined(VGO_linux)
     30 static 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 
     57 static 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 //---------------------------------------------------------------------------
     75 int 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