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Linux/tools/testing/selftests/vDSO/vdso_test.c

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  1 /*
  2  * vdso_test.c: Sample code to test parse_vdso.c
  3  * Copyright (c) 2014 Andy Lutomirski
  4  * Subject to the GNU General Public License, version 2
  5  *
  6  * Compile with:
  7  * gcc -std=gnu99 vdso_test.c parse_vdso.c
  8  *
  9  * Tested on x86, 32-bit and 64-bit.  It may work on other architectures, too.
 10  */
 11 
 12 #include <stdint.h>
 13 #include <elf.h>
 14 #include <stdio.h>
 15 #include <sys/auxv.h>
 16 #include <sys/time.h>
 17 
 18 extern void *vdso_sym(const char *version, const char *name);
 19 extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
 20 extern void vdso_init_from_auxv(void *auxv);
 21 
 22 int main(int argc, char **argv)
 23 {
 24         unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
 25         if (!sysinfo_ehdr) {
 26                 printf("AT_SYSINFO_EHDR is not present!\n");
 27                 return 0;
 28         }
 29 
 30         vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
 31 
 32         /* Find gettimeofday. */
 33         typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);
 34         gtod_t gtod = (gtod_t)vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
 35 
 36         if (!gtod) {
 37                 printf("Could not find __vdso_gettimeofday\n");
 38                 return 1;
 39         }
 40 
 41         struct timeval tv;
 42         long ret = gtod(&tv, 0);
 43 
 44         if (ret == 0) {
 45                 printf("The time is %lld.%06lld\n",
 46                        (long long)tv.tv_sec, (long long)tv.tv_usec);
 47         } else {
 48                 printf("__vdso_gettimeofday failed\n");
 49         }
 50 
 51         return 0;
 52 }
 53 

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