/* * vdso_test.c: Sample code to test parse_vdso.c * Copyright (c) 2014 Andy Lutomirski * Subject to the GNU General Public License, version 2 * * Compile with: * gcc -std=gnu99 vdso_test.c parse_vdso.c * * Tested on x86, 32-bit and 64-bit. It may work on other architectures, too. */ #include #include #include #include #include extern void *vdso_sym(const char *version, const char *name); extern void vdso_init_from_sysinfo_ehdr(uintptr_t base); extern void vdso_init_from_auxv(void *auxv); int main(int argc, char **argv) { unsigned long sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR); if (!sysinfo_ehdr) { printf("AT_SYSINFO_EHDR is not present!\n"); return 0; } vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR)); /* Find gettimeofday. */ typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz); gtod_t gtod = (gtod_t)vdso_sym("LINUX_2.6", "__vdso_gettimeofday"); if (!gtod) { printf("Could not find __vdso_gettimeofday\n"); return 1; } struct timeval tv; long ret = gtod(&tv, 0); if (ret == 0) { printf("The time is %lld.%06lld\n", (long long)tv.tv_sec, (long long)tv.tv_usec); } else { printf("__vdso_gettimeofday failed\n"); } return 0; } ype='submit' value='switch'/> net-next plumbingsTobias Klauser

path: root/net/nfc

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