compiler-rt/test/sanitizer_common/TestCases/Posix/getrandom.c

   1 // RUN: %clang -O2 %s -o %t && %run %t
   2 // UNSUPPORTED: android, darwin, target={{.*(netbsd|solaris).*}}
   3 //
   4
   5 #include <sys/types.h>
   6 #include <errno.h>
   7
   8 #if !defined(__GLIBC_PREREQ)
   9 #define __GLIBC_PREREQ(a, b) 0
  10 #endif
  11
  12 #if (defined(__linux__) && __GLIBC_PREREQ(2, 25)) || defined(__FreeBSD__) || \
  13     (defined(__sun) && defined(__svr4__))
  14 #define HAS_GETRANDOM
  15 #endif
  16
  17 #if defined(HAS_GETRANDOM)
  18 #include <sys/random.h>
  19 #endif
  20
  21 int main() {
  22   char buf[16];
  23   ssize_t n = 1;
  24 #if defined(HAS_GETRANDOM)
  25   n = getrandom(buf, sizeof(buf), 0);
  26   if (n == -1 && errno == ENOSYS)
  27     n = 1;
  28 #endif
  29   return (int)(n <= 0);
  30 }