xref: /llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/getrandom.c (revision 435d4124f2740f649f18e980d655cb26bee9d8cd) 
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 
main()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 }
31