1 /* Copyright 2020, Google Inc. All rights reserved.
2 *
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28 */
29
30 #include "test_skel.h"
31
32 #define BUFFER_SIZE 256
33
main(int argc,char * argv[])34 int main(int argc, char *argv[]) {
35 char buffer[BUFFER_SIZE];
36 // Zero it out so we can check later that it's at least not all 0s.
37 memset(buffer, 0, BUFFER_SIZE);
38 bool buffer_contains_all_zeros = true;
39
40 // Don't bother passing any flags. (If we're using lss, we might not have the
41 // right header files with the flags defined anyway, and we'd have to copy
42 // this in here too, and risk getting out of sync in yet another way.)
43 const ssize_t r = sys_getrandom(buffer, BUFFER_SIZE, 0);
44
45 // Make sure it either worked, or that it's just not supported.
46 assert(r == BUFFER_SIZE || errno == ENOSYS);
47
48 if (r == BUFFER_SIZE) {
49 // If all the bytes are 0, it didn't really work.
50 for (size_t i = 0; i < BUFFER_SIZE; ++i) {
51 if (buffer[i] != 0) {
52 buffer_contains_all_zeros = false;
53 }
54 }
55 assert(!buffer_contains_all_zeros);
56 }
57
58 return 0;
59 }
60