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1 #define _BSD_SOURCE
2 #include <unistd.h>
3 #include <sys/random.h>
4 #include <pthread.h>
5 #include <errno.h>
6 
getentropy(void * buffer,size_t len)7 int getentropy(void *buffer, size_t len)
8 {
9 	int cs, ret = 0;
10 	char *pos = buffer;
11 
12 	if (len > 256) {
13 		errno = EIO;
14 		return -1;
15 	}
16 
17 	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
18 
19 	while (len) {
20 		ret = getrandom(pos, len, 0);
21 		if (ret < 0) {
22 			if (errno == EINTR) continue;
23 			else break;
24 		}
25 		pos += ret;
26 		len -= ret;
27 		ret = 0;
28 	}
29 
30 	pthread_setcancelstate(cs, 0);
31 
32 	return ret;
33 }
34