ClickHouse/base/glibc-compatibility/musl/getentropy.c
2020-02-14 17:48:30 +03:00

34 lines
504 B
C

#define _DEFAULT_SOURCE
#include <unistd.h>
#include <sys/random.h>
#include <pthread.h>
#include <errno.h>
int getentropy(void *buffer, size_t len)
{
int cs, ret = 0;
char *pos = buffer;
if (len > 256) {
errno = EIO;
return -1;
}
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
while (len) {
ret = getrandom(pos, len, 0);
if (ret < 0) {
if (errno == EINTR) continue;
else break;
}
pos += ret;
len -= ret;
ret = 0;
}
pthread_setcancelstate(cs, 0);
return ret;
}