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#define _BSD_SOURCE
#include <unistd.h>
#include <sys/random.h>
#include <pthread.h>
#include <errno.h>
#ifdef __EMSCRIPTEN__
#include <wasi/wasi-helpers.h>
#endif
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);
#ifdef __EMSCRIPTEN__
ret = __wasi_syscall_ret(__wasi_random_get(buffer, len));
#else
while (len) {
ret = getrandom(pos, len, 0);
if (ret < 0) {
if (errno == EINTR) continue;
else break;
}
pos += ret;
len -= ret;
ret = 0;
}
#endif
pthread_setcancelstate(cs, 0);
return ret;
}
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