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/*
* getentropy() by wrapping getrandom(), for µClibc-ng
*
* © 2025 mirabilos Ⓕ CC0 or MirBSD or GNU LGPLv2
*
* Note: may be a thread cancellation point, unlike the
* implementations in glibc and musl libc. Should this
* ever become a concern, it will need patching.
*/
#define _DEFAULT_SOURCE
#include <errno.h>
#include <unistd.h>
#include <sys/random.h>
int
getentropy(void *__buf, size_t __len)
{
ssize_t n;
if (__len > 256U) {
errno = EIO;
return (-1);
}
again:
if ((n = getrandom(__buf, __len, 0)) == -1)
switch (errno) {
case EAGAIN: /* should not happen but better safe than sorry */
case EINTR:
goto again;
default:
errno = EIO;
/* FALLTHROUGH */
case EFAULT:
case ENOSYS:
return (-1);
}
if ((size_t)n != __len)
/* also shouldn’t happen (safety net) */
goto again;
return (0);
}
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