esp-idf/components/newlib/getentropy.c

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/*
* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <sys/random.h>
#include <errno.h>
int getentropy(void *buffer, size_t length)
{
ssize_t ret;
if (buffer == NULL) {
errno = EFAULT;
return -1;
}
if (length > 256) {
errno = EIO;
return -1;
}
ret = getrandom(buffer, length, 0);
if (ret == -1) {
return -1;
}
return 0;
}