diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/getentropy.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/getentropy.c | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/sysdeps/unix/sysv/linux/getentropy.c b/sysdeps/unix/sysv/linux/getentropy.c deleted file mode 100644 index 14e5e91392..0000000000 --- a/sysdeps/unix/sysv/linux/getentropy.c +++ /dev/null @@ -1,73 +0,0 @@ -/* Implementation of getentropy based on the getrandom system call. - Copyright (C) 2016-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#include <sys/random.h> -#include <assert.h> -#include <errno.h> -#include <unistd.h> - -#ifdef __NR_getrandom -/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on - success and -1 on failure. */ -int -getentropy (void *buffer, size_t length) -{ - /* The interface is documented to return EIO for buffer lengths - longer than 256 bytes. */ - if (length > 256) - { - __set_errno (EIO); - return -1; - } - - /* Try to fill the buffer completely. Even with the 256 byte limit - above, we might still receive an EINTR error (when blocking - during boot). */ - void *end = buffer + length; - while (buffer < end) - { - /* NB: No cancellation point. */ - ssize_t bytes = INLINE_SYSCALL_CALL (getrandom, buffer, end - buffer, 0); - if (bytes < 0) - { - if (errno == EINTR) - /* Try again if interrupted by a signal. */ - continue; - else - return -1; - } - if (bytes == 0) - { - /* No more bytes available. This should not happen under - normal circumstances. */ - __set_errno (EIO); - return -1; - } - /* Try again in case of a short read. */ - buffer += bytes; - } - return 0; -} -#else -int -getentropy (void *buffer, size_t length) -{ - __set_errno (ENOSYS); - return -1; -} -#endif |