mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-21 10:20:06 +00:00
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/* Implementation of 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 <errno.h>
|
|
#include <unistd.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
#ifdef __NR_getrandom
|
|
/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on
|
|
success and -1 on failure. */
|
|
ssize_t
|
|
getrandom (void *buffer, size_t length, unsigned int flags)
|
|
{
|
|
return SYSCALL_CANCEL (getrandom, buffer, length, flags);
|
|
}
|
|
#else
|
|
/* Always provide a definition, even if the kernel headers lack the
|
|
system call number. */
|
|
ssize_t
|
|
getrandom (void *buffer, size_t length, unsigned int flags)
|
|
{
|
|
/* Ideally, we would add a cancellation point here, but we currently
|
|
cannot do so inside libc. */
|
|
__set_errno (ENOSYS);
|
|
return -1;
|
|
}
|
|
#endif
|