mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 15:00:06 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/* Implementation of getentropy based on the getrandom system call.
|
|
Copyright (C) 2016-2022 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/random.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <sysdep.h>
|
|
|
|
/* 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;
|
|
}
|