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44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/* Implementation of the getrandom system call.
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/random.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sysdep-cancel.h>
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#ifdef __NR_getrandom
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/* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on
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success and -1 on failure. */
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ssize_t
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getrandom (void *buffer, size_t length, unsigned int flags)
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{
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return SYSCALL_CANCEL (getrandom, buffer, length, flags);
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}
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#else
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/* Always provide a definition, even if the kernel headers lack the
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system call number. */
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ssize_t
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getrandom (void *buffer, size_t length, unsigned int flags)
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{
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/* Ideally, we would add a cancellation point here, but we currently
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cannot do so inside libc. */
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__set_errno (ENOSYS);
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return -1;
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}
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#endif
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