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-.\" Copyright (C) 2017, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH getentropy 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-getentropy \- fill a buffer with random bytes
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "int getentropy(void " buffer [. length "], size_t " length );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR getentropy ():
-.nf
-    _DEFAULT_SOURCE
-.fi
-.SH DESCRIPTION
-The
-.BR getentropy ()
-function writes
-.I length
-bytes of high-quality random data to the buffer starting
-at the location pointed to by
-.IR buffer .
-The maximum permitted value for the
-.I length
-argument is 256.
-.P
-A successful call to
-.BR getentropy ()
-always provides the requested number of bytes of entropy.
-.SH RETURN VALUE
-On success, this function returns zero.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EFAULT
-Part or all of the buffer specified by
-.I buffer
-and
-.I length
-is not in valid addressable memory.
-.TP
-.B EIO
-.I length
-is greater than 256.
-.TP
-.B EIO
-An unspecified error occurred while trying to overwrite
-.I buffer
-with random data.
-.TP
-.B ENOSYS
-This kernel version does not implement the
-.BR getrandom (2)
-system call required to implement this function.
-.SH STANDARDS
-None.
-.SH HISTORY
-glibc 2.25.
-OpenBSD.
-.SH NOTES
-The
-.BR getentropy ()
-function is implemented using
-.BR getrandom (2).
-.P
-Whereas the glibc wrapper makes
-.BR getrandom (2)
-a cancelation point,
-.BR getentropy ()
-is not a cancelation point.
-.P
-.BR getentropy ()
-is also declared in
-.BR <sys/random.h> .
-(No feature test macro need be defined to obtain the declaration from
-that header file.)
-.P
-A call to
-.BR getentropy ()
-may block if the system has just booted and the kernel has
-not yet collected enough randomness to initialize the entropy pool.
-In this case,
-.BR getentropy ()
-will keep blocking even if a signal is handled,
-and will return only once the entropy pool has been initialized.
-.SH SEE ALSO
-.BR getrandom (2),
-.BR urandom (4),
-.BR random (7)