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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/arc4random.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-'\" t
-.\" Copyright (C) 2023 Alejandro Colomar <alx@kernel.org>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH arc4random 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-arc4random, arc4random_uniform, arc4random_buf
-\- cryptographically-secure pseudorandom number generator
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.P
-.B uint32_t arc4random(void);
-.BI "uint32_t arc4random_uniform(uint32_t " upper_bound );
-.BI "void arc4random_buf(void " buf [. n "], size_t " n );
-.fi
-.SH DESCRIPTION
-These functions give cryptographically-secure pseudorandom numbers.
-.P
-.BR arc4random ()
-returns a uniformly-distributed value.
-.P
-.BR arc4random_uniform ()
-returns a uniformly-distributed value less than
-.I upper_bound
-(see BUGS).
-.P
-.BR arc4random_buf ()
-fills the memory pointed to by
-.IR buf ,
-with
-.I n
-bytes of pseudorandom data.
-.P
-The
-.BR rand (3)
-and
-.BR drand48 (3)
-families of functions should only be used where
-the quality of the pseudorandom numbers is not a concern
-.I and
-there's a need for repeatability of the results.
-Unless you meet both of those conditions,
-use the
-.BR arc4random ()
-functions.
-.SH RETURN VALUE
-.BR arc4random ()
-returns a pseudorandom number.
-.P
-.BR arc4random_uniform ()
-returns a pseudorandom number less than
-.I upper_bound
-for valid input, or
-.B 0
-when
-.I upper_bound
-is invalid.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.na
-.nh
-.BR arc4random (),
-.BR arc4random_uniform (),
-.BR arc4random_buf ()
-T} Thread safety MT-Safe
-.TE
-.SH STANDARDS
-BSD.
-.SH HISTORY
-OpenBSD 2.1,
-FreeBSD 3.0,
-NetBSD 1.6,
-DragonFly 1.0,
-libbsd,
-glibc 2.36.
-.SH BUGS
-An
-.I upper_bound
-of
-.B 0
-doesn't make sense in a call to
-.BR arc4random_uniform ().
-Such a call will fail, and return
-.BR 0 .
-Be careful,
-since that value is
-.I not
-less than
-.IR upper_bound .
-In some cases,
-such as accessing an array,
-using that value could result in Undefined Behavior.
-.SH SEE ALSO
-.BR getrandom (3),
-.BR rand (3),
-.BR drand48 (3),
-.BR random (7)