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random.3: Change "RAND_MAX" tp "2^31-1" 

RAND_MAX is for rand(3).  POSIX fixes random()'s range at 2^31-1;
RAND_MAX may be smaller on some platforms (even though with glibc
or musl on Linux they are the same).

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
John Marshall 2020-06-08 12:04:16 +01:00 committed by Michael Kerrisk
parent e9898cc8ba
commit 2de361c8e9
1 changed files with 4 additions and 2 deletions
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6
man3/random.3
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@ -69,7 +69,7 @@ The
function uses a nonlinear additive feedback random
number generator employing a default table of size 31 long integers to
return successive pseudo-random numbers in
the range from 0 to \fBRAND_MAX\fR.
the range from 0 to 2^31\ \-\ 1.
The period of this random number generator is very large, approximately
.IR "16\ *\ ((2^31)\ \-\ 1)" .
.PP
@ -125,7 +125,9 @@ or be the result of a previous call of
The
.BR random ()
function returns a value between 0 and
.BR RAND_MAX .
.BR INT32_MAX ,
i.e.,
.IR "(2^31)\ \-\ 1" .
The
.BR srandom ()
function returns no value.