[Bug libc/3747] New: mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

[Bug libc/3747] New: mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

[nmiell at comcast dot net]

A simple test program which aborts immediately:

#include <stdlib.h>
#include <limits.h>

int main(void)
{
     while(1) {
	  long x = mrand48();
	  if (x > 2147483648 || x < -2147483648)
	       abort();
     }
}

-- 
           Summary: mrand48 and it's friends return values outside of [-
                    2^31, 2^31] on 64-bit platforms
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: nmiell at comcast dot net
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=3747

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[Bug libc/3747] mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

[segher at kernel dot crashing dot org]

------- Additional Comments From segher at kernel dot crashing dot org  2006-12-18 09:37 -------
Subject: Re:  New: mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

> 	  if (x > 2147483648

Invalid testcase; this number is negative with default GCC -std flag.


Segher



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[Bug libc/3747] mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

[nmiell at comcast dot net]

------- Additional Comments From nmiell at comcast dot net  2006-12-19 02:32 -------
Since you're too lazy to do the obvious:

#include <stdlib.h>
#include <stdio.h>

int main(void)
{
     while(1) {
          long x = mrand48();
          if (x > 2147483648L || x < -2147483648L) {
               printf("long: %ld, int: %d\n", x, (int) x);
               abort();
          }
     }
}

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=3747

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[Bug libc/3747] mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2006-12-19 08:18 -------
Fixed in cvs.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=3747

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[Bug libc/3747] mrand48 and it's friends return values outside of [-2^31, 2^31] on 64-bit platforms

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2007-01-12 17:52 -------
Subject: Bug 3747

CVSROOT:	/cvs/glibc
Module name:	libc
Branch: 	glibc-2_5-branch
Changes by:	jakub@sourceware.org	2007-01-12 17:52:07

Modified files:
	.              : ChangeLog 
	stdlib         : Makefile jrand48_r.c tst-rand48.c 
Added files:
	stdlib         : tst-rand48-2.c 

Log message:
	[BZ #3747]
	* stdlib/jrand48_r.c (__jrand48_r): Make sure result is in the
	[-231 .. 231) range.
	* stdlib/tst-rand48.c (main): Fix expected values for 64-bit
	targets.
	* stdlib/tst-rand48-2.c: New test.
	* stdlib/Makefile (tests): Add tst-rand48-2.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/ChangeLog.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=1.10362.2.23&r2=1.10362.2.24
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/stdlib/tst-rand48-2.c.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=NONE&r2=1.1.4.1
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/stdlib/Makefile.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=1.109&r2=1.109.2.1
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/stdlib/jrand48_r.c.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=1.9&r2=1.9.10.1
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/stdlib/tst-rand48.c.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=1.1&r2=1.1.10.1



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