Bug 25553 – pread function versioned incorrectly

Bug 25553 - pread function versioned incorrectly

Summary:	pread function versioned incorrectly

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	glibc (Show other bugs)
Sub Component:
Version:	7.0
Hardware:	i386 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Jakub Jelinek
QA Contact:	Aaron Brown
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Reported:	2001-02-01 17:36 EST by Ben LaHaise
Modified:	2016-11-24 10:11 EST (History)
CC List:	1 user (show)

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Doc Type:	Bug Fix
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Last Closed:	2001-02-01 17:36:46 EST
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Description Ben LaHaise 2001-02-01 17:36:43 EST

Compiling the following test program on an RH7 or 7.1beta machine results
in a program that does not run on a 6.2 box, even though the pread function
definition has not changed.

gcc -Wall -lpthread -lrt -o pread_test pread_test.c

int main()
{
	char buf[256];
	pread(0, buf, 0, 0);
	return 0;
}

Comment 1 Jakub Jelinek 2001-02-02 10:43:40 EST

It has changed, because in glibc 2.1.3 and below it had no linuxthreads
wrapper. And no matter what, symbol versioning is about upward binary
compatibility so older binaries work with newer libc, not vice versa.
pread and family could not be put into GLIBC_2.1.3 because 2.1.3 was released,
and e.g. rpm would be severely confused if we started adding symbols @GLIBC_2.1
now.

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