Bug 118793 - strerror_r prototype inconsistency
strerror_r prototype inconsistency
Product: Fedora
Classification: Fedora
Component: glibc (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Jakub Jelinek
Brian Brock
Depends On:
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Reported: 2004-03-20 07:47 EST by Nigel Horne
Modified: 2007-11-30 17:10 EST (History)
3 users (show)

See Also:
Fixed In Version: 2.3.3-27
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-05-27 08:31:36 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Nigel Horne 2004-03-20 07:47:57 EST
From Bugzilla Helper:
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Description of problem:
The prototype for strerror_r given in the manual page and the one
appearing in /usr/include/string.h don't agree.

man strerror_r gives:

int strerror_r(int errnum, char *buf, size_t n);

whereas 'fgrep strerror_r /usr/include/*' gives:

/usr/include/string.h:extern char *strerror_r (int __errnum, char
*__buf, size_t __buflen) __THROW;

So, does strerror_r return an int or a char *?

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. man strerror_r
2. fgrep strerror_r /usr/include/*

Actual Results:  Prototypes differ

Expected Results:  Prototypes should agree

Additional info:

Comment 1 Jakub Jelinek 2004-03-20 08:17:20 EST
glibc strerror_r returns char * (and uses the buffer only for some
errors, for others it doesn't modify the buffer at all and just
returns a string literal (and has behaved this way at least since
1993).  It seems Unix 2003 recently added strerror_r with conflicting
prototype and behaviour (there has been no strerror_r in Unix 98)
and seems the man page describes Unix 2003 behaviour (while info strerror_r
describes the glibc behaviour).
I think glibc probably needs to change to match Unix 2003 and keep
compatibility via symbol versioning, but am not sure how many programs
will be broken by that change.
Comment 2 Jakub Jelinek 2004-05-27 08:31:36 EDT
In FC2 glibc (2.3.3-27), if you build with -D_XOPEN_SOURCE=600 or -D_POSIX_SOURCE=200112L,
strerror_r returning int will be used, otherwise the GNU variant.

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