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ID Category Severity Type Date Submitted Last Update
0000447 [1003.1(2008)/Issue 7] System Interfaces Objection Enhancement Request 2011-05-19 19:48 2013-04-16 13:06
Reporter eblake View Status public  
Assigned To ajosey
Priority normal Resolution Accepted As Marked  
Status Closed  
Name Eric Blake
Organization Red Hat
User Reference ebb.strerror_r
Section strerror
Page Number 1999
Line Number 63245
Interp Status Approved
Final Accepted Text See Note: 0000808
Summary 0000447: strerror_r and strerror_l error checking
Description The standard is clear that checking for errors from strerror( ) requires
priming errno to 0, but sterror_l( ) needs the same treatment, since it
is required to return a string in the optional EINVAL case for an
out-of-range errnum, and NULL is only reserved for other failures like
EINVAL for a bad locale object. Meanwhile, since strerror( ) must not
modify errno on success, it makes sense to require the same for
strerror_r( ).
Desired Action At line 63244 [XSH strerror DESCRIPTION], change:

The strerror( ) and strerror_l( ) functions shall not change the setting of
errno if successful.

Since no return value is reserved to indicate an error, an application
wishing to check for error situations should set errno to 0, then call
strerror( ), then check errno.

to:

The strerror( ) and strerror_l( ) functions shall not change the setting of
errno if successful. The strerror_r( ) function shall not change the
setting of errno.

Since no return value is reserved to indicate an error of strerror( ), an
application wishing to check for error situations should set errno to 0,
then call strerror( ), then check errno. Similarly, since strerror_l( )
is required to return a string for some errors, an application wishing to
check for all error situations should set errno to 0, then call
strerror_l( ), then check errno.
Tags tc1-2008
Attached Files

- Relationships
related to 0000384Closedajosey the stdarg macros should not modify errno 

-  Notes
(0000808)
nick (manager)
2011-06-09 15:55

 Interpretation response
------------------------

The standard does not speak to this issue, and as such no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor.

Rationale:
-------------
See description.

Notes to the Editor (not part of this interpretation):
-------------------------------------------------------

At line 63244 [XSH strerror DESCRIPTION], change:

The strerror( ) and strerror_l( ) functions shall not change the setting of
errno if successful.

Since no return value is reserved to indicate an error, an application
wishing to check for error situations should set errno to 0, then call
strerror( ), then check errno.

to:

The strerror( ) and strerror_l( ) functions shall not change the setting of
errno if successful.

Since no return value is reserved to indicate an error of strerror( ), an
application wishing to check for error situations should set errno to 0,
then call strerror( ), then check errno. Similarly, since strerror_l( )
is required to return a string for some errors, an application wishing to
check for all error situations should set errno to 0, then call
strerror_l( ), then check errno.
(0000809)
nick (manager)
2011-06-09 15:57

 The interpretation response above does not include the changes strerror_r suggested by the submitter. The change proposed here is suitable for TC1, but strerror_r should wait for the next revision. A separate bug should be filed if that is desired.
(0000852)
ajosey (manager)
2011-06-16 10:18

 Interpretation proposed 16 June 2011 for final 30 day review
(0000900)
ajosey (manager)
2011-07-29 06:12

 The interpretation is now approved.

- Issue History
Date Modified Username Field Change
2011-05-19 19:48 eblake New Issue
2011-05-19 19:48 eblake Status New => Under Review
2011-05-19 19:48 eblake Assigned To => ajosey
2011-05-19 19:48 eblake Name => Eric Blake
2011-05-19 19:48 eblake Organization => Red Hat
2011-05-19 19:48 eblake User Reference => ebb.strerror_r
2011-05-19 19:48 eblake Section => strerror
2011-05-19 19:48 eblake Page Number => 1999
2011-05-19 19:48 eblake Line Number => 63245
2011-05-19 19:48 eblake Interp Status => ---
2011-06-09 15:55 nick Note Added: 0000808
2011-06-09 15:55 nick Interp Status --- => Pending
2011-06-09 15:55 nick Final Accepted Text => See Note: 0000808
2011-06-09 15:55 nick Status Under Review => Interpretation Required
2011-06-09 15:55 nick Resolution Open => Accepted As Marked
2011-06-09 15:56 nick Tag Attached: tc1-2008
2011-06-09 15:57 nick Note Added: 0000809
2011-06-16 10:18 ajosey Interp Status Pending => Proposed
2011-06-16 10:18 ajosey Note Added: 0000852
2011-07-29 06:12 ajosey Interp Status Proposed => Approved
2011-07-29 06:12 ajosey Note Added: 0000900
2013-04-16 13:06 ajosey Status Interpretation Required => Closed
2016-07-28 15:07 eblake Relationship added related to 0000384

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