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ID Category Severity Type Date Submitted Last Update
0001033 [1003.1(2008)/Issue 7] Base Definitions and Headers Editorial Enhancement Request 2016-03-10 00:16 2020-04-14 15:41
Reporter EdSchouten View Status public  
Assigned To ajosey
Priority normal Resolution Accepted As Marked  
Status Applied  
Name Ed Schouten
User Reference
Section syslog.h
Page Number -
Line Number -
Interp Status ---
Final Accepted Text See Note: 0003568.
Summary 0001033: LOG_UPTO(): Present on all (?) systems, but not standardized?
Description The LOG_UPTO() macro is similar to LOG_MASK(): it can be used to construct a priority bitmask to be passed to setlogmask(). The difference being that LOG_UPTO() includes all priorities that are more severe to the one provided. For example:


This makes setlogmask() a lot more friendly to use.

Python's 'syslog' module provides a binding for this macro: [^] The implementation of this function calls into C's LOG_UPTO() unconditionally, making me assume that this macro is available universally. I've checked man pages of a whole bunch of operating systems and all of them seem to describe LOG_UPTO() as well.
Desired Action Have LOG_UPTO standardized.
Tags issue8
Attached Files

- Relationships

-  Notes
shware_systems (reporter)
2016-05-06 17:57

LOG_UPTO is a bug in the LSB, from a POSIX conformance standpoint. It is listed there as required when it should have #ifndef _POSIX_C_SOURCE / #endif around it in the syslog.h data definitions of ISO-23360:1996 13.4.69 (LSB 3.1 Core). That's why it's fairly common, anyways, but isn't guaranteed to be available on all UNIX systems, just LINUX ones.

That said, barring some obscure conflict with an older application using the identifier differently, I don't see any reason it shouldn't be added to syslog.h for Issue 8.
geoffclare (manager)
2016-05-07 08:05

Re: Note: 0003200 LOG_ is a reserved prefix for <syslog.h>. Implementations are allowed to make LOG_UPTO visible when _POSIX_C_SOURCE is defined (or _XOPEN_SOURCE).
geoffclare (manager)
2016-06-10 14:15

I just noticed that LOG_UPTO() was required by SUSv1 and was removed in SUSv2. Unfortunately the change history in SUSv2 does not say why it was removed.
shware_systems (reporter)
2017-02-16 19:46
edited on: 2017-02-16 19:47

Re: Note: 0003201

Yes, I was thinking XSH, #3 applied more as the ifdef would make it obvious it was an extension. I think documenting it is an extension some other way still in order for current implementations.

Don Cragun (manager)
2017-02-23 16:24
edited on: 2017-02-23 16:29

Add after P411, L13981 (<syslog.h>):
A mask for all priorities from LOG_EMERG through pri inclusive in
the order listed in the list of priority symbolic constants below. Any
additional implementation-defined priorities not included in the list
below shall not be included in the mask.

Change P411, L13982 (<syslog.h>)
The <syslog.h> header shall define the following symbolic constants for use as the priority
argument of syslog( ):

The <syslog.h> header shall define the following symbolic constants for use as the severity
level portion of the priority argument of syslog( ) and the pri argument
of the LOG_MASK( ) and LOG_UPTO( ) macros:

Add after P694, L23803 (closelog() DESCRIPTION) :
The LOG_MASK( ) and LOG_UPTO( ) macros may be used to ensure a value
or range of severity levels is properly encoded for the setlogmask( ) maskpri
argument in a portable manner. The masks produced by these macros may be OR'ed or
AND'ed with other priority masks (e.g.,


would produce the same priority mask).

- Issue History
Date Modified Username Field Change
2016-03-10 00:16 EdSchouten New Issue
2016-03-10 00:16 EdSchouten Status New => Under Review
2016-03-10 00:16 EdSchouten Assigned To => ajosey
2016-03-10 00:16 EdSchouten Name => Ed Schouten
2016-03-10 00:16 EdSchouten Section => syslog.h
2016-03-10 00:16 EdSchouten Page Number => -
2016-03-10 00:16 EdSchouten Line Number => -
2016-05-06 17:57 shware_systems Note Added: 0003200
2016-05-07 08:05 geoffclare Note Added: 0003201
2016-06-10 14:15 geoffclare Note Added: 0003263
2017-02-16 19:46 shware_systems Note Added: 0003560
2017-02-16 19:47 shware_systems Note Edited: 0003560
2017-02-23 16:24 Don Cragun Note Added: 0003568
2017-02-23 16:25 Don Cragun Note Edited: 0003568
2017-02-23 16:25 Don Cragun Tag Attached: issue8
2017-02-23 16:26 Don Cragun Interp Status => ---
2017-02-23 16:26 Don Cragun Final Accepted Text => See Note: 0003568.
2017-02-23 16:26 Don Cragun Status Under Review => Resolved
2017-02-23 16:26 Don Cragun Resolution Open => Accepted As Marked
2017-02-23 16:29 Don Cragun Note Edited: 0003568
2020-04-14 15:41 geoffclare Status Resolved => Applied

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