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ID Category Severity Type Date Submitted Last Update
0000592 [1003.1(2008)/Issue 7] Base Definitions and Headers Objection Omission 2012-07-13 01:48 2024-06-11 08:52
Reporter eblake View Status public  
Assigned To ajosey
Priority normal Resolution Accepted  
Status Closed  
Name Eric Blake
Organization Red Hat
User Reference ebb.timespec
Section trace.h, others
Page Number 426
Line Number 14305
Interp Status ---
Final Accepted Text
Summary 0000592: consistent use of struct timespec
Description Most headers that use struct timespec require that it be defined as in <time.h> (<aio.h> line 7210, <mqueue.h> line 9846, <pthread.h> line 10543, <sched.h> line 10756, <signal.h> line 10967, <sys/select.h> line 12650, <sys/stat.h> line 13044).

However, while <semaphore.h> permits the inclusion of <time.h> (line 10892), it does not require it and does not mandate that a forward reference to struct timespec be in place before the declaration of sem_timedwait(), which means that the declaration could be inadvertently declaring a pointer to a unique type if the headers are included in the wrong order. Worse, <trace.h> directly uses struct timespec (line 14264), but does not require either the type to exist nor the use of <time.h>. Both of these go against the goal of Issue 7 in making more headers self-contained.

Finally, a number of functions list the inclusion of <time.h> in their SYNOPSIS section, supposedly to guarantee the correct struct timespec, although this is redundant as demonstrated by the requirements listed above.
Desired Action After line 10877 (XBD <semaphore.h> DESCRIPTION), add a paragraph:

The <semaphore.h> header shall define the struct timespec structure as described in <time.h>.

After line 14305 (XBD <trace.h> DESCRIPTION), add a paragraph:

The <trace.h> header shall define the struct timespec structure as described in <time.h>.

At line 14390 (XBD <trace.h> SEE ALSO), add a link to <time.h>.

Delete lines 43751-43752 (XSH mq_receive SYNOPSIS):
#include <mqueue.h>
#include <time.h>

Delete this sentence at line 43785 (XSH mq_receive DESCRIPTION):
The timespec argument is defined in the <time.h> header.

Delete lines 43849-43850 (XSH mq_send SYNOPSIS).
#include <mqueue.h>
#include <time.h>

Delete this sentence at line 43883 (XSH mq_send DESCRIPTION):
The timespec argument is defined in the <time.h> header.

Delete line 43979 (XSH mq_timedreceive SYNOPSIS):
#include <time.h>

Delete line 43989 (XSH mq_timedsend SYNOPSIS):
#include <time.h>

Delete line 47520 (XSH posix_trace_attr_getclockres SYNOPSIS):
#include <time.h>

Delete this sentence at line 48642 (XSH posix_trace_getnext_event DESCRIPTION):
The timespec data type is defined in the <time.h> header.

Delete line 52844 (XSH pthread_mutex_timedlock SYNOPSIS):
#include <time.h>

Delete this sentence at line 52857 (XSH pthread_mutex_timedlock DESCRIPTION):
The timespec data type is defined in the <time.h> header.

Delete line 53864 (XSH pthread_rwlock_timedrdlock SYNOPSIS):
#include <time.h>

Delete this sentence at line 53876 (XSH pthread_rwlock_timedrdlock DESCRIPTION):
The timespec data type is defined in the <time.h> header.

Delete line 53927 (XSH pthread_rwlock_timedwrlock SYNOPSIS):
#include <time.h>

Delete this sentence at line 53939 (XSH pthread_rwlock_timedwrlock DESCRIPTION):
The timespec data type is defined in the <time.h> header.

Delete line 58251 (XSH sem_timedwait SYNOPSIS):
#include <time.h>

Delete this sentence at line 58264 (XSH sem_timedwait DESCRIPTION):
The timespec data type is defined as a structure in the <time.h> header.
Tags issue8
Attached Files

- Relationships

-  Notes
(0001627)
jim_pugsley (manager)
2013-05-30 14:09

According to comments in our version of semaphore.h:

 * Inclusion of <time.h> breaks X/Open and POSIX namespace.
 * The timespec structure while allowed in XPG6 and POSIX.1003d-1999,
 * is not permitted in prior POSIX or X/Open specifications even
 * though functions beginning with sem_* are allowed.

- Issue History
Date Modified Username Field Change
2012-07-13 01:48 eblake New Issue
2012-07-13 01:48 eblake Status New => Under Review
2012-07-13 01:48 eblake Assigned To => ajosey
2012-07-13 01:48 eblake Name => Eric Blake
2012-07-13 01:48 eblake Organization => Red Hat
2012-07-13 01:48 eblake User Reference => ebb.timespec
2012-07-13 01:48 eblake Section => trace.h, others
2012-07-13 01:48 eblake Page Number => 426
2012-07-13 01:48 eblake Line Number => 14305
2012-07-13 01:48 eblake Interp Status => ---
2013-05-30 14:09 jim_pugsley Note Added: 0001627
2013-08-01 15:19 jim_pugsley Status Under Review => Resolved
2013-08-01 15:19 jim_pugsley Resolution Open => Accepted
2013-08-01 15:23 Don Cragun Tag Attached: issue8
2020-03-20 09:38 geoffclare Status Resolved => Applied
2024-06-11 08:52 agadmin Status Applied => Closed


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