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ID Category Severity Type Date Submitted Last Update
0000223 [1003.1(2008)/Issue 7] System Interfaces Editorial Enhancement Request 2010-02-24 21:16 2010-03-04 16:52
Reporter EdSchouten View Status public  
Assigned To ajosey
Priority normal Resolution Rejected  
Status Resolved  
Name Ed Schouten
Organization
User Reference
Section <mqueue.h>
Page Number 294
Line Number 9862-9869
Interp Status ---
Final Accepted Text
Summary 0000223: mq_* routines use char * for data buffer
Description The <mqueue.h> header provides the following functions:

ssize_t mq_receive(mqd_t, char *, size_t, unsigned *);
int mq_send(mqd_t, const char *, size_t, unsigned);
int mq_setattr(mqd_t, const struct mq_attr *restrict,
             struct mq_attr *restrict);
ssize_t mq_timedreceive(mqd_t, char *restrict, size_t,
             unsigned *restrict, const struct timespec *restrict);
int mq_timedsend(mqd_t, const char *, size_t, unsigned,
             const struct timespec *);

For some reason I've never understood why these routines use char *'s for data buffers, while functions like write() and send() use a void *. Message queues don't use strings. Message queues are binary safe.
Desired Action Change the prototypes to use void * instead:

ssize_t mq_receive(mqd_t, void *, size_t, unsigned *);
int mq_send(mqd_t, const void *, size_t, unsigned);
int mq_setattr(mqd_t, const struct mq_attr *restrict,
             struct mq_attr *restrict);
ssize_t mq_timedreceive(mqd_t, void *restrict, size_t,
             unsigned *restrict, const struct timespec *restrict);
int mq_timedsend(mqd_t, const void *, size_t, unsigned,
             const struct timespec *);

I suspect this will break code that uses function pointers to refer to these functions, but code that just calls these functions will not be affected.
Tags No tags attached.
Attached Files

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-  Notes
(0000395)
Don Cragun (manager)
2010-03-04 16:52

 Although we agree that it would have been better if these functions had been designed this way to begin with, we believe that making the change now will break existing, conforming code with no real benefit.

- Issue History
Date Modified Username Field Change
2010-02-24 21:16 EdSchouten New Issue
2010-02-24 21:16 EdSchouten Status New => Under Review
2010-02-24 21:16 EdSchouten Assigned To => ajosey
2010-02-24 21:16 EdSchouten Name => Ed Schouten
2010-02-24 21:16 EdSchouten Section => <mqueue.h>
2010-02-24 21:16 EdSchouten Page Number => n/a
2010-02-24 21:16 EdSchouten Line Number => n/a
2010-03-04 16:48 nick Page Number n/a => 294
2010-03-04 16:48 nick Line Number n/a => 9862-9869
2010-03-04 16:48 nick Interp Status => ---
2010-03-04 16:52 Don Cragun Note Added: 0000395
2010-03-04 16:52 Don Cragun Status Under Review => Resolved
2010-03-04 16:52 Don Cragun Resolution Open => Rejected

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