06-27-2013
If you got a positive number from open(), then the errno was set earlier by some other call, unless your code does something interesting or untoward.... We do need to see some code please.
Note that system calls do not reset errno to zero, so if you do not reliably check returns codes, then it may not be possible to see where the error originated. system calls set errno ONLY when they have an error condition.
This User Gave Thanks to jim mcnamara For This Post:
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LEARN ABOUT OSF1
mq_unlink
mq_unlink(3) Library Functions Manual mq_unlink(3)
NAME
mq_unlink - Removes a message queue (P1003.1b)
LIBRARY
Realtime Library (librt.so, librt.a)
SYNOPSIS
#include <mqueue.h>
int mq_unlink (
const char *name);
PARAMETERS
*name Specifies a pointer to the pathname of a message queue.
DESCRIPTION
The mq_unlink function removes a message queue named by the pathname. After a successful call to this function, subsequent calls to the
mq_open function fail if they specify the queue identified by the name argument and the O_CREAT flag is not set.
Close the connection to the queue with a call to the mq_close function before calling the mq_unlink function. If one or more processes have
the message queue open when mq_unlink is called, destruction of the queue is postponed until all references to the message queue are
removed. In this situation, the mq_unlink function returns immediately, without waiting for all queue references to be closed.
RETURN VALUES
On successful completion, the function returns the value 0 (zero); otherwise, the function returns the value -1, sets errno to indicate the
error, and the message queue remains.
ERRORS
The mq_unlink function fails under the following conditions:
[EACCES] Permission is denied to unlink the message queue.
[ENAMETOOLONG] The length of the name string exceeds {NAME_MAX} while {_POSIX_NO_TRUNC} is in effect.
[ENOENT] The named message queue does not exist.
Additionally, any error that can be returned by the open or fstat file system calls can be returned by the mq_unlink function.
RELATED INFORMATION
Functions: mq_close(3), mq_open(3)
Guide to Realtime Programming delim off
mq_unlink(3)