mq_unlink(3c) [opensolaris man page]
mq_unlink(3C) Standard C Library Functions mq_unlink(3C) NAME
mq_unlink - remove a message queue SYNOPSIS
#include <mqueue.h> int mq_unlink(const char *name); DESCRIPTION
The mq_unlink() function removes the message queue named by the pathname name. After a successful call to mq_unlink() with name, a call to mq_open(3C) with name fails if the flag O_CREAT is not set in flags. If one or more processes have the message queue open when mq_unlink() is called, destruction of the message queue is postponed until all references to the message queue have been closed. Calls to mq_open(3C) to re-create the message queue may fail until the message queue is actually removed. However, the mq_unlink() call need not block until all references have been closed; it may return immediately. RETURN VALUES
Upon successful completion, mq_unlink() returns 0; otherwise, the named message queue is not changed by this function call, the function returns -1 and sets errno to indicate the error. ERRORS
The mq_unlink() function will fail if: EACCES Permission is denied to unlink the named message queue. ENAMETOOLONG The length of the name string exceeds PATH_MAX, or a pathname component is longer than NAME_MAX while _POSIX_NO_TRUNC is in effect. ENOENT The named message queue, name, does not exist. ENOSYS mq_unlink() is not supported by the system. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ |ATTRIBUTE TYPE |ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+ SEE ALSO
mqueue.h(3HEAD), mq_close(3C), mq_open(3C), attributes(5), standards(5) NOTES
Solaris 2.6 was the first release to support the Asynchronous Input and Output option. Prior to this release, this function always returned -1 and set errno to ENOSYS. SunOS 5.11 5 Feb 2008 mq_unlink(3C)
Check Out this Related Man Page
MQ_UNLINK(3P) POSIX Programmer's Manual MQ_UNLINK(3P) PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
mq_unlink -- remove a message queue (REALTIME) SYNOPSIS
#include <mqueue.h> int mq_unlink(const char *name); DESCRIPTION
The mq_unlink() function shall remove the message queue named by the string name. If one or more processes have the message queue open when mq_unlink() is called, destruction of the message queue shall be postponed until all references to the message queue have been closed. However, the mq_unlink() call need not block until all references have been closed; it may return immediately. After a successful call to mq_unlink(), reuse of the name shall subsequently cause mq_open() to behave as if no message queue of this name exists (that is, mq_open() will fail if O_CREAT is not set, or will create a new message queue if O_CREAT is set). RETURN VALUE
Upon successful completion, the function shall return a value of zero. Otherwise, the named message queue shall be unchanged by this func- tion call, and the function shall return a value of -1 and set errno to indicate the error. ERRORS
The mq_unlink() function shall fail if: EACCES Permission is denied to unlink the named message queue. ENOENT The named message queue does not exist. The mq_unlink() function may fail if: ENAMETOOLONG The length of the name argument exceeds {_POSIX_PATH_MAX} on systems that do not support the XSI option or exceeds {_XOPEN_PATH_MAX} on XSI systems, or has a pathname component that is longer than {_POSIX_NAME_MAX} on systems that do not support the XSI option or longer than {_XOPEN_NAME_MAX} on XSI systems. A call to mq_unlink() with a name argument that contains the same message queue name as was previously used in a successful mq_open() call shall not give an [ENAMETOOLONG] error. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
None. RATIONALE
None. FUTURE DIRECTIONS
A future version might require the mq_open() and mq_unlink() functions to have semantics similar to normal file system operations. SEE ALSO
mq_close(), mq_open(), msgctl(), msgget(), msgrcv(), msgsnd() The Base Definitions volume of POSIX.1-2008, <mqueue.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan- dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html . Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . IEEE
/The Open Group 2013 MQ_UNLINK(3P)