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-'\" t
-.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH mq_open 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-mq_open \- open a message queue
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.BR "#include <fcntl.h>" "           /* For O_* constants */"
-.BR "#include <sys/stat.h>" "        /* For mode constants */"
-.B #include <mqueue.h>
-.PP
-.BI "mqd_t mq_open(const char *" name ", int " oflag );
-.BI "mqd_t mq_open(const char *" name ", int " oflag ", mode_t " mode ,
-.BI "              struct mq_attr *" attr );
-.fi
-.SH DESCRIPTION
-.BR mq_open ()
-creates a new POSIX message queue or opens an existing queue.
-The queue is identified by
-.IR name .
-For details of the construction of
-.IR name ,
-see
-.BR mq_overview (7).
-.PP
-The
-.I oflag
-argument specifies flags that control the operation of the call.
-(Definitions of the flags values can be obtained by including
-.IR <fcntl.h> .)
-Exactly one of the following must be specified in
-.IR oflag :
-.TP
-.B O_RDONLY
-Open the queue to receive messages only.
-.TP
-.B O_WRONLY
-Open the queue to send messages only.
-.TP
-.B O_RDWR
-Open the queue to both send and receive messages.
-.PP
-Zero or more of the following flags can additionally be
-.IR OR ed
-in
-.IR oflag :
-.TP
-.BR O_CLOEXEC " (since Linux 2.6.26)"
-.\" commit 269f21344b23e552c21c9e2d7ca258479dcd7a0a
-Set the close-on-exec flag for the message queue descriptor.
-See
-.BR open (2)
-for a discussion of why this flag is useful.
-.TP
-.B O_CREAT
-Create the message queue if it does not exist.
-The owner (user ID) of the message queue is set to the effective
-user ID of the calling process.
-The group ownership (group ID) is set to the effective group ID
-of the calling process.
-.\" In reality the filesystem IDs are used on Linux.
-.TP
-.B O_EXCL
-If
-.B O_CREAT
-was specified in
-.IR oflag ,
-and a queue with the given
-.I name
-already exists, then fail with the error
-.BR EEXIST .
-.TP
-.B O_NONBLOCK
-Open the queue in nonblocking mode.
-In circumstances where
-.BR mq_receive (3)
-and
-.BR mq_send (3)
-would normally block, these functions instead fail with the error
-.BR EAGAIN .
-.PP
-If
-.B O_CREAT
-is specified in
-.IR oflag ,
-then two additional arguments must be supplied.
-The
-.I mode
-argument specifies the permissions to be placed on the new queue,
-as for
-.BR open (2).
-(Symbolic definitions for the permissions bits can be obtained by including
-.IR <sys/stat.h> .)
-The permissions settings are masked against the process umask.
-.PP
-The fields of the
-.I struct mq_attr
-pointed to
-.I attr
-specify the maximum number of messages and
-the maximum size of messages that the queue will allow.
-This structure is defined as follows:
-.PP
-.in +4n
-.EX
-struct mq_attr {
-    long mq_flags;       /* Flags (ignored for mq_open()) */
-    long mq_maxmsg;      /* Max. # of messages on queue */
-    long mq_msgsize;     /* Max. message size (bytes) */
-    long mq_curmsgs;     /* # of messages currently in queue
-                            (ignored for mq_open()) */
-};
-.EE
-.in
-.PP
-Only the
-.I mq_maxmsg
-and
-.I mq_msgsize
-fields are employed when calling
-.BR mq_open ();
-the values in the remaining fields are ignored.
-.PP
-If
-.I attr
-is NULL, then the queue is created with implementation-defined
-default attributes.
-Since Linux 3.5, two
-.I /proc
-files can be used to control these defaults; see
-.BR mq_overview (7)
-for details.
-.SH RETURN VALUE
-On success,
-.BR mq_open ()
-returns a message queue descriptor for use by other
-message queue functions.
-On error,
-.BR mq_open ()
-returns
-.IR "(mqd_t)\ \-1",
-with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B EACCES
-The queue exists, but the caller does not have permission to
-open it in the specified mode.
-.TP
-.B EACCES
-.I name
-contained more than one slash.
-.\" Note that this isn't consistent with the same case for sem_open()
-.TP
-.B EEXIST
-Both
-.B O_CREAT
-and
-.B O_EXCL
-were specified in
-.IR oflag ,
-but a queue with this
-.I name
-already exists.
-.TP
-.B EINVAL
-.\" glibc checks whether the name starts with a "/" and if not,
-.\" gives this error
-.I name
-doesn't follow the format in
-.BR mq_overview (7).
-.TP
-.B EINVAL
-.B O_CREAT
-was specified in
-.IR oflag ,
-and
-.I attr
-was not NULL, but
-.I attr\->mq_maxmsg
-or
-.I attr\->mq_msqsize
-was invalid.
-Both of these fields must be greater than zero.
-In a process that is unprivileged (does not have the
-.B CAP_SYS_RESOURCE
-capability),
-.I attr\->mq_maxmsg
-must be less than or equal to the
-.I msg_max
-limit, and
-.I attr\->mq_msgsize
-must be less than or equal to the
-.I msgsize_max
-limit.
-In addition, even in a privileged process,
-.I attr\->mq_maxmsg
-cannot exceed the
-.B HARD_MAX
-limit.
-(See
-.BR mq_overview (7)
-for details of these limits.)
-.TP
-.B EMFILE
-The per-process limit on the number of open file
-and message queue descriptors has been reached
-(see the description of
-.B RLIMIT_NOFILE
-in
-.BR getrlimit (2)).
-.TP
-.B ENAMETOOLONG
-.I name
-was too long.
-.TP
-.B ENFILE
-The system-wide limit on the total number of open files
-and message queues has been reached.
-.TP
-.B ENOENT
-The
-.B O_CREAT
-flag was not specified in
-.IR oflag ,
-and no queue with this
-.I name
-exists.
-.TP
-.B ENOENT
-.I name
-was just "/" followed by no other characters.
-.\" Note that this isn't consistent with the same case for sem_open()
-.TP
-.B ENOMEM
-Insufficient memory.
-.TP
-.B ENOSPC
-Insufficient space for the creation of a new message queue.
-This probably occurred because the
-.I queues_max
-limit was encountered; see
-.BR mq_overview (7).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR mq_open ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH VERSIONS
-.SS C library/kernel differences
-The
-.BR mq_open ()
-library function is implemented on top of a system call of the same name.
-The library function performs the check that the
-.I name
-starts with a slash (/), giving the
-.B EINVAL
-error if it does not.
-The kernel system call expects
-.I name
-to contain no preceding slash,
-so the C library function passes
-.I name
-without the preceding slash (i.e.,
-.IR name+1 )
-to the system call.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH BUGS
-Before Linux 2.6.14,
-the process umask was not applied to the permissions specified in
-.IR mode .
-.SH SEE ALSO
-.BR mq_close (3),
-.BR mq_getattr (3),
-.BR mq_notify (3),
-.BR mq_receive (3),
-.BR mq_send (3),
-.BR mq_unlink (3),
-.BR mq_overview (7)