Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 229 deletions

diff --git a/man3/mq_getattr.3 b/man3/mq_getattr.3
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-'\" t
-.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH mq_getattr 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-mq_getattr, mq_setattr \- get/set message queue attributes
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.B #include <mqueue.h>
-.P
-.BI "int mq_getattr(mqd_t " mqdes ", struct mq_attr *" attr );
-.BI "int mq_setattr(mqd_t " mqdes ", const struct mq_attr *restrict " newattr ,
-.BI "               struct mq_attr *restrict " oldattr );
-.fi
-.SH DESCRIPTION
-.BR mq_getattr ()
-and
-.BR mq_setattr ()
-respectively retrieve and modify attributes of the message queue
-referred to by the message queue descriptor
-.IR mqdes .
-.P
-.BR mq_getattr ()
-returns an
-.I mq_attr
-structure in the buffer pointed by
-.IR attr .
-This structure is defined as:
-.P
-.in +4n
-.EX
-struct mq_attr {
-    long mq_flags;       /* Flags: 0 or O_NONBLOCK */
-    long mq_maxmsg;      /* Max. # of messages on queue */
-    long mq_msgsize;     /* Max. message size (bytes) */
-    long mq_curmsgs;     /* # of messages currently in queue */
-};
-.EE
-.in
-.P
-The
-.I mq_flags
-field contains flags associated with the open message queue description.
-This field is initialized when the queue is created by
-.BR mq_open (3).
-The only flag that can appear in this field is
-.BR O_NONBLOCK .
-.P
-The
-.I mq_maxmsg
-and
-.I mq_msgsize
-fields are set when the message queue is created by
-.BR mq_open (3).
-The
-.I mq_maxmsg
-field is an upper limit on the number of messages
-that may be placed on the queue using
-.BR mq_send (3).
-The
-.I mq_msgsize
-field is an upper limit on the size of messages
-that may be placed on the queue.
-Both of these fields must have a value greater than zero.
-Two
-.I /proc
-files that place ceilings on the values for these fields are described in
-.BR mq_overview (7).
-.P
-The
-.I mq_curmsgs
-field returns the number of messages currently held in the queue.
-.P
-.BR mq_setattr ()
-sets message queue attributes using information supplied in the
-.I mq_attr
-structure pointed to by
-.IR newattr .
-The only attribute that can be modified is the setting of the
-.B O_NONBLOCK
-flag in
-.IR mq_flags .
-The other fields in
-.I newattr
-are ignored.
-If the
-.I oldattr
-field is not NULL,
-then the buffer that it points to is used to return an
-.I mq_attr
-structure that contains the same information that is returned by
-.BR mq_getattr ().
-.SH RETURN VALUE
-On success
-.BR mq_getattr ()
-and
-.BR mq_setattr ()
-return 0; on error, \-1 is returned, with
-.I errno
-set to indicate the error.
-.SH ERRORS
-.TP
-.B EBADF
-The message queue descriptor specified in
-.I mqdes
-is invalid.
-.TP
-.B EINVAL
-.I newattr\->mq_flags
-contained set bits other than
-.BR O_NONBLOCK .
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR mq_getattr (),
-.BR mq_setattr ()
-T}	Thread safety	MT-Safe
-.TE
-.SH VERSIONS
-On Linux,
-.BR mq_getattr ()
-and
-.BR mq_setattr ()
-are library functions layered on top of the
-.BR mq_getsetattr (2)
-system call.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001.
-.SH EXAMPLES
-The program below can be used to show the default
-.I mq_maxmsg
-and
-.I mq_msgsize
-values that are assigned to a message queue that is created with a call to
-.BR mq_open (3)
-in which the
-.I attr
-argument is NULL.
-Here is an example run of the program:
-.P
-.in +4n
-.EX
-$ \fB./a.out /testq\fP
-Maximum # of messages on queue:   10
-Maximum message size:             8192
-.EE
-.in
-.P
-Since Linux 3.5, the following
-.I /proc
-files (described in
-.BR mq_overview (7))
-can be used to control the defaults:
-.P
-.in +4n
-.EX
-$ \fBuname \-sr\fP
-Linux 3.8.0
-$ \fBcat /proc/sys/fs/mqueue/msg_default\fP
-10
-$ \fBcat /proc/sys/fs/mqueue/msgsize_default\fP
-8192
-.EE
-.in
-.SS Program source
-\&
-.\" SRC BEGIN (mq_getattr.c)
-.EX
-#include <fcntl.h>
-#include <mqueue.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <unistd.h>
-\&
-#define errExit(msg)    do { perror(msg); exit(EXIT_FAILURE); \e
-                        } while (0)
-\&
-int
-main(int argc, char *argv[])
-{
-    mqd_t mqd;
-    struct mq_attr attr;
-\&
-    if (argc != 2) {
-        fprintf(stderr, "Usage: %s mq\-name\en", argv[0]);
-        exit(EXIT_FAILURE);
-    }
-\&
-    mqd = mq_open(argv[1], O_CREAT | O_EXCL, 0600, NULL);
-    if (mqd == (mqd_t) \-1)
-        errExit("mq_open");
-\&
-    if (mq_getattr(mqd, &attr) == \-1)
-        errExit("mq_getattr");
-\&
-    printf("Maximum # of messages on queue:   %ld\en", attr.mq_maxmsg);
-    printf("Maximum message size:             %ld\en", attr.mq_msgsize);
-\&
-    if (mq_unlink(argv[1]) == \-1)
-        errExit("mq_unlink");
-\&
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR mq_close (3),
-.BR mq_notify (3),
-.BR mq_open (3),
-.BR mq_receive (3),
-.BR mq_send (3),
-.BR mq_unlink (3),
-.BR mq_overview (7)