diff options
Diffstat (limited to '')
| -rw-r--r-- | man3/mq_notify.3 | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/man3/mq_notify.3 b/man3/mq_notify.3 index bb0d514..591eb32 100644 --- a/man3/mq_notify.3 +++ b/man3/mq_notify.3 @@ -3,7 +3,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH mq_notify 3 2023-07-20 "Linux man-pages 6.05.01" +.TH mq_notify 3 2023-10-31 "Linux man-pages 6.7" .SH NAME mq_notify \- register for notification when a message is available .SH LIBRARY @@ -13,7 +13,7 @@ Real-time library .nf .B #include <mqueue.h> .BR "#include <signal.h> " "/* Definition of SIGEV_* constants */" -.PP +.P .BI "int mq_notify(mqd_t " mqdes ", const struct sigevent *" sevp ); .fi .SH DESCRIPTION @@ -22,15 +22,15 @@ allows the calling process to register or unregister for delivery of an asynchronous notification when a new message arrives on the empty message queue referred to by the message queue descriptor .IR mqdes . -.PP +.P The .I sevp argument is a pointer to a .I sigevent structure. For the definition and general details of this structure, see -.BR sigevent (7). -.PP +.BR sigevent (3type). +.P If .I sevp is a non-null pointer, then @@ -54,7 +54,7 @@ for notification, but when a message arrives, no notification is sent. Notify the process by sending the signal specified in .IR sigev_signo . See -.BR sigevent (7) +.BR sigevent (3type) for general details. The .I si_code @@ -75,26 +75,26 @@ Upon message delivery, invoke .I sigev_notify_function as if it were the start function of a new thread. See -.BR sigevent (7) +.BR sigevent (3type) for details. -.PP +.P Only one process can be registered to receive notification from a message queue. -.PP +.P If .I sevp is NULL, and the calling process is currently registered to receive notifications for this message queue, then the registration is removed; another process can then register to receive a message notification for this queue. -.PP +.P Message notification occurs only when a new message arrives and the queue was previously empty. If the queue was not empty at the time .BR mq_notify () was called, then a notification will occur only after the queue is emptied and a new message arrives. -.PP +.P If another process or thread is waiting to read a message from an empty queue using .BR mq_receive (3), @@ -102,7 +102,7 @@ then any message notification registration is ignored: the message is delivered to the process or thread calling .BR mq_receive (3), and the message notification registration remains in effect. -.PP +.P Notification occurs once: after a notification is delivered, the notification registration is removed, and another process can register for message notification. @@ -142,7 +142,7 @@ is not a valid signal number. .TP .B ENOMEM Insufficient memory. -.PP +.P POSIX.1-2008 says that an implementation .I may generate an @@ -167,7 +167,6 @@ T{ .BR mq_notify () T} Thread safety MT-Safe .TE -.sp 1 .SH VERSIONS .SS C library/kernel differences In the glibc implementation, the @@ -271,4 +270,4 @@ main(int argc, char *argv[]) .BR mq_send (3), .BR mq_unlink (3), .BR mq_overview (7), -.BR sigevent (7) +.BR sigevent (3type) |