mq_notify

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long mq_notify(mqd_t mqdes, const struct sigevent *notification);

Number (x86-64)	244
ABI	64
Kernel entry point	sys_mq_notify

This is the raw kernel prototype from the pinned Linux 6.12.94 schema, not the libc wrapper.

Description

Registers to be notified when a message arrives in an empty POSIX message queue.

Arguments

Name	Type	Meaning
mqdes (arg0)	mqd_t	Message queue descriptor.
notification (arg1)	const struct sigevent *	Pointer to a sigevent describing the notification.

Return value

On success: 0.

In an Antinomie trace the Return column and the ret filter field show the raw kernel return value. On failure that is the negative errno, for example -2 for ENOENT, not the -1 plus errno that the libc wrapper gives. syscall.errno holds the positive errno and syscall.success is false.

Common errors

Raw return	Name	Meaning
-16	EBUSY	The resource is busy.
-22	EINVAL	An argument is invalid.

Man page

mq_notify(2) on man7.org

Captured by Antinomie

Coverage mark: Implemented. Every pointer argument has a capture rule in the pinned kernel patch and none of them records a “no decoder”, “address only” or “not observed” gap on any code path. Individual values can still be incomplete on a particular call; see the capture statuses.

Every call is recorded as an Entry record (the six argument words and the pointees copied at entry) and an Exit record (the return value and the pointees copied at exit).

Arguments

Argument	When	How	Recorded field key	Condition
mqdes (arg0)	Entry	raw scalar word	args.0, args.mqdes
notification (arg1)	Entry	the pointer itself, as a raw word	args.1, args.raw[1]
↳ pointee	Entry	structure sigevent	arg1.notification	the pointer is not NULL
↳ pointee	Entry	the 32-byte notification cookie	arg1.notification.cookie	sigev_notify is SIGEV_THREAD

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.mqdes (arg0), args.notification (arg1); args.0 to args.5 by position.
• Structure sigevent behind notification (arg1): args.notification.<member> for sigev_notify, sigev_signo.

See Syscall Trace filter for the full syntax.

For what the capture statuses mean, see Capture statuses. For what is never recorded, see Known gaps.