rt_sigprocmask

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long rt_sigprocmask(int how, sigset_t *set, sigset_t *oset, size_t sigsetsize);

Number (x86-64)	14
ABI	common
Kernel entry point	sys_rt_sigprocmask

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

Description

Changes or reads the set of signals blocked for the calling thread.

Arguments

Name	Type	Meaning
how (arg0)	int	Pointer to a structure, or a value, that says how to perform the operation.
set (arg1)	sigset_t *	Pointer to a signal set.
oset (arg2)	sigset_t *	Pointer to a buffer for the old signal set.
sigsetsize (arg3)	size_t	Size in bytes of the signal set; must be sizeof(sigset_t), 8.

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
-14	EFAULT	A pointer argument points outside the accessible address space.
-22	EINVAL	An argument is invalid.

Man page

sigprocmask(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
how (arg0)	Entry	raw scalar word	args.0, args.how
set (arg1)	Entry	the pointer itself, as a raw word	args.1, args.raw[1]
↳ pointee	Entry	signal set (sigset_t, 8 bytes)	signal.mask	the new set pointer is not NULL
oset (arg2)	Entry	the pointer itself, as a raw word	args.2, args.raw[2]
↳ pointee	Exit	signal set (sigset_t, 8 bytes), the old mask	signal.mask	result is 0 and the old set pointer is not NULL
sigsetsize (arg3)	Entry	raw scalar word	args.3, args.sigsetsize

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.how (arg0), args.set (arg1), args.oset (arg2), args.sigsetsize (arg3); args.0 to args.5 by position.

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.