shmdt

Partial in Antinomie 0.7.0 · Syscall list

Synopsis

long shmdt(char *shmaddr);

Number (x86-64)	67
ABI	common
Kernel entry point	sys_shmdt

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

Description

Detaches a System V shared memory segment from the address space.

Arguments

Name	Type	Meaning
shmaddr (arg0)	char *	Address at which to attach the segment, or 0.

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
-22	EINVAL	An argument is invalid.

Man page

shmdt(2) on man7.org

Captured by Antinomie

Coverage mark: Partial. The detach address (shmaddr) is recorded as a bare address with the “address only” status.

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
shmaddr (arg0)	Entry	the pointer itself, as a raw word	args.0, args.raw[0]
↳ pointee	Entry	the address, 0 bytes, status “address only”	shm.mapping_address	always

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.shmaddr (arg0); args.0 to args.5 by position.

See Syscall Trace filter for the full syntax.

Known gaps

• See the coverage mark above for the code paths that record a gap.

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