unshare

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long unshare(unsigned long unshare_flags);

Number (x86-64)	272
ABI	common
Kernel entry point	sys_unshare

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

Description

Detaches parts of the process’s execution context, such as namespaces or the file descriptor table, from those shared with others.

Arguments

Name	Type	Meaning
unshare_flags (arg0)	unsigned long	Namespace and context flags to unshare.

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.
-1	EPERM	The operation is not permitted for this process.

Man page

unshare(2) on man7.org

Captured by Antinomie

Coverage mark: Implemented. All arguments are plain values, recorded as the raw argument words at entry. There is no pointee to copy and no known gap.

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
unshare_flags (arg0)	Entry	raw scalar word; Syscall Trace also decodes it into flag names (clone_flags group), listing unknown bits separately	args.0, args.unshare_flags

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.unshare_flags (arg0); 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.