setfsuid

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long setfsuid(uid_t uid);

Number (x86-64)	122
ABI	common
Kernel entry point	sys_setfsuid

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

Description

Sets the user id used for filesystem permission checks.

Arguments

Name	Type	Meaning
uid (arg0)	uid_t	User id.

Return value

On success: the previous filesystem user id.

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.

Man page

setfsuid(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
uid (arg0)	Entry	raw scalar word	args.0, args.uid

Derived and lifecycle records

• When the call changes the task’s credentials, a lifecycle.creds record gives the ids (in the initial user namespace), the capability sets and the securebits after the change. Written by a base built for Antinomie 0.7.0 or later.

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.uid (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.