ustat

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long ustat(unsigned int dev, struct ustat *ubuf);

Number (x86-64)	136
ABI	common
Kernel entry point	sys_ustat

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

Description

Reads filesystem statistics by device number. It is obsolete; statfs replaces it.

Arguments

Name	Type	Meaning
dev (arg0)	unsigned int	Device number.
ubuf (arg1)	struct ustat *	Pointer to a data buffer.

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

ustat(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
dev (arg0)	Entry	raw scalar word	args.0, args.dev
ubuf (arg1)	Entry	the pointer itself, as a raw word	args.1, args.raw[1]
↳ pointee	Exit	structure ustat (fixed size)	arg1.data	result is 0

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.dev (arg0), args.ubuf (arg1); args.0 to args.5 by position.
• Structure ustat behind ubuf (arg1): args.ubuf.<member> for f_fname, f_fpack, f_tfree, f_tinode.

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.