statmount

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long statmount(const struct mnt_id_req *req, struct statmount *buf, size_t bufsize, unsigned int flags);

Number (x86-64)	457
ABI	common
Kernel entry point	sys_statmount

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

Description

Reads information about a mount, selected by its unique mount id, into a buffer.

Arguments

Name	Type	Meaning
req (arg0)	const struct mnt_id_req *	Pointer to a request structure.
buf (arg1)	struct statmount *	Pointer to a data buffer.
bufsize (arg2)	size_t	Size of the buffer in bytes.
flags (arg3)	unsigned int	Option flags that change the behavior of the call.

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
-2	ENOENT	A path component or the named object does not exist.
-75	EOVERFLOW	A value does not fit in the result type.

Man page

statmount(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
req (arg0)	Entry	the pointer itself, as a raw word	args.0, args.raw[0]
↳ pointee	Entry	structure mnt_id_req, versioned by its size field	arg0.mount_request	always
buf (arg1)	Entry	the pointer itself, as a raw word	args.1, args.raw[1]
↳ pointee	Exit	structure statmount plus its strings, length from its size word	arg1.statmount	result is 0 or greater
bufsize (arg2)	Entry	raw scalar word	args.2, args.bufsize
flags (arg3)	Entry	raw scalar word; Syscall Trace also decodes it into flag names (unknown group), listing unknown bits separately	args.3, args.flags

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.req (arg0), args.buf (arg1), args.bufsize (arg2), args.flags (arg3); args.0 to args.5 by position.
• Structure mnt_id_req behind req (arg0): args.req.<member> for mnt_id, mnt_ns_fd, mnt_ns_id, param, size.
• Structure statmount behind buf (arg1): args.buf.<member> for __spare2[0], __spare2[10], __spare2[11], __spare2[12], __spare2[13], __spare2[14], __spare2[15], __spare2[16], __spare2[17], __spare2[18], __spare2[19], __spare2[1], __spare2[20], __spare2[21], __spare2[22], __spare2[23], __spare2[24], __spare2[25], __spare2[26], __spare2[27], __spare2[28], __spare2[29], __spare2[2], __spare2[30], __spare2[31], __spare2[32], __spare2[33], __spare2[34], __spare2[35], __spare2[36], __spare2[37], __spare2[38], __spare2[39], __spare2[3], __spare2[40], __spare2[41], __spare2[42], __spare2[43], __spare2[44], __spare2[45], __spare2[46], __spare2[47], __spare2[48], __spare2[4], __spare2[5], __spare2[6], __spare2[7], __spare2[8], and 21 more.

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.