mincore

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long mincore(unsigned long start, size_t len, unsigned char *vec);

Number (x86-64)	27
ABI	common
Kernel entry point	sys_mincore

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

Description

Reports which pages of a range are currently resident in memory, one byte per page.

Arguments

Name	Type	Meaning
start (arg0)	unsigned long	Start address of a memory range.
len (arg1)	size_t	Length in bytes.
vec (arg2)	unsigned char *	Pointer to an array of iovec structures.

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
-14	EFAULT	A pointer argument points outside the accessible address space.
-22	EINVAL	An argument is invalid.
-12	ENOMEM	The kernel is out of memory.

Man page

mincore(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
start (arg0)	Entry	raw scalar word	args.0, args.start
len (arg1)	Entry	raw scalar word	args.1, args.len
vec (arg2)	Entry	the pointer itself, as a raw word	args.2, args.raw[2]
↳ pointee	Exit	one byte per page, number of pages from len (arg1) rounded up	arg2.residency	result is 0

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.start (arg0), args.len (arg1), args.vec (arg2); 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.