gettimeofday

Implemented in Antinomie 0.7.0 · Syscall list

Synopsis

long gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);

Number (x86-64)	96
ABI	common
Kernel entry point	sys_gettimeofday

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

Description

Reads the wall-clock time, and optionally the obsolete timezone structure.

Arguments

Name	Type	Meaning
tv (arg0)	struct __kernel_old_timeval *	Pointer to a timeval structure.
tz (arg1)	struct timezone *	Pointer to a timezone structure (obsolete).

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.

Man page

gettimeofday(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
tv (arg0)	Entry	the pointer itself, as a raw word	args.0, args.raw[0]
↳ pointee	Exit	structure timeval (fixed size)	arg0.data	result is 0
tz (arg1)	Entry	the pointer itself, as a raw word	args.1, args.raw[1]
↳ pointee	Exit	structure timezone (fixed size)	arg1.data	result is 0

Filter fields

• Result: ret, syscall.errno, syscall.success, syscall.duration_ns.
• Argument words: args.tv (arg0), args.tz (arg1); args.0 to args.5 by position.
• Structure timeval[2] behind tv (arg0): args.tv.<member> for tv_sec, tv_usec.
• Structure timezone behind tz (arg1): args.tz.<member> for tz_dsttime, tz_minuteswest.

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.