linkat
Implemented in Antinomie 0.7.0 · Syscall list
Synopsis
Section titled “Synopsis”long linkat(int olddfd, const char *oldname, int newdfd, const char *newname, int flags);| Number (x86-64) | 265 |
| ABI | common |
| Kernel entry point | sys_linkat |
This is the raw kernel prototype from the pinned Linux 6.12.94 schema, not the libc wrapper.
Description
Section titled “Description”Creates a hard link, with both paths relative to directory descriptors.
Arguments
Section titled “Arguments”| Name | Type | Meaning |
|---|---|---|
olddfd (arg0) |
int |
Directory descriptor for the old path. |
oldname (arg1) |
const char * |
Existing path. |
newdfd (arg2) |
int |
Directory descriptor for the new path. |
newname (arg3) |
const char * |
New path. |
flags (arg4) |
int |
Option flags that change the behavior of the call. |
Return value
Section titled “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
Section titled “Common errors”| Raw return | Name | Meaning |
|---|---|---|
-17 |
EEXIST |
The object already exists. |
-2 |
ENOENT |
A path component or the named object does not exist. |
-18 |
EXDEV |
The operation would cross filesystems. |
Man page
Section titled “Man page”Captured by Antinomie
Section titled “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
Section titled “Arguments”| Argument | When | How | Recorded field key | Condition |
|---|---|---|---|---|
olddfd (arg0) |
Entry | raw scalar word | args.0, args.olddfd |
|
oldname (arg1) |
Entry | the pointer itself, as a raw word | args.1, args.raw[1] |
|
| ↳ pointee | Entry | NUL-terminated string, up to 4,096 bytes (PATH_MAX) | arg1.path |
always |
newdfd (arg2) |
Entry | raw scalar word | args.2, args.newdfd |
|
newname (arg3) |
Entry | the pointer itself, as a raw word | args.3, args.raw[3] |
|
| ↳ pointee | Entry | NUL-terminated string, up to 4,096 bytes (PATH_MAX) | arg3.path |
always |
flags (arg4) |
Entry | raw scalar word; Syscall Trace also decodes it into flag names (linkat group), listing unknown bits separately |
args.4, args.flags |
Derived and lifecycle records
Section titled “Derived and lifecycle records”- A
lifecycle.file_idrecord (kind Link) identifies the inode that got the new name. Written by a base built for Antinomie 0.7.0 or later.
Filter fields
Section titled “Filter fields”- Result:
ret,syscall.errno,syscall.success,syscall.duration_ns. - Argument words:
args.olddfd(arg0),args.oldname(arg1),args.newdfd(arg2),args.newname(arg3),args.flags(arg4);args.0toargs.5by position. - Captured strings: the
args.<name>field of a path argument, andargs.path, give the captured text instead of the pointer.
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.