kcmp
Implemented in Antinomie 0.7.0 · Syscall list
Synopsis
Section titled “Synopsis”long kcmp(pid_t pid1, pid_t pid2, int type, unsigned long idx1, unsigned long idx2);| Number (x86-64) | 312 |
| ABI | common |
| Kernel entry point | sys_kcmp |
This is the raw kernel prototype from the pinned Linux 6.12.94 schema, not the libc wrapper.
Description
Section titled “Description”Compares kernel resources, such as a file or the address space, of two processes.
Arguments
Section titled “Arguments”| Name | Type | Meaning |
|---|---|---|
pid1 (arg0) |
pid_t |
First process id. |
pid2 (arg1) |
pid_t |
Second process id. |
type (arg2) |
int |
Type selector (socket type, key type or similar). |
idx1 (arg3) |
unsigned long |
First index. |
idx2 (arg4) |
unsigned long |
Second index. |
Return value
Section titled “Return value”On success: a comparison result.
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 |
|---|---|---|
-1 |
EPERM |
The operation is not permitted for this process. |
-3 |
ESRCH |
No such process or thread. |
Man page
Section titled “Man page”Captured by Antinomie
Section titled “Captured by Antinomie”Coverage mark: Implemented. All arguments are plain values, recorded as the raw argument words at entry. There is no pointee to copy and no known gap.
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 |
|---|---|---|---|---|
pid1 (arg0) |
Entry | raw scalar word | args.0, args.pid1 |
|
pid2 (arg1) |
Entry | raw scalar word | args.1, args.pid2 |
|
type (arg2) |
Entry | raw scalar word | args.2, args.type |
|
idx1 (arg3) |
Entry | raw scalar word | args.3, args.idx1 |
|
idx2 (arg4) |
Entry | raw scalar word | args.4, args.idx2 |
Filter fields
Section titled “Filter fields”- Result:
ret,syscall.errno,syscall.success,syscall.duration_ns. - Argument words:
args.pid1(arg0),args.pid2(arg1),args.type(arg2),args.idx1(arg3),args.idx2(arg4);args.0toargs.5by 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.