get_robust_list
Implemented in Antinomie 0.7.0 · Syscall list
Synopsis
Section titled “Synopsis”long get_robust_list(int pid, struct robust_list_head **head_ptr, size_t *len_ptr);| Number (x86-64) | 274 |
| ABI | 64 |
| Kernel entry point | sys_get_robust_list |
This is the raw kernel prototype from the pinned Linux 6.12.94 schema, not the libc wrapper.
Description
Section titled “Description”Reads the robust futex list head of a thread.
Arguments
Section titled “Arguments”| Name | Type | Meaning |
|---|---|---|
pid (arg0) |
int |
Process or thread id. |
head_ptr (arg1) |
struct robust_list_head ** |
Where to store the robust list head pointer. |
len_ptr (arg2) |
size_t * |
Where to store its size. |
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 |
|---|---|---|
-14 |
EFAULT |
A pointer argument points outside the accessible address space. |
-1 |
EPERM |
The operation is not permitted for this process. |
-3 |
ESRCH |
No such process or thread. |
Man page
Section titled “Man page”get_robust_list(2) on man7.org
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 |
|---|---|---|---|---|
pid (arg0) |
Entry | raw scalar word | args.0, args.pid |
|
head_ptr (arg1) |
Entry | the pointer itself, as a raw word | args.1, args.raw[1] |
|
| ↳ pointee | Exit | structure robust_list_head_pointer (fixed size) |
arg1.data |
result is 0 |
len_ptr (arg2) |
Entry | the pointer itself, as a raw word | args.2, args.raw[2] |
|
| ↳ pointee | Exit | structure size_t (fixed size) |
arg2.data |
result is 0 |
Filter fields
Section titled “Filter fields”- Result:
ret,syscall.errno,syscall.success,syscall.duration_ns. - Argument words:
args.pid(arg0),args.head_ptr(arg1),args.len_ptr(arg2);args.0toargs.5by position. - Structure
robust_list_head_pointerbehindhead_ptr(arg1):args.head_ptr.<member>forvalue. - Structure
size_tbehindlen_ptr(arg2):args.len_ptr.<member>forvalue.
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.