io_uring_setup
Implemented in Antinomie 0.7.0 · Syscall list
Synopsis
Section titled “Synopsis”long io_uring_setup(u32 entries, struct io_uring_params *p);| Number (x86-64) | 425 |
| ABI | common |
| Kernel entry point | sys_io_uring_setup |
This is the raw kernel prototype from the pinned Linux 6.12.94 schema, not the libc wrapper.
Description
Section titled “Description”Creates an io_uring instance with submission and completion rings and returns its descriptor.
Arguments
Section titled “Arguments”| Name | Type | Meaning |
|---|---|---|
entries (arg0) |
u32 |
Requested number of submission queue entries. |
p (arg1) |
struct io_uring_params * |
Pointer to parameters. |
Return value
Section titled “Return value”On success: A new file descriptor (a non-negative number).
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 |
|---|---|---|
-22 |
EINVAL |
An argument is invalid. |
-12 |
ENOMEM |
The kernel is out of memory. |
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 |
|---|---|---|---|---|
entries (arg0) |
Entry | raw scalar word | args.0, args.entries |
|
p (arg1) |
Entry | the pointer itself, as a raw word | args.1, args.raw[1] |
|
| ↳ pointee | Entry and exit | structure io_uring_params as the program passed it, and again as the kernel filled it |
arg1.params |
at exit only when result is 0 or greater |
| ↳ pointee | Exit | the ring and submission-entry memory the program supplied | arg1.user_rings, arg1.user_sqes |
the ring was created with IORING_SETUP_NO_MMAP |
Filter fields
Section titled “Filter fields”- Result:
ret,syscall.errno,syscall.success,syscall.duration_ns. - Argument words:
args.entries(arg0),args.p(arg1);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.