Probing supported capabilities

The following program demonstrates how to use io_uring_get_probe(). It prints if an operation is supported or not.

A program to print details about supported and unsupported operations

#include <stdio.h>
#include <stdlib.h>
#include <sys/utsname.h>
#include <liburing.h>
#include <liburing/io_uring.h>

static const char *op_strs[] = {
        "IORING_OP_NOP",
        "IORING_OP_READV",
        "IORING_OP_WRITEV",
        "IORING_OP_FSYNC",
        "IORING_OP_READ_FIXED",
        "IORING_OP_WRITE_FIXED",
        "IORING_OP_POLL_ADD",
        "IORING_OP_POLL_REMOVE",
        "IORING_OP_SYNC_FILE_RANGE",
        "IORING_OP_SENDMSG",
        "IORING_OP_RECVMSG",
        "IORING_OP_TIMEOUT",
        "IORING_OP_TIMEOUT_REMOVE",
        "IORING_OP_ACCEPT",
        "IORING_OP_ASYNC_CANCEL",
        "IORING_OP_LINK_TIMEOUT",
        "IORING_OP_CONNECT",
        "IORING_OP_FALLOCATE",
        "IORING_OP_OPENAT",
        "IORING_OP_CLOSE",
        "IORING_OP_FILES_UPDATE",
        "IORING_OP_STATX",
        "IORING_OP_READ",
        "IORING_OP_WRITE",
        "IORING_OP_FADVISE",
        "IORING_OP_MADVISE",
        "IORING_OP_SEND",
        "IORING_OP_RECV",
        "IORING_OP_OPENAT2",
        "IORING_OP_EPOLL_CTL",
        "IORING_OP_SPLICE",
        "IORING_OP_PROVIDE_BUFFERS",
        "IORING_OP_REMOVE_BUFFERS",
};

int main() {
    struct utsname u;
    uname(&u);
    printf("You are running kernel version: %s\n", u.release);
    struct io_uring_probe *probe = io_uring_get_probe();
    printf("Report of your kernel's list of supported io_uring operations:\n");
    for (char i = 0; i < IORING_OP_LAST; i++ ) {
        printf("%s: ", op_strs[i]);
        if(io_uring_opcode_supported(probe, i))
            printf("yes.\n");
        else
            printf("no.\n");

    }
    free(probe);
    return 0;
}

Here is the output from the above program as run on Linux kernel 5.6.4

You are running kernel version: 5.6.4-arch1-1
Report of your kernel's list of supported io_uring operations:
IORING_OP_NOP: yes.
IORING_OP_READV: yes.
IORING_OP_WRITEV: yes.
IORING_OP_FSYNC: yes.
IORING_OP_READ_FIXED: yes.
IORING_OP_WRITE_FIXED: yes.
IORING_OP_POLL_ADD: yes.
IORING_OP_POLL_REMOVE: yes.
IORING_OP_SYNC_FILE_RANGE: yes.
IORING_OP_SENDMSG: yes.
IORING_OP_RECVMSG: yes.
IORING_OP_TIMEOUT: yes.
IORING_OP_TIMEOUT_REMOVE: yes.
IORING_OP_ACCEPT: yes.
IORING_OP_ASYNC_CANCEL: yes.
IORING_OP_LINK_TIMEOUT: yes.
IORING_OP_CONNECT: yes.
IORING_OP_FALLOCATE: yes.
IORING_OP_OPENAT: yes.
IORING_OP_CLOSE: yes.
IORING_OP_FILES_UPDATE: yes.
IORING_OP_STATX: yes.
IORING_OP_READ: yes.
IORING_OP_WRITE: yes.
IORING_OP_FADVISE: yes.
IORING_OP_MADVISE: yes.
IORING_OP_SEND: yes.
IORING_OP_RECV: yes.
IORING_OP_OPENAT2: yes.
IORING_OP_EPOLL_CTL: yes.
IORING_OP_SPLICE: no.
IORING_OP_PROVIDE_BUFFERS: no.
IORING_OP_REMOVE_BUFFERS: no.

Source code

Source code for this and other examples is available on Github.