File: usdt.bt

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#!/usr/bin/env bpftrace

// To run, do `sudo bpftrace usdt.bt`

usdt:../build/lib/libfuse3.so:libfuse:request_receive
{
    printf("libfuse:request_receive hit, err=%d\n", arg0);
}

usdt:../build/lib/libfuse3.so:libfuse:request_process
{
    printf("libfuse:request_process hit, opcode=%u, unique=%u\n", arg0, arg1);
}

usdt:../build/lib/libfuse3.so:libfuse:request_reply
{
    printf("libfuse:request_reply hit, unique=%lu, len=%u, err=%u, reply_err=%d\n",
	    arg0, arg1, arg2, arg3);
}