perf-event-open 0.4.4

Full-featured high-level wrapper for the perf_event_open system call.
Documentation 
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use std::sync::LazyLock;

pub mod bindings;
pub mod syscall;

// Dereferences the pointer and offsets by the size of the
// pointee type, then returns the dereferenced value.
#[inline]
pub unsafe fn deref_offset<T: Copy>(ptr: &mut *const u8) -> T {
    let val = *(*ptr as *const T);
    *ptr = ptr.add(size_of::<T>());
    val
}

pub static PAGE_SIZE: LazyLock<usize> = LazyLock::new(|| {
    let name = libc::_SC_PAGE_SIZE;
    let size = unsafe { libc::sysconf(name) };
    size as _
});

pub type Attr = bindings::perf_event_attr;
pub type Metadata = bindings::perf_event_mmap_page;