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extern crate libudev_sys as udev;
extern crate libc;
use std::str;
use std::ffi::{CString,CStr};
use self::libc::{c_int,c_short,c_char};
#[cfg(target_os = "linux")]
#[allow(non_camel_case_types)]
type nfds_t = libc::c_ulong;
#[cfg(not(target_os = "linux"))]
#[allow(non_camel_case_types)]
type nfds_t = libc::c_uint;
#[repr(C)]
struct PollFd {
fd: c_int,
events: c_short,
revents: c_short
}
const POLLIN: c_short = 0x0001;
extern "C" {
fn poll(fds: *mut PollFd, nfds: nfds_t, timeout: c_int) -> c_int;
}
fn main() {
let netlink = CString::new("udev").unwrap();
unsafe {
let udev = udev::udev_new();
if !udev.is_null() {
let monitor = udev::udev_monitor_new_from_netlink(udev, netlink.as_ptr());
if !monitor.is_null() {
listen(monitor);
udev::udev_monitor_unref(monitor);
}
udev::udev_unref(udev);
}
}
}
unsafe fn listen(monitor: *mut udev::udev_monitor) {
udev::udev_monitor_ref(monitor);
udev::udev_monitor_enable_receiving(monitor);
let fd = udev::udev_monitor_get_fd(monitor);
let mut fds = vec!(PollFd { fd: fd, events: POLLIN, revents: 0 });
while poll((&mut fds[..]).as_mut_ptr(), fds.len() as nfds_t, -1) > 0 {
if fds[0].revents & POLLIN != 0 {
let device = udev::udev_monitor_receive_device(monitor);
print_device(device);
udev::udev_device_unref(device);
}
}
udev::udev_monitor_unref(monitor);
}
unsafe fn print_device(device: *mut udev::udev_device) {
let seqnum = udev::udev_device_get_seqnum(device);
let action = unwrap_cstr(udev::udev_device_get_action(device));
let devpath = unwrap_cstr(udev::udev_device_get_devpath(device));
let initialized = udev::udev_device_get_is_initialized(device) != 0;
let since = udev::udev_device_get_usec_since_initialized(device);
println!("{}: [{}] {} (intialized={} usec={})", seqnum, action, devpath, initialized, since);
}
unsafe fn unwrap_cstr<'a>(ptr: *const c_char) -> &'a str {
if ptr.is_null() {
""
}
else {
str::from_utf8(CStr::from_ptr(ptr).to_bytes()).unwrap_or("")
}
}
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