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