Sebastian
93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
#pragma once
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#include <libremidi/backends/linux/dylib_loader.hpp>
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#include <libremidi/backends/linux/helpers.hpp>
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#include <libudev.h>
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#include <cassert>
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namespace libremidi
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{
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struct libudev
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{
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// Useful one-liner:
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// nm -A * | grep ' udev_' | grep -v '@' | cut -f 2 -d 'U' | sort | uniq | sed 's/ udev_//'| awk ' { print "LIBREMIDI_SYMBOL_DEF(udev, "$1");" }'
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explicit libudev()
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: library{"libudev.so.1"}
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{
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if (!library)
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{
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available = false;
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return;
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}
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LIBREMIDI_SYMBOL_INIT(udev, device_get_action);
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LIBREMIDI_SYMBOL_INIT(udev, device_get_subsystem);
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LIBREMIDI_SYMBOL_INIT(udev, device_unref);
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LIBREMIDI_SYMBOL_INIT(udev, monitor_enable_receiving);
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LIBREMIDI_SYMBOL_INIT(udev, monitor_get_fd);
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LIBREMIDI_SYMBOL_INIT(udev, monitor_new_from_netlink);
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LIBREMIDI_SYMBOL_INIT(udev, monitor_receive_device);
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LIBREMIDI_SYMBOL_INIT(udev, monitor_unref);
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LIBREMIDI_SYMBOL_INIT2(udev, new, create);
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LIBREMIDI_SYMBOL_INIT(udev, unref);
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}
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static const libudev& instance()
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{
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static const libudev self;
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return self;
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}
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dylib_loader library;
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bool available{true};
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LIBREMIDI_SYMBOL_DEF(udev, device_get_action);
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LIBREMIDI_SYMBOL_DEF(udev, device_get_subsystem);
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LIBREMIDI_SYMBOL_DEF(udev, device_unref);
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LIBREMIDI_SYMBOL_DEF(udev, monitor_enable_receiving);
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LIBREMIDI_SYMBOL_DEF(udev, monitor_get_fd);
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LIBREMIDI_SYMBOL_DEF(udev, monitor_new_from_netlink);
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LIBREMIDI_SYMBOL_DEF(udev, monitor_receive_device);
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LIBREMIDI_SYMBOL_DEF(udev, monitor_unref);
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LIBREMIDI_SYMBOL_DEF2(udev, new, create);
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LIBREMIDI_SYMBOL_DEF(udev, unref);
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};
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struct udev_helper
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{
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udev_helper()
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{
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instance = udev.create();
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assert(instance);
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monitor = udev.monitor_new_from_netlink(instance, "udev");
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assert(monitor);
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udev.monitor_enable_receiving(monitor);
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}
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~udev_helper()
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{
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udev.monitor_unref(monitor);
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udev.unref(instance);
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}
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udev_helper(const udev_helper&) = delete;
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udev_helper(udev_helper&&) = delete;
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udev_helper& operator=(const udev_helper&) = delete;
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udev_helper& operator=(udev_helper&&) = delete;
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operator pollfd() const noexcept
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{
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return {.fd = udev.monitor_get_fd(monitor), .events = POLLIN, .revents = 0};
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}
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const libudev& udev = libudev::instance();
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struct udev* instance{};
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udev_monitor* monitor{};
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};
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}
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