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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| typedef unsigned int uint32_t; | ||
| typedef unsigned long int uint64_t; | ||
| #include <sys/epoll.h> |
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java-does-usb/src/main/java/net/codecrete/usb/linux/EPoll.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,98 @@ | ||
| // | ||
| // Java Does USB | ||
| // Copyright (c) 2022 Manuel Bleichenbacher | ||
| // Licensed under MIT License | ||
| // https://opensource.org/licenses/MIT | ||
| // | ||
|
|
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| package net.codecrete.usb.linux; | ||
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| import net.codecrete.usb.linux.gen.epoll.epoll_event; | ||
| import net.codecrete.usb.linux.gen.errno.errno; | ||
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|
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| import java.lang.foreign.*; | ||
| import java.lang.invoke.MethodHandle; | ||
| import java.lang.invoke.VarHandle; | ||
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| import static java.lang.foreign.ValueLayout.ADDRESS; | ||
| import static java.lang.foreign.ValueLayout.JAVA_INT; | ||
| import static net.codecrete.usb.linux.Linux.allocateErrorState; | ||
| import static net.codecrete.usb.linux.LinuxUsbException.throwLastError; | ||
| import static net.codecrete.usb.linux.gen.epoll.epoll.*; | ||
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| @SuppressWarnings({"OptionalGetWithoutIsPresent", "SameParameterValue", "java:S100"}) | ||
| public class EPoll { | ||
| private EPoll() {} | ||
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| private static final Linker linker = Linker.nativeLinker(); | ||
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| private static final FunctionDescriptor epoll_create$FUNC = FunctionDescriptor.of(JAVA_INT, JAVA_INT); | ||
| private static final MethodHandle epoll_create$MH = linker.downcallHandle(linker.defaultLookup().find( | ||
| "epoll_create").get(), epoll_create$FUNC, Linux.ERRNO_STATE); | ||
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| private static final FunctionDescriptor epoll_ctl$FUNC = FunctionDescriptor.of(JAVA_INT, JAVA_INT, JAVA_INT, JAVA_INT, ADDRESS); | ||
| private static final MethodHandle epoll_ctl$MH = linker.downcallHandle(linker.defaultLookup().find( | ||
| "epoll_ctl").get(), epoll_ctl$FUNC, Linux.ERRNO_STATE); | ||
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| private static final FunctionDescriptor epoll_wait$FUNC = FunctionDescriptor.of(JAVA_INT, JAVA_INT, ADDRESS, JAVA_INT, JAVA_INT); | ||
| private static final MethodHandle epoll_wait$MH = linker.downcallHandle(linker.defaultLookup().find( | ||
| "epoll_wait").get(), epoll_wait$FUNC, Linux.ERRNO_STATE); | ||
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| private static final VarHandle epoll_event_data_fd$VH = epoll_event.$LAYOUT().varHandle( | ||
| MemoryLayout.PathElement.groupElement("data"), | ||
| MemoryLayout.PathElement.groupElement("fd") | ||
| ); | ||
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| static int epoll_create(int size, MemorySegment errno) { | ||
| try { | ||
| return (int) epoll_create$MH.invokeExact(errno, size); | ||
| } catch (Throwable ex) { | ||
| throw new AssertionError(ex); | ||
| } | ||
| } | ||
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| private static int epoll_ctl(int epfd, int op, int fd, MemorySegment event, MemorySegment errno) { | ||
| try { | ||
| return (int) epoll_ctl$MH.invokeExact(errno, epfd, op, fd, event); | ||
| } catch (Throwable ex) { | ||
| throw new AssertionError(ex); | ||
| } | ||
| } | ||
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| static int epoll_wait(int epfd, MemorySegment events, int maxevent, int timeout, MemorySegment errno) { | ||
| try { | ||
| return (int) epoll_wait$MH.invokeExact(errno, epfd, events, maxevent, timeout); | ||
| } catch (Throwable ex) { | ||
| throw new AssertionError(ex); | ||
| } | ||
| } | ||
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| static void addFileDescriptor(int epfd, int op, int fd) { | ||
| try (var arena = Arena.ofConfined()) { | ||
| var errorState = allocateErrorState(arena); | ||
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| var event = arena.allocate(epoll_event.$LAYOUT()); | ||
| epoll_event.events$set(event, op); | ||
| epoll_event_data_fd$VH.set(event, fd); | ||
| var ret = epoll_ctl(epfd, EPOLL_CTL_ADD(), fd, event, errorState); | ||
| if (ret < 0) | ||
| throwLastError(errorState, "internal error (epoll_ctl_add)"); | ||
| } | ||
| } | ||
|
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| static void removeFileDescriptor(int epfd, int fd) { | ||
| try (var arena = Arena.ofConfined()) { | ||
| var errorState = allocateErrorState(arena); | ||
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| var event = arena.allocate(epoll_event.$LAYOUT()); | ||
| epoll_event.events$set(event, 0); | ||
| epoll_event_data_fd$VH.set(event, fd); | ||
| var ret = epoll_ctl(epfd, EPOLL_CTL_DEL(), fd, event, errorState); | ||
| if (ret < 0) { | ||
| var err = Linux.getErrno(errorState); | ||
| if (err != errno.ENOENT()) | ||
| throwLastError(errorState, "internal error (epoll_ctl_del)"); | ||
| } | ||
| } | ||
| } | ||
| } |
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