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openFileDescriptors() — netty Function Reference

Architecture documentation for the openFileDescriptors() function in EpollIoHandler.java from the netty codebase.

Function java Buffer Search calls 1 called by 1

Entity Profile

Dependency Diagram

graph TD
  971d9f3b_e81e_dc5f_753e_454755fc5aec["openFileDescriptors()"]
  e531fecb_b495_8b97_8d1b_49ff2b5ccdbb["EpollIoHandler"]
  971d9f3b_e81e_dc5f_753e_454755fc5aec -->|defined in| e531fecb_b495_8b97_8d1b_49ff2b5ccdbb
  40c77ccb_a5b7_aed0_8603_28bc38d7dc1d["EpollIoHandler()"]
  40c77ccb_a5b7_aed0_8603_28bc38d7dc1d -->|calls| 971d9f3b_e81e_dc5f_753e_454755fc5aec
  cf0e10de_7ce5_c698_1c75_d701a03a88b4["closeFileDescriptor()"]
  971d9f3b_e81e_dc5f_753e_454755fc5aec -->|calls| cf0e10de_7ce5_c698_1c75_d701a03a88b4
  style 971d9f3b_e81e_dc5f_753e_454755fc5aec fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

transport-classes-epoll/src/main/java/io/netty/channel/epoll/EpollIoHandler.java lines 158–190

    @UnstableApi
    public void openFileDescriptors() {
        boolean success = false;
        FileDescriptor epollFd = null;
        FileDescriptor eventFd = null;
        FileDescriptor timerFd = null;
        try {
            this.epollFd = epollFd = Native.newEpollCreate();
            this.eventFd = eventFd = Native.newEventFd();
            try {
                // It is important to use EPOLLET here as we only want to get the notification once per
                // wakeup and don't call eventfd_read(...).
                Native.epollCtlAdd(epollFd.intValue(), eventFd.intValue(), Native.EPOLLIN | Native.EPOLLET);
            } catch (IOException e) {
                throw new IllegalStateException("Unable to add eventFd filedescriptor to epoll", e);
            }
            this.timerFd = timerFd = Native.newTimerFd();
            try {
                // It is important to use EPOLLET here as we only want to get the notification once per
                // wakeup and don't call read(...).
                Native.epollCtlAdd(epollFd.intValue(), timerFd.intValue(), Native.EPOLLIN | Native.EPOLLET);
            } catch (IOException e) {
                throw new IllegalStateException("Unable to add timerFd filedescriptor to epoll", e);
            }
            success = true;
        } finally {
            if (!success) {
                closeFileDescriptor(epollFd);
                closeFileDescriptor(eventFd);
                closeFileDescriptor(timerFd);
            }
        }
    }

Domain

Subdomains

Defined In

Calls

Called By

Source

Frequently Asked Questions

What does openFileDescriptors() do?
openFileDescriptors() is a function in the netty codebase, defined in transport-classes-epoll/src/main/java/io/netty/channel/epoll/EpollIoHandler.java.
Where is openFileDescriptors() defined?
openFileDescriptors() is defined in transport-classes-epoll/src/main/java/io/netty/channel/epoll/EpollIoHandler.java at line 158.
What does openFileDescriptors() call?
openFileDescriptors() calls 1 function(s): closeFileDescriptor.
What calls openFileDescriptors()?
openFileDescriptors() is called by 1 function(s): EpollIoHandler.

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