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02/02/2024 06:09:55 PM
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dir.go
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dir_darwin.go
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dir_plan9.go
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dir_unix.go
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dir_windows.go
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dirent_aix.go
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dirent_dragonfly.go
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dirent_freebsd.go
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dirent_js.go
678 bytes
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dirent_linux.go
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dirent_netbsd.go
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dirent_openbsd.go
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dirent_solaris.go
759 bytes
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dirent_wasip1.go
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endian_big.go
244 bytes
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endian_little.go
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env.go
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env_test.go
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env_unix_test.go
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error.go
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error_errno.go
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error_plan9.go
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error_posix.go
538 bytes
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error_test.go
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error_unix_test.go
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error_windows_test.go
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example_test.go
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exec
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exec.go
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exec_plan9.go
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exec_posix.go
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exec_unix.go
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exec_unix_test.go
999 bytes
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exec_windows.go
4.57 KB
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exec_windows_test.go
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executable.go
774 bytes
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executable_darwin.go
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executable_dragonfly.go
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executable_freebsd.go
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executable_path.go
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executable_plan9.go
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executable_procfs.go
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executable_solaris.go
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executable_sysctl.go
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executable_test.go
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executable_wasm.go
333 bytes
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executable_windows.go
641 bytes
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export_linux_test.go
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export_test.go
433 bytes
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export_unix_test.go
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export_windows_test.go
395 bytes
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fifo_test.go
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file.go
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file_mutex_plan9.go
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file_open_unix.go
397 bytes
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file_open_wasip1.go
818 bytes
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file_plan9.go
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file_posix.go
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file_unix.go
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file_wasip1.go
633 bytes
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file_windows.go
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getwd.go
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os_test.go
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os_unix_test.go
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os_windows_test.go
41.83 KB
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path.go
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path_plan9.go
492 bytes
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path_test.go
2.96 KB
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path_unix.go
1.56 KB
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path_windows.go
5.66 KB
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path_windows_test.go
4.03 KB
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pipe2_unix.go
640 bytes
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pipe_test.go
12.41 KB
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pipe_unix.go
760 bytes
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pipe_wasm.go
488 bytes
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proc.go
2.27 KB
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rawconn.go
993 bytes
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rawconn_test.go
1.15 KB
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read_test.go
3.2 KB
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readfrom_linux_test.go
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removeall_at.go
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removeall_noat.go
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removeall_test.go
11.96 KB
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signal
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02/02/2024 06:09:55 PM
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stat.go
965 bytes
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stat_aix.go
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stat_darwin.go
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stat_dragonfly.go
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stat_freebsd.go
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stat_js.go
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stat_linux.go
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stat_netbsd.go
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stat_openbsd.go
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stat_plan9.go
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stat_solaris.go
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stat_test.go
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stat_unix.go
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stat_wasip1.go
956 bytes
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stat_windows.go
4.93 KB
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sticky_bsd.go
425 bytes
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sticky_notbsd.go
320 bytes
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sys.go
294 bytes
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sys_aix.go
682 bytes
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sys_bsd.go
466 bytes
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sys_js.go
313 bytes
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sys_linux.go
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sys_plan9.go
453 bytes
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sys_solaris.go
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sys_unix.go
493 bytes
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sys_wasip1.go
309 bytes
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sys_windows.go
874 bytes
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tempfile.go
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tempfile_test.go
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testdata
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timeout_test.go
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types.go
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types_plan9.go
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types_unix.go
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types_windows.go
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user
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wait6_dragonfly.go
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wait6_freebsd64.go
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wait6_freebsd_386.go
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wait6_freebsd_arm.go
549 bytes
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wait6_netbsd.go
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wait_unimp.go
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wait_wait6.go
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wait_waitid.go
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writeto_linux_test.go
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zero_copy_linux.go
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zero_copy_stub.go
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Editing: zero_copy_linux.go
Close
// Copyright 2020 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package os import ( "internal/poll" "io" "syscall" ) var ( pollCopyFileRange = poll.CopyFileRange pollSplice = poll.Splice pollSendFile = poll.SendFile ) func (f *File) writeTo(w io.Writer) (written int64, handled bool, err error) { pfd, network := getPollFDAndNetwork(w) // TODO(panjf2000): same as File.spliceToFile. if pfd == nil || !pfd.IsStream || !isUnixOrTCP(string(network)) { return } sc, err := f.SyscallConn() if err != nil { return } rerr := sc.Read(func(fd uintptr) (done bool) { written, err, handled = pollSendFile(pfd, int(fd), 1<<63-1) return true }) if err == nil { err = rerr } return written, handled, wrapSyscallError("sendfile", err) } func (f *File) readFrom(r io.Reader) (written int64, handled bool, err error) { // Neither copy_file_range(2) nor splice(2) supports destinations opened with // O_APPEND, so don't bother to try zero-copy with these system calls. // // Visit https://man7.org/linux/man-pages/man2/copy_file_range.2.html#ERRORS and // https://man7.org/linux/man-pages/man2/splice.2.html#ERRORS for details. if f.appendMode { return 0, false, nil } written, handled, err = f.copyFileRange(r) if handled { return } return f.spliceToFile(r) } func (f *File) spliceToFile(r io.Reader) (written int64, handled bool, err error) { var ( remain int64 lr *io.LimitedReader ) if lr, r, remain = tryLimitedReader(r); remain <= 0 { return 0, true, nil } pfd, _ := getPollFDAndNetwork(r) // TODO(panjf2000): run some tests to see if we should unlock the non-streams for splice. // Streams benefit the most from the splice(2), non-streams are not even supported in old kernels // where splice(2) will just return EINVAL; newer kernels support non-streams like UDP, but I really // doubt that splice(2) could help non-streams, cuz they usually send small frames respectively // and one splice call would result in one frame. // splice(2) is suitable for large data but the generation of fragments defeats its edge here. // Therefore, don't bother to try splice if the r is not a streaming descriptor. if pfd == nil || !pfd.IsStream { return } var syscallName string written, handled, syscallName, err = pollSplice(&f.pfd, pfd, remain) if lr != nil { lr.N = remain - written } return written, handled, wrapSyscallError(syscallName, err) } func (f *File) copyFileRange(r io.Reader) (written int64, handled bool, err error) { var ( remain int64 lr *io.LimitedReader ) if lr, r, remain = tryLimitedReader(r); remain <= 0 { return 0, true, nil } var src *File switch v := r.(type) { case *File: src = v case fileWithoutWriteTo: src = v.File default: return 0, false, nil } if src.checkValid("ReadFrom") != nil { // Avoid returning the error as we report handled as false, // leave further error handling as the responsibility of the caller. return 0, false, nil } written, handled, err = pollCopyFileRange(&f.pfd, &src.pfd, remain) if lr != nil { lr.N -= written } return written, handled, wrapSyscallError("copy_file_range", err) } // getPollFDAndNetwork tries to get the poll.FD and network type from the given interface // by expecting the underlying type of i to be the implementation of syscall.Conn // that contains a *net.rawConn. func getPollFDAndNetwork(i any) (*poll.FD, poll.String) { sc, ok := i.(syscall.Conn) if !ok { return nil, "" } rc, err := sc.SyscallConn() if err != nil { return nil, "" } irc, ok := rc.(interface { PollFD() *poll.FD Network() poll.String }) if !ok { return nil, "" } return irc.PollFD(), irc.Network() } // tryLimitedReader tries to assert the io.Reader to io.LimitedReader, it returns the io.LimitedReader, // the underlying io.Reader and the remaining amount of bytes if the assertion succeeds, // otherwise it just returns the original io.Reader and the theoretical unlimited remaining amount of bytes. func tryLimitedReader(r io.Reader) (*io.LimitedReader, io.Reader, int64) { var remain int64 = 1<<63 - 1 // by default, copy until EOF lr, ok := r.(*io.LimitedReader) if !ok { return nil, r, remain } remain = lr.N return lr, lr.R, remain } func isUnixOrTCP(network string) bool { switch network { case "tcp", "tcp4", "tcp6", "unix": return true default: return false } }