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d962568e93
This will simplify examining the returned errors such as httpserver.ErrorWithStatusCode . See https://blog.golang.org/go1.13-errors for details.
65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package filestream
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import (
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"fmt"
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"syscall"
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"golang.org/x/sys/unix"
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)
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func (st *streamTracker) adviseDontNeed(n int, fdatasync bool) error {
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st.length += uint64(n)
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if st.fd == 0 {
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return nil
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}
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if st.length < dontNeedBlockSize {
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return nil
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}
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blockSize := st.length - (st.length % dontNeedBlockSize)
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if fdatasync {
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if err := unixFdatasync(int(st.fd)); err != nil {
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return fmt.Errorf("unix.Fdatasync error: %w", err)
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}
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}
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if err := unix.Fadvise(int(st.fd), int64(st.offset), int64(blockSize), unix.FADV_DONTNEED); err != nil {
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return fmt.Errorf("unix.Fadvise(FADV_DONTNEEDED, %d, %d) error: %w", st.offset, blockSize, err)
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}
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st.offset += blockSize
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st.length -= blockSize
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return nil
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}
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func (st *streamTracker) close() error {
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if st.fd == 0 {
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return nil
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}
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// Advise the whole file as it shouldn't be cached.
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if err := unix.Fadvise(int(st.fd), 0, 0, unix.FADV_DONTNEED); err != nil {
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return fmt.Errorf("unix.Fadvise(FADV_DONTNEEDED, 0, 0) error: %w", err)
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}
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return nil
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}
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// unix.Fdatasync is missing, so put it here
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func unixFdatasync(fd int) (err error) {
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_, _, e1 := unix.Syscall(unix.SYS_FDATASYNC, uintptr(fd), 0, 0)
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if e1 != 0 {
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err = errnoErr(e1)
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}
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return
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}
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func errnoErr(e syscall.Errno) error {
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switch e {
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case 0:
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return nil
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case unix.EAGAIN:
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return syscall.EAGAIN
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case unix.EINVAL:
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return syscall.EINVAL
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case unix.ENOENT:
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return syscall.ENOENT
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}
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return e
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}
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