88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
package syscallcompat
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import (
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"syscall"
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"golang.org/x/sys/unix"
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)
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// retryEINTR executes operation `op` and retries if it gets EINTR.
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//
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// Like ignoringEINTR() in the Go stdlib:
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// https://github.com/golang/go/blob/d2a80f3fb5b44450e0b304ac5a718f99c053d82a/src/os/file_posix.go#L243
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//
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// This is needed because CIFS throws lots of EINTR errors:
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// https://github.com/rfjakob/gocryptfs/issues/483
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//
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// Don't use retryEINTR() with syscall.Close()!
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// See https://code.google.com/p/chromium/issues/detail?id=269623 .
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func retryEINTR(op func() error) error {
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for {
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err := op()
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if err != syscall.EINTR {
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return err
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}
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}
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}
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// retryEINTR2 is like retryEINTR but for functions that return an (int, error)
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// pair like syscall.Create().
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func retryEINTR2(op func() (int, error)) (int, error) {
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for {
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ret, err := op()
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if err != syscall.EINTR {
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return ret, err
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}
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}
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}
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// Open wraps syscall.Open.
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// Retries on EINTR.
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func Open(path string, mode int, perm uint32) (fd int, err error) {
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fd, err = retryEINTR2(func() (int, error) {
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return syscall.Open(path, mode, perm)
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})
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return fd, err
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}
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// Renameat wraps the Renameat syscall.
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// Retries on EINTR.
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func Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) {
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err = retryEINTR(func() error {
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return unix.Renameat(olddirfd, oldpath, newdirfd, newpath)
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})
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return err
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}
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// Unlinkat syscall.
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// Retries on EINTR.
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func Unlinkat(dirfd int, path string, flags int) (err error) {
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err = retryEINTR(func() error {
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return unix.Unlinkat(dirfd, path, flags)
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})
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return err
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}
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// Flush is a helper for the FUSE command FLUSH.
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// Retries on EINTR.
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func Flush(fd int) error {
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for {
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// Flushing is achieved by closing a dup'd fd.
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newFd, err := syscall.Dup(fd)
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if err == syscall.EINTR {
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continue
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}
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if err != nil {
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return err
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}
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err = syscall.Close(newFd)
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// Even if we get EINTR here, newFd is dead - see
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// https://code.google.com/p/chromium/issues/detail?id=269623 .
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// We have to make a new one with Dup(), so continue at the top.
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if err == syscall.EINTR {
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continue
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}
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return err
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}
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}
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