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87 lines
2.1 KiB
87 lines
2.1 KiB
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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