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authorSebastian Lackner2019-01-05 15:44:32 +0100
committerJakob Unterwurzacher2019-01-05 16:12:16 +0100
commit7e05e809b7579ad0473fff6ce466c19d417d4e93 (patch)
treef4ba0f8b29c2a1ac7595b544a335db3aa32d75ed /internal/fusefrontend
parentad15ad99856f90f3a72be4bd22ce44338645c963 (diff)
main: Run 'ensure fds' code early during the program startup.
The files are apparently processed in alphabetic order, so cli_args.go is processed before main.go. In order to run before the go-fuse imports, put the 'ensure fds' code in a separate package. Debug messages are omitted to avoid additional imports (that might contain other code messing up our file descriptors).
Diffstat (limited to 'internal/fusefrontend')
-rw-r--r--internal/fusefrontend/dircache.go4
1 files changed, 4 insertions, 0 deletions
diff --git a/internal/fusefrontend/dircache.go b/internal/fusefrontend/dircache.go
index 6d0d570..68fd99c 100644
--- a/internal/fusefrontend/dircache.go
+++ b/internal/fusefrontend/dircache.go
@@ -35,6 +35,8 @@ type dirCacheEntryStruct struct {
func (e *dirCacheEntryStruct) Clear() {
// An earlier clear may have already closed the fd, or the cache
// has never been filled (fd is 0 in that case).
+ // Note: package ensurefds012, imported from main, guarantees that dirCache
+ // can never get fds 0,1,2.
if e.fd > 0 {
err := syscall.Close(e.fd)
if err != nil {
@@ -72,6 +74,8 @@ func (d *dirCacheStruct) Clear() {
// Store the entry in the cache. The passed "fd" will be Dup()ed, and the caller
// can close their copy at will.
func (d *dirCacheStruct) Store(dirRelPath string, fd int, iv []byte) {
+ // Note: package ensurefds012, imported from main, guarantees that dirCache
+ // can never get fds 0,1,2.
if fd <= 0 || len(iv) != nametransform.DirIVLen {
log.Panicf("Store sanity check failed: fd=%d len=%d", fd, len(iv))
}