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Diffstat (limited to 'main.go')
-rw-r--r--main.go25
1 files changed, 25 insertions, 0 deletions
diff --git a/main.go b/main.go
index a376356..619b1ce 100644
--- a/main.go
+++ b/main.go
@@ -8,6 +8,7 @@ import (
"runtime"
"strconv"
"strings"
+ "syscall"
"github.com/hanwen/go-fuse/fuse"
@@ -149,6 +150,7 @@ func printVersion() {
}
func main() {
+ ensureStdFds()
mxp := runtime.GOMAXPROCS(0)
if mxp < 4 {
// On a 2-core machine, setting maxprocs to 4 gives 10% better performance
@@ -328,3 +330,26 @@ func main() {
os.Exit(0)
}
}
+
+// ensureStdFds ensures that file descriptors 0,1,2 are open. The Go stdlib,
+// as well as the gocryptfs code, relies on the fact that fds 0,1,2 are always
+// open.
+// See https://github.com/rfjakob/gocryptfs/issues/320 for details.
+//
+// This function should be called as the first thing from main().
+func ensureStdFds() {
+ fd, err := syscall.Open("/dev/null", syscall.O_RDWR, 0)
+ if err != nil {
+ tlog.Fatal.Printf("ensureStdFds: open /dev/null failed: %v", err)
+ os.Exit(exitcodes.DevNull)
+ }
+ for fd <= 2 {
+ fd, err = syscall.Dup(fd)
+ if err != nil {
+ tlog.Fatal.Printf("ensureStdFds: dup failed: %v", err)
+ os.Exit(exitcodes.DevNull)
+ }
+ }
+ // Close excess fd (usually fd 3)
+ syscall.Close(fd)
+}