diff options
| -rw-r--r-- | internal/exitcodes/exitcodes.go | 2 | ||||
| -rw-r--r-- | main.go | 25 |
2 files changed, 27 insertions, 0 deletions
diff --git a/internal/exitcodes/exitcodes.go b/internal/exitcodes/exitcodes.go index c4e18df..cd36988 100644 --- a/internal/exitcodes/exitcodes.go +++ b/internal/exitcodes/exitcodes.go @@ -70,6 +70,8 @@ const ( TrezorError = 28 // ExcludeError - an error occurred while processing "-exclude" ExcludeError = 29 + // DevNull means that /dev/null could not be opened + DevNull = 30 ) // Err wraps an error with an associated numeric exit code @@ -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) +} |