main, syscallcompat: use Dup3 instead of Dup2

Dup2 is not implemented on linux/arm64.

Fixes https://github.com/rfjakob/gocryptfs/issues/121 .

Also adds cross-compilation to CI.

1 files changed, 4 insertions, 3 deletions

diff --git a/mount.go b/mount.go
index de87d53..e19f2c8 100644
--- a/mount.go
+++ b/mount.go
@@ -25,6 +25,7 @@ import (
 	"github.com/rfjakob/gocryptfs/internal/fusefrontend"
 	"github.com/rfjakob/gocryptfs/internal/fusefrontend_reverse"
 	"github.com/rfjakob/gocryptfs/internal/readpassword"
+	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
 	"github.com/rfjakob/gocryptfs/internal/tlog"
 )
 
@@ -162,11 +163,11 @@ func redirectStdFds() {
 		tlog.Warn.Printf("redirectStdFds: could not start logger: %v\n", err)
 	}
 	pr.Close()
-	err = syscall.Dup2(int(pw.Fd()), 1)
+	err = syscallcompat.Dup3(int(pw.Fd()), 1, 0)
 	if err != nil {
 		tlog.Warn.Printf("redirectStdFds: stdout dup error: %v\n", err)
 	}
-	syscall.Dup2(int(pw.Fd()), 2)
+	syscallcompat.Dup3(int(pw.Fd()), 2, 0)
 	if err != nil {
 		tlog.Warn.Printf("redirectStdFds: stderr dup error: %v\n", err)
 	}
@@ -178,7 +179,7 @@ func redirectStdFds() {
 		tlog.Warn.Printf("redirectStdFds: could not open /dev/null: %v\n", err)
 		return
 	}
-	err = syscall.Dup2(int(nullFd.Fd()), 0)
+	err = syscallcompat.Dup3(int(nullFd.Fd()), 0, 0)
 	if err != nil {
 		tlog.Warn.Printf("redirectStdFds: stdin dup error: %v\n", err)
 	}