main: move redirectStdFds() to daemonize.go

This really is a part of daemonization.

No code changes.

1 files changed, 42 insertions, 0 deletions

diff --git a/daemonize.go b/daemonize.go
index de09743..886a229 100644
--- a/daemonize.go
+++ b/daemonize.go
@@ -8,6 +8,7 @@ import (
 	"syscall"
 
 	"github.com/rfjakob/gocryptfs/internal/exitcodes"
+	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
 	"github.com/rfjakob/gocryptfs/internal/tlog"
 )
 
@@ -52,3 +53,44 @@ func forkChild() int {
 	// The child exited with 0 - let's do the same.
 	return 0
 }
+
+// redirectStdFds redirects stderr and stdout to syslog; stdin to /dev/null
+func redirectStdFds() {
+	// stderr and stdout
+	pr, pw, err := os.Pipe()
+	if err != nil {
+		tlog.Warn.Printf("redirectStdFds: could not create pipe: %v\n", err)
+		return
+	}
+	tag := fmt.Sprintf("gocryptfs-%d-logger", os.Getpid())
+	cmd := exec.Command("logger", "-t", tag)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = pr
+	err = cmd.Start()
+	if err != nil {
+		tlog.Warn.Printf("redirectStdFds: could not start logger: %v\n", err)
+	}
+	pr.Close()
+	err = syscallcompat.Dup3(int(pw.Fd()), 1, 0)
+	if err != nil {
+		tlog.Warn.Printf("redirectStdFds: stdout dup error: %v\n", err)
+	}
+	syscallcompat.Dup3(int(pw.Fd()), 2, 0)
+	if err != nil {
+		tlog.Warn.Printf("redirectStdFds: stderr dup error: %v\n", err)
+	}
+	pw.Close()
+
+	// stdin
+	nullFd, err := os.Open("/dev/null")
+	if err != nil {
+		tlog.Warn.Printf("redirectStdFds: could not open /dev/null: %v\n", err)
+		return
+	}
+	err = syscallcompat.Dup3(int(nullFd.Fd()), 0, 0)
+	if err != nil {
+		tlog.Warn.Printf("redirectStdFds: stdin dup error: %v\n", err)
+	}
+	nullFd.Close()
+}