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-rw-r--r--daemonize.go13
1 files changed, 8 insertions, 5 deletions
diff --git a/daemonize.go b/daemonize.go
index 886a229..1f7b699 100644
--- a/daemonize.go
+++ b/daemonize.go
@@ -56,7 +56,9 @@ func forkChild() int {
// redirectStdFds redirects stderr and stdout to syslog; stdin to /dev/null
func redirectStdFds() {
- // stderr and stdout
+ // Create a pipe pair "pw" -> "pr" and start logger reading from "pr".
+ // We do it ourselves instead of using StdinPipe() because we need access
+ // to the fd numbers.
pr, pw, err := os.Pipe()
if err != nil {
tlog.Warn.Printf("redirectStdFds: could not create pipe: %v\n", err)
@@ -64,14 +66,15 @@ func redirectStdFds() {
}
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)
+ return
}
+ // The logger now reads on "pr". We can close it.
pr.Close()
+ // Redirect stout and stderr to "pw".
err = syscallcompat.Dup3(int(pw.Fd()), 1, 0)
if err != nil {
tlog.Warn.Printf("redirectStdFds: stdout dup error: %v\n", err)
@@ -80,9 +83,9 @@ func redirectStdFds() {
if err != nil {
tlog.Warn.Printf("redirectStdFds: stderr dup error: %v\n", err)
}
+ // Our stout and stderr point to "pw". We can close the extra copy.
pw.Close()
-
- // stdin
+ // Redirect stdin to /dev/null
nullFd, err := os.Open("/dev/null")
if err != nil {
tlog.Warn.Printf("redirectStdFds: could not open /dev/null: %v\n", err)