proc: cleaner extra files

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

1 files changed, 13 insertions, 0 deletions

diff --git a/internal/proc/files.go b/internal/proc/files.go
new file mode 100644
index 00000000..5a5e1c26
--- /dev/null
+++ b/internal/proc/files.go
@@ -0,0 +1,13 @@
+package proc
+
+import (
+	"os"
+	"os/exec"
+)
+
+func ExtraFile(cmd *exec.Cmd, f *os.File) (fd uintptr) {
+	// ExtraFiles: If non-nil, entry i becomes file descriptor 3+i.
+	fd = uintptr(3 + len(cmd.ExtraFiles))
+	cmd.ExtraFiles = append(cmd.ExtraFiles, f)
+	return
+}