1 files changed, 13 insertions, 0 deletions
diff --git a/misc/dup2_inout.c b/misc/dup2_inout.c
new file mode 100644
index 0000000..13132d8
--- /dev/null
+++ b/misc/dup2_inout.c
@@ -0,0 +1,13 @@
+#include <unistd.h>
+#include <fcntl.h>
+
+void dup2_inout(char *file, int from, mode_t mode) /*EXTRACT_INCL*/ {
+  int to = open(file, mode);
+  if (to == from || to == -1) return;
+  while (1) {
+    dup2(to,from);
+    fcntl(from,F_SETFD,0);
+    if (from++ != 1) break;
+  }
+  close(to);
+}