[PATCH 2/5] unshare: add signal forwarding handler

Add forward_signal() function that forwards SIGTERM/SIGINT from the
parent process to the child process. This will be installed as a
signal handler in the next step.

Signed-off-by: Kiran Rangoon <[email protected]>
---
 sys-utils/unshare.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sys-utils/unshare.c b/sys-utils/unshare.c
index 6df53666a..3850e5f4a 100644
--- a/sys-utils/unshare.c
+++ b/sys-utils/unshare.c
@@ -122,6 +122,19 @@ static void setgroups_control(int action)
 	close(fd);
 }
 
+/**
+ * forward_signal() - Forward signal to child process
+ * @sig: Signal number to forward
+ *
+ * Signal handler that forwards SIGTERM/SIGINT from parent to child.
+ * This allows the child to handle signals properly when using --fork.
+ */
+static void forward_signal(int sig)
+{
+	if (child_pid > 0)
+		kill(child_pid, sig);
+}
+
 static void map_id(const char *file, uint32_t from, uint32_t to)
 {
 	char *buf;
-- 
2.47.3