[PATCH 4/5] unshare: store child PID in global variable

[Kiran Rangoon <kiranrangoon0@gmail.com>]

After fork(), store the child PID in the global child_pid variable
so the signal handler can forward signals to it. Clear child_pid in
the child process to prevent recursion.

Signed-off-by: Kiran Rangoon <kiranrangoon0@gmail.com>
---
 sys-utils/unshare.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys-utils/unshare.c b/sys-utils/unshare.c
index 9255ff4f8..8bc805e05 100644
--- a/sys-utils/unshare.c
+++ b/sys-utils/unshare.c
@@ -1149,6 +1149,7 @@ int main(int argc, char *argv[])
 		case -1:
 			err(EXIT_FAILURE, _("fork failed"));
 		case 0:	/* child */
+			child_pid = 0;  /* Clear in child process */
 			if (sigprocmask(SIG_SETMASK, &oldsigset, NULL))
 				err(EXIT_FAILURE,
 					_("sigprocmask restore failed"));
@@ -1156,6 +1157,7 @@ int main(int argc, char *argv[])
 				close(fd_bind);
 			break;
 		default: /* parent */
+			child_pid = pid;  /* Store child PID for signal handler */
 			break;
 		}
 	}
-- 
2.47.3