1 files changed, 55 insertions, 0 deletions
diff --git a/lib/libc/gen/h_execsig.c b/lib/libc/gen/h_execsig.c
new file mode 100644
index 000000000000..a954ca071094
--- /dev/null
+++ b/lib/libc/gen/h_execsig.c
@@ -0,0 +1,55 @@
+/*	$NetBSD: h_execsig.c,v 1.1 2025/03/13 01:27:27 riastradh Exp $	*/
+
+/*-
+ * Copyright (c) 2025 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: h_execsig.c,v 1.1 2025/03/13 01:27:27 riastradh Exp $");
+
+/*
+ * Helper program for testing signal delivery during execve(2) and
+ * posix_spawn(2).  The caller will:
+ *
+ * 1. fork and exec, or spawn
+ * 2. kill the child
+ * 3. write a byte to be read from the child's stdin
+ *
+ * Since the caller issues syscalls in that order, the signal should be
+ * delivered to the child first, and it should be interrupted by a
+ * signal before it returnsa byte from read(2).
+ */
+
+#include <err.h>
+#include <unistd.h>
+
+int
+main(void)
+{
+
+	if (read(STDIN_FILENO, (char[]){0}, 1) == -1)
+		err(1, "read");
+	return 0;
+}