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      1 /*	$NetBSD: h_execsig.c,v 1.1 2025/03/13 01:27:27 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2025 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __RCSID("$NetBSD: h_execsig.c,v 1.1 2025/03/13 01:27:27 riastradh Exp $");
     31 
     32 /*
     33  * Helper program for testing signal delivery during execve(2) and
     34  * posix_spawn(2).  The caller will:
     35  *
     36  * 1. fork and exec, or spawn
     37  * 2. kill the child
     38  * 3. write a byte to be read from the child's stdin
     39  *
     40  * Since the caller issues syscalls in that order, the signal should be
     41  * delivered to the child first, and it should be interrupted by a
     42  * signal before it returnsa byte from read(2).
     43  */
     44 
     45 #include <err.h>
     46 #include <unistd.h>
     47 
     48 int
     49 main(void)
     50 {
     51 
     52 	if (read(STDIN_FILENO, (char[]){0}, 1) == -1)
     53 		err(1, "read");
     54 	return 0;
     55 }
     56