netbsd-tests: Fix the mmap_truncate_signal test

Add a volatile qualifier in the loop which triggers SIGBUS, as otherwise
the compiler is smart enough to elide it, replacing it with a check for
page != 0.

MFC after:	1 week

This commit is contained in:

Mark Johnston

2026-04-26 01:53:45 +00:00

parent a02d794f5a

commit e3b8e55e71

1 changed files with 1 additions and 1 deletions

									
										contrib/netbsd-tests/lib/libc/sys/t_mmap.c
									
		+1
		-1
	
												View File
												
				@@ -504,7 +504,7 @@ ATF_TC_BODY(mmap_truncate_signal, tc)

						ATF_REQUIRE(signal(SIGSEGV, map_sighandler) != SIG_ERR);

						sta = 0;

						for (i = 0; i < page; i++)

							sta += map[i];

							sta += ((volatile char *)map)[i];

						/* child never will get this far, but the compiler will

						   not know, so better use the values calculated to

						   prevent the access to be optimized out */