1 #include <fcntl.h> 2 #include <sys/fcntl.h> 3 #include <darwintest.h> 4 #include <darwintest_utils.h> 5 6 7 T_GLOBAL_META( 8 T_META_NAMESPACE("xnu.ipc"), 9 T_META_RADAR_COMPONENT_NAME("xnu"), 10 T_META_RADAR_COMPONENT_VERSION("IPC"), 11 T_META_OWNER("jonathan_w_adams"), 12 T_META_RUN_CONCURRENTLY(TRUE)); 13 14 /* 15 * See rdar://77264182: xnu's lockf implementation had trouble 16 * with l_len = 0 (e.g. go to EOF) being treated differently 17 * than (l_start + l_len - 1) == OFF_MAX, even though they are 18 * effectively the same thing. ~25 loops of this test was enough 19 * to get an Intel mac into an infinite loop in the kernel. 20 */ 21 T_DECL(lockf_EOF_77264182, 22 "try to stress out lockf requests around OFF_MAX/EOF", 23 T_META_CHECK_LEAKS(false)) 24 { 25 const char *dir = dt_tmpdir(); 26 int fd; 27 T_ASSERT_POSIX_SUCCESS(chdir(dir), "chdir(%s)", dir); 28 29 T_ASSERT_POSIX_SUCCESS((fd = open("lockf_EOF_test", O_CREAT | O_RDWR, 0666)), "open(lockf_EOF_test)"); 30 31 /* 32 * At each loop, we do: 33 * write lock [OFF_MAX - loop, EOF) 34 * unlock [OFF_MAX - loop, OFF_MAX) 35 * write lock [OFF_MAX - loop - 1, OFF_MAX) 36 */ 37 int loops; 38 for (loops = 0; loops < 100; loops++) { 39 struct flock fl = { 40 .l_start = OFF_MAX - loops, 41 .l_len = 0, 42 .l_pid = getpid(), 43 .l_type = F_WRLCK, 44 .l_whence = SEEK_SET 45 }; 46 T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_SETLK, &fl), "wrlock"); 47 fl.l_len = OFF_MAX - fl.l_start + 1; 48 fl.l_type = F_UNLCK; 49 T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_SETLK, &fl), "unlock"); 50 fl.l_start--; 51 fl.l_len++; 52 fl.l_type = F_WRLCK; 53 T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_SETLK, &fl), "wrlock 2"); 54 } 55 T_PASS("did %d loops", loops); 56 } 57