1*043036a2SApple OSS Distributions #include <fcntl.h> 2*043036a2SApple OSS Distributions #include <sys/fcntl.h> 3*043036a2SApple OSS Distributions #include <darwintest.h> 4*043036a2SApple OSS Distributions #include <darwintest_utils.h> 5*043036a2SApple OSS Distributions 6*043036a2SApple OSS Distributions 7*043036a2SApple OSS Distributions T_GLOBAL_META( 8*043036a2SApple OSS Distributions T_META_NAMESPACE("xnu.ipc"), 9*043036a2SApple OSS Distributions T_META_RADAR_COMPONENT_NAME("xnu"), 10*043036a2SApple OSS Distributions T_META_RADAR_COMPONENT_VERSION("IPC"), 11*043036a2SApple OSS Distributions T_META_OWNER("jonathan_w_adams"), 12*043036a2SApple OSS Distributions T_META_RUN_CONCURRENTLY(TRUE)); 13*043036a2SApple OSS Distributions 14*043036a2SApple OSS Distributions /* 15*043036a2SApple OSS Distributions * See rdar://77264182: xnu's lockf implementation had trouble 16*043036a2SApple OSS Distributions * with l_len = 0 (e.g. go to EOF) being treated differently 17*043036a2SApple OSS Distributions * than (l_start + l_len - 1) == OFF_MAX, even though they are 18*043036a2SApple OSS Distributions * effectively the same thing. ~25 loops of this test was enough 19*043036a2SApple OSS Distributions * to get an Intel mac into an infinite loop in the kernel. 20*043036a2SApple OSS Distributions */ 21*043036a2SApple OSS Distributions T_DECL(lockf_EOF_77264182, 22*043036a2SApple OSS Distributions "try to stress out lockf requests around OFF_MAX/EOF", 23*043036a2SApple OSS Distributions T_META_CHECK_LEAKS(false), T_META_TAG_VM_PREFERRED) 24*043036a2SApple OSS Distributions { 25*043036a2SApple OSS Distributions const char *dir = dt_tmpdir(); 26*043036a2SApple OSS Distributions int fd; 27*043036a2SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(chdir(dir), "chdir(%s)", dir); 28*043036a2SApple OSS Distributions 29*043036a2SApple OSS Distributions T_ASSERT_POSIX_SUCCESS((fd = open("lockf_EOF_test", O_CREAT | O_RDWR, 0666)), "open(lockf_EOF_test)"); 30*043036a2SApple OSS Distributions 31*043036a2SApple OSS Distributions /* 32*043036a2SApple OSS Distributions * At each loop, we do: 33*043036a2SApple OSS Distributions * write lock [OFF_MAX - loop, EOF) 34*043036a2SApple OSS Distributions * unlock [OFF_MAX - loop, OFF_MAX) 35*043036a2SApple OSS Distributions * write lock [OFF_MAX - loop - 1, OFF_MAX) 36*043036a2SApple OSS Distributions */ 37*043036a2SApple OSS Distributions int loops; 38*043036a2SApple OSS Distributions for (loops = 0; loops < 100; loops++) { 39*043036a2SApple OSS Distributions struct flock fl = { 40*043036a2SApple OSS Distributions .l_start = OFF_MAX - loops, 41*043036a2SApple OSS Distributions .l_len = 0, 42*043036a2SApple OSS Distributions .l_pid = getpid(), 43*043036a2SApple OSS Distributions .l_type = F_WRLCK, 44*043036a2SApple OSS Distributions .l_whence = SEEK_SET 45*043036a2SApple OSS Distributions }; 46*043036a2SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_SETLK, &fl), "wrlock"); 47*043036a2SApple OSS Distributions fl.l_len = OFF_MAX - fl.l_start + 1; 48*043036a2SApple OSS Distributions fl.l_type = F_UNLCK; 49*043036a2SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_SETLK, &fl), "unlock"); 50*043036a2SApple OSS Distributions fl.l_start--; 51*043036a2SApple OSS Distributions fl.l_len++; 52*043036a2SApple OSS Distributions fl.l_type = F_WRLCK; 53*043036a2SApple OSS Distributions T_ASSERT_POSIX_SUCCESS(fcntl(fd, F_SETLK, &fl), "wrlock 2"); 54*043036a2SApple OSS Distributions } 55*043036a2SApple OSS Distributions T_PASS("did %d loops", loops); 56*043036a2SApple OSS Distributions } 57