Stephen Hines | 6d18623 | 2014-11-26 17:56:19 -0800 | [diff] [blame] | 1 | // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
| 2 | |
| 3 | // Test case for longjumping out of signal handler: |
| 4 | // https://code.google.com/p/thread-sanitizer/issues/detail?id=75 |
| 5 | |
Pirama Arumuga Nainar | cdce50b | 2015-07-01 12:26:56 -0700 | [diff] [blame] | 6 | // Longjmp assembly has not been implemented for mips64 yet |
| 7 | // XFAIL: mips64 |
| 8 | |
Stephen Hines | 6d18623 | 2014-11-26 17:56:19 -0800 | [diff] [blame] | 9 | #include <setjmp.h> |
| 10 | #include <signal.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <stdio.h> |
| 13 | #include <sys/mman.h> |
| 14 | |
| 15 | sigjmp_buf fault_jmp; |
| 16 | volatile int fault_expected; |
| 17 | |
| 18 | void sigfault_handler(int sig) { |
| 19 | if (!fault_expected) |
| 20 | abort(); |
| 21 | |
| 22 | /* just return from sighandler to proper place */ |
| 23 | fault_expected = 0; |
| 24 | siglongjmp(fault_jmp, 1); |
| 25 | } |
| 26 | |
| 27 | #define MUST_FAULT(code) do { \ |
| 28 | fault_expected = 1; \ |
| 29 | if (!sigsetjmp(fault_jmp, 1)) { \ |
| 30 | code; /* should pagefault -> sihandler does longjmp */ \ |
| 31 | fprintf(stderr, "%s not faulted\n", #code); \ |
| 32 | abort(); \ |
| 33 | } else { \ |
| 34 | fprintf(stderr, "%s faulted ok\n", #code); \ |
| 35 | } \ |
| 36 | } while (0) |
| 37 | |
| 38 | int main() { |
| 39 | struct sigaction act; |
| 40 | act.sa_handler = sigfault_handler; |
| 41 | act.sa_flags = 0; |
| 42 | if (sigemptyset(&act.sa_mask)) { |
| 43 | perror("sigemptyset"); |
| 44 | exit(1); |
| 45 | } |
| 46 | |
| 47 | if (sigaction(SIGSEGV, &act, NULL)) { |
| 48 | perror("sigaction"); |
| 49 | exit(1); |
| 50 | } |
| 51 | |
| 52 | void *mem = mmap(0, 4096, PROT_NONE, MAP_PRIVATE | MAP_ANON, |
| 53 | -1, 0); |
| 54 | |
| 55 | MUST_FAULT(((volatile int *volatile)mem)[0] = 0); |
| 56 | MUST_FAULT(((volatile int *volatile)mem)[1] = 1); |
| 57 | MUST_FAULT(((volatile int *volatile)mem)[3] = 1); |
| 58 | |
| 59 | // Ensure that tsan does not think that we are |
| 60 | // in a signal handler. |
| 61 | void *volatile p = malloc(10); |
| 62 | ((volatile int*)p)[1] = 1; |
| 63 | free((void*)p); |
| 64 | |
| 65 | munmap(p, 4096); |
| 66 | |
| 67 | fprintf(stderr, "DONE\n"); |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | // CHECK-NOT: WARNING: ThreadSanitizer |
| 72 | // CHECK: DONE |