1 // RUN: %clangxx -fsanitize=realtime %s -o %t 2 // RUN: %env_rtsan_opts="halt_on_error=false" %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK-RTSAN,CHECK 3 4 // RUN: %clangxx %s -o %t 5 // RUN: %run %t 2>&1 | FileCheck %s 6 7 // UNSUPPORTED: ios 8 9 // Intent: Ensure the `syscall` call behaves in the same way with/without the 10 // sanitizer disabled 11 12 #include <fcntl.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include <sys/syscall.h> 17 #include <sys/types.h> 18 #include <unistd.h> 19 20 const char *GetTemporaryFilePath() { return "/tmp/rtsan_syscall_test.txt"; } 21 22 void custom_assert(bool condition, const char *message) { 23 if (!condition) { 24 fprintf(stderr, "ASSERTION FAILED: %s\n", message); 25 exit(1); 26 } 27 } 28 29 class ScopedFileCleanup { 30 public: 31 [[nodiscard]] ScopedFileCleanup() = default; 32 ~ScopedFileCleanup() { 33 if (access(GetTemporaryFilePath(), F_OK) != -1) 34 unlink(GetTemporaryFilePath()); 35 } 36 }; 37 38 // Apple has deprecated `syscall`, ignore that error 39 #pragma clang diagnostic push 40 #pragma clang diagnostic ignored "-Wdeprecated-declarations" 41 int main() [[clang::nonblocking]] { 42 ScopedFileCleanup cleanup; 43 44 { 45 int fd = syscall(SYS_openat, AT_FDCWD, GetTemporaryFilePath(), 46 O_CREAT | O_WRONLY, 0644); 47 48 custom_assert(fd != -1, "Failed to open file - write"); 49 50 int written = syscall(SYS_write, fd, "Hello, world!", 13); 51 custom_assert(written == 13, "Failed to write to file"); 52 53 custom_assert(syscall(SYS_close, fd) == 0, "Failed to close file - write"); 54 } 55 56 { 57 int fd = syscall(SYS_openat, AT_FDCWD, GetTemporaryFilePath(), O_RDONLY); 58 custom_assert(fd != -1, "Failed to open file - read"); 59 60 char buffer[13]; 61 int read = syscall(SYS_read, fd, buffer, 13); 62 custom_assert(read == 13, "Failed to read from file"); 63 64 custom_assert(memcmp(buffer, "Hello, world!", 13) == 0, 65 "Read data does not match written data"); 66 67 custom_assert(syscall(SYS_close, fd) == 0, "Failed to close file - read"); 68 } 69 70 unlink(GetTemporaryFilePath()); 71 printf("DONE\n"); 72 } 73 #pragma clang diagnostic pop 74 75 // CHECK-NOT: ASSERTION FAILED 76 // CHECK-RTSAN-COUNT-6: Intercepted call to real-time unsafe function `syscall` 77 78 // CHECK: DONE 79