1 //===-- sanitizer_file.h ---------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===---------------------------------------------------------------------===// 8 // 9 // This file is shared between run-time libraries of sanitizers. 10 // It declares filesystem-related interfaces. This is separate from 11 // sanitizer_common.h so that it's simpler to disable all the filesystem 12 // support code for a port that doesn't use it. 13 // 14 //===---------------------------------------------------------------------===// 15 #ifndef SANITIZER_FILE_H 16 #define SANITIZER_FILE_H 17 18 #include "sanitizer_interface_internal.h" 19 #include "sanitizer_internal_defs.h" 20 #include "sanitizer_libc.h" 21 #include "sanitizer_mutex.h" 22 23 namespace __sanitizer { 24 25 struct ReportFile { 26 void Write(const char *buffer, uptr length); 27 bool SupportsColors(); 28 void SetReportPath(const char *path); 29 30 // Don't use fields directly. They are only declared public to allow 31 // aggregate initialization. 32 33 // Protects fields below. 34 StaticSpinMutex *mu; 35 // Opened file descriptor. Defaults to stderr. It may be equal to 36 // kInvalidFd, in which case new file will be opened when necessary. 37 fd_t fd; 38 // Path prefix of report file, set via __sanitizer_set_report_path. 39 char path_prefix[kMaxPathLength]; 40 // Full path to report, obtained as <path_prefix>.PID 41 char full_path[kMaxPathLength]; 42 // PID of the process that opened fd. If a fork() occurs, 43 // the PID of child will be different from fd_pid. 44 uptr fd_pid; 45 46 private: 47 void ReopenIfNecessary(); 48 }; 49 extern ReportFile report_file; 50 51 enum FileAccessMode { 52 RdOnly, 53 WrOnly, 54 RdWr 55 }; 56 57 // Returns kInvalidFd on error. 58 fd_t OpenFile(const char *filename, FileAccessMode mode, 59 error_t *errno_p = nullptr); 60 void CloseFile(fd_t); 61 62 // Return true on success, false on error. 63 bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, 64 uptr *bytes_read = nullptr, error_t *error_p = nullptr); 65 bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, 66 uptr *bytes_written = nullptr, error_t *error_p = nullptr); 67 68 // Scoped file handle closer. 69 struct FileCloser { 70 explicit FileCloser(fd_t fd) : fd(fd) {} 71 ~FileCloser() { CloseFile(fd); } 72 fd_t fd; 73 }; 74 75 bool SupportsColoredOutput(fd_t fd); 76 77 // OS 78 const char *GetPwd(); 79 bool FileExists(const char *filename); 80 char *FindPathToBinary(const char *name); 81 bool IsPathSeparator(const char c); 82 bool IsAbsolutePath(const char *path); 83 // Starts a subprocess and returs its pid. 84 // If *_fd parameters are not kInvalidFd their corresponding input/output 85 // streams will be redirect to the file. The files will always be closed 86 // in parent process even in case of an error. 87 // The child process will close all fds after STDERR_FILENO 88 // before passing control to a program. 89 pid_t StartSubprocess(const char *filename, const char *const argv[], 90 const char *const envp[], fd_t stdin_fd = kInvalidFd, 91 fd_t stdout_fd = kInvalidFd, fd_t stderr_fd = kInvalidFd); 92 // Checks if specified process is still running 93 bool IsProcessRunning(pid_t pid); 94 // Waits for the process to finish and returns its exit code. 95 // Returns -1 in case of an error. 96 int WaitForProcess(pid_t pid); 97 98 // Maps given file to virtual memory, and returns pointer to it 99 // (or NULL if mapping fails). Stores the size of mmaped region 100 // in '*buff_size'. 101 void *MapFileToMemory(const char *file_name, uptr *buff_size); 102 void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset); 103 104 } // namespace __sanitizer 105 106 #endif // SANITIZER_FILE_H 107