libsanitizer/sanitizer_common/sanitizer_file.h

   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                       fd_t stdin_fd = kInvalidFd, fd_t stdout_fd = kInvalidFd,
  91                       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