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173
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1 //===-- runtime/file.cpp ----------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "file.h"
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10 #include "magic-numbers.h"
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11 #include "memory.h"
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221
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12 #include <algorithm>
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173
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13 #include <cerrno>
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14 #include <cstring>
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15 #include <fcntl.h>
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16 #include <stdlib.h>
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221
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17 #include <sys/stat.h>
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173
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18 #ifdef _WIN32
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221
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19 #define NOMINMAX
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173
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20 #include <io.h>
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21 #include <windows.h>
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22 #else
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23 #include <unistd.h>
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24 #endif
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25
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26 namespace Fortran::runtime::io {
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27
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28 void OpenFile::set_path(OwningPtr<char> &&path, std::size_t bytes) {
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29 path_ = std::move(path);
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30 pathLength_ = bytes;
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31 }
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32
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33 static int openfile_mkstemp(IoErrorHandler &handler) {
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34 #ifdef _WIN32
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35 const unsigned int uUnique{0};
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36 // GetTempFileNameA needs a directory name < MAX_PATH-14 characters in length.
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37 // https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettempfilenamea
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38 char tempDirName[MAX_PATH - 14];
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39 char tempFileName[MAX_PATH];
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40 unsigned long nBufferLength{sizeof(tempDirName)};
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41 nBufferLength = ::GetTempPathA(nBufferLength, tempDirName);
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42 if (nBufferLength > sizeof(tempDirName) || nBufferLength == 0) {
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43 return -1;
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44 }
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45 if (::GetTempFileNameA(tempDirName, "Fortran", uUnique, tempFileName) == 0) {
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46 return -1;
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47 }
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48 int fd{::_open(tempFileName, _O_CREAT | _O_TEMPORARY, _S_IREAD | _S_IWRITE)};
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49 #else
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50 char path[]{"/tmp/Fortran-Scratch-XXXXXX"};
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51 int fd{::mkstemp(path)};
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52 #endif
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53 if (fd < 0) {
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54 handler.SignalErrno();
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55 }
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56 #ifndef _WIN32
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57 ::unlink(path);
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58 #endif
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59 return fd;
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60 }
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61
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221
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62 void OpenFile::Open(OpenStatus status, std::optional<Action> action,
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63 Position position, IoErrorHandler &handler) {
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64 if (fd_ >= 0 &&
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65 (status == OpenStatus::Old || status == OpenStatus::Unknown)) {
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66 return;
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67 }
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68 if (fd_ >= 0) {
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69 if (fd_ <= 2) {
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70 // don't actually close a standard file descriptor, we might need it
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71 } else {
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72 if (::close(fd_) != 0) {
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73 handler.SignalErrno();
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74 }
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173
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75 }
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221
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76 fd_ = -1;
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77 }
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78 if (status == OpenStatus::Scratch) {
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173
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79 if (path_.get()) {
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80 handler.SignalError("FILE= must not appear with STATUS='SCRATCH'");
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81 path_.reset();
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82 }
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221
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83 if (!action) {
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84 action = Action::ReadWrite;
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85 }
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173
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86 fd_ = openfile_mkstemp(handler);
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221
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87 } else {
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88 if (!path_.get()) {
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89 handler.SignalError("FILE= is required");
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173
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90 return;
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91 }
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221
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92 int flags{0};
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93 if (status != OpenStatus::Old) {
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94 flags |= O_CREAT;
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95 }
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96 if (status == OpenStatus::New) {
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97 flags |= O_EXCL;
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98 } else if (status == OpenStatus::Replace) {
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99 flags |= O_TRUNC;
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100 }
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101 if (!action) {
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102 // Try to open read/write, back off to read-only on failure
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103 fd_ = ::open(path_.get(), flags | O_RDWR, 0600);
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104 if (fd_ >= 0) {
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105 action = Action::ReadWrite;
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106 } else {
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107 action = Action::Read;
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108 }
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109 }
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110 if (fd_ < 0) {
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111 switch (*action) {
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112 case Action::Read:
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113 flags |= O_RDONLY;
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114 break;
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115 case Action::Write:
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116 flags |= O_WRONLY;
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117 break;
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118 case Action::ReadWrite:
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119 flags |= O_RDWR;
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120 break;
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121 }
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122 fd_ = ::open(path_.get(), flags, 0600);
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123 if (fd_ < 0) {
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124 handler.SignalErrno();
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125 }
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173
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126 }
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127 }
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221
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128 RUNTIME_CHECK(handler, action.has_value());
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173
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129 pending_.reset();
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130 if (position == Position::Append && !RawSeekToEnd()) {
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131 handler.SignalErrno();
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132 }
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133 isTerminal_ = ::isatty(fd_) == 1;
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221
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134 mayRead_ = *action != Action::Write;
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135 mayWrite_ = *action != Action::Read;
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136 if (status == OpenStatus::Old || status == OpenStatus::Unknown) {
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137 knownSize_.reset();
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138 #ifndef _WIN32
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139 struct stat buf;
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140 if (::fstat(fd_, &buf) == 0) {
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141 mayPosition_ = S_ISREG(buf.st_mode);
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142 knownSize_ = buf.st_size;
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143 }
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144 #else // TODO: _WIN32
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145 mayPosition_ = true;
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146 #endif
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147 } else {
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148 knownSize_ = 0;
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149 mayPosition_ = true;
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150 }
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173
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151 }
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152
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153 void OpenFile::Predefine(int fd) {
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154 fd_ = fd;
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155 path_.reset();
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156 pathLength_ = 0;
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157 position_ = 0;
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158 knownSize_.reset();
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159 nextId_ = 0;
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160 pending_.reset();
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221
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161 mayRead_ = fd == 0;
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162 mayWrite_ = fd != 0;
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163 mayPosition_ = false;
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173
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164 }
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165
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166 void OpenFile::Close(CloseStatus status, IoErrorHandler &handler) {
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167 CheckOpen(handler);
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168 pending_.reset();
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169 knownSize_.reset();
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170 switch (status) {
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171 case CloseStatus::Keep:
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172 break;
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173 case CloseStatus::Delete:
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174 if (path_.get()) {
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175 ::unlink(path_.get());
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176 }
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177 break;
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178 }
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179 path_.reset();
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180 if (fd_ >= 0) {
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181 if (::close(fd_) != 0) {
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182 handler.SignalErrno();
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183 }
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184 fd_ = -1;
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185 }
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186 }
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187
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188 std::size_t OpenFile::Read(FileOffset at, char *buffer, std::size_t minBytes,
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189 std::size_t maxBytes, IoErrorHandler &handler) {
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190 if (maxBytes == 0) {
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191 return 0;
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192 }
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193 CheckOpen(handler);
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194 if (!Seek(at, handler)) {
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195 return 0;
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196 }
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221
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197 minBytes = std::min(minBytes, maxBytes);
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173
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198 std::size_t got{0};
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199 while (got < minBytes) {
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200 auto chunk{::read(fd_, buffer + got, maxBytes - got)};
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201 if (chunk == 0) {
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202 break;
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221
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203 } else if (chunk < 0) {
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173
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204 auto err{errno};
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205 if (err != EAGAIN && err != EWOULDBLOCK && err != EINTR) {
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206 handler.SignalError(err);
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207 break;
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208 }
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209 } else {
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210 position_ += chunk;
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211 got += chunk;
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212 }
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213 }
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214 return got;
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215 }
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216
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217 std::size_t OpenFile::Write(FileOffset at, const char *buffer,
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218 std::size_t bytes, IoErrorHandler &handler) {
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219 if (bytes == 0) {
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220 return 0;
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221 }
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222 CheckOpen(handler);
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223 if (!Seek(at, handler)) {
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224 return 0;
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225 }
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226 std::size_t put{0};
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227 while (put < bytes) {
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228 auto chunk{::write(fd_, buffer + put, bytes - put)};
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229 if (chunk >= 0) {
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230 position_ += chunk;
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231 put += chunk;
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232 } else {
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233 auto err{errno};
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234 if (err != EAGAIN && err != EWOULDBLOCK && err != EINTR) {
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235 handler.SignalError(err);
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236 break;
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237 }
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238 }
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239 }
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240 if (knownSize_ && position_ > *knownSize_) {
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241 knownSize_ = position_;
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242 }
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243 return put;
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244 }
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245
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246 inline static int openfile_ftruncate(int fd, OpenFile::FileOffset at) {
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247 #ifdef _WIN32
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248 return !::_chsize(fd, at);
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249 #else
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250 return ::ftruncate(fd, at);
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251 #endif
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252 }
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253
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254 void OpenFile::Truncate(FileOffset at, IoErrorHandler &handler) {
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255 CheckOpen(handler);
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256 if (!knownSize_ || *knownSize_ != at) {
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257 if (openfile_ftruncate(fd_, at) != 0) {
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258 handler.SignalErrno();
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259 }
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260 knownSize_ = at;
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261 }
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262 }
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263
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264 // The operation is performed immediately; the results are saved
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265 // to be claimed by a later WAIT statement.
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266 // TODO: True asynchronicity
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267 int OpenFile::ReadAsynchronously(
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268 FileOffset at, char *buffer, std::size_t bytes, IoErrorHandler &handler) {
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269 CheckOpen(handler);
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270 int iostat{0};
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271 for (std::size_t got{0}; got < bytes;) {
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272 #if _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200809L
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273 auto chunk{::pread(fd_, buffer + got, bytes - got, at)};
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274 #else
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275 auto chunk{Seek(at, handler) ? ::read(fd_, buffer + got, bytes - got) : -1};
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276 #endif
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277 if (chunk == 0) {
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278 iostat = FORTRAN_RUNTIME_IOSTAT_END;
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279 break;
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280 }
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281 if (chunk < 0) {
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282 auto err{errno};
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283 if (err != EAGAIN && err != EWOULDBLOCK && err != EINTR) {
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284 iostat = err;
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285 break;
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286 }
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287 } else {
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288 at += chunk;
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289 got += chunk;
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290 }
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291 }
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292 return PendingResult(handler, iostat);
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293 }
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294
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295 // TODO: True asynchronicity
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296 int OpenFile::WriteAsynchronously(FileOffset at, const char *buffer,
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297 std::size_t bytes, IoErrorHandler &handler) {
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298 CheckOpen(handler);
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299 int iostat{0};
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300 for (std::size_t put{0}; put < bytes;) {
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301 #if _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200809L
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302 auto chunk{::pwrite(fd_, buffer + put, bytes - put, at)};
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303 #else
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304 auto chunk{
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305 Seek(at, handler) ? ::write(fd_, buffer + put, bytes - put) : -1};
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306 #endif
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307 if (chunk >= 0) {
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308 at += chunk;
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309 put += chunk;
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310 } else {
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311 auto err{errno};
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312 if (err != EAGAIN && err != EWOULDBLOCK && err != EINTR) {
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313 iostat = err;
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314 break;
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315 }
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316 }
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317 }
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318 return PendingResult(handler, iostat);
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319 }
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320
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321 void OpenFile::Wait(int id, IoErrorHandler &handler) {
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322 std::optional<int> ioStat;
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323 Pending *prev{nullptr};
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324 for (Pending *p{pending_.get()}; p; p = (prev = p)->next.get()) {
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325 if (p->id == id) {
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326 ioStat = p->ioStat;
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327 if (prev) {
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328 prev->next.reset(p->next.release());
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329 } else {
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330 pending_.reset(p->next.release());
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331 }
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332 break;
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333 }
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334 }
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335 if (ioStat) {
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336 handler.SignalError(*ioStat);
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337 }
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338 }
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339
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340 void OpenFile::WaitAll(IoErrorHandler &handler) {
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341 while (true) {
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342 int ioStat;
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343 if (pending_) {
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344 ioStat = pending_->ioStat;
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345 pending_.reset(pending_->next.release());
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346 } else {
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347 return;
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348 }
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349 handler.SignalError(ioStat);
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350 }
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351 }
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352
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353 void OpenFile::CheckOpen(const Terminator &terminator) {
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354 RUNTIME_CHECK(terminator, fd_ >= 0);
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355 }
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356
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357 bool OpenFile::Seek(FileOffset at, IoErrorHandler &handler) {
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358 if (at == position_) {
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359 return true;
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360 } else if (RawSeek(at)) {
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361 position_ = at;
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362 return true;
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363 } else {
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364 handler.SignalErrno();
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365 return false;
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366 }
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367 }
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368
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369 bool OpenFile::RawSeek(FileOffset at) {
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370 #ifdef _LARGEFILE64_SOURCE
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371 return ::lseek64(fd_, at, SEEK_SET) == at;
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372 #else
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373 return ::lseek(fd_, at, SEEK_SET) == at;
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374 #endif
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375 }
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376
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377 bool OpenFile::RawSeekToEnd() {
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378 #ifdef _LARGEFILE64_SOURCE
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379 std::int64_t at{::lseek64(fd_, 0, SEEK_END)};
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380 #else
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381 std::int64_t at{::lseek(fd_, 0, SEEK_END)};
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382 #endif
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383 if (at >= 0) {
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384 knownSize_ = at;
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385 return true;
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386 } else {
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387 return false;
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388 }
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389 }
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390
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391 int OpenFile::PendingResult(const Terminator &terminator, int iostat) {
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392 int id{nextId_++};
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221
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393 pending_ = New<Pending>{terminator}(id, iostat, std::move(pending_));
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173
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394 return id;
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395 }
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221
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396
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397 bool IsATerminal(int fd) { return ::isatty(fd); }
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398
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399 #ifdef WIN32
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400 // Access flags are normally defined in unistd.h, which unavailable under
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401 // Windows. Instead, define the flags as documented at
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402 // https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/access-waccess
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403 #define F_OK 00
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404 #define W_OK 02
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405 #define R_OK 04
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406 #endif
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407
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408 bool IsExtant(const char *path) { return ::access(path, F_OK) == 0; }
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409 bool MayRead(const char *path) { return ::access(path, R_OK) == 0; }
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410 bool MayWrite(const char *path) { return ::access(path, W_OK) == 0; }
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411 bool MayReadAndWrite(const char *path) {
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412 return ::access(path, R_OK | W_OK) == 0;
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413 }
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173
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414 } // namespace Fortran::runtime::io
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