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160
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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #ifndef UV_UNIX_INTERNAL_H_
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23 #define UV_UNIX_INTERNAL_H_
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24
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25 #include "uv-common.h"
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26
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27 #include <assert.h>
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28 #include <limits.h> /* _POSIX_PATH_MAX, PATH_MAX */
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29 #include <stdint.h>
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30 #include <stdlib.h> /* abort */
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31 #include <string.h> /* strrchr */
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32 #include <fcntl.h> /* O_CLOEXEC and O_NONBLOCK, if supported. */
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33 #include <stdio.h>
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34 #include <errno.h>
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35 #include <sys/socket.h>
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36 #include <sys/stat.h>
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37 #include <sys/types.h>
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38 #if defined(__APPLE__) || defined(__DragonFly__) || \
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39 defined(__FreeBSD__) || defined(__NetBSD__)
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40 #include <sys/event.h>
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41 #endif
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42
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43 #define uv__msan_unpoison(p, n) \
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44 do { \
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45 (void) (p); \
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46 (void) (n); \
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47 } while (0)
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48
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49 #if defined(__has_feature)
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50 # if __has_feature(memory_sanitizer)
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51 # include <sanitizer/msan_interface.h>
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52 # undef uv__msan_unpoison
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53 # define uv__msan_unpoison __msan_unpoison
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54 # endif
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55 #endif
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56
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57 #if defined(__STRICT_ANSI__)
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58 # define inline __inline
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59 #endif
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60
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61 #if defined(__MVS__)
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62 # include "os390-syscalls.h"
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63 #endif /* __MVS__ */
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64
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65 #if defined(__sun)
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66 # include <sys/port.h>
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67 # include <port.h>
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68 #endif /* __sun */
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69
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70 #if defined(_AIX)
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71 # define reqevents events
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72 # define rtnevents revents
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73 # include <sys/poll.h>
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74 #else
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75 # include <poll.h>
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76 #endif /* _AIX */
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77
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78 #if defined(__APPLE__)
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79 # include "darwin-syscalls.h"
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80 # if !TARGET_OS_IPHONE
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81 # include <AvailabilityMacros.h>
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82 # endif
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83 #endif
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84
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85 /*
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86 * Define common detection for active Thread Sanitizer
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87 * - clang uses __has_feature(thread_sanitizer)
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88 * - gcc-7+ uses __SANITIZE_THREAD__
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89 */
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90 #if defined(__has_feature)
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91 # if __has_feature(thread_sanitizer)
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92 # define __SANITIZE_THREAD__ 1
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93 # endif
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94 #endif
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95
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96 #if defined(PATH_MAX)
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97 # define UV__PATH_MAX PATH_MAX
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98 #else
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99 # define UV__PATH_MAX 8192
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100 #endif
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101
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102 union uv__sockaddr {
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103 struct sockaddr_in6 in6;
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104 struct sockaddr_in in;
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105 struct sockaddr addr;
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106 };
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107
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108 #define ACCESS_ONCE(type, var) \
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109 (*(volatile type*) &(var))
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110
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111 #define ROUND_UP(a, b) \
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112 ((a) % (b) ? ((a) + (b)) - ((a) % (b)) : (a))
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113
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114 #define UNREACHABLE() \
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115 do { \
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116 assert(0 && "unreachable code"); \
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117 abort(); \
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118 } \
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119 while (0)
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120
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121 #define SAVE_ERRNO(block) \
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122 do { \
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123 int _saved_errno = errno; \
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124 do { block; } while (0); \
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125 errno = _saved_errno; \
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126 } \
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127 while (0)
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128
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129 /* The __clang__ and __INTEL_COMPILER checks are superfluous because they
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130 * define __GNUC__. They are here to convey to you, dear reader, that these
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131 * macros are enabled when compiling with clang or icc.
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132 */
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133 #if defined(__clang__) || \
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134 defined(__GNUC__) || \
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135 defined(__INTEL_COMPILER)
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136 # define UV_UNUSED(declaration) __attribute__((unused)) declaration
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137 #else
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138 # define UV_UNUSED(declaration) declaration
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139 #endif
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140
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141 /* Leans on the fact that, on Linux, POLLRDHUP == EPOLLRDHUP. */
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142 #ifdef POLLRDHUP
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143 # define UV__POLLRDHUP POLLRDHUP
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144 #else
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145 # define UV__POLLRDHUP 0x2000
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146 #endif
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147
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148 #ifdef POLLPRI
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149 # define UV__POLLPRI POLLPRI
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150 #else
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151 # define UV__POLLPRI 0
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152 #endif
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153
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154 #if !defined(O_CLOEXEC) && defined(__FreeBSD__)
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155 /*
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156 * It may be that we are just missing `__POSIX_VISIBLE >= 200809`.
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157 * Try using fixed value const and give up, if it doesn't work
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158 */
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159 # define O_CLOEXEC 0x00100000
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160 #endif
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161
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162 typedef struct uv__stream_queued_fds_s uv__stream_queued_fds_t;
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163
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164 /* loop flags */
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165 enum {
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166 UV_LOOP_BLOCK_SIGPROF = 0x1,
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167 UV_LOOP_REAP_CHILDREN = 0x2,
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168 UV_LOOP_ENABLE_IO_URING_SQPOLL = 0x4
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169 };
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170
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171 /* flags of excluding ifaddr */
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172 enum {
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173 UV__EXCLUDE_IFPHYS,
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174 UV__EXCLUDE_IFADDR
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175 };
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176
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177 typedef enum {
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178 UV_CLOCK_PRECISE = 0, /* Use the highest resolution clock available. */
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179 UV_CLOCK_FAST = 1 /* Use the fastest clock with <= 1ms granularity. */
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180 } uv_clocktype_t;
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181
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182 struct uv__stream_queued_fds_s {
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183 unsigned int size;
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184 unsigned int offset;
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185 int fds[1];
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186 };
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187
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188 #ifdef __linux__
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189 struct uv__statx_timestamp {
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190 int64_t tv_sec;
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191 uint32_t tv_nsec;
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192 int32_t unused0;
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193 };
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194
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195 struct uv__statx {
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196 uint32_t stx_mask;
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197 uint32_t stx_blksize;
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198 uint64_t stx_attributes;
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199 uint32_t stx_nlink;
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200 uint32_t stx_uid;
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201 uint32_t stx_gid;
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202 uint16_t stx_mode;
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203 uint16_t unused0;
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204 uint64_t stx_ino;
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205 uint64_t stx_size;
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206 uint64_t stx_blocks;
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207 uint64_t stx_attributes_mask;
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208 struct uv__statx_timestamp stx_atime;
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209 struct uv__statx_timestamp stx_btime;
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210 struct uv__statx_timestamp stx_ctime;
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211 struct uv__statx_timestamp stx_mtime;
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212 uint32_t stx_rdev_major;
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213 uint32_t stx_rdev_minor;
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214 uint32_t stx_dev_major;
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215 uint32_t stx_dev_minor;
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216 uint64_t unused1[14];
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217 };
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218 #endif /* __linux__ */
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219
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220 #if defined(_AIX) || \
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221 defined(__APPLE__) || \
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222 defined(__DragonFly__) || \
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223 defined(__FreeBSD__) || \
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224 defined(__linux__) || \
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225 defined(__OpenBSD__) || \
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226 defined(__NetBSD__)
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227 #define uv__nonblock uv__nonblock_ioctl
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228 #define UV__NONBLOCK_IS_IOCTL 1
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229 #else
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230 #define uv__nonblock uv__nonblock_fcntl
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231 #define UV__NONBLOCK_IS_IOCTL 0
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232 #endif
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233
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234 /* On Linux, uv__nonblock_fcntl() and uv__nonblock_ioctl() do not commute
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235 * when O_NDELAY is not equal to O_NONBLOCK. Case in point: linux/sparc32
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236 * and linux/sparc64, where O_NDELAY is O_NONBLOCK + another bit.
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237 *
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238 * Libuv uses uv__nonblock_fcntl() directly sometimes so ensure that it
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239 * commutes with uv__nonblock().
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240 */
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241 #if defined(__linux__) && O_NDELAY != O_NONBLOCK
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242 #undef uv__nonblock
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243 #define uv__nonblock uv__nonblock_fcntl
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244 #endif
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245
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246 /* core */
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247 int uv__cloexec(int fd, int set);
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248 int uv__nonblock_ioctl(int fd, int set);
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249 int uv__nonblock_fcntl(int fd, int set);
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250 int uv__close(int fd); /* preserves errno */
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251 int uv__close_nocheckstdio(int fd);
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252 int uv__close_nocancel(int fd);
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253 int uv__socket(int domain, int type, int protocol);
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254 int uv__sock_reuseport(int fd);
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255 ssize_t uv__recvmsg(int fd, struct msghdr *msg, int flags);
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256 void uv__make_close_pending(uv_handle_t* handle);
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257 int uv__getiovmax(void);
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258
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259 void uv__io_init(uv__io_t* w, uv__io_cb cb, int fd);
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260 int uv__io_start(uv_loop_t* loop, uv__io_t* w, unsigned int events);
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261 int uv__io_init_start(uv_loop_t* loop,
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262 uv__io_t* w,
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263 uv__io_cb cb,
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264 int fd,
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265 unsigned int events);
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266 void uv__io_stop(uv_loop_t* loop, uv__io_t* w, unsigned int events);
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267 void uv__io_close(uv_loop_t* loop, uv__io_t* w);
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268 void uv__io_feed(uv_loop_t* loop, uv__io_t* w);
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269 int uv__io_active(const uv__io_t* w, unsigned int events);
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270 int uv__io_check_fd(uv_loop_t* loop, int fd);
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271 void uv__io_poll(uv_loop_t* loop, int timeout); /* in milliseconds or -1 */
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272 int uv__io_fork(uv_loop_t* loop);
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273 int uv__fd_exists(uv_loop_t* loop, int fd);
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274
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275 /* async */
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276 void uv__async_stop(uv_loop_t* loop);
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277 int uv__async_fork(uv_loop_t* loop);
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278
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279
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280 /* loop */
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281 void uv__run_idle(uv_loop_t* loop);
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282 void uv__run_check(uv_loop_t* loop);
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283 void uv__run_prepare(uv_loop_t* loop);
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284
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285 /* stream */
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286 void uv__stream_init(uv_loop_t* loop, uv_stream_t* stream,
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287 uv_handle_type type);
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288 int uv__stream_open(uv_stream_t*, int fd, int flags);
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289 void uv__stream_destroy(uv_stream_t* stream);
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290 #if defined(__APPLE__)
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291 int uv__stream_try_select(uv_stream_t* stream, int* fd);
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292 #endif /* defined(__APPLE__) */
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293 void uv__server_io(uv_loop_t* loop, uv__io_t* w, unsigned int events);
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294 int uv__accept(int sockfd);
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295 int uv__dup2_cloexec(int oldfd, int newfd);
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296 int uv__open_cloexec(const char* path, int flags);
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297 int uv__slurp(const char* filename, char* buf, size_t len);
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298
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299 /* tcp */
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300 int uv__tcp_listen(uv_tcp_t* tcp, int backlog, uv_connection_cb cb);
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301 int uv__tcp_nodelay(int fd, int on);
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302 int uv__tcp_keepalive(int fd, int on, unsigned int delay);
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303
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304 /* tty */
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305 void uv__tty_close(uv_tty_t* handle);
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306
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307 /* pipe */
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308 int uv__pipe_listen(uv_pipe_t* handle, int backlog, uv_connection_cb cb);
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309
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310 /* signal */
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311 void uv__signal_close(uv_signal_t* handle);
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312 void uv__signal_global_once_init(void);
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313 void uv__signal_loop_cleanup(uv_loop_t* loop);
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314 int uv__signal_loop_fork(uv_loop_t* loop);
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315
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316 /* platform specific */
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317 uint64_t uv__hrtime(uv_clocktype_t type);
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318 int uv__kqueue_init(uv_loop_t* loop);
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319 int uv__platform_loop_init(uv_loop_t* loop);
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320 void uv__platform_loop_delete(uv_loop_t* loop);
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321 void uv__platform_invalidate_fd(uv_loop_t* loop, int fd);
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322 int uv__process_init(uv_loop_t* loop);
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323
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324 /* various */
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325 void uv__async_close(uv_async_t* handle);
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326 void uv__check_close(uv_check_t* handle);
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327 void uv__fs_event_close(uv_fs_event_t* handle);
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328 void uv__idle_close(uv_idle_t* handle);
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329 void uv__pipe_close(uv_pipe_t* handle);
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330 void uv__poll_close(uv_poll_t* handle);
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331 void uv__prepare_close(uv_prepare_t* handle);
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332 void uv__process_close(uv_process_t* handle);
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333 void uv__stream_close(uv_stream_t* handle);
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334 void uv__tcp_close(uv_tcp_t* handle);
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335 int uv__thread_setname(const char* name);
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336 int uv__thread_getname(uv_thread_t* tid, char* name, size_t size);
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337 size_t uv__thread_stack_size(void);
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338 void uv__udp_close(uv_udp_t* handle);
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339 void uv__udp_finish_close(uv_udp_t* handle);
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340 FILE* uv__open_file(const char* path);
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341 int uv__search_path(const char* prog, char* buf, size_t* buflen);
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342 void uv__wait_children(uv_loop_t* loop);
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343
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344 /* random */
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345 int uv__random_devurandom(void* buf, size_t buflen);
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346 int uv__random_getrandom(void* buf, size_t buflen);
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347 int uv__random_getentropy(void* buf, size_t buflen);
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348 int uv__random_readpath(const char* path, void* buf, size_t buflen);
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349 int uv__random_sysctl(void* buf, size_t buflen);
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350
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351 /* io_uring */
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352 #ifdef __linux__
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353 int uv__iou_fs_close(uv_loop_t* loop, uv_fs_t* req);
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354 int uv__iou_fs_ftruncate(uv_loop_t* loop, uv_fs_t* req);
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355 int uv__iou_fs_fsync_or_fdatasync(uv_loop_t* loop,
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356 uv_fs_t* req,
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357 uint32_t fsync_flags);
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358 int uv__iou_fs_link(uv_loop_t* loop, uv_fs_t* req);
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359 int uv__iou_fs_mkdir(uv_loop_t* loop, uv_fs_t* req);
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360 int uv__iou_fs_open(uv_loop_t* loop, uv_fs_t* req);
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361 int uv__iou_fs_read_or_write(uv_loop_t* loop,
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362 uv_fs_t* req,
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363 int is_read);
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364 int uv__iou_fs_rename(uv_loop_t* loop, uv_fs_t* req);
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365 int uv__iou_fs_statx(uv_loop_t* loop,
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366 uv_fs_t* req,
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367 int is_fstat,
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368 int is_lstat);
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369 int uv__iou_fs_symlink(uv_loop_t* loop, uv_fs_t* req);
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370 int uv__iou_fs_unlink(uv_loop_t* loop, uv_fs_t* req);
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371 #else
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372 #define uv__iou_fs_close(loop, req) 0
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373 #define uv__iou_fs_ftruncate(loop, req) 0
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374 #define uv__iou_fs_fsync_or_fdatasync(loop, req, fsync_flags) 0
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375 #define uv__iou_fs_link(loop, req) 0
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376 #define uv__iou_fs_mkdir(loop, req) 0
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377 #define uv__iou_fs_open(loop, req) 0
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378 #define uv__iou_fs_read_or_write(loop, req, is_read) 0
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379 #define uv__iou_fs_rename(loop, req) 0
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380 #define uv__iou_fs_statx(loop, req, is_fstat, is_lstat) 0
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381 #define uv__iou_fs_symlink(loop, req) 0
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382 #define uv__iou_fs_unlink(loop, req) 0
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383 #endif
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384
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385 #if defined(__APPLE__)
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386 int uv___stream_fd(const uv_stream_t* handle);
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387 #define uv__stream_fd(handle) (uv___stream_fd((const uv_stream_t*) (handle)))
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388 #else
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389 #define uv__stream_fd(handle) ((handle)->io_watcher.fd)
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390 #endif /* defined(__APPLE__) */
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391
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392 int uv__make_pipe(int fds[2], int flags);
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393
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394 #if defined(__APPLE__)
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395
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396 int uv__fsevents_init(uv_fs_event_t* handle);
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397 int uv__fsevents_close(uv_fs_event_t* handle);
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398 void uv__fsevents_loop_delete(uv_loop_t* loop);
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399
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400 #endif /* defined(__APPLE__) */
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401
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402 UV_UNUSED(static void uv__update_time(uv_loop_t* loop)) {
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403 /* Use a fast time source if available. We only need millisecond precision.
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404 */
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405 loop->time = uv__hrtime(UV_CLOCK_FAST) / 1000000;
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406 }
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407
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408 UV_UNUSED(static char* uv__basename_r(const char* path)) {
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409 char* s;
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410
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411 s = strrchr(path, '/');
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412 if (s == NULL)
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413 return (char*) path;
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414
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415 return s + 1;
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416 }
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417
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418 UV_UNUSED(static int uv__fstat(int fd, struct stat* s)) {
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419 int rc;
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420
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421 rc = fstat(fd, s);
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422 if (rc >= 0)
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423 uv__msan_unpoison(s, sizeof(*s));
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424
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425 return rc;
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426 }
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427
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428 UV_UNUSED(static int uv__lstat(const char* path, struct stat* s)) {
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429 int rc;
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430
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431 rc = lstat(path, s);
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432 if (rc >= 0)
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433 uv__msan_unpoison(s, sizeof(*s));
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434
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435 return rc;
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436 }
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437
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438 UV_UNUSED(static int uv__stat(const char* path, struct stat* s)) {
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439 int rc;
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440
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441 rc = stat(path, s);
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442 if (rc >= 0)
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443 uv__msan_unpoison(s, sizeof(*s));
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444
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445 return rc;
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446 }
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447
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448 #if defined(__linux__)
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449 void uv__fs_post(uv_loop_t* loop, uv_fs_t* req);
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450 ssize_t
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451 uv__fs_copy_file_range(int fd_in,
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452 off_t* off_in,
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453 int fd_out,
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454 off_t* off_out,
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455 size_t len,
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456 unsigned int flags);
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457 int uv__statx(int dirfd,
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458 const char* path,
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459 int flags,
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460 unsigned int mask,
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461 struct uv__statx* statxbuf);
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462 void uv__statx_to_stat(const struct uv__statx* statxbuf, uv_stat_t* buf);
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463 ssize_t uv__getrandom(void* buf, size_t buflen, unsigned flags);
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464 unsigned uv__kernel_version(void);
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465 #endif
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466
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467 typedef int (*uv__peersockfunc)(int, struct sockaddr*, socklen_t*);
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468
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469 int uv__getsockpeername(const uv_handle_t* handle,
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470 uv__peersockfunc func,
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471 struct sockaddr* name,
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472 int* namelen);
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473
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474 #if defined(__sun)
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475 #if !defined(_POSIX_VERSION) || _POSIX_VERSION < 200809L
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476 size_t strnlen(const char* s, size_t maxlen);
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477 #endif
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478 #endif
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479
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480 #if defined(__FreeBSD__)
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481 ssize_t
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482 uv__fs_copy_file_range(int fd_in,
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483 off_t* off_in,
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484 int fd_out,
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485 off_t* off_out,
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486 size_t len,
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487 unsigned int flags);
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488 #endif
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489
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490 #if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 1301000)
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491 #define UV__CPU_AFFINITY_SUPPORTED 1
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492 #else
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493 #define UV__CPU_AFFINITY_SUPPORTED 0
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494 #endif
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495
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496 #ifdef __linux__
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497 int uv__get_constrained_cpu(long long* quota);
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498 #endif
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499
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500 #if defined(__sun) && !defined(__illumos__)
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501 #ifdef SO_FLOW_NAME
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502 /* Since it's impossible to detect the Solaris 11.4 version via OS macros,
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503 * so we check the presence of the socket option SO_FLOW_NAME that was first
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504 * introduced to Solaris 11.4 and define a custom macro for determining 11.4.
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505 */
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506 #define UV__SOLARIS_11_4 (1)
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507 #else
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508 #define UV__SOLARIS_11_4 (0)
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509 #endif
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510 #endif
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511
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512 #if defined(EVFILT_USER) && defined(NOTE_TRIGGER)
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513 /* EVFILT_USER is available since OS X 10.6, DragonFlyBSD 4.0,
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514 * FreeBSD 8.1, and NetBSD 10.0.
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515 *
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516 * Note that even though EVFILT_USER is defined on the current system,
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517 * it may still fail to work at runtime somehow. In that case, we fall
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518 * back to pipe-based signaling.
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519 */
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520 #define UV__KQUEUE_EVFILT_USER 1
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521 /* Magic number of identifier used for EVFILT_USER during runtime detection.
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522 * There are no Google hits for this number when I create it. That way,
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523 * people will be directed here if this number gets printed due to some
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524 * kqueue error and they google for help. */
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525 #define UV__KQUEUE_EVFILT_USER_IDENT 0x1e7e7711
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526 #else
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527 #define UV__KQUEUE_EVFILT_USER 0
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528 #endif
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529
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530 #endif /* UV_UNIX_INTERNAL_H_ */
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