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annotate src/os/unix/ngx_errno.c @ 7785:c43a2e8fdf7e

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Introduced strerrordesc_np() support. The strerrordesc_np() function, introduced in glibc 2.32, provides an async-signal-safe way to obtain error messages. This makes it possible to avoid copying error messages.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 01 Mar 2021 20:00:45 +0300
parents 8cc5b0365ee5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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3 * Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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11
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12 static ngx_str_t ngx_unknown_error = ngx_string("Unknown error");
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13
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14
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15 #if (NGX_HAVE_STRERRORDESC_NP)
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16
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17 /*
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18 * The strerrordesc_np() function, introduced in glibc 2.32, is
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19 * async-signal-safe. This makes it possible to use it directly,
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20 * without copying error messages.
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21 */
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22
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23
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24 u_char *
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25 ngx_strerror(ngx_err_t err, u_char *errstr, size_t size)
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26 {
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27 size_t len;
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28 const char *msg;
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29
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30 msg = strerrordesc_np(err);
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31
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32 if (msg == NULL) {
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33 msg = (char *) ngx_unknown_error.data;
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34 len = ngx_unknown_error.len;
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35
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36 } else {
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37 len = ngx_strlen(msg);
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38 }
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39
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40 size = ngx_min(size, len);
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41
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42 return ngx_cpymem(errstr, msg, size);
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43 }
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44
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45
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46 ngx_int_t
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47 ngx_strerror_init(void)
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48 {
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49 return NGX_OK;
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50 }
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51
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52
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53 #else
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54
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55 /*
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56 * The strerror() messages are copied because:
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57 *
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58 * 1) strerror() and strerror_r() functions are not Async-Signal-Safe,
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59 * therefore, they cannot be used in signal handlers;
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60 *
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61 * 2) a direct sys_errlist[] array may be used instead of these functions,
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62 * but Linux linker warns about its usage:
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63 *
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64 * warning: `sys_errlist' is deprecated; use `strerror' or `strerror_r' instead
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65 * warning: `sys_nerr' is deprecated; use `strerror' or `strerror_r' instead
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66 *
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67 * causing false bug reports.
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68 */
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70
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71 static ngx_str_t *ngx_sys_errlist;
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72 static ngx_err_t ngx_first_error;
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73 static ngx_err_t ngx_last_error;
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74
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75
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76 u_char *
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77 ngx_strerror(ngx_err_t err, u_char *errstr, size_t size)
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78 {
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79 ngx_str_t *msg;
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80
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81 if (err >= ngx_first_error && err < ngx_last_error) {
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82 msg = &ngx_sys_errlist[err - ngx_first_error];
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83
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84 } else {
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85 msg = &ngx_unknown_error;
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86 }
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87
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88 size = ngx_min(size, msg->len);
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89
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90 return ngx_cpymem(errstr, msg->data, size);
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91 }
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92
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93
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94 ngx_int_t
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95 ngx_strerror_init(void)
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96 {
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97 char *msg;
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98 u_char *p;
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99 size_t len;
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100 ngx_err_t err;
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101
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102 #if (NGX_SYS_NERR)
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103 ngx_first_error = 0;
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104 ngx_last_error = NGX_SYS_NERR;
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105
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106 #elif (EPERM > 1000 && EPERM < 0x7fffffff - 1000)
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107
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108 /*
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109 * If number of errors is not known, and EPERM error code has large
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110 * but reasonable value, guess possible error codes based on the error
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111 * messages returned by strerror(), starting from EPERM. Notably,
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112 * this covers GNU/Hurd, where errors start at 0x40000001.
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113 */
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114
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115 for (err = EPERM; err > EPERM - 1000; err--) {
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116 ngx_set_errno(0);
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117 msg = strerror(err);
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118
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119 if (errno == EINVAL
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120 || msg == NULL
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121 || strncmp(msg, "Unknown error", 13) == 0)
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122 {
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123 continue;
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124 }
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125
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126 ngx_first_error = err;
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127 }
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128
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129 for (err = EPERM; err < EPERM + 1000; err++) {
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130 ngx_set_errno(0);
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131 msg = strerror(err);
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132
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133 if (errno == EINVAL
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134 || msg == NULL
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135 || strncmp(msg, "Unknown error", 13) == 0)
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136 {
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137 continue;
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138 }
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139
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140 ngx_last_error = err + 1;
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141 }
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142
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143 #else
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144
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145 /*
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146 * If number of errors is not known, guess it based on the error
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147 * messages returned by strerror().
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148 */
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149
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150 ngx_first_error = 0;
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151
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152 for (err = 0; err < 1000; err++) {
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153 ngx_set_errno(0);
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154 msg = strerror(err);
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155
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156 if (errno == EINVAL
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157 || msg == NULL
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158 || strncmp(msg, "Unknown error", 13) == 0)
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159 {
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160 continue;
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161 }
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162
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163 ngx_last_error = err + 1;
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164 }
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165
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166 #endif
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167
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168 /*
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169 * ngx_strerror() is not ready to work at this stage, therefore,
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170 * malloc() is used and possible errors are logged using strerror().
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171 */
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172
7784
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173 len = (ngx_last_error - ngx_first_error) * sizeof(ngx_str_t);
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174
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175 ngx_sys_errlist = malloc(len);
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176 if (ngx_sys_errlist == NULL) {
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177 goto failed;
256
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178 }
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179
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180 for (err = ngx_first_error; err < ngx_last_error; err++) {
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181 msg = strerror(err);
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182
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183 if (msg == NULL) {
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184 ngx_sys_errlist[err - ngx_first_error] = ngx_unknown_error;
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185 continue;
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186 }
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187
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188 len = ngx_strlen(msg);
256
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189
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190 p = malloc(len);
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191 if (p == NULL) {
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192 goto failed;
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193 }
256
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diff changeset
194
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195 ngx_memcpy(p, msg, len);
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196 ngx_sys_errlist[err - ngx_first_error].len = len;
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197 ngx_sys_errlist[err - ngx_first_error].data = p;
256
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diff changeset
198 }
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diff changeset
199
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200 return NGX_OK;
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diff changeset
201
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diff changeset
202 failed:
256
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diff changeset
203
3787
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diff changeset
204 err = errno;
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diff changeset
205 ngx_log_stderr(0, "malloc(%uz) failed (%d: %s)", len, err, strerror(err));
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diff changeset
206
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diff changeset
207 return NGX_ERROR;
256
8e39cab6abd5 nginx-0.0.2-2004-02-10-19:23:38 import
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diff changeset
208 }
7785
c43a2e8fdf7e Introduced strerrordesc_np() support.
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209
c43a2e8fdf7e Introduced strerrordesc_np() support.
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diff changeset
210 #endif