Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_files.c @ 4311:45272aab5eea
Unlock of shared memory zones on process crash.
If process exited abnormally while holding lock on some shared memory zone -
unlock it. It may be not safe thing to do (as crash with lock held may
result in corrupted shared memory structure, and other processes will
subsequently crash while trying to access shared data), therefore complain
loudly if unlock succeeds.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Wed, 23 Nov 2011 14:09:19 +0000 |
| parents | 11e47bf300db |
| children | d620f497c50f |
| rev | line source |
|---|---|
|
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 |
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11 #if (NGX_HAVE_FILE_AIO) |
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12 |
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13 ngx_uint_t ngx_file_aio = 1; |
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14 |
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15 #endif |
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16 |
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17 |
| 561 | 18 ssize_t |
| 19 ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset) | |
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20 { |
| 561 | 21 ssize_t n; |
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22 |
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23 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, |
| 461 | 24 "read: %d, %p, %uz, %O", file->fd, buf, size, offset); |
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| 469 | 26 #if (NGX_HAVE_PREAD) |
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27 |
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28 n = pread(file->fd, buf, size, offset); |
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29 |
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30 if (n == -1) { |
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31 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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32 "pread() \"%s\" failed", file->name.data); |
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33 return NGX_ERROR; |
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34 } |
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35 |
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36 #else |
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37 |
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38 if (file->sys_offset != offset) { |
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39 if (lseek(file->fd, offset, SEEK_SET) == -1) { |
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40 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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41 "lseek() \"%s\" failed", file->name.data); |
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42 return NGX_ERROR; |
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43 } |
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44 |
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45 file->sys_offset = offset; |
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46 } |
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47 |
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48 n = read(file->fd, buf, size); |
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49 |
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50 if (n == -1) { |
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51 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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52 "read() \"%s\" failed", file->name.data); |
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53 return NGX_ERROR; |
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54 } |
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55 |
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56 file->sys_offset += n; |
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57 |
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58 #endif |
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59 |
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60 file->offset += n; |
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61 |
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62 return n; |
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63 } |
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64 |
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65 |
| 561 | 66 ssize_t |
| 67 ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset) | |
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68 { |
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69 ssize_t n, written; |
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70 |
| 461 | 71 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, |
| 72 "write: %d, %p, %uz, %O", file->fd, buf, size, offset); | |
| 73 | |
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74 written = 0; |
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75 |
| 469 | 76 #if (NGX_HAVE_PWRITE) |
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77 |
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78 for ( ;; ) { |
| 3657 | 79 n = pwrite(file->fd, buf + written, size, offset); |
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80 |
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81 if (n == -1) { |
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82 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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83 "pwrite() \"%s\" failed", file->name.data); |
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84 return NGX_ERROR; |
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85 } |
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86 |
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87 file->offset += n; |
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88 written += n; |
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89 |
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90 if ((size_t) n == size) { |
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91 return written; |
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92 } |
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93 |
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94 offset += n; |
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95 size -= n; |
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96 } |
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97 |
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98 #else |
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99 |
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100 if (file->sys_offset != offset) { |
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101 if (lseek(file->fd, offset, SEEK_SET) == -1) { |
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102 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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103 "lseek() \"%s\" failed", file->name.data); |
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104 return NGX_ERROR; |
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105 } |
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106 |
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107 file->sys_offset = offset; |
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108 } |
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109 |
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110 for ( ;; ) { |
| 3657 | 111 n = write(file->fd, buf + written, size); |
|
182
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112 |
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113 if (n == -1) { |
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114 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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115 "write() \"%s\" failed", file->name.data); |
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116 return NGX_ERROR; |
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117 } |
|
182
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118 |
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119 file->offset += n; |
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120 written += n; |
|
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121 |
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122 if ((size_t) n == size) { |
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123 return written; |
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124 } |
|
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125 |
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126 size -= n; |
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127 } |
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128 #endif |
|
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129 } |
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130 |
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131 |
| 561 | 132 ngx_fd_t |
| 1046 | 133 ngx_open_tempfile(u_char *name, ngx_uint_t persistent, ngx_uint_t access) |
|
303
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134 { |
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135 ngx_fd_t fd; |
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136 |
| 1046 | 137 fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR, |
| 138 access ? access : 0600); | |
|
303
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139 |
|
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140 if (fd != -1 && !persistent) { |
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141 unlink((const char *) name); |
|
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142 } |
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143 |
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144 return fd; |
|
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145 } |
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146 |
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147 |
| 461 | 148 #define NGX_IOVS 8 |
| 149 | |
| 561 | 150 ssize_t |
| 151 ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset, | |
| 152 ngx_pool_t *pool) | |
|
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153 { |
|
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154 u_char *prev; |
|
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155 size_t size; |
|
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156 ssize_t total, n; |
| 461 | 157 ngx_array_t vec; |
| 158 struct iovec *iov, iovs[NGX_IOVS]; | |
|
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159 |
| 461 | 160 /* use pwrite() if there is the only buf in a chain */ |
|
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161 |
|
170
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162 if (cl->next == NULL) { |
|
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163 return ngx_write_file(file, cl->buf->pos, |
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164 (size_t) (cl->buf->last - cl->buf->pos), |
|
194
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165 offset); |
|
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166 } |
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167 |
|
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168 total = 0; |
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169 |
| 461 | 170 vec.elts = iovs; |
| 171 vec.size = sizeof(struct iovec); | |
| 577 | 172 vec.nalloc = NGX_IOVS; |
| 461 | 173 vec.pool = pool; |
|
170
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174 |
| 461 | 175 do { |
| 176 prev = NULL; | |
| 177 iov = NULL; | |
| 178 size = 0; | |
|
170
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179 |
| 461 | 180 vec.nelts = 0; |
| 181 | |
| 182 /* create the iovec and coalesce the neighbouring bufs */ | |
|
170
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183 |
| 461 | 184 while (cl && vec.nelts < IOV_MAX) { |
| 185 if (prev == cl->buf->pos) { | |
| 186 iov->iov_len += cl->buf->last - cl->buf->pos; | |
|
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187 |
| 461 | 188 } else { |
| 501 | 189 iov = ngx_array_push(&vec); |
| 190 if (iov == NULL) { | |
| 461 | 191 return NGX_ERROR; |
| 192 } | |
| 193 | |
| 194 iov->iov_base = (void *) cl->buf->pos; | |
| 195 iov->iov_len = cl->buf->last - cl->buf->pos; | |
| 196 } | |
| 197 | |
| 198 size += cl->buf->last - cl->buf->pos; | |
| 199 prev = cl->buf->last; | |
| 200 cl = cl->next; | |
|
170
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201 } |
|
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202 |
| 461 | 203 /* use pwrite() if there is the only iovec buffer */ |
|
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204 |
| 461 | 205 if (vec.nelts == 1) { |
| 206 iov = vec.elts; | |
|
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207 |
|
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208 n = ngx_write_file(file, (u_char *) iov[0].iov_base, |
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209 iov[0].iov_len, offset); |
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210 |
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211 if (n == NGX_ERROR) { |
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212 return n; |
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213 } |
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214 |
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215 return total + n; |
| 461 | 216 } |
|
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217 |
| 461 | 218 if (file->sys_offset != offset) { |
| 219 if (lseek(file->fd, offset, SEEK_SET) == -1) { | |
| 220 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, | |
|
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221 "lseek() \"%s\" failed", file->name.data); |
| 461 | 222 return NGX_ERROR; |
| 223 } | |
|
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224 |
| 461 | 225 file->sys_offset = offset; |
| 226 } | |
| 227 | |
| 228 n = writev(file->fd, vec.elts, vec.nelts); | |
| 229 | |
| 230 if (n == -1) { | |
| 231 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, | |
|
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232 "writev() \"%s\" failed", file->name.data); |
|
154
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233 return NGX_ERROR; |
|
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234 } |
|
191
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235 |
| 461 | 236 if ((size_t) n != size) { |
| 237 ngx_log_error(NGX_LOG_CRIT, file->log, 0, | |
|
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238 "writev() \"%s\" has written only %z of %uz", |
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239 file->name.data, n, size); |
| 461 | 240 return NGX_ERROR; |
| 241 } | |
|
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242 |
| 461 | 243 file->sys_offset += n; |
| 244 file->offset += n; | |
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245 total += n; |
|
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246 |
| 461 | 247 } while (cl); |
|
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248 |
|
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249 return total; |
|
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250 } |
|
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251 |
|
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252 |
| 561 | 253 ngx_int_t |
| 681 | 254 ngx_set_file_time(u_char *name, ngx_fd_t fd, time_t s) |
| 255 { | |
| 256 struct timeval tv[2]; | |
| 257 | |
|
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258 tv[0].tv_sec = ngx_time(); |
| 681 | 259 tv[0].tv_usec = 0; |
| 260 tv[1].tv_sec = s; | |
| 261 tv[1].tv_usec = 0; | |
| 262 | |
| 263 if (utimes((char *) name, tv) != -1) { | |
| 264 return NGX_OK; | |
| 265 } | |
| 266 | |
| 267 return NGX_ERROR; | |
| 268 } | |
| 269 | |
| 270 | |
| 271 ngx_int_t | |
| 3651 | 272 ngx_create_file_mapping(ngx_file_mapping_t *fm) |
| 273 { | |
| 274 fm->fd = ngx_open_file(fm->name, NGX_FILE_RDWR, NGX_FILE_TRUNCATE, | |
| 275 NGX_FILE_DEFAULT_ACCESS); | |
| 276 if (fm->fd == NGX_INVALID_FILE) { | |
| 277 ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno, | |
| 278 ngx_open_file_n " \"%s\" failed", fm->name); | |
| 279 return NGX_ERROR; | |
| 280 } | |
| 281 | |
| 282 if (ftruncate(fm->fd, fm->size) == -1) { | |
| 283 ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno, | |
| 284 "ftruncate() \"%s\" failed", fm->name); | |
| 285 goto failed; | |
| 286 } | |
| 287 | |
| 288 fm->addr = mmap(NULL, fm->size, PROT_READ|PROT_WRITE, MAP_SHARED, | |
| 289 fm->fd, 0); | |
| 290 if (fm->addr != MAP_FAILED) { | |
| 291 return NGX_OK; | |
| 292 } | |
| 293 | |
| 294 ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno, | |
| 295 "mmap(%uz) \"%s\" failed", fm->size, fm->name); | |
| 296 | |
| 297 failed: | |
| 298 | |
| 299 if (ngx_close_file(fm->fd) == NGX_FILE_ERROR) { | |
| 300 ngx_log_error(NGX_LOG_ALERT, fm->log, ngx_errno, | |
| 301 ngx_close_file_n " \"%s\" failed", fm->name); | |
| 302 } | |
| 303 | |
| 304 return NGX_ERROR; | |
| 305 } | |
| 306 | |
| 307 | |
| 308 void | |
| 309 ngx_close_file_mapping(ngx_file_mapping_t *fm) | |
| 310 { | |
| 311 if (munmap(fm->addr, fm->size) == -1) { | |
| 312 ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno, | |
| 313 "munmap(%uz) \"%s\" failed", fm->size, fm->name); | |
| 314 } | |
| 315 | |
| 316 if (ngx_close_file(fm->fd) == NGX_FILE_ERROR) { | |
| 317 ngx_log_error(NGX_LOG_ALERT, fm->log, ngx_errno, | |
| 318 ngx_close_file_n " \"%s\" failed", fm->name); | |
| 319 } | |
| 320 } | |
| 321 | |
| 322 | |
| 323 ngx_int_t | |
| 561 | 324 ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir) |
|
186
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325 { |
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326 dir->dir = opendir((const char *) name->data); |
|
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327 |
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328 if (dir->dir == NULL) { |
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329 return NGX_ERROR; |
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330 } |
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331 |
| 457 | 332 dir->valid_info = 0; |
|
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333 |
|
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334 return NGX_OK; |
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335 } |
| 561 | 336 |
| 337 | |
| 727 | 338 ngx_int_t |
|
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339 ngx_read_dir(ngx_dir_t *dir) |
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340 { |
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341 dir->de = readdir(dir->dir); |
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342 |
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343 if (dir->de) { |
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344 #if (NGX_HAVE_D_TYPE) |
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345 dir->type = dir->de->d_type; |
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346 #else |
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347 dir->type = 0; |
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348 #endif |
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349 return NGX_OK; |
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350 } |
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351 |
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352 return NGX_ERROR; |
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353 } |
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354 |
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355 |
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356 ngx_int_t |
| 727 | 357 ngx_open_glob(ngx_glob_t *gl) |
| 358 { | |
| 1980 | 359 int n; |
| 360 | |
| 361 n = glob((char *) gl->pattern, GLOB_NOSORT, NULL, &gl->pglob); | |
| 362 | |
| 363 if (n == 0) { | |
| 364 return NGX_OK; | |
| 365 } | |
| 366 | |
|
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367 #ifdef GLOB_NOMATCH |
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368 |
| 1980 | 369 if (n == GLOB_NOMATCH && gl->test) { |
| 727 | 370 return NGX_OK; |
| 371 } | |
| 372 | |
|
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373 #endif |
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374 |
| 727 | 375 return NGX_ERROR; |
| 376 } | |
| 377 | |
| 378 | |
| 379 ngx_int_t | |
| 380 ngx_read_glob(ngx_glob_t *gl, ngx_str_t *name) | |
| 381 { | |
|
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382 size_t count; |
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383 |
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384 #ifdef GLOB_NOMATCH |
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385 count = (size_t) gl->pglob.gl_pathc; |
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386 #else |
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387 count = (size_t) gl->pglob.gl_matchc; |
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388 #endif |
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389 |
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390 if (gl->n < count) { |
| 727 | 391 |
| 392 name->len = (size_t) ngx_strlen(gl->pglob.gl_pathv[gl->n]); | |
| 393 name->data = (u_char *) gl->pglob.gl_pathv[gl->n]; | |
| 394 gl->n++; | |
| 395 | |
| 396 return NGX_OK; | |
| 397 } | |
| 398 | |
| 399 return NGX_DONE; | |
| 400 } | |
| 401 | |
| 402 | |
| 403 void | |
| 404 ngx_close_glob(ngx_glob_t *gl) | |
| 405 { | |
| 406 globfree(&gl->pglob); | |
| 407 } | |
| 408 | |
| 409 | |
| 611 | 410 ngx_err_t |
| 411 ngx_trylock_fd(ngx_fd_t fd) | |
| 561 | 412 { |
| 413 struct flock fl; | |
| 414 | |
| 611 | 415 fl.l_start = 0; |
| 416 fl.l_len = 0; | |
| 417 fl.l_pid = 0; | |
| 418 fl.l_type = F_WRLCK; | |
| 561 | 419 fl.l_whence = SEEK_SET; |
| 611 | 420 |
| 421 if (fcntl(fd, F_SETLK, &fl) == -1) { | |
| 422 return ngx_errno; | |
| 423 } | |
| 424 | |
| 425 return 0; | |
| 426 } | |
| 427 | |
| 428 | |
| 429 ngx_err_t | |
| 430 ngx_lock_fd(ngx_fd_t fd) | |
| 431 { | |
| 432 struct flock fl; | |
| 433 | |
| 434 fl.l_start = 0; | |
| 561 | 435 fl.l_len = 0; |
| 436 fl.l_pid = 0; | |
| 437 fl.l_type = F_WRLCK; | |
| 611 | 438 fl.l_whence = SEEK_SET; |
| 561 | 439 |
| 611 | 440 if (fcntl(fd, F_SETLKW, &fl) == -1) { |
| 441 return ngx_errno; | |
| 561 | 442 } |
| 443 | |
| 611 | 444 return 0; |
| 561 | 445 } |
| 446 | |
| 447 | |
| 611 | 448 ngx_err_t |
| 449 ngx_unlock_fd(ngx_fd_t fd) | |
| 561 | 450 { |
| 451 struct flock fl; | |
| 452 | |
| 611 | 453 fl.l_start = 0; |
| 561 | 454 fl.l_len = 0; |
| 455 fl.l_pid = 0; | |
| 456 fl.l_type = F_UNLCK; | |
| 611 | 457 fl.l_whence = SEEK_SET; |
| 561 | 458 |
| 611 | 459 if (fcntl(fd, F_SETLK, &fl) == -1) { |
| 460 return ngx_errno; | |
| 561 | 461 } |
| 462 | |
| 611 | 463 return 0; |
| 561 | 464 } |
| 2129 | 465 |
| 466 | |
|
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467 #if (NGX_HAVE_POSIX_FADVISE) && !(NGX_HAVE_F_READAHEAD) |
|
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468 |
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469 ngx_int_t |
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470 ngx_read_ahead(ngx_fd_t fd, size_t n) |
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471 { |
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472 int err; |
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473 |
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474 err = posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL); |
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475 |
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476 if (err == 0) { |
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477 return 0; |
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478 } |
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479 |
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480 ngx_set_errno(err); |
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481 return NGX_FILE_ERROR; |
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482 } |
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483 |
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484 #endif |
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485 |
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486 |
| 2129 | 487 #if (NGX_HAVE_O_DIRECT) |
| 488 | |
| 489 ngx_int_t | |
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490 ngx_directio_on(ngx_fd_t fd) |
| 2129 | 491 { |
| 492 int flags; | |
| 493 | |
| 494 flags = fcntl(fd, F_GETFL); | |
| 495 | |
| 496 if (flags == -1) { | |
|
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497 return NGX_FILE_ERROR; |
| 2129 | 498 } |
| 499 | |
| 500 return fcntl(fd, F_SETFL, flags | O_DIRECT); | |
| 501 } | |
| 502 | |
|
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503 |
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504 ngx_int_t |
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505 ngx_directio_off(ngx_fd_t fd) |
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506 { |
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507 int flags; |
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508 |
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509 flags = fcntl(fd, F_GETFL); |
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510 |
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511 if (flags == -1) { |
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512 return NGX_FILE_ERROR; |
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513 } |
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514 |
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515 return fcntl(fd, F_SETFL, flags & ~O_DIRECT); |
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516 } |
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517 |
| 2129 | 518 #endif |
| 2615 | 519 |
| 520 | |
| 521 #if (NGX_HAVE_STATFS) | |
| 522 | |
| 523 size_t | |
| 524 ngx_fs_bsize(u_char *name) | |
| 525 { | |
| 526 struct statfs fs; | |
| 527 | |
| 528 if (statfs((char *) name, &fs) == -1) { | |
| 529 return 512; | |
| 530 } | |
| 531 | |
| 532 if ((fs.f_bsize % 512) != 0) { | |
| 533 return 512; | |
| 534 } | |
| 535 | |
| 536 return (size_t) fs.f_bsize; | |
| 537 } | |
| 538 | |
| 539 #elif (NGX_HAVE_STATVFS) | |
| 540 | |
| 541 size_t | |
| 542 ngx_fs_bsize(u_char *name) | |
| 543 { | |
| 544 struct statvfs fs; | |
| 545 | |
| 546 if (statvfs((char *) name, &fs) == -1) { | |
| 547 return 512; | |
| 548 } | |
| 549 | |
| 550 if ((fs.f_frsize % 512) != 0) { | |
| 551 return 512; | |
| 552 } | |
| 553 | |
| 554 return (size_t) fs.f_frsize; | |
| 555 } | |
| 556 | |
| 557 #else | |
| 558 | |
| 559 size_t | |
| 560 ngx_fs_bsize(u_char *name) | |
| 561 { | |
| 562 return 512; | |
| 563 } | |
| 564 | |
| 565 #endif |