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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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5
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6
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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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10
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11 ssize_t ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
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12 {
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13 ssize_t n;
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14
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15 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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16 "read: %d, %X, %d, " OFF_T_FMT, file->fd, buf, size, offset);
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17
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18 #if (HAVE_PREAD)
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19
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20 n = pread(file->fd, buf, size, offset);
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21
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22 if (n == -1) {
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23 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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24 "pread() failed, file \"%s\"", file->name.data);
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25 return NGX_ERROR;
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26 }
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27
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28 #else
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29
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30 if (file->sys_offset != offset) {
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31 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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32 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
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33 return NGX_ERROR;
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34 }
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35
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36 file->sys_offset = offset;
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37 }
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38
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39 n = read(file->fd, buf, size);
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40
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41 if (n == -1) {
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42 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "read() failed");
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43 return NGX_ERROR;
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44 }
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45
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46 file->sys_offset += n;
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47
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48 #endif
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49
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50 file->offset += n;
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51
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52 return n;
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53 }
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54
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55
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56 ssize_t ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
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57 {
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58 ssize_t n;
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59
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60 #if (HAVE_PWRITE)
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61
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62 n = pwrite(file->fd, buf, size, offset);
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63
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64 if (n == -1) {
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65 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "pwrite() failed");
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66 return NGX_ERROR;
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67 }
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68
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69 if ((size_t) n != size) {
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70 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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71 "pwrite() has written only %d of %d", n, size);
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72 return NGX_ERROR;
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73 }
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74
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75 #else
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76
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77 if (file->sys_offset != offset) {
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78 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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79 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
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80 return NGX_ERROR;
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81 }
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82
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83 file->sys_offset = offset;
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84 }
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85
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86 n = write(file->fd, buf, size);
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87
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88 if (n == -1) {
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89 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "write() failed");
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90 return NGX_ERROR;
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91 }
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92
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93 if ((size_t) n != size) {
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94 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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95 "write() has written only %d of %d", n, size);
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96 return NGX_ERROR;
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97 }
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98
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99 file->sys_offset += n;
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100
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101 #endif
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102
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103 file->offset += n;
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104
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105 return n;
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106 }
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107
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108
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109 int ngx_open_tempfile(u_char *name, ngx_uint_t persistent)
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110 {
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111 ngx_fd_t fd;
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112
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113 fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR, 0600);
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114
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115 if (fd != -1 && !persistent) {
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116 unlink((const char *) name);
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117 }
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118
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119 return fd;
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120 }
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121
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122
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123 ssize_t ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl,
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124 off_t offset, ngx_pool_t *pool)
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125 {
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126 u_char *prev;
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127 size_t size;
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128 ssize_t n;
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129 struct iovec *iov;
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130 ngx_err_t err;
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131 ngx_array_t io;
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132
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133 /* use pwrite() if there's the only buf in a chain */
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134
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135 if (cl->next == NULL) {
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136 return ngx_write_file(file, cl->buf->pos,
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137 (size_t) (cl->buf->last - cl->buf->pos),
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138 offset);
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139 }
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140
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141 prev = NULL;
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142 iov = NULL;
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143 size = 0;
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144
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145 ngx_init_array(io, pool, 10, sizeof(struct iovec), NGX_ERROR);
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146
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147 /* create the iovec and coalesce the neighbouring bufs */
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148
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149 while (cl) {
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150 if (prev == cl->buf->pos) {
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151 iov->iov_len += cl->buf->last - cl->buf->pos;
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152
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153 } else {
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154 ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
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155 iov->iov_base = (void *) cl->buf->pos;
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156 iov->iov_len = cl->buf->last - cl->buf->pos;
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157 }
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158
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159 size += cl->buf->last - cl->buf->pos;
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160 prev = cl->buf->last;
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161 cl = cl->next;
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162 }
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163
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164 /* use pwrite() if there's the only iovec buffer */
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165
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166 if (io.nelts == 1) {
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167 iov = io.elts;
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168 return ngx_write_file(file, (u_char *) iov[0].iov_base, iov[0].iov_len,
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169 offset);
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170 }
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171
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172 if (file->sys_offset != offset) {
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173 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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174 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
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175 return NGX_ERROR;
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176 }
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177
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178 file->sys_offset = offset;
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179 }
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180
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181 n = writev(file->fd, io.elts, io.nelts);
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182
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183 if (n == -1) {
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184 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "writev() failed");
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185 return NGX_ERROR;
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186 }
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187
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188 if ((size_t) n != size) {
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189 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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190 "writev() has written only %d of %d", n, size);
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191 return NGX_ERROR;
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192 }
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193
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194 file->sys_offset += n;
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195 file->offset += n;
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196
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197 return n;
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198 }
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199
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200
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201 int ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
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202 {
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203 dir->dir = opendir((const char *) name->data);
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204
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205 if (dir->dir == NULL) {
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206 return NGX_ERROR;
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207 }
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208
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209 dir->info_valid = 0;
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210
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211 return NGX_OK;
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212 }
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