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0
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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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10
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16 "read: %d, %p, %uz, %O", file->fd, buf, size, offset);
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0
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17
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6
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18 #if (NGX_PREAD)
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0
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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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10
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60 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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61 "write: %d, %p, %uz, %O", file->fd, buf, size, offset);
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62
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6
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63 #if (NGX_PWRITE)
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0
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64
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65 n = pwrite(file->fd, buf, size, offset);
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66
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67 if (n == -1) {
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68 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "pwrite() failed");
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69 return NGX_ERROR;
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70 }
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71
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72 if ((size_t) n != size) {
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73 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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10
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74 "pwrite() has written only %z of %uz", n, size);
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0
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75 return NGX_ERROR;
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76 }
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77
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78 #else
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79
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80 if (file->sys_offset != offset) {
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81 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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82 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
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83 return NGX_ERROR;
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84 }
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85
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86 file->sys_offset = offset;
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87 }
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88
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89 n = write(file->fd, buf, size);
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90
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91 if (n == -1) {
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92 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "write() failed");
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93 return NGX_ERROR;
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94 }
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95
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96 if ((size_t) n != size) {
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97 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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10
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98 "write() has written only %z of %uz", n, size);
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0
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99 return NGX_ERROR;
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100 }
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101
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102 file->sys_offset += n;
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103
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104 #endif
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105
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106 file->offset += n;
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107
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108 return n;
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109 }
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110
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111
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112 int ngx_open_tempfile(u_char *name, ngx_uint_t persistent)
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113 {
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114 ngx_fd_t fd;
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115
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116 fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR, 0600);
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117
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118 if (fd != -1 && !persistent) {
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119 unlink((const char *) name);
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120 }
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121
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122 return fd;
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123 }
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124
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125
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10
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126 #define NGX_IOVS 8
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127
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0
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128 ssize_t ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl,
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129 off_t offset, ngx_pool_t *pool)
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130 {
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131 u_char *prev;
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132 size_t size;
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133 ssize_t n;
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134 ngx_err_t err;
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10
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135 ngx_array_t vec;
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136 struct iovec *iov, iovs[NGX_IOVS];
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0
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137
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10
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138 /* use pwrite() if there is the only buf in a chain */
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0
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139
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140 if (cl->next == NULL) {
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141 return ngx_write_file(file, cl->buf->pos,
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142 (size_t) (cl->buf->last - cl->buf->pos),
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143 offset);
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144 }
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145
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10
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146 vec.elts = iovs;
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147 vec.size = sizeof(struct iovec);
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148 vec.nalloc = NGX_IOVS;
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149 vec.pool = pool;
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0
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150
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10
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151 do {
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152 prev = NULL;
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153 iov = NULL;
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154 size = 0;
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0
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155
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10
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156 vec.nelts = 0;
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157
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158 /* create the iovec and coalesce the neighbouring bufs */
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0
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159
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10
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160 while (cl && vec.nelts < IOV_MAX) {
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161 if (prev == cl->buf->pos) {
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162 iov->iov_len += cl->buf->last - cl->buf->pos;
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0
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163
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10
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164 } else {
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165 if (!(iov = ngx_array_push(&vec))) {
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166 return NGX_ERROR;
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167 }
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168
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169 iov->iov_base = (void *) cl->buf->pos;
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170 iov->iov_len = cl->buf->last - cl->buf->pos;
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171 }
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172
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173 size += cl->buf->last - cl->buf->pos;
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174 prev = cl->buf->last;
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175 cl = cl->next;
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0
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176 }
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177
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10
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178 /* use pwrite() if there is the only iovec buffer */
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0
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179
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10
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180 if (vec.nelts == 1) {
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181 iov = vec.elts;
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182 return ngx_write_file(file, (u_char *) iov[0].iov_base,
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183 iov[0].iov_len, offset);
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184 }
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0
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185
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10
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186 if (file->sys_offset != offset) {
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187 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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188 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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189 "lseek() failed");
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190 return NGX_ERROR;
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191 }
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0
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192
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10
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193 file->sys_offset = offset;
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194 }
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195
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196 n = writev(file->fd, vec.elts, vec.nelts);
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197
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198 if (n == -1) {
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199 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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200 "writev() failed");
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0
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201 return NGX_ERROR;
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202 }
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203
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10
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204 if ((size_t) n != size) {
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205 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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206 "writev() has written only %z of %uz", n, size);
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207 return NGX_ERROR;
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208 }
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0
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209
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10
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210 file->sys_offset += n;
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211 file->offset += n;
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0
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212
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10
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213 } while (cl);
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0
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214
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215 return n;
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216 }
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217
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218
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219 int ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
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220 {
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221 dir->dir = opendir((const char *) name->data);
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222
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223 if (dir->dir == NULL) {
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224 return NGX_ERROR;
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225 }
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226
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6
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227 dir->valid_info = 0;
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0
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228
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229 return NGX_OK;
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230 }
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