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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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110
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11 ssize_t
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12 ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
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0
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13 {
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110
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14 ssize_t n;
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0
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15
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16 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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10
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17 "read: %d, %p, %uz, %O", file->fd, buf, size, offset);
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0
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18
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18
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19 #if (NGX_HAVE_PREAD)
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0
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20
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21 n = pread(file->fd, buf, size, offset);
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22
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23 if (n == -1) {
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24 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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25 "pread() failed, file \"%s\"", file->name.data);
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26 return NGX_ERROR;
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27 }
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28
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29 #else
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30
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31 if (file->sys_offset != offset) {
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32 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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33 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
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34 return NGX_ERROR;
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35 }
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36
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37 file->sys_offset = offset;
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38 }
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39
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40 n = read(file->fd, buf, size);
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41
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42 if (n == -1) {
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43 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "read() failed");
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44 return NGX_ERROR;
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45 }
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46
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47 file->sys_offset += n;
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48
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49 #endif
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50
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51 file->offset += n;
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52
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53 return n;
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54 }
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55
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56
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110
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57 ssize_t
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58 ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
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0
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59 {
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110
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60 ssize_t n;
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0
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61
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10
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62 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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63 "write: %d, %p, %uz, %O", file->fd, buf, size, offset);
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64
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18
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65 #if (NGX_HAVE_PWRITE)
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0
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66
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67 n = pwrite(file->fd, buf, size, offset);
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68
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69 if (n == -1) {
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70 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "pwrite() failed");
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71 return NGX_ERROR;
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72 }
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73
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74 if ((size_t) n != size) {
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75 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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10
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76 "pwrite() has written only %z of %uz", n, size);
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0
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77 return NGX_ERROR;
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78 }
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79
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80 #else
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81
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82 if (file->sys_offset != offset) {
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83 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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84 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
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85 return NGX_ERROR;
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86 }
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87
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88 file->sys_offset = offset;
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89 }
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90
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91 n = write(file->fd, buf, size);
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92
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93 if (n == -1) {
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94 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "write() failed");
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95 return NGX_ERROR;
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96 }
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97
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98 if ((size_t) n != size) {
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99 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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10
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100 "write() has written only %z of %uz", n, size);
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0
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101 return NGX_ERROR;
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102 }
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103
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104 file->sys_offset += n;
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105
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106 #endif
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107
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108 file->offset += n;
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109
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110 return n;
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111 }
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112
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113
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110
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114 ngx_fd_t
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115 ngx_open_tempfile(u_char *name, ngx_uint_t persistent)
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0
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116 {
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117 ngx_fd_t fd;
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118
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119 fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR, 0600);
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120
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121 if (fd != -1 && !persistent) {
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122 unlink((const char *) name);
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123 }
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124
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125 return fd;
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126 }
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127
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128
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10
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129 #define NGX_IOVS 8
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130
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110
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131 ssize_t
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132 ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset,
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133 ngx_pool_t *pool)
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0
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134 {
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135 u_char *prev;
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136 size_t size;
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137 ssize_t n;
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10
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138 ngx_array_t vec;
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139 struct iovec *iov, iovs[NGX_IOVS];
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0
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140
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10
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141 /* use pwrite() if there is the only buf in a chain */
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0
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142
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143 if (cl->next == NULL) {
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144 return ngx_write_file(file, cl->buf->pos,
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145 (size_t) (cl->buf->last - cl->buf->pos),
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146 offset);
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147 }
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148
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10
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149 vec.elts = iovs;
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150 vec.size = sizeof(struct iovec);
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151 vec.nalloc = NGX_IOVS;
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152 vec.pool = pool;
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0
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153
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10
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154 do {
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155 prev = NULL;
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156 iov = NULL;
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157 size = 0;
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0
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158
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10
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159 vec.nelts = 0;
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160
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161 /* create the iovec and coalesce the neighbouring bufs */
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0
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162
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10
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163 while (cl && vec.nelts < IOV_MAX) {
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164 if (prev == cl->buf->pos) {
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165 iov->iov_len += cl->buf->last - cl->buf->pos;
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0
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166
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10
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167 } else {
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50
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168 iov = ngx_array_push(&vec);
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169 if (iov == NULL) {
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10
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170 return NGX_ERROR;
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171 }
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172
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173 iov->iov_base = (void *) cl->buf->pos;
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174 iov->iov_len = cl->buf->last - cl->buf->pos;
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175 }
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176
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177 size += cl->buf->last - cl->buf->pos;
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178 prev = cl->buf->last;
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179 cl = cl->next;
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0
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180 }
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181
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10
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182 /* use pwrite() if there is the only iovec buffer */
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0
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183
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10
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184 if (vec.nelts == 1) {
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185 iov = vec.elts;
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186 return ngx_write_file(file, (u_char *) iov[0].iov_base,
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187 iov[0].iov_len, offset);
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188 }
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0
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189
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10
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190 if (file->sys_offset != offset) {
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191 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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192 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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193 "lseek() failed");
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194 return NGX_ERROR;
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195 }
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0
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196
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10
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197 file->sys_offset = offset;
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198 }
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199
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200 n = writev(file->fd, vec.elts, vec.nelts);
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201
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202 if (n == -1) {
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203 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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204 "writev() failed");
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0
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205 return NGX_ERROR;
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206 }
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207
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10
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208 if ((size_t) n != size) {
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209 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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210 "writev() has written only %z of %uz", n, size);
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211 return NGX_ERROR;
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212 }
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0
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213
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10
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214 file->sys_offset += n;
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215 file->offset += n;
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0
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216
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10
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217 } while (cl);
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0
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218
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219 return n;
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220 }
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221
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222
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110
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223 ngx_int_t
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224 ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
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0
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225 {
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226 dir->dir = opendir((const char *) name->data);
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227
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228 if (dir->dir == NULL) {
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229 return NGX_ERROR;
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230 }
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231
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6
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232 dir->valid_info = 0;
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0
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233
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234 return NGX_OK;
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235 }
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110
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236
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237
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238 ngx_int_t
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239 ngx_lock_file(ngx_file_t *file)
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240 {
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241 ngx_err_t err;
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242 struct flock fl;
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243
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244 fl.l_whence = SEEK_SET;
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245 fl.l_len = 0;
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246 fl.l_pid = 0;
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247 fl.l_type = F_WRLCK;
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248 fl.l_start = 0;
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249
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250 if (fcntl(file->fd, F_SETLK, &fl) == -1) {
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251 err = ngx_errno;
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252
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253 if (err == NGX_EAGAIN) {
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254 return NGX_BUSY;
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255 }
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256
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257 ngx_log_error(NGX_LOG_ALERT, file->log, err,
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258 "fcntl(%s, F_SETLK, F_WRLCK) failed", file->name.data);
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259
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260 return NGX_ERROR;
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261 }
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262
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263 return NGX_OK;
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264 }
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265
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266
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267 ngx_int_t
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268 ngx_unlock_file(ngx_file_t *file)
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269 {
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270 ngx_err_t err;
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271 struct flock fl;
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272
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273 fl.l_whence = SEEK_SET;
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274 fl.l_len = 0;
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275 fl.l_pid = 0;
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276 fl.l_type = F_UNLCK;
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277 fl.l_start = 0;
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278
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279 if (fcntl(file->fd, F_SETLK, &fl) == -1) {
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280 err = ngx_errno;
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281
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282 if (err == NGX_EAGAIN) {
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283 return NGX_BUSY;
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284 }
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285
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286 ngx_log_error(NGX_LOG_ALERT, file->log, err,
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287 "fcntl(%s, F_SETLK, F_UNLCK) failed", file->name.data);
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288
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289 return NGX_ERROR;
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290 }
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291
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292 return NGX_OK;
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293 }
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