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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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276
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115 ngx_open_tempfile(u_char *name, ngx_uint_t persistent, ngx_uint_t access)
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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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276
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119 fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR,
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120 access ? access : 0600);
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0
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121
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122 if (fd != -1 && !persistent) {
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123 unlink((const char *) name);
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124 }
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125
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126 return fd;
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127 }
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128
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129
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10
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130 #define NGX_IOVS 8
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131
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110
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132 ssize_t
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133 ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset,
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134 ngx_pool_t *pool)
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0
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135 {
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136 u_char *prev;
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137 size_t size;
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138 ssize_t n;
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10
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139 ngx_array_t vec;
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140 struct iovec *iov, iovs[NGX_IOVS];
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0
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141
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10
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142 /* use pwrite() if there is the only buf in a chain */
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0
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143
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144 if (cl->next == NULL) {
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145 return ngx_write_file(file, cl->buf->pos,
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146 (size_t) (cl->buf->last - cl->buf->pos),
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147 offset);
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148 }
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149
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10
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150 vec.elts = iovs;
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151 vec.size = sizeof(struct iovec);
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126
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152 vec.nalloc = NGX_IOVS;
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10
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153 vec.pool = pool;
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0
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154
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10
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155 do {
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156 prev = NULL;
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157 iov = NULL;
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158 size = 0;
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0
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159
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10
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160 vec.nelts = 0;
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161
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162 /* create the iovec and coalesce the neighbouring bufs */
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0
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163
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10
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164 while (cl && vec.nelts < IOV_MAX) {
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165 if (prev == cl->buf->pos) {
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166 iov->iov_len += cl->buf->last - cl->buf->pos;
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0
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167
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10
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168 } else {
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50
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169 iov = ngx_array_push(&vec);
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170 if (iov == NULL) {
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10
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171 return NGX_ERROR;
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172 }
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173
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174 iov->iov_base = (void *) cl->buf->pos;
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175 iov->iov_len = cl->buf->last - cl->buf->pos;
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176 }
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177
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178 size += cl->buf->last - cl->buf->pos;
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179 prev = cl->buf->last;
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180 cl = cl->next;
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0
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181 }
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182
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10
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183 /* use pwrite() if there is the only iovec buffer */
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0
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184
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185 if (vec.nelts == 1) {
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186 iov = vec.elts;
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187 return ngx_write_file(file, (u_char *) iov[0].iov_base,
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188 iov[0].iov_len, offset);
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189 }
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0
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190
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10
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191 if (file->sys_offset != offset) {
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192 if (lseek(file->fd, offset, SEEK_SET) == -1) {
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193 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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194 "lseek() failed");
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195 return NGX_ERROR;
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196 }
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0
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197
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10
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198 file->sys_offset = offset;
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199 }
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200
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201 n = writev(file->fd, vec.elts, vec.nelts);
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202
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203 if (n == -1) {
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204 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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205 "writev() failed");
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0
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206 return NGX_ERROR;
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207 }
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208
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209 if ((size_t) n != size) {
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210 ngx_log_error(NGX_LOG_CRIT, file->log, 0,
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211 "writev() has written only %z of %uz", n, size);
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212 return NGX_ERROR;
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213 }
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0
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214
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10
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215 file->sys_offset += n;
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216 file->offset += n;
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0
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217
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218 } while (cl);
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0
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219
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220 return n;
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221 }
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222
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223
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110
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224 ngx_int_t
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230
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225 ngx_set_file_time(u_char *name, ngx_fd_t fd, time_t s)
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226 {
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227 struct timeval tv[2];
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228
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229 tv[0].tv_sec = s;
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230 tv[0].tv_usec = 0;
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231 tv[1].tv_sec = s;
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232 tv[1].tv_usec = 0;
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233
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234 if (utimes((char *) name, tv) != -1) {
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235 return NGX_OK;
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236 }
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237
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238 return NGX_ERROR;
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239 }
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240
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241
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242 ngx_int_t
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110
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243 ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
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0
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244 {
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245 dir->dir = opendir((const char *) name->data);
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246
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247 if (dir->dir == NULL) {
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248 return NGX_ERROR;
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249 }
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250
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6
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251 dir->valid_info = 0;
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0
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252
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253 return NGX_OK;
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254 }
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110
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255
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256
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238
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257 ngx_int_t
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258 ngx_open_glob(ngx_glob_t *gl)
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259 {
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372
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260 int n;
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261
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262 n = glob((char *) gl->pattern, GLOB_NOSORT, NULL, &gl->pglob);
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263
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264 if (n == 0) {
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265 return NGX_OK;
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266 }
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267
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400
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268 #ifdef GLOB_NOMATCH
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269
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372
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270 if (n == GLOB_NOMATCH && gl->test) {
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238
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271 return NGX_OK;
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272 }
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273
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400
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274 #endif
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275
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238
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276 return NGX_ERROR;
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277 }
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278
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279
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280 ngx_int_t
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281 ngx_read_glob(ngx_glob_t *gl, ngx_str_t *name)
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282 {
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400
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283 if (gl->n < (size_t) gl->pglob.gl_matchc) {
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238
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284
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285 name->len = (size_t) ngx_strlen(gl->pglob.gl_pathv[gl->n]);
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286 name->data = (u_char *) gl->pglob.gl_pathv[gl->n];
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287 gl->n++;
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288
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289 return NGX_OK;
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290 }
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291
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292 return NGX_DONE;
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293 }
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294
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295
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296 void
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297 ngx_close_glob(ngx_glob_t *gl)
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298 {
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299 globfree(&gl->pglob);
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300 }
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301
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302
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160
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303 ngx_err_t
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304 ngx_trylock_fd(ngx_fd_t fd)
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110
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305 {
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306 struct flock fl;
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307
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160
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308 fl.l_start = 0;
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309 fl.l_len = 0;
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310 fl.l_pid = 0;
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311 fl.l_type = F_WRLCK;
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110
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312 fl.l_whence = SEEK_SET;
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160
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313
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314 if (fcntl(fd, F_SETLK, &fl) == -1) {
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315 return ngx_errno;
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316 }
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317
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318 return 0;
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319 }
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320
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321
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322 ngx_err_t
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323 ngx_lock_fd(ngx_fd_t fd)
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324 {
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325 struct flock fl;
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326
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327 fl.l_start = 0;
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110
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328 fl.l_len = 0;
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329 fl.l_pid = 0;
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330 fl.l_type = F_WRLCK;
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160
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331 fl.l_whence = SEEK_SET;
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110
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332
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160
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333 if (fcntl(fd, F_SETLKW, &fl) == -1) {
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334 return ngx_errno;
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110
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335 }
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336
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160
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337 return 0;
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110
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338 }
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339
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340
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160
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341 ngx_err_t
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342 ngx_unlock_fd(ngx_fd_t fd)
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110
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343 {
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344 struct flock fl;
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345
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160
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346 fl.l_start = 0;
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110
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347 fl.l_len = 0;
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348 fl.l_pid = 0;
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349 fl.l_type = F_UNLCK;
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160
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350 fl.l_whence = SEEK_SET;
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110
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351
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160
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352 if (fcntl(fd, F_SETLK, &fl) == -1) {
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353 return ngx_errno;
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110
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354 }
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355
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160
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356 return 0;
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110
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357 }
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390
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358
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359
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360 #if (NGX_HAVE_O_DIRECT)
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361
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362 ngx_int_t
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363 ngx_directio(ngx_fd_t fd)
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364 {
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365 int flags;
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366
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367 flags = fcntl(fd, F_GETFL);
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368
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369 if (flags == -1) {
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370 return -1;
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371 }
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372
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373 return fcntl(fd, F_SETFL, flags | O_DIRECT);
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374 }
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375
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376 #endif
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