1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
ssize_t ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
{
ssize_t n;
ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
"read: %d, %X, %d, " OFF_T_FMT, file->fd, buf, size, offset);
#if (HAVE_PREAD)
n = pread(file->fd, buf, size, offset);
if (n == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
"pread() failed, file \"%s\"", file->name.data);
return NGX_ERROR;
}
#else
if (file->sys_offset != offset) {
if (lseek(file->fd, offset, SEEK_SET) == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
return NGX_ERROR;
}
file->sys_offset = offset;
}
n = read(file->fd, buf, size);
if (n == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "read() failed");
return NGX_ERROR;
}
file->sys_offset += n;
#endif
file->offset += n;
return n;
}
ssize_t ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
{
ssize_t n;
#if (HAVE_PWRITE)
n = pwrite(file->fd, buf, size, offset);
if (n == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "pwrite() failed");
return NGX_ERROR;
}
if ((size_t) n != size) {
ngx_log_error(NGX_LOG_CRIT, file->log, 0,
"pwrite() has written only %d of %d", n, size);
return NGX_ERROR;
}
#else
if (file->sys_offset != offset) {
if (lseek(file->fd, offset, SEEK_SET) == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
return NGX_ERROR;
}
file->sys_offset = offset;
}
n = write(file->fd, buf, size);
if (n == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "write() failed");
return NGX_ERROR;
}
if ((size_t) n != size) {
ngx_log_error(NGX_LOG_CRIT, file->log, 0,
"write() has written only %d of %d", n, size);
return NGX_ERROR;
}
file->sys_offset += n;
#endif
file->offset += n;
return n;
}
int ngx_open_tempfile(u_char *name, ngx_uint_t persistent)
{
ngx_fd_t fd;
fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR, 0600);
if (fd != -1 && !persistent) {
unlink((const char *) name);
}
return fd;
}
ssize_t ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl,
off_t offset, ngx_pool_t *pool)
{
u_char *prev;
size_t size;
ssize_t n;
struct iovec *iov;
ngx_err_t err;
ngx_array_t io;
/* use pwrite() if there's the only buf in a chain */
if (cl->next == NULL) {
return ngx_write_file(file, cl->buf->pos,
(size_t) (cl->buf->last - cl->buf->pos),
offset);
}
prev = NULL;
iov = NULL;
size = 0;
ngx_init_array(io, pool, 10, sizeof(struct iovec), NGX_ERROR);
/* create the iovec and coalesce the neighbouring bufs */
while (cl) {
if (prev == cl->buf->pos) {
iov->iov_len += cl->buf->last - cl->buf->pos;
} else {
ngx_test_null(iov, ngx_push_array(&io), NGX_ERROR);
iov->iov_base = (void *) cl->buf->pos;
iov->iov_len = cl->buf->last - cl->buf->pos;
}
size += cl->buf->last - cl->buf->pos;
prev = cl->buf->last;
cl = cl->next;
}
/* use pwrite() if there's the only iovec buffer */
if (io.nelts == 1) {
iov = io.elts;
return ngx_write_file(file, (u_char *) iov[0].iov_base, iov[0].iov_len,
offset);
}
if (file->sys_offset != offset) {
if (lseek(file->fd, offset, SEEK_SET) == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "lseek() failed");
return NGX_ERROR;
}
file->sys_offset = offset;
}
n = writev(file->fd, io.elts, io.nelts);
if (n == -1) {
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, "writev() failed");
return NGX_ERROR;
}
if ((size_t) n != size) {
ngx_log_error(NGX_LOG_CRIT, file->log, 0,
"writev() has written only %d of %d", n, size);
return NGX_ERROR;
}
file->sys_offset += n;
file->offset += n;
return n;
}
int ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
{
dir->dir = opendir((const char *) name->data);
if (dir->dir == NULL) {
return NGX_ERROR;
}
dir->info_valid = 0;
return NGX_OK;
}
|