Commit | Line | Data |
---|---|---|
a323afb2 JG |
1 | #ifndef _BABELTRACE_COMPAT_FCNTL_H |
2 | #define _BABELTRACE_COMPAT_FCNTL_H | |
3 | ||
4 | /* | |
5 | * babeltrace/compat/fcntl.h | |
6 | * | |
7 | * Copyright 2015 (c) - Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
8 | * | |
9 | * fcntl compatibility layer. | |
10 | * | |
11 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
12 | * of this software and associated documentation files (the "Software"), to deal | |
13 | * in the Software without restriction, including without limitation the rights | |
14 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
15 | * copies of the Software, and to permit persons to whom the Software is | |
16 | * furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice shall be included in | |
19 | * all copies or substantial portions of the Software. | |
20 | * | |
21 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
22 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
23 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
24 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
25 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
26 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
27 | * SOFTWARE. | |
28 | */ | |
29 | ||
a323afb2 JG |
30 | #ifdef BABELTRACE_HAVE_POSIX_FALLOCATE |
31 | ||
32 | #include <fcntl.h> | |
33 | ||
34 | static inline | |
35 | int bt_posix_fallocate(int fd, off_t offset, off_t len) | |
36 | { | |
37 | return posix_fallocate(fd, offset, len); | |
38 | } | |
39 | ||
26fdbcef MJ |
40 | #elif defined(__MINGW32__) /* #ifdef BABELTRACE_HAVE_POSIX_FALLOCATE */ |
41 | ||
f23a034a | 42 | #include <stdlib.h> |
26fdbcef MJ |
43 | #include <windows.h> |
44 | #include <fcntl.h> | |
45 | ||
46 | static inline | |
47 | int bt_posix_fallocate(int fd, off_t offset, off_t len) | |
48 | { | |
49 | HANDLE handle; | |
50 | LARGE_INTEGER pos, file_pos, orig_end_offset, range_end; | |
51 | int ret = 0; | |
52 | char zero = 0; | |
53 | DWORD byteswritten; | |
54 | ||
55 | if (offset < 0 || len <= 0) { | |
56 | ret = EINVAL; | |
57 | goto end; | |
58 | } | |
59 | ||
60 | range_end.QuadPart = (__int64) offset + (__int64) len; | |
61 | ||
62 | /* Get a handle from the fd */ | |
63 | handle = (HANDLE) _get_osfhandle(fd); | |
64 | if (handle == INVALID_HANDLE_VALUE) { | |
65 | ret = EBADF; | |
66 | goto end; | |
67 | } | |
68 | ||
69 | /* Get the file original end offset */ | |
70 | ret = GetFileSizeEx(handle, &orig_end_offset); | |
71 | if (ret == 0) { | |
72 | ret = EBADF; | |
73 | goto end; | |
74 | } | |
75 | ||
76 | /* Make sure we don't truncate the file */ | |
77 | if (orig_end_offset.QuadPart >= range_end.QuadPart) { | |
78 | ret = 0; | |
79 | goto end; | |
80 | } | |
81 | ||
82 | /* Get the current file pointer position */ | |
83 | pos.QuadPart = 0; | |
84 | ret = SetFilePointerEx(handle, pos, &file_pos, FILE_CURRENT); | |
85 | if (ret == 0) { | |
86 | ret = EBADF; | |
87 | goto end; | |
88 | } | |
89 | ||
90 | /* Move the file pointer to the new end offset */ | |
91 | ret = SetFilePointerEx(handle, range_end, NULL, FILE_BEGIN); | |
92 | if (ret == 0) { | |
93 | ret = EBADF; | |
94 | goto end; | |
95 | } | |
96 | ||
97 | /* Sets the physical file size to the current position */ | |
98 | ret = SetEndOfFile(handle); | |
99 | if (ret == 0) { | |
100 | ret = EINVAL; | |
101 | goto restore; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Move the file pointer back 1 byte, and write a single 0 at the | |
106 | * last byte of the new end offset, the operating system will zero | |
107 | * fill the file. | |
108 | */ | |
109 | pos.QuadPart = -1; | |
110 | ret = SetFilePointerEx(handle, pos, NULL, FILE_END); | |
111 | if (ret == 0) { | |
112 | ret = EBADF; | |
113 | goto end; | |
114 | } | |
115 | ||
116 | ret = WriteFile(handle, &zero, 1, &byteswritten, NULL); | |
117 | if (ret == 0 || byteswritten != 1) { | |
118 | ret = ENOSPC; | |
119 | } else { | |
120 | ret = 0; | |
121 | } | |
122 | ||
123 | restore: | |
124 | /* Restore the original file pointer position */ | |
125 | if (!SetFilePointerEx(handle, file_pos, NULL, FILE_BEGIN)) { | |
126 | /* We moved the file pointer but failed to restore it. */ | |
f23a034a | 127 | abort(); |
26fdbcef MJ |
128 | } |
129 | ||
130 | end: | |
131 | return ret; | |
132 | } | |
133 | ||
134 | #else | |
a323afb2 JG |
135 | |
136 | #include <sys/types.h> | |
137 | #include <unistd.h> | |
138 | #include <string.h> | |
139 | ||
140 | #define BABELTRACE_FALLOCATE_BUFLEN 256 | |
141 | ||
142 | #ifndef min_t | |
143 | #define min_t(type, a, b) \ | |
144 | ((type) (a) < (type) (b) ? (type) (a) : (type) (b)) | |
145 | #endif | |
146 | ||
147 | static inline | |
148 | int bt_posix_fallocate(int fd, off_t offset, off_t len) | |
149 | { | |
150 | int ret = 0; | |
151 | ssize_t copy_len; | |
152 | char buf[BABELTRACE_FALLOCATE_BUFLEN]; | |
153 | off_t i, file_pos, orig_end_offset, range_end; | |
154 | ||
155 | if (offset < 0 || len < 0) { | |
156 | ret = EINVAL; | |
157 | goto end; | |
158 | } | |
159 | ||
160 | range_end = offset + len; | |
161 | if (range_end < 0) { | |
162 | ret = EFBIG; | |
163 | goto end; | |
164 | } | |
165 | ||
166 | file_pos = lseek(fd, 0, SEEK_CUR); | |
167 | if (file_pos < 0) { | |
168 | ret = errno; | |
169 | goto end; | |
170 | } | |
171 | ||
172 | orig_end_offset = lseek(fd, 0, SEEK_END); | |
173 | if (orig_end_offset < 0) { | |
174 | ret = errno; | |
175 | goto end; | |
176 | } | |
177 | ||
178 | /* Seek back to original position. */ | |
179 | ret = lseek(fd, file_pos, SEEK_SET); | |
180 | if (ret) { | |
181 | ret = errno; | |
182 | goto end; | |
183 | } | |
184 | ||
185 | /* | |
186 | * The file may not need to grow, but we want to ensure the | |
187 | * space has actually been reserved by the file system. First, copy | |
188 | * the "existing" region of the file, then grow the file if needed. | |
189 | */ | |
190 | for (i = file_pos; i < min_t(off_t, range_end, orig_end_offset); | |
191 | i += copy_len) { | |
192 | ssize_t copy_ret; | |
193 | ||
194 | copy_len = min_t(size_t, BABELTRACE_FALLOCATE_BUFLEN, | |
195 | min_t(off_t, range_end - i, | |
196 | orig_end_offset - i)); | |
197 | copy_ret = pread(fd, &buf, copy_len, i); | |
198 | if (copy_ret < copy_len) { | |
199 | /* | |
200 | * The caller must handle any EINTR. | |
201 | * POSIX_FALLOCATE(3) does not mention EINTR. | |
202 | * However, glibc does forward to fallocate() | |
203 | * directly on Linux, which may be interrupted. | |
204 | */ | |
205 | ret = errno; | |
206 | goto end; | |
207 | } | |
208 | ||
209 | copy_ret = pwrite(fd, &buf, copy_len, i); | |
210 | if (copy_ret < copy_len) { | |
211 | /* Same caveat as noted at pread() */ | |
212 | ret = errno; | |
213 | goto end; | |
214 | } | |
215 | } | |
216 | ||
217 | /* Grow file, as necessary. */ | |
218 | memset(&buf, 0, BABELTRACE_FALLOCATE_BUFLEN); | |
219 | for (i = orig_end_offset; i < range_end; i += copy_len) { | |
220 | ssize_t write_ret; | |
221 | ||
222 | copy_len = min_t(size_t, BABELTRACE_FALLOCATE_BUFLEN, | |
223 | range_end - i); | |
224 | write_ret = pwrite(fd, &buf, copy_len, i); | |
225 | if (write_ret < copy_len) { | |
226 | ret = errno; | |
227 | goto end; | |
228 | } | |
229 | } | |
230 | end: | |
231 | return ret; | |
232 | } | |
233 | #endif /* #else #ifdef BABELTRACE_HAVE_POSIX_FALLOCATE */ | |
234 | ||
235 | #endif /* _BABELTRACE_COMPAT_FCNTL_H */ |