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