1 | /* |
1 | /* |
2 | * libeio API header |
2 | * libeio API header |
3 | * |
3 | * |
4 | * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de> |
4 | * Copyright (c) 2007,2008,2009,2010,2011,2012,2015,2016 Marc Alexander Lehmann <libeio@schmorp.de> |
5 | * All rights reserved. |
5 | * All rights reserved. |
6 | * |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
7 | * Redistribution and use in source and binary forms, with or without modifica- |
8 | * tion, are permitted provided that the following conditions are met: |
8 | * tion, are permitted provided that the following conditions are met: |
9 | * |
9 | * |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
10 | * 1. Redistributions of source code must retain the above copyright notice, |
11 | * this list of conditions and the following disclaimer. |
11 | * this list of conditions and the following disclaimer. |
12 | * |
12 | * |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
15 | * documentation and/or other materials provided with the distribution. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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90 | # define EIO_STRUCT_STATVFS struct statvfs |
90 | # define EIO_STRUCT_STATVFS struct statvfs |
91 | #endif |
91 | #endif |
92 | |
92 | |
93 | /* managing working directories */ |
93 | /* managing working directories */ |
94 | |
94 | |
95 | typedef void *eio_wd; |
95 | typedef struct eio_pwd *eio_wd; |
96 | |
96 | |
97 | #define EIO_CWD 0 /* the current working directory of the process, guaranteed to be a null pointer */ |
97 | #define EIO_CWD 0 /* the current working directory of the process, guaranteed to be a null pointer */ |
98 | #define EIO_INVALID_WD ((eio_wd)(int)-1) /* failure return for eio_wd_open */ |
98 | #define EIO_INVALID_WD ((eio_wd)(int)-1) /* failure return for eio_wd_open */ |
99 | |
99 | |
100 | eio_wd eio_wd_open_sync (eio_wd wd, const char *path); |
100 | eio_wd eio_wd_open_sync (eio_wd wd, const char *path); |
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168 | }; |
168 | }; |
169 | |
169 | |
170 | /* eio_fallocate flags */ |
170 | /* eio_fallocate flags */ |
171 | enum |
171 | enum |
172 | { |
172 | { |
173 | EIO_FALLOC_FL_KEEP_SIZE = 1 /* MUST match the value in linux/falloc.h */ |
173 | /* these MUST match the value in linux/falloc.h */ |
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174 | EIO_FALLOC_FL_KEEP_SIZE = 0x01, |
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175 | EIO_FALLOC_FL_PUNCH_HOLE = 0x02, |
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176 | EIO_FALLOC_FL_COLLAPSE_RANGE = 0x08, |
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177 | EIO_FALLOC_FL_ZERO_RANGE = 0x10 |
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178 | }; |
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179 | |
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180 | /* eio_rename flags */ |
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181 | enum |
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182 | { |
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183 | /* these MUST match the value in linux/fs.h */ |
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184 | EIO_RENAME_NOREPLACE = 1 << 0, |
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185 | EIO_RENAME_EXCHANGE = 1 << 1, |
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186 | EIO_RENAME_WHITEOUT = 1 << 2 |
174 | }; |
187 | }; |
175 | |
188 | |
176 | /* timestamps and differences - feel free to use double in your code directly */ |
189 | /* timestamps and differences - feel free to use double in your code directly */ |
177 | typedef double eio_tstamp; |
190 | typedef double eio_tstamp; |
178 | |
191 | |
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181 | { |
194 | { |
182 | EIO_CUSTOM, |
195 | EIO_CUSTOM, |
183 | EIO_WD_OPEN, EIO_WD_CLOSE, |
196 | EIO_WD_OPEN, EIO_WD_CLOSE, |
184 | |
197 | |
185 | EIO_CLOSE, EIO_DUP2, |
198 | EIO_CLOSE, EIO_DUP2, |
186 | EIO_READ, EIO_WRITE, |
199 | EIO_SEEK, EIO_READ, EIO_WRITE, EIO_FCNTL, EIO_IOCTL, |
187 | EIO_READAHEAD, EIO_SENDFILE, |
200 | EIO_READAHEAD, EIO_SENDFILE, |
188 | EIO_FSTAT, EIO_FSTATVFS, |
201 | EIO_FSTAT, EIO_FSTATVFS, |
189 | EIO_FTRUNCATE, EIO_FUTIME, EIO_FCHMOD, EIO_FCHOWN, |
202 | EIO_FTRUNCATE, EIO_FUTIME, EIO_FCHMOD, EIO_FCHOWN, |
190 | EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, EIO_SYNCFS, |
203 | EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, EIO_SYNCFS, |
191 | EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE, |
204 | EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE, |
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193 | EIO_GROUP, EIO_NOP, |
206 | EIO_GROUP, EIO_NOP, |
194 | EIO_BUSY, |
207 | EIO_BUSY, |
195 | |
208 | |
196 | /* these use wd + ptr1, but are emulated */ |
209 | /* these use wd + ptr1, but are emulated */ |
197 | EIO_REALPATH, |
210 | EIO_REALPATH, |
198 | EIO_STATVFS, |
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199 | EIO_READDIR, |
211 | EIO_READDIR, |
200 | |
212 | |
201 | /* all the following requests use wd + ptr1 as path in xxxat functions */ |
213 | /* all the following requests use wd + ptr1 as path in xxxat functions */ |
202 | EIO_OPEN, |
214 | EIO_OPEN, |
203 | EIO_STAT, EIO_LSTAT, |
215 | EIO_STAT, EIO_LSTAT, EIO_STATVFS, |
204 | EIO_TRUNCATE, |
216 | EIO_TRUNCATE, |
205 | EIO_UTIME, |
217 | EIO_UTIME, |
206 | EIO_CHMOD, |
218 | EIO_CHMOD, |
207 | EIO_CHOWN, |
219 | EIO_CHOWN, |
208 | EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
220 | EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
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210 | EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
222 | EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
211 | |
223 | |
212 | EIO_REQ_TYPE_NUM |
224 | EIO_REQ_TYPE_NUM |
213 | }; |
225 | }; |
214 | |
226 | |
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227 | /* seek whence modes */ |
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228 | /* these are guaranteed to hasve the traditional 0, 1, 2 values, */ |
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229 | /* so you might as wlel use those */ |
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230 | enum |
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231 | { |
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232 | EIO_SEEK_SET = 0, |
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233 | EIO_SEEK_CUR = 1, |
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234 | EIO_SEEK_END = 2 |
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235 | }; |
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236 | |
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237 | |
215 | /* mlockall constants */ |
238 | /* mlockall constants */ |
216 | enum |
239 | enum |
217 | { |
240 | { |
218 | EIO_MCL_CURRENT = 1, |
241 | EIO_MCL_CURRENT = 1, |
219 | EIO_MCL_FUTURE = 2, |
242 | EIO_MCL_FUTURE = 2 |
220 | }; |
243 | }; |
221 | |
244 | |
222 | /* request priorities */ |
245 | /* request priorities */ |
223 | |
246 | |
224 | enum { |
247 | enum { |
225 | EIO_PRI_MIN = -4, |
248 | EIO_PRI_MIN = -4, |
226 | EIO_PRI_MAX = 4, |
249 | EIO_PRI_MAX = 4, |
227 | EIO_PRI_DEFAULT = 0, |
250 | EIO_PRI_DEFAULT = 0 |
228 | }; |
251 | }; |
229 | |
252 | |
230 | /* eio request structure */ |
253 | /* eio request structure */ |
231 | /* this structure is mostly read-only */ |
254 | /* this structure is mostly read-only */ |
232 | /* when initialising it, all members must be zero-initialised */ |
255 | /* when initialising it, all members must be zero-initialised */ |
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237 | eio_wd wd; /* all applicable requests: working directory of pathname, old name; wd_open: return wd */ |
260 | eio_wd wd; /* all applicable requests: working directory of pathname, old name; wd_open: return wd */ |
238 | |
261 | |
239 | eio_ssize_t result; /* result of syscall, e.g. result = read (... */ |
262 | eio_ssize_t result; /* result of syscall, e.g. result = read (... */ |
240 | off_t offs; /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */ |
263 | off_t offs; /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */ |
241 | size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */ |
264 | size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */ |
242 | void *ptr1; /* all applicable requests: pathname, old name; readdir: optional eio_dirents */ |
265 | void *ptr1; /* all applicable requests: pathname, old name, readdir: optional eio_dirents */ |
243 | void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */ |
266 | void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */ |
244 | eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
267 | eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
245 | eio_tstamp nv2; /* utime, futime: mtime */ |
268 | eio_tstamp nv2; /* utime, futime: mtime */ |
246 | |
269 | |
247 | int type; /* EIO_xxx constant ETP */ |
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248 | int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */ |
270 | int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */ |
249 | long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range, fallocate: flags */ |
271 | long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, seek: whence, fcntl, ioctl: request, sync_file_range, fallocate, rename: flags */ |
250 | long int3; /* chown, fchown: gid; rename, link: working directory of new name */ |
272 | long int3; /* chown, fchown: gid; rename, link: working directory of new name */ |
251 | int errorno; /* errno value on syscall return */ |
273 | int errorno; /* errno value on syscall return */ |
252 | |
274 | |
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275 | unsigned char flags; /* private */ |
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276 | |
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277 | signed char type;/* EIO_xxx constant ETP */ |
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278 | signed char pri; /* the priority ETP */ |
253 | #if __i386 || __amd64 |
279 | #if __i386 || __amd64 |
254 | unsigned char cancelled; |
280 | unsigned char cancelled; /* ETP */ |
255 | #else |
281 | #else |
256 | sig_atomic_t cancelled; |
282 | sig_atomic_t cancelled; /* ETP */ |
257 | #endif |
283 | #endif |
258 | |
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259 | unsigned char flags; /* private */ |
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260 | signed char pri; /* the priority */ |
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261 | |
284 | |
262 | void *data; |
285 | void *data; |
263 | eio_cb finish; |
286 | eio_cb finish; |
264 | void (*destroy)(eio_req *req); /* called when request no longer needed */ |
287 | void (*destroy)(eio_req *req); /* called when request no longer needed */ |
265 | void (*feed)(eio_req *req); /* only used for group requests */ |
288 | void (*feed)(eio_req *req); /* only used for group requests */ |
266 | |
289 | |
267 | EIO_REQ_MEMBERS |
290 | EIO_REQ_MEMBERS |
268 | |
291 | |
269 | eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ |
292 | eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private ETP */ |
270 | }; |
293 | }; |
271 | |
294 | |
272 | /* _private_ request flags */ |
295 | /* _private_ request flags */ |
273 | enum { |
296 | enum { |
274 | EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */ |
297 | EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */ |
275 | EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */ |
298 | EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */ |
276 | EIO_FLAG_GROUPADD = 0x04 /* some request was added to the group */ |
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277 | }; |
299 | }; |
278 | |
300 | |
279 | /* undocumented/unsupported/private helper */ |
301 | /* undocumented/unsupported/private helper */ |
280 | /*void eio_page_align (void **addr, size_t *length);*/ |
302 | /*void eio_page_align (void **addr, size_t *length);*/ |
281 | |
303 | |
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310 | |
332 | |
311 | /*****************************************************************************/ |
333 | /*****************************************************************************/ |
312 | /* convenience wrappers */ |
334 | /* convenience wrappers */ |
313 | |
335 | |
314 | #ifndef EIO_NO_WRAPPERS |
336 | #ifndef EIO_NO_WRAPPERS |
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337 | eio_req *eio_wd_open (const char *path, int pri, eio_cb cb, void *data); /* result=wd */ |
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338 | eio_req *eio_wd_close (eio_wd wd, int pri, eio_cb cb, void *data); |
315 | eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
339 | eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
316 | eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
340 | eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
317 | eio_req *eio_sync (int pri, eio_cb cb, void *data); |
341 | eio_req *eio_sync (int pri, eio_cb cb, void *data); |
318 | eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
342 | eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
319 | eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
343 | eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
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324 | eio_req *eio_mlockall (int flags, int pri, eio_cb cb, void *data); |
348 | eio_req *eio_mlockall (int flags, int pri, eio_cb cb, void *data); |
325 | eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data); |
349 | eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data); |
326 | eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void *data); |
350 | eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void *data); |
327 | eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
351 | eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
328 | eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
352 | eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
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353 | eio_req *eio_seek (int fd, off_t offset, int whence, int pri, eio_cb cb, void *data); |
329 | eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
354 | eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
330 | eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
355 | eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
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356 | eio_req *eio_fcntl (int fd, int cmd, void *arg, int pri, eio_cb cb, void *data); |
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357 | eio_req *eio_ioctl (int fd, unsigned long request, void *buf, int pri, eio_cb cb, void *data); |
331 | eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
358 | eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
332 | eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
359 | eio_req *eio_fstatvfs (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
333 | eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
360 | eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
334 | eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); |
361 | eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); |
335 | eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); |
362 | eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); |