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9 | |
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10 | #include <unistd.h> |
10 | #include <unistd.h> |
11 | #include <fcntl.h> |
11 | #include <fcntl.h> |
12 | #include <signal.h> |
12 | #include <signal.h> |
13 | #include <sched.h> |
13 | #include <sched.h> |
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14 | |
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15 | #ifndef _REENTRANT |
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16 | # define _REENTRANT 1 |
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17 | #endif |
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18 | #include <errno.h> |
14 | |
19 | |
15 | #include <pthread.h> |
20 | #include <pthread.h> |
16 | |
21 | |
17 | typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
22 | typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
18 | typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
23 | typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
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230 | req->type = REQ_QUIT; |
235 | req->type = REQ_QUIT; |
231 | |
236 | |
232 | send_req (req); |
237 | send_req (req); |
233 | } |
238 | } |
234 | |
239 | |
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240 | /* work around various missing functions */ |
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241 | |
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242 | #if !HAVE_PREADWRITE |
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243 | # define pread aio_pread |
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244 | # define pwrite aio_pwrite |
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245 | |
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246 | /* |
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247 | * make our pread/pwrite safe against themselves, but not against |
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248 | * normal read/write by using a mutex. slows down execution a lot, |
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249 | * but that's your problem, not mine. |
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250 | */ |
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251 | static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER; |
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252 | |
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253 | static ssize_t |
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254 | pread (int fd, void *buf, size_t count, off_t offset) |
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255 | { |
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256 | ssize_t res; |
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257 | off_t ooffset; |
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258 | |
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259 | pthread_mutex_lock (&iolock); |
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260 | ooffset = lseek (fd, 0, SEEK_CUR); |
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261 | lseek (fd, offset, SEEK_SET); |
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262 | res = read (fd, buf, count); |
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263 | lseek (fd, ooffset, SEEK_SET); |
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264 | pthread_mutex_unlock (&iolock); |
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265 | |
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266 | return res; |
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267 | } |
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268 | |
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269 | static ssize_t |
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270 | pwrite (int fd, void *buf, size_t count, off_t offset) |
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271 | { |
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272 | ssize_t res; |
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273 | off_t ooffset; |
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274 | |
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275 | pthread_mutex_lock (&iolock); |
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276 | ooffset = lseek (fd, 0, SEEK_CUR); |
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277 | lseek (fd, offset, SEEK_SET); |
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278 | res = write (fd, buf, count); |
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279 | lseek (fd, offset, SEEK_SET); |
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280 | pthread_mutex_unlock (&iolock); |
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281 | |
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282 | return res; |
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283 | } |
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284 | #endif |
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285 | |
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286 | #if !HAVE_FDATASYNC |
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287 | # define fdatasync fsync |
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288 | #endif |
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289 | |
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290 | #if !HAVE_READAHEAD |
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291 | # define readahead aio_readahead |
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292 | |
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293 | static char readahead_buf[4096]; |
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294 | |
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295 | static ssize_t |
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296 | readahead (int fd, off_t offset, size_t count) |
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297 | { |
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298 | while (count > 0) |
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299 | { |
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300 | size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf); |
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301 | |
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302 | pread (fd, readahead_buf, len, offset); |
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303 | offset += len; |
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304 | count -= len; |
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305 | } |
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306 | |
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307 | errno = 0; |
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308 | } |
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309 | #endif |
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310 | |
235 | static void * |
311 | static void * |
236 | aio_proc (void *thr_arg) |
312 | aio_proc (void *thr_arg) |
237 | { |
313 | { |
238 | aio_req req; |
314 | aio_req req; |
239 | int type; |
315 | int type; |
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264 | |
340 | |
265 | type = req->type; |
341 | type = req->type; |
266 | |
342 | |
267 | switch (type) |
343 | switch (type) |
268 | { |
344 | { |
269 | #if HAVE_PREADWRITE |
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270 | case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
345 | case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
271 | case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
346 | case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
272 | #else |
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273 | # error "pread/pwrite cannot be emulated, fix your os" |
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274 | #endif |
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275 | |
347 | |
276 | #if HAVE_READAHEAD |
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277 | case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
348 | case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
278 | #else |
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279 | // TODO: emulate |
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280 | case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break; |
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281 | #endif |
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282 | |
349 | |
283 | case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
350 | case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
284 | case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
351 | case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
285 | case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
352 | case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
286 | |
353 | |
287 | case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
354 | case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
288 | case REQ_CLOSE: req->result = close (req->fd); break; |
355 | case REQ_CLOSE: req->result = close (req->fd); break; |
289 | case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
356 | case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
290 | |
357 | |
291 | case REQ_FDATASYNC: |
358 | case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
292 | #if HAVE_FDATASYNC |
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293 | req->result = fdatasync (req->fd); break; |
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294 | #endif |
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295 | case REQ_FSYNC: req->result = fsync (req->fd); break; |
359 | case REQ_FSYNC: req->result = fsync (req->fd); break; |
296 | |
360 | |
297 | case REQ_QUIT: |
361 | case REQ_QUIT: |
298 | break; |
362 | break; |
299 | |
363 | |