1 |
#define PERL_NO_GET_CONTEXT |
2 |
|
3 |
#include "EXTERN.h" |
4 |
#include "perl.h" |
5 |
#include "XSUB.h" |
6 |
|
7 |
#include <sys/types.h> |
8 |
#include <sys/stat.h> |
9 |
#include <unistd.h> |
10 |
#include <fcntl.h> |
11 |
#include <signal.h> |
12 |
#include <sched.h> |
13 |
|
14 |
typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
15 |
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
16 |
typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
17 |
|
18 |
#define STACKSIZE (128 * sizeof (long)) /* yeah */ |
19 |
|
20 |
enum { |
21 |
REQ_QUIT, |
22 |
REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, |
23 |
REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK |
24 |
}; |
25 |
|
26 |
typedef struct { |
27 |
char stack[STACKSIZE]; |
28 |
} aio_thread; |
29 |
|
30 |
typedef struct aio_cb { |
31 |
struct aio_cb *next; |
32 |
|
33 |
int type; |
34 |
aio_thread *thread; |
35 |
|
36 |
int fd; |
37 |
off_t offset; |
38 |
size_t length; |
39 |
ssize_t result; |
40 |
mode_t mode; /* open */ |
41 |
int errorno; |
42 |
SV *data, *callback; |
43 |
void *dataptr; |
44 |
STRLEN dataoffset; |
45 |
|
46 |
Stat_t *statdata; |
47 |
} aio_cb; |
48 |
|
49 |
typedef aio_cb *aio_req; |
50 |
|
51 |
static int started; |
52 |
static int nreqs; |
53 |
static int reqpipe[2], respipe[2]; |
54 |
|
55 |
static aio_req qs, qe; /* queue start, queue end */ |
56 |
|
57 |
static int aio_proc(void *arg); |
58 |
|
59 |
static void |
60 |
start_thread (void) |
61 |
{ |
62 |
aio_thread *thr; |
63 |
|
64 |
New (0, thr, 1, aio_thread); |
65 |
|
66 |
if (clone (aio_proc, |
67 |
&(thr->stack[STACKSIZE - sizeof (long)]), |
68 |
CLONE_VM|CLONE_FS|CLONE_FILES, |
69 |
thr) >= 0) |
70 |
started++; |
71 |
else |
72 |
Safefree (thr); |
73 |
} |
74 |
|
75 |
static void |
76 |
send_reqs (void) |
77 |
{ |
78 |
/* this write is atomic */ |
79 |
while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs) |
80 |
{ |
81 |
qs = qs->next; |
82 |
if (!qs) qe = 0; |
83 |
} |
84 |
} |
85 |
|
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static void |
87 |
send_req (aio_req req) |
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{ |
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nreqs++; |
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req->next = 0; |
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|
92 |
if (qe) |
93 |
{ |
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qe->next = req; |
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qe = req; |
96 |
} |
97 |
else |
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qe = qs = req; |
99 |
|
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send_reqs (); |
101 |
} |
102 |
|
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static void |
104 |
end_thread (void) |
105 |
{ |
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aio_req req; |
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New (0, req, 1, aio_cb); |
108 |
req->type = REQ_QUIT; |
109 |
|
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send_req (req); |
111 |
} |
112 |
|
113 |
static void |
114 |
read_write (pTHX_ |
115 |
int dowrite, int fd, off_t offset, size_t length, |
116 |
SV *data, STRLEN dataoffset, SV *callback) |
117 |
{ |
118 |
aio_req req; |
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STRLEN svlen; |
120 |
char *svptr = SvPV (data, svlen); |
121 |
|
122 |
SvUPGRADE (data, SVt_PV); |
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SvPOK_on (data); |
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|
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if (dataoffset < 0) |
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dataoffset += svlen; |
127 |
|
128 |
if (dataoffset < 0 || dataoffset > svlen) |
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croak ("data offset outside of string"); |
130 |
|
131 |
if (dowrite) |
132 |
{ |
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/* write: check length and adjust. */ |
134 |
if (length < 0 || length + dataoffset > svlen) |
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length = svlen - dataoffset; |
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} |
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else |
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{ |
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/* read: grow scalar as necessary */ |
140 |
svptr = SvGROW (data, length + dataoffset); |
141 |
} |
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|
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if (length < 0) |
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croak ("length must not be negative"); |
145 |
|
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Newz (0, req, 1, aio_cb); |
147 |
|
148 |
if (!req) |
149 |
croak ("out of memory during aio_req allocation"); |
150 |
|
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req->type = dowrite ? REQ_WRITE : REQ_READ; |
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req->fd = fd; |
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req->offset = offset; |
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req->length = length; |
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req->data = SvREFCNT_inc (data); |
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req->dataptr = (char *)svptr + dataoffset; |
157 |
req->callback = SvREFCNT_inc (callback); |
158 |
|
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send_req (req); |
160 |
} |
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|
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static void |
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poll_wait () |
164 |
{ |
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fd_set rfd; |
166 |
FD_ZERO(&rfd); |
167 |
FD_SET(respipe[0], &rfd); |
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|
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select (respipe[0] + 1, &rfd, 0, 0, 0); |
170 |
} |
171 |
|
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static int |
173 |
poll_cb (pTHX) |
174 |
{ |
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dSP; |
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int count = 0; |
177 |
aio_req req; |
178 |
|
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while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
180 |
{ |
181 |
nreqs--; |
182 |
|
183 |
if (req->type == REQ_QUIT) |
184 |
{ |
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Safefree (req->thread); |
186 |
started--; |
187 |
} |
188 |
else |
189 |
{ |
190 |
int errorno = errno; |
191 |
errno = req->errorno; |
192 |
|
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if (req->type == REQ_READ) |
194 |
SvCUR_set (req->data, req->dataoffset |
195 |
+ req->result > 0 ? req->result : 0); |
196 |
|
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if (req->data) |
198 |
SvREFCNT_dec (req->data); |
199 |
|
200 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
201 |
{ |
202 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
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PL_laststatval = req->result; |
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PL_statcache = *(req->statdata); |
205 |
|
206 |
Safefree (req->statdata); |
207 |
} |
208 |
|
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PUSHMARK (SP); |
210 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
211 |
PUTBACK; |
212 |
call_sv (req->callback, G_VOID); |
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SPAGAIN; |
214 |
|
215 |
if (req->callback) |
216 |
SvREFCNT_dec (req->callback); |
217 |
|
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errno = errorno; |
219 |
count++; |
220 |
} |
221 |
|
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Safefree (req); |
223 |
} |
224 |
|
225 |
if (qs) |
226 |
send_reqs (); |
227 |
|
228 |
return count; |
229 |
} |
230 |
|
231 |
static sigset_t fullsigset; |
232 |
|
233 |
#undef errno |
234 |
#include <asm/unistd.h> |
235 |
#include <sys/prctl.h> |
236 |
|
237 |
#define COPY_STATDATA \ |
238 |
req->statdata->st_dev = statdata.st_dev; \ |
239 |
req->statdata->st_ino = statdata.st_ino; \ |
240 |
req->statdata->st_mode = statdata.st_mode; \ |
241 |
req->statdata->st_nlink = statdata.st_nlink; \ |
242 |
req->statdata->st_uid = statdata.st_uid; \ |
243 |
req->statdata->st_gid = statdata.st_gid; \ |
244 |
req->statdata->st_rdev = statdata.st_rdev; \ |
245 |
req->statdata->st_size = statdata.st_size; \ |
246 |
req->statdata->st_atime = statdata.st_atime; \ |
247 |
req->statdata->st_mtime = statdata.st_mtime; \ |
248 |
req->statdata->st_ctime = statdata.st_ctime; \ |
249 |
req->statdata->st_blksize = statdata.st_blksize; \ |
250 |
req->statdata->st_blocks = statdata.st_blocks; \ |
251 |
|
252 |
static int |
253 |
aio_proc (void *thr_arg) |
254 |
{ |
255 |
aio_thread *thr = thr_arg; |
256 |
aio_req req; |
257 |
int errno; |
258 |
|
259 |
/* this is very much kernel-specific :(:(:( */ |
260 |
/* we rely on gcc's ability to create closures. */ |
261 |
_syscall3(int,read,int,fd,char *,buf,size_t,count) |
262 |
_syscall3(int,write,int,fd,char *,buf,size_t,count) |
263 |
|
264 |
_syscall3(int,open,char *,pathname,int,flags,mode_t,mode) |
265 |
_syscall1(int,close,int,fd) |
266 |
|
267 |
#ifdef __NR_pread64 |
268 |
_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi) |
269 |
_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi) |
270 |
#elif __NR_pread |
271 |
_syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset) |
272 |
_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset) |
273 |
#else |
274 |
# error "neither pread nor pread64 defined" |
275 |
#endif |
276 |
|
277 |
|
278 |
#ifdef __NR_stat64 |
279 |
_syscall2(int,stat64, const char *, filename, struct stat64 *, buf) |
280 |
_syscall2(int,lstat64, const char *, filename, struct stat64 *, buf) |
281 |
_syscall2(int,fstat64, int, fd, struct stat64 *, buf) |
282 |
#elif __NR_stat |
283 |
_syscall2(int,stat, const char *, filename, struct stat *, buf) |
284 |
_syscall2(int,lstat, const char *, filename, struct stat *, buf) |
285 |
_syscall2(int,fstat, int, fd, struct stat *, buf) |
286 |
#else |
287 |
# error "neither stat64 nor stat defined" |
288 |
#endif |
289 |
|
290 |
_syscall1(int,unlink, char *, filename); |
291 |
|
292 |
sigprocmask (SIG_SETMASK, &fullsigset, 0); |
293 |
prctl (PR_SET_PDEATHSIG, SIGKILL); |
294 |
|
295 |
/* then loop */ |
296 |
while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
297 |
{ |
298 |
req->thread = thr; |
299 |
errno = 0; /* strictly unnecessary */ |
300 |
|
301 |
switch (req->type) |
302 |
{ |
303 |
#ifdef __NR_pread64 |
304 |
case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break; |
305 |
case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break; |
306 |
#else |
307 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
308 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
309 |
#endif |
310 |
#ifdef __NR_stat64 |
311 |
struct stat64 statdata; |
312 |
case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break; |
313 |
case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break; |
314 |
case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break; |
315 |
#else |
316 |
struct stat statdata; |
317 |
case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break; |
318 |
case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break; |
319 |
case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break; |
320 |
#endif |
321 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
322 |
case REQ_CLOSE: req->result = close (req->fd); break; |
323 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
324 |
|
325 |
case REQ_QUIT: |
326 |
default: |
327 |
write (respipe[1], (void *)&req, sizeof (req)); |
328 |
return 0; |
329 |
} |
330 |
|
331 |
req->errorno = errno; |
332 |
write (respipe[1], (void *)&req, sizeof (req)); |
333 |
} |
334 |
|
335 |
return 0; |
336 |
} |
337 |
|
338 |
MODULE = Linux::AIO PACKAGE = Linux::AIO |
339 |
|
340 |
BOOT: |
341 |
{ |
342 |
sigfillset (&fullsigset); |
343 |
sigdelset (&fullsigset, SIGTERM); |
344 |
sigdelset (&fullsigset, SIGQUIT); |
345 |
sigdelset (&fullsigset, SIGABRT); |
346 |
sigdelset (&fullsigset, SIGINT); |
347 |
|
348 |
if (pipe (reqpipe) || pipe (respipe)) |
349 |
croak ("unable to initialize request or result pipe"); |
350 |
|
351 |
if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK)) |
352 |
croak ("cannot set result pipe to nonblocking mode"); |
353 |
|
354 |
if (fcntl (respipe[0], F_SETFL, O_NONBLOCK)) |
355 |
croak ("cannot set result pipe to nonblocking mode"); |
356 |
} |
357 |
|
358 |
void |
359 |
min_parallel(nthreads) |
360 |
int nthreads |
361 |
PROTOTYPE: $ |
362 |
CODE: |
363 |
while (nthreads > started) |
364 |
start_thread (); |
365 |
|
366 |
void |
367 |
max_parallel(nthreads) |
368 |
int nthreads |
369 |
PROTOTYPE: $ |
370 |
CODE: |
371 |
int cur = started; |
372 |
while (cur > nthreads) |
373 |
{ |
374 |
end_thread (); |
375 |
cur--; |
376 |
} |
377 |
|
378 |
while (started > nthreads) |
379 |
{ |
380 |
poll_wait (); |
381 |
poll_cb (aTHX); |
382 |
} |
383 |
|
384 |
void |
385 |
aio_open(pathname,flags,mode,callback) |
386 |
SV * pathname |
387 |
int flags |
388 |
int mode |
389 |
SV * callback |
390 |
PROTOTYPE: $$$$ |
391 |
CODE: |
392 |
aio_req req; |
393 |
|
394 |
Newz (0, req, 1, aio_cb); |
395 |
|
396 |
if (!req) |
397 |
croak ("out of memory during aio_req allocation"); |
398 |
|
399 |
req->type = REQ_OPEN; |
400 |
req->data = newSVsv (pathname); |
401 |
req->dataptr = SvPV_nolen (req->data); |
402 |
req->fd = flags; |
403 |
req->mode = mode; |
404 |
req->callback = SvREFCNT_inc (callback); |
405 |
|
406 |
send_req (req); |
407 |
|
408 |
void |
409 |
aio_close(fh,callback) |
410 |
InputStream fh |
411 |
SV * callback |
412 |
PROTOTYPE: $$ |
413 |
CODE: |
414 |
aio_req req; |
415 |
|
416 |
Newz (0, req, 1, aio_cb); |
417 |
|
418 |
if (!req) |
419 |
croak ("out of memory during aio_req allocation"); |
420 |
|
421 |
req->type = REQ_CLOSE; |
422 |
req->fd = PerlIO_fileno (fh); |
423 |
req->callback = SvREFCNT_inc (callback); |
424 |
|
425 |
send_req (req); |
426 |
|
427 |
void |
428 |
aio_read(fh,offset,length,data,dataoffset,callback) |
429 |
InputStream fh |
430 |
UV offset |
431 |
IV length |
432 |
SV * data |
433 |
IV dataoffset |
434 |
SV * callback |
435 |
PROTOTYPE: $$$$$$ |
436 |
CODE: |
437 |
read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
438 |
|
439 |
void |
440 |
aio_write(fh,offset,length,data,dataoffset,callback) |
441 |
OutputStream fh |
442 |
UV offset |
443 |
IV length |
444 |
SV * data |
445 |
IV dataoffset |
446 |
SV * callback |
447 |
PROTOTYPE: $$$$$$ |
448 |
CODE: |
449 |
read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
450 |
|
451 |
void |
452 |
aio_stat(fh_or_path,callback) |
453 |
SV * fh_or_path |
454 |
SV * callback |
455 |
PROTOTYPE: $$ |
456 |
ALIAS: |
457 |
aio_lstat = 1 |
458 |
CODE: |
459 |
aio_req req; |
460 |
|
461 |
Newz (0, req, 1, aio_cb); |
462 |
|
463 |
if (!req) |
464 |
croak ("out of memory during aio_req allocation"); |
465 |
|
466 |
New (0, req->statdata, 1, Stat_t); |
467 |
|
468 |
if (!req->statdata) |
469 |
croak ("out of memory during aio_req->statdata allocation"); |
470 |
|
471 |
if (SvPOK (fh_or_path)) |
472 |
{ |
473 |
req->type = ix ? REQ_LSTAT : REQ_STAT; |
474 |
req->data = newSVsv (fh_or_path); |
475 |
req->dataptr = SvPV_nolen (req->data); |
476 |
} |
477 |
else |
478 |
{ |
479 |
req->type = REQ_FSTAT; |
480 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
481 |
} |
482 |
|
483 |
req->callback = SvREFCNT_inc (callback); |
484 |
|
485 |
send_req (req); |
486 |
|
487 |
void |
488 |
aio_unlink(pathname,callback) |
489 |
SV * pathname |
490 |
SV * callback |
491 |
PROTOTYPE: $$ |
492 |
CODE: |
493 |
aio_req req; |
494 |
|
495 |
Newz (0, req, 1, aio_cb); |
496 |
|
497 |
if (!req) |
498 |
croak ("out of memory during aio_req allocation"); |
499 |
|
500 |
req->type = REQ_UNLINK; |
501 |
req->data = newSVsv (pathname); |
502 |
req->dataptr = SvPV_nolen (req->data); |
503 |
req->callback = SvREFCNT_inc (callback); |
504 |
|
505 |
send_req (req); |
506 |
|
507 |
int |
508 |
poll_fileno() |
509 |
PROTOTYPE: |
510 |
CODE: |
511 |
RETVAL = respipe[0]; |
512 |
OUTPUT: |
513 |
RETVAL |
514 |
|
515 |
int |
516 |
poll_cb(...) |
517 |
PROTOTYPE: |
518 |
CODE: |
519 |
RETVAL = poll_cb (aTHX); |
520 |
OUTPUT: |
521 |
RETVAL |
522 |
|
523 |
int |
524 |
nreqs() |
525 |
PROTOTYPE: |
526 |
CODE: |
527 |
RETVAL = nreqs; |
528 |
OUTPUT: |
529 |
RETVAL |
530 |
|