| 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 |
#include <endian.h> |
| 14 |
|
| 15 |
typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
| 16 |
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
| 17 |
typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
| 18 |
|
| 19 |
#if __i386 || __amd64 |
| 20 |
# define STACKSIZE ( 256 * sizeof (long)) |
| 21 |
#elif __ia64 |
| 22 |
# define STACKSIZE (8192 * sizeof (long)) |
| 23 |
#else |
| 24 |
# define STACKSIZE ( 512 * sizeof (long)) |
| 25 |
#endif |
| 26 |
|
| 27 |
enum { |
| 28 |
REQ_QUIT, |
| 29 |
REQ_OPEN, REQ_CLOSE, |
| 30 |
REQ_READ, REQ_WRITE, REQ_READAHEAD, |
| 31 |
REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK, |
| 32 |
REQ_FSYNC, REQ_FDATASYNC, |
| 33 |
}; |
| 34 |
|
| 35 |
typedef struct { |
| 36 |
char stack[STACKSIZE]; |
| 37 |
} aio_thread; |
| 38 |
|
| 39 |
typedef struct aio_cb { |
| 40 |
struct aio_cb *next; |
| 41 |
|
| 42 |
int type; |
| 43 |
aio_thread *thread; |
| 44 |
|
| 45 |
int fd; |
| 46 |
off_t offset; |
| 47 |
size_t length; |
| 48 |
ssize_t result; |
| 49 |
mode_t mode; /* open */ |
| 50 |
int errorno; |
| 51 |
SV *data, *callback; |
| 52 |
void *dataptr; |
| 53 |
STRLEN dataoffset; |
| 54 |
|
| 55 |
Stat_t *statdata; |
| 56 |
} aio_cb; |
| 57 |
|
| 58 |
typedef aio_cb *aio_req; |
| 59 |
|
| 60 |
static int started; |
| 61 |
static int nreqs; |
| 62 |
static int reqpipe[2], respipe[2]; |
| 63 |
|
| 64 |
static aio_req qs, qe; /* queue start, queue end */ |
| 65 |
|
| 66 |
static int aio_proc(void *arg); |
| 67 |
|
| 68 |
static void |
| 69 |
start_thread (void) |
| 70 |
{ |
| 71 |
aio_thread *thr; |
| 72 |
|
| 73 |
New (0, thr, 1, aio_thread); |
| 74 |
|
| 75 |
if (clone (aio_proc, |
| 76 |
&(thr->stack[STACKSIZE - 16]), |
| 77 |
CLONE_VM|CLONE_FS|CLONE_FILES, |
| 78 |
thr) >= 0) |
| 79 |
started++; |
| 80 |
else |
| 81 |
Safefree (thr); |
| 82 |
} |
| 83 |
|
| 84 |
static void |
| 85 |
send_reqs (void) |
| 86 |
{ |
| 87 |
/* this write is atomic */ |
| 88 |
while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs) |
| 89 |
{ |
| 90 |
qs = qs->next; |
| 91 |
if (!qs) qe = 0; |
| 92 |
} |
| 93 |
} |
| 94 |
|
| 95 |
static void |
| 96 |
send_req (aio_req req) |
| 97 |
{ |
| 98 |
nreqs++; |
| 99 |
req->next = 0; |
| 100 |
|
| 101 |
if (qe) |
| 102 |
{ |
| 103 |
qe->next = req; |
| 104 |
qe = req; |
| 105 |
} |
| 106 |
else |
| 107 |
qe = qs = req; |
| 108 |
|
| 109 |
send_reqs (); |
| 110 |
} |
| 111 |
|
| 112 |
static void |
| 113 |
end_thread (void) |
| 114 |
{ |
| 115 |
aio_req req; |
| 116 |
New (0, req, 1, aio_cb); |
| 117 |
req->type = REQ_QUIT; |
| 118 |
|
| 119 |
send_req (req); |
| 120 |
} |
| 121 |
|
| 122 |
static void |
| 123 |
read_write (pTHX_ |
| 124 |
int dowrite, int fd, off_t offset, size_t length, |
| 125 |
SV *data, STRLEN dataoffset, SV *callback) |
| 126 |
{ |
| 127 |
aio_req req; |
| 128 |
STRLEN svlen; |
| 129 |
char *svptr = SvPV (data, svlen); |
| 130 |
|
| 131 |
SvUPGRADE (data, SVt_PV); |
| 132 |
SvPOK_on (data); |
| 133 |
|
| 134 |
if (dataoffset < 0) |
| 135 |
dataoffset += svlen; |
| 136 |
|
| 137 |
if (dataoffset < 0 || dataoffset > svlen) |
| 138 |
croak ("data offset outside of string"); |
| 139 |
|
| 140 |
if (dowrite) |
| 141 |
{ |
| 142 |
/* write: check length and adjust. */ |
| 143 |
if (length < 0 || length + dataoffset > svlen) |
| 144 |
length = svlen - dataoffset; |
| 145 |
} |
| 146 |
else |
| 147 |
{ |
| 148 |
/* read: grow scalar as necessary */ |
| 149 |
svptr = SvGROW (data, length + dataoffset); |
| 150 |
} |
| 151 |
|
| 152 |
if (length < 0) |
| 153 |
croak ("length must not be negative"); |
| 154 |
|
| 155 |
Newz (0, req, 1, aio_cb); |
| 156 |
|
| 157 |
if (!req) |
| 158 |
croak ("out of memory during aio_req allocation"); |
| 159 |
|
| 160 |
req->type = dowrite ? REQ_WRITE : REQ_READ; |
| 161 |
req->fd = fd; |
| 162 |
req->offset = offset; |
| 163 |
req->length = length; |
| 164 |
req->data = SvREFCNT_inc (data); |
| 165 |
req->dataptr = (char *)svptr + dataoffset; |
| 166 |
req->callback = SvREFCNT_inc (callback); |
| 167 |
|
| 168 |
send_req (req); |
| 169 |
} |
| 170 |
|
| 171 |
static void |
| 172 |
poll_wait () |
| 173 |
{ |
| 174 |
fd_set rfd; |
| 175 |
FD_ZERO(&rfd); |
| 176 |
FD_SET(respipe[0], &rfd); |
| 177 |
|
| 178 |
select (respipe[0] + 1, &rfd, 0, 0, 0); |
| 179 |
} |
| 180 |
|
| 181 |
static int |
| 182 |
poll_cb (pTHX) |
| 183 |
{ |
| 184 |
dSP; |
| 185 |
int count = 0; |
| 186 |
aio_req req; |
| 187 |
|
| 188 |
while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
| 189 |
{ |
| 190 |
nreqs--; |
| 191 |
|
| 192 |
if (req->type == REQ_QUIT) |
| 193 |
{ |
| 194 |
Safefree (req->thread); |
| 195 |
started--; |
| 196 |
} |
| 197 |
else |
| 198 |
{ |
| 199 |
int errorno = errno; |
| 200 |
errno = req->errorno; |
| 201 |
|
| 202 |
if (req->type == REQ_READ) |
| 203 |
SvCUR_set (req->data, req->dataoffset |
| 204 |
+ req->result > 0 ? req->result : 0); |
| 205 |
|
| 206 |
if (req->data) |
| 207 |
SvREFCNT_dec (req->data); |
| 208 |
|
| 209 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
| 210 |
{ |
| 211 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
| 212 |
PL_laststatval = req->result; |
| 213 |
PL_statcache = *(req->statdata); |
| 214 |
|
| 215 |
Safefree (req->statdata); |
| 216 |
} |
| 217 |
|
| 218 |
PUSHMARK (SP); |
| 219 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
| 220 |
PUTBACK; |
| 221 |
call_sv (req->callback, G_VOID); |
| 222 |
SPAGAIN; |
| 223 |
|
| 224 |
if (req->callback) |
| 225 |
SvREFCNT_dec (req->callback); |
| 226 |
|
| 227 |
errno = errorno; |
| 228 |
count++; |
| 229 |
} |
| 230 |
|
| 231 |
Safefree (req); |
| 232 |
} |
| 233 |
|
| 234 |
if (qs) |
| 235 |
send_reqs (); |
| 236 |
|
| 237 |
return count; |
| 238 |
} |
| 239 |
|
| 240 |
static sigset_t fullsigset; |
| 241 |
|
| 242 |
#undef errno |
| 243 |
#include <asm/unistd.h> |
| 244 |
#include <linux/types.h> |
| 245 |
#include <sys/prctl.h> |
| 246 |
|
| 247 |
#if __alpha || __ia64 || __hppa || __v850__ |
| 248 |
# define stat kernelstat |
| 249 |
# define stat64 kernelstat64 |
| 250 |
# include <asm/stat.h> |
| 251 |
# undef stat |
| 252 |
# undef stat64 |
| 253 |
#else |
| 254 |
# define kernelstat stat |
| 255 |
# define kernelstat64 stat64 |
| 256 |
#endif |
| 257 |
|
| 258 |
#define COPY_STATDATA \ |
| 259 |
req->statdata->st_dev = statdata.st_dev; \ |
| 260 |
req->statdata->st_ino = statdata.st_ino; \ |
| 261 |
req->statdata->st_mode = statdata.st_mode; \ |
| 262 |
req->statdata->st_nlink = statdata.st_nlink; \ |
| 263 |
req->statdata->st_uid = statdata.st_uid; \ |
| 264 |
req->statdata->st_gid = statdata.st_gid; \ |
| 265 |
req->statdata->st_rdev = statdata.st_rdev; \ |
| 266 |
req->statdata->st_size = statdata.st_size; \ |
| 267 |
req->statdata->st_atime = statdata.st_atime; \ |
| 268 |
req->statdata->st_mtime = statdata.st_mtime; \ |
| 269 |
req->statdata->st_ctime = statdata.st_ctime; \ |
| 270 |
req->statdata->st_blksize = statdata.st_blksize; \ |
| 271 |
req->statdata->st_blocks = statdata.st_blocks; \ |
| 272 |
|
| 273 |
static int |
| 274 |
aio_proc (void *thr_arg) |
| 275 |
{ |
| 276 |
aio_thread *thr = thr_arg; |
| 277 |
aio_req req; |
| 278 |
int errno; |
| 279 |
|
| 280 |
/* this is very much kernel-specific :(:(:( */ |
| 281 |
/* we rely on gcc's ability to create closures. */ |
| 282 |
_syscall3(__kernel_size_t, read , unsigned int, fd, char *, buf, __kernel_size_t, count) |
| 283 |
_syscall3(__kernel_size_t, write, unsigned int, fd, char *, buf, __kernel_size_t, count) |
| 284 |
|
| 285 |
_syscall3(long, open, char *, pathname, int, flags, int, mode) |
| 286 |
_syscall1(long, close, unsigned int, fd) |
| 287 |
_syscall1(long, unlink, char *, filename); |
| 288 |
_syscall1(long, fsync, unsigned int, fd); |
| 289 |
_syscall1(long, fdatasync, unsigned int, fd); |
| 290 |
|
| 291 |
#if BYTE_ORDER == LITTLE_ENDIAN |
| 292 |
# define LOFF_ARG(off) (off & 0xffffffff), (off >> 32) |
| 293 |
#elif BYTE_ORDER == BIG_ENDIAN |
| 294 |
# define LOFF_ARG(off) (off >> 32), (off & 0xffffffff) |
| 295 |
#endif |
| 296 |
|
| 297 |
#ifndef __NR_pread64 |
| 298 |
# define __NR_pread64 __NR_pread |
| 299 |
# define __NR_pwrite64 __NR_write |
| 300 |
#endif |
| 301 |
_syscall5(__kernel_ssize_t, pread64 , unsigned int, fd, char *, buf, |
| 302 |
__kernel_size_t, count, unsigned int, offset_lh, unsigned int, offset_hl) |
| 303 |
_syscall5(__kernel_ssize_t, pwrite64, unsigned int, fd, char *, buf, |
| 304 |
__kernel_size_t, count, unsigned int, offset_lh, unsigned int, offset_hl) |
| 305 |
_syscall4(long, readahead, unsigned int, fd, unsigned int, offset_lh, unsigned int, offset_hl, __kernel_size_t, count); |
| 306 |
|
| 307 |
#if __NR_stat64 |
| 308 |
_syscall2(long, stat64 , const char *, filename, struct kernelstat64 *, buf) |
| 309 |
_syscall2(long, lstat64, const char *, filename, struct kernelstat64 *, buf) |
| 310 |
_syscall2(long, fstat64, int , fd , struct kernelstat64 *, buf) |
| 311 |
#elif __NR_stat |
| 312 |
_syscall2(long, stat , const char *, filename, struct kernelstat *, buf) |
| 313 |
_syscall2(long, lstat, const char *, filename, struct kernelstat *, buf) |
| 314 |
_syscall2(long, fstat, int , fd , struct kernelstat *, buf) |
| 315 |
#else |
| 316 |
# error "neither stat64 nor stat defined" |
| 317 |
#endif |
| 318 |
|
| 319 |
/* the following two calls might clobber errno */ |
| 320 |
sigprocmask (SIG_SETMASK, &fullsigset, 0); |
| 321 |
prctl (PR_SET_PDEATHSIG, SIGKILL); |
| 322 |
|
| 323 |
/* then loop */ |
| 324 |
while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
| 325 |
{ |
| 326 |
req->thread = thr; |
| 327 |
errno = 0; /* strictly unnecessary */ |
| 328 |
|
| 329 |
switch (req->type) |
| 330 |
{ |
| 331 |
case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break; |
| 332 |
case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break; |
| 333 |
case REQ_READAHEAD: req->result = readahead (req->fd, LOFF_ARG (req->offset), req->length); break; |
| 334 |
|
| 335 |
#if __NR_stat64 |
| 336 |
struct kernelstat64 statdata; |
| 337 |
case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break; |
| 338 |
case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break; |
| 339 |
case REQ_FSTAT: req->result = fstat64 (req->fd , &statdata); COPY_STATDATA; break; |
| 340 |
#else |
| 341 |
struct kernelstat statdata; |
| 342 |
case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break; |
| 343 |
case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break; |
| 344 |
case REQ_FSTAT: req->result = fstat (req->fd , &statdata); COPY_STATDATA; break; |
| 345 |
#endif |
| 346 |
|
| 347 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
| 348 |
case REQ_CLOSE: req->result = close (req->fd); break; |
| 349 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
| 350 |
|
| 351 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
| 352 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
| 353 |
|
| 354 |
case REQ_QUIT: |
| 355 |
write (respipe[1], (void *)&req, sizeof (req)); |
| 356 |
return 0; |
| 357 |
|
| 358 |
default: |
| 359 |
req->result = ENOSYS; |
| 360 |
break; |
| 361 |
} |
| 362 |
|
| 363 |
req->errorno = errno; |
| 364 |
write (respipe[1], (void *)&req, sizeof (req)); |
| 365 |
} |
| 366 |
|
| 367 |
return 0; |
| 368 |
} |
| 369 |
|
| 370 |
MODULE = Linux::AIO PACKAGE = Linux::AIO |
| 371 |
|
| 372 |
BOOT: |
| 373 |
{ |
| 374 |
sigfillset (&fullsigset); |
| 375 |
sigdelset (&fullsigset, SIGTERM); |
| 376 |
sigdelset (&fullsigset, SIGQUIT); |
| 377 |
sigdelset (&fullsigset, SIGABRT); |
| 378 |
sigdelset (&fullsigset, SIGINT); |
| 379 |
|
| 380 |
if (pipe (reqpipe) || pipe (respipe)) |
| 381 |
croak ("unable to initialize request or result pipe"); |
| 382 |
|
| 383 |
if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK)) |
| 384 |
croak ("cannot set result pipe to nonblocking mode"); |
| 385 |
|
| 386 |
if (fcntl (respipe[0], F_SETFL, O_NONBLOCK)) |
| 387 |
croak ("cannot set result pipe to nonblocking mode"); |
| 388 |
} |
| 389 |
|
| 390 |
void |
| 391 |
min_parallel(nthreads) |
| 392 |
int nthreads |
| 393 |
PROTOTYPE: $ |
| 394 |
CODE: |
| 395 |
while (nthreads > started) |
| 396 |
start_thread (); |
| 397 |
|
| 398 |
void |
| 399 |
max_parallel(nthreads) |
| 400 |
int nthreads |
| 401 |
PROTOTYPE: $ |
| 402 |
CODE: |
| 403 |
int cur = started; |
| 404 |
while (cur > nthreads) |
| 405 |
{ |
| 406 |
end_thread (); |
| 407 |
cur--; |
| 408 |
} |
| 409 |
|
| 410 |
while (started > nthreads) |
| 411 |
{ |
| 412 |
poll_wait (); |
| 413 |
poll_cb (aTHX); |
| 414 |
} |
| 415 |
|
| 416 |
void |
| 417 |
aio_open(pathname,flags,mode,callback) |
| 418 |
SV * pathname |
| 419 |
int flags |
| 420 |
int mode |
| 421 |
SV * callback |
| 422 |
PROTOTYPE: $$$$ |
| 423 |
CODE: |
| 424 |
aio_req req; |
| 425 |
|
| 426 |
Newz (0, req, 1, aio_cb); |
| 427 |
|
| 428 |
if (!req) |
| 429 |
croak ("out of memory during aio_req allocation"); |
| 430 |
|
| 431 |
req->type = REQ_OPEN; |
| 432 |
req->data = newSVsv (pathname); |
| 433 |
req->dataptr = SvPV_nolen (req->data); |
| 434 |
req->fd = flags; |
| 435 |
req->mode = mode; |
| 436 |
req->callback = SvREFCNT_inc (callback); |
| 437 |
|
| 438 |
send_req (req); |
| 439 |
|
| 440 |
void |
| 441 |
aio_close(fh,callback) |
| 442 |
InputStream fh |
| 443 |
SV * callback |
| 444 |
PROTOTYPE: $$ |
| 445 |
ALIAS: |
| 446 |
aio_close = REQ_CLOSE |
| 447 |
aio_fsync = REQ_FSYNC |
| 448 |
aio_fdatasync = REQ_FDATASYNC |
| 449 |
CODE: |
| 450 |
aio_req req; |
| 451 |
|
| 452 |
Newz (0, req, 1, aio_cb); |
| 453 |
|
| 454 |
if (!req) |
| 455 |
croak ("out of memory during aio_req allocation"); |
| 456 |
|
| 457 |
req->type = ix; |
| 458 |
req->fd = PerlIO_fileno (fh); |
| 459 |
req->callback = SvREFCNT_inc (callback); |
| 460 |
|
| 461 |
send_req (req); |
| 462 |
|
| 463 |
void |
| 464 |
aio_read(fh,offset,length,data,dataoffset,callback) |
| 465 |
InputStream fh |
| 466 |
UV offset |
| 467 |
IV length |
| 468 |
SV * data |
| 469 |
IV dataoffset |
| 470 |
SV * callback |
| 471 |
PROTOTYPE: $$$$$$ |
| 472 |
CODE: |
| 473 |
read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
| 474 |
|
| 475 |
void |
| 476 |
aio_write(fh,offset,length,data,dataoffset,callback) |
| 477 |
OutputStream fh |
| 478 |
UV offset |
| 479 |
IV length |
| 480 |
SV * data |
| 481 |
IV dataoffset |
| 482 |
SV * callback |
| 483 |
PROTOTYPE: $$$$$$ |
| 484 |
CODE: |
| 485 |
read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
| 486 |
|
| 487 |
void |
| 488 |
aio_stat(fh_or_path,callback) |
| 489 |
SV * fh_or_path |
| 490 |
SV * callback |
| 491 |
PROTOTYPE: $$ |
| 492 |
ALIAS: |
| 493 |
aio_lstat = 1 |
| 494 |
CODE: |
| 495 |
aio_req req; |
| 496 |
|
| 497 |
Newz (0, req, 1, aio_cb); |
| 498 |
|
| 499 |
if (!req) |
| 500 |
croak ("out of memory during aio_req allocation"); |
| 501 |
|
| 502 |
New (0, req->statdata, 1, Stat_t); |
| 503 |
|
| 504 |
if (!req->statdata) |
| 505 |
croak ("out of memory during aio_req->statdata allocation"); |
| 506 |
|
| 507 |
if (SvPOK (fh_or_path)) |
| 508 |
{ |
| 509 |
req->type = ix ? REQ_LSTAT : REQ_STAT; |
| 510 |
req->data = newSVsv (fh_or_path); |
| 511 |
req->dataptr = SvPV_nolen (req->data); |
| 512 |
} |
| 513 |
else |
| 514 |
{ |
| 515 |
req->type = REQ_FSTAT; |
| 516 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
| 517 |
} |
| 518 |
|
| 519 |
req->callback = SvREFCNT_inc (callback); |
| 520 |
|
| 521 |
send_req (req); |
| 522 |
|
| 523 |
void |
| 524 |
aio_unlink(pathname,callback) |
| 525 |
SV * pathname |
| 526 |
SV * callback |
| 527 |
PROTOTYPE: $$ |
| 528 |
CODE: |
| 529 |
aio_req req; |
| 530 |
|
| 531 |
Newz (0, req, 1, aio_cb); |
| 532 |
|
| 533 |
if (!req) |
| 534 |
croak ("out of memory during aio_req allocation"); |
| 535 |
|
| 536 |
req->type = REQ_UNLINK; |
| 537 |
req->data = newSVsv (pathname); |
| 538 |
req->dataptr = SvPV_nolen (req->data); |
| 539 |
req->callback = SvREFCNT_inc (callback); |
| 540 |
|
| 541 |
send_req (req); |
| 542 |
|
| 543 |
int |
| 544 |
poll_fileno() |
| 545 |
PROTOTYPE: |
| 546 |
CODE: |
| 547 |
RETVAL = respipe[0]; |
| 548 |
OUTPUT: |
| 549 |
RETVAL |
| 550 |
|
| 551 |
int |
| 552 |
poll_cb(...) |
| 553 |
PROTOTYPE: |
| 554 |
CODE: |
| 555 |
RETVAL = poll_cb (aTHX); |
| 556 |
OUTPUT: |
| 557 |
RETVAL |
| 558 |
|
| 559 |
void |
| 560 |
poll_wait() |
| 561 |
PROTOTYPE: |
| 562 |
CODE: |
| 563 |
poll_wait (); |
| 564 |
|
| 565 |
int |
| 566 |
nreqs() |
| 567 |
PROTOTYPE: |
| 568 |
CODE: |
| 569 |
RETVAL = nreqs; |
| 570 |
OUTPUT: |
| 571 |
RETVAL |
| 572 |
|
