… | |
… | |
221 | IO::AIO::idle_timeout $seconds |
221 | IO::AIO::idle_timeout $seconds |
222 | IO::AIO::max_outstanding $maxreqs |
222 | IO::AIO::max_outstanding $maxreqs |
223 | IO::AIO::nreqs |
223 | IO::AIO::nreqs |
224 | IO::AIO::nready |
224 | IO::AIO::nready |
225 | IO::AIO::npending |
225 | IO::AIO::npending |
|
|
226 | IO::AIO::reinit |
|
|
227 | |
226 | $nfd = IO::AIO::get_fdlimit [EXPERIMENTAL] |
228 | $nfd = IO::AIO::get_fdlimit |
227 | IO::AIO::min_fdlimit $nfd [EXPERIMENTAL] |
229 | IO::AIO::min_fdlimit $nfd |
228 | |
230 | |
229 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
231 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
230 | IO::AIO::fadvise $fh, $offset, $len, $advice |
232 | IO::AIO::fadvise $fh, $offset, $len, $advice |
|
|
233 | IO::AIO::fexecve $fh, $argv, $envp |
|
|
234 | |
231 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
235 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
232 | IO::AIO::munmap $scalar |
236 | IO::AIO::munmap $scalar |
|
|
237 | IO::AIO::mremap $scalar, $new_length, $flags[, $new_address] |
233 | IO::AIO::madvise $scalar, $offset, $length, $advice |
238 | IO::AIO::madvise $scalar, $offset, $length, $advice |
234 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
239 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
235 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
240 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
236 | IO::AIO::munlockall |
241 | IO::AIO::munlockall |
|
|
242 | |
|
|
243 | # stat extensions |
|
|
244 | $counter = IO::AIO::st_gen |
|
|
245 | $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime |
|
|
246 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
|
|
247 | $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
|
|
248 | $seconds = IO::AIO::st_btimesec |
|
|
249 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
|
|
250 | |
|
|
251 | # very much unportable syscalls |
|
|
252 | IO::AIO::accept4 $r_fh, $sockaddr, $sockaddr_len, $flags |
|
|
253 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
254 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
255 | |
|
|
256 | $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
257 | ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
258 | |
|
|
259 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
|
|
260 | $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
261 | |
|
|
262 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
|
|
263 | ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value |
|
|
264 | ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh |
|
|
265 | |
|
|
266 | $fh = IO::AIO::pidfd_open $pid[, $flags] |
|
|
267 | $status = IO::AIO::pidfd_send_signal $pidfh, $signal[, $siginfo[, $flags]] |
|
|
268 | $fh = IO::AIO::pidfd_getfd $pidfh, $targetfd[, $flags] |
237 | |
269 | |
238 | API NOTES |
270 | API NOTES |
239 | All the "aio_*" calls are more or less thin wrappers around the syscall |
271 | All the "aio_*" calls are more or less thin wrappers around the syscall |
240 | with the same name (sans "aio_"). The arguments are similar or |
272 | with the same name (sans "aio_"). The arguments are similar or |
241 | identical, and they all accept an additional (and optional) $callback |
273 | identical, and they all accept an additional (and optional) $callback |
… | |
… | |
339 | "O_APPEND"), the following POSIX and non-POSIX constants are |
371 | "O_APPEND"), the following POSIX and non-POSIX constants are |
340 | available (missing ones on your system are, as usual, 0): |
372 | available (missing ones on your system are, as usual, 0): |
341 | |
373 | |
342 | "O_ASYNC", "O_DIRECT", "O_NOATIME", "O_CLOEXEC", "O_NOCTTY", |
374 | "O_ASYNC", "O_DIRECT", "O_NOATIME", "O_CLOEXEC", "O_NOCTTY", |
343 | "O_NOFOLLOW", "O_NONBLOCK", "O_EXEC", "O_SEARCH", "O_DIRECTORY", |
375 | "O_NOFOLLOW", "O_NONBLOCK", "O_EXEC", "O_SEARCH", "O_DIRECTORY", |
344 | "O_DSYNC", "O_RSYNC", "O_SYNC", "O_PATH", "O_TMPFILE", and |
376 | "O_DSYNC", "O_RSYNC", "O_SYNC", "O_PATH", "O_TMPFILE", "O_TTY_INIT" |
345 | "O_TTY_INIT". |
377 | and "O_ACCMODE". |
346 | |
378 | |
347 | aio_close $fh, $callback->($status) |
379 | aio_close $fh, $callback->($status) |
348 | Asynchronously close a file and call the callback with the result |
380 | Asynchronously close a file and call the callback with the result |
349 | code. |
381 | code. |
350 | |
382 | |
… | |
… | |
468 | will be emulated by simply reading the data, which would have a |
500 | will be emulated by simply reading the data, which would have a |
469 | similar effect. |
501 | similar effect. |
470 | |
502 | |
471 | aio_stat $fh_or_path, $callback->($status) |
503 | aio_stat $fh_or_path, $callback->($status) |
472 | aio_lstat $fh, $callback->($status) |
504 | aio_lstat $fh, $callback->($status) |
473 | Works like perl's "stat" or "lstat" in void context. The callback |
505 | Works almost exactly like perl's "stat" or "lstat" in void context. |
474 | will be called after the stat and the results will be available |
506 | The callback will be called after the stat and the results will be |
475 | using "stat _" or "-s _" etc... |
507 | available using "stat _" or "-s _" and other tests (with the |
|
|
508 | exception of "-B" and "-T"). |
476 | |
509 | |
477 | The pathname passed to "aio_stat" must be absolute. See API NOTES, |
510 | The pathname passed to "aio_stat" must be absolute. See API NOTES, |
478 | above, for an explanation. |
511 | above, for an explanation. |
479 | |
512 | |
480 | Currently, the stats are always 64-bit-stats, i.e. instead of |
513 | Currently, the stats are always 64-bit-stats, i.e. instead of |
… | |
… | |
488 | back on traditional behaviour). |
521 | back on traditional behaviour). |
489 | |
522 | |
490 | "S_IFMT", "S_IFIFO", "S_IFCHR", "S_IFBLK", "S_IFLNK", "S_IFREG", |
523 | "S_IFMT", "S_IFIFO", "S_IFCHR", "S_IFBLK", "S_IFLNK", "S_IFREG", |
491 | "S_IFDIR", "S_IFWHT", "S_IFSOCK", "IO::AIO::major $dev_t", |
524 | "S_IFDIR", "S_IFWHT", "S_IFSOCK", "IO::AIO::major $dev_t", |
492 | "IO::AIO::minor $dev_t", "IO::AIO::makedev $major, $minor". |
525 | "IO::AIO::minor $dev_t", "IO::AIO::makedev $major, $minor". |
|
|
526 | |
|
|
527 | To access higher resolution stat timestamps, see "SUBSECOND STAT |
|
|
528 | TIME ACCESS". |
493 | |
529 | |
494 | Example: Print the length of /etc/passwd: |
530 | Example: Print the length of /etc/passwd: |
495 | |
531 | |
496 | aio_stat "/etc/passwd", sub { |
532 | aio_stat "/etc/passwd", sub { |
497 | $_[0] and die "stat failed: $!"; |
533 | $_[0] and die "stat failed: $!"; |
… | |
… | |
544 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
580 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
545 | Works like perl's "utime" function (including the special case of |
581 | Works like perl's "utime" function (including the special case of |
546 | $atime and $mtime being undef). Fractional times are supported if |
582 | $atime and $mtime being undef). Fractional times are supported if |
547 | the underlying syscalls support them. |
583 | the underlying syscalls support them. |
548 | |
584 | |
549 | When called with a pathname, uses utimes(2) if available, otherwise |
585 | When called with a pathname, uses utimensat(2) or utimes(2) if |
550 | utime(2). If called on a file descriptor, uses futimes(2) if |
586 | available, otherwise utime(2). If called on a file descriptor, uses |
551 | available, otherwise returns ENOSYS, so this is not portable. |
587 | futimens(2) or futimes(2) if available, otherwise returns ENOSYS, so |
|
|
588 | this is not portable. |
552 | |
589 | |
553 | Examples: |
590 | Examples: |
554 | |
591 | |
555 | # set atime and mtime to current time (basically touch(1)): |
592 | # set atime and mtime to current time (basically touch(1)): |
556 | aio_utime "path", undef, undef; |
593 | aio_utime "path", undef, undef; |
… | |
… | |
686 | The flags are a combination of the following constants, ORed |
723 | The flags are a combination of the following constants, ORed |
687 | together (the flags will also be passed to the callback, possibly |
724 | together (the flags will also be passed to the callback, possibly |
688 | modified): |
725 | modified): |
689 | |
726 | |
690 | IO::AIO::READDIR_DENTS |
727 | IO::AIO::READDIR_DENTS |
691 | When this flag is off, then the callback gets an arrayref |
728 | Normally the callback gets an arrayref consisting of names only |
692 | consisting of names only (as with "aio_readdir"), otherwise it |
729 | (as with "aio_readdir"). If this flag is set, then the callback |
693 | gets an arrayref with "[$name, $type, $inode]" arrayrefs, each |
730 | gets an arrayref with "[$name, $type, $inode]" arrayrefs, each |
694 | describing a single directory entry in more detail. |
731 | describing a single directory entry in more detail: |
695 | |
732 | |
696 | $name is the name of the entry. |
733 | $name is the name of the entry. |
697 | |
734 | |
698 | $type is one of the "IO::AIO::DT_xxx" constants: |
735 | $type is one of the "IO::AIO::DT_xxx" constants: |
699 | |
736 | |
700 | "IO::AIO::DT_UNKNOWN", "IO::AIO::DT_FIFO", "IO::AIO::DT_CHR", |
737 | "IO::AIO::DT_UNKNOWN", "IO::AIO::DT_FIFO", "IO::AIO::DT_CHR", |
701 | "IO::AIO::DT_DIR", "IO::AIO::DT_BLK", "IO::AIO::DT_REG", |
738 | "IO::AIO::DT_DIR", "IO::AIO::DT_BLK", "IO::AIO::DT_REG", |
702 | "IO::AIO::DT_LNK", "IO::AIO::DT_SOCK", "IO::AIO::DT_WHT". |
739 | "IO::AIO::DT_LNK", "IO::AIO::DT_SOCK", "IO::AIO::DT_WHT". |
703 | |
740 | |
704 | "IO::AIO::DT_UNKNOWN" means just that: readdir does not know. If |
741 | "IO::AIO::DT_UNKNOWN" means just that: readdir does not know. If |
705 | you need to know, you have to run stat yourself. Also, for speed |
742 | you need to know, you have to run stat yourself. Also, for |
706 | reasons, the $type scalars are read-only: you can not modify |
743 | speed/memory reasons, the $type scalars are read-only: you must |
707 | them. |
744 | not modify them. |
708 | |
745 | |
709 | $inode is the inode number (which might not be exact on systems |
746 | $inode is the inode number (which might not be exact on systems |
710 | with 64 bit inode numbers and 32 bit perls). This field has |
747 | with 64 bit inode numbers and 32 bit perls). This field has |
711 | unspecified content on systems that do not deliver the inode |
748 | unspecified content on systems that do not deliver the inode |
712 | information. |
749 | information. |
… | |
… | |
724 | of which names with short names are tried first. |
761 | of which names with short names are tried first. |
725 | |
762 | |
726 | IO::AIO::READDIR_STAT_ORDER |
763 | IO::AIO::READDIR_STAT_ORDER |
727 | When this flag is set, then the names will be returned in an |
764 | When this flag is set, then the names will be returned in an |
728 | order suitable for stat()'ing each one. That is, when you plan |
765 | order suitable for stat()'ing each one. That is, when you plan |
729 | to stat() all files in the given directory, then the returned |
766 | to stat() most or all files in the given directory, then the |
730 | order will likely be fastest. |
767 | returned order will likely be faster. |
731 | |
768 | |
732 | If both this flag and "IO::AIO::READDIR_DIRS_FIRST" are |
769 | If both this flag and "IO::AIO::READDIR_DIRS_FIRST" are |
733 | specified, then the likely dirs come first, resulting in a less |
770 | specified, then the likely dirs come first, resulting in a less |
734 | optimal stat order. |
771 | optimal stat order for stat'ing all entries, but likely a more |
|
|
772 | optimal order for finding subdirectories. |
735 | |
773 | |
736 | IO::AIO::READDIR_FOUND_UNKNOWN |
774 | IO::AIO::READDIR_FOUND_UNKNOWN |
737 | This flag should not be set when calling "aio_readdirx". |
775 | This flag should not be set when calling "aio_readdirx". |
738 | Instead, it is being set by "aio_readdirx", when any of the |
776 | Instead, it is being set by "aio_readdirx", when any of the |
739 | $type's found were "IO::AIO::DT_UNKNOWN". The absence of this |
777 | $type's found were "IO::AIO::DT_UNKNOWN". The absence of this |
… | |
… | |
880 | So in general, you should only use these calls for things that do |
918 | So in general, you should only use these calls for things that do |
881 | (filesystem) I/O, not for things that wait for other events |
919 | (filesystem) I/O, not for things that wait for other events |
882 | (network, other processes), although if you are careful and know |
920 | (network, other processes), although if you are careful and know |
883 | what you are doing, you still can. |
921 | what you are doing, you still can. |
884 | |
922 | |
885 | The following constants are available (missing ones are, as usual |
923 | The following constants are available and can be used for normal |
886 | 0): |
924 | "ioctl" and "fcntl" as well (missing ones are, as usual 0): |
887 | |
925 | |
888 | "F_DUPFD_CLOEXEC", |
926 | "F_DUPFD_CLOEXEC", |
889 | |
927 | |
890 | "F_OFD_GETLK", "F_OFD_SETLK", "F_OFD_GETLKW", |
928 | "F_OFD_GETLK", "F_OFD_SETLK", "F_OFD_GETLKW", |
891 | |
929 | |
892 | "FIFREEZE", "FITHAW", "FITRIM", "FICLONE", "FICLONERANGE", |
930 | "FIFREEZE", "FITHAW", "FITRIM", "FICLONE", "FICLONERANGE", |
893 | "FIDEDUPERANGE". |
931 | "FIDEDUPERANGE". |
|
|
932 | |
|
|
933 | "F_ADD_SEALS", "F_GET_SEALS", "F_SEAL_SEAL", "F_SEAL_SHRINK", |
|
|
934 | "F_SEAL_GROW" and "F_SEAL_WRITE". |
894 | |
935 | |
895 | "FS_IOC_GETFLAGS", "FS_IOC_SETFLAGS", "FS_IOC_GETVERSION", |
936 | "FS_IOC_GETFLAGS", "FS_IOC_SETFLAGS", "FS_IOC_GETVERSION", |
896 | "FS_IOC_SETVERSION", "FS_IOC_FIEMAP". |
937 | "FS_IOC_SETVERSION", "FS_IOC_FIEMAP". |
897 | |
938 | |
898 | "FS_IOC_FSGETXATTR", "FS_IOC_FSSETXATTR", |
939 | "FS_IOC_FSGETXATTR", "FS_IOC_FSSETXATTR", |
… | |
… | |
1009 | IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh; |
1050 | IO::AIO::mmap $data, -s $fh, IO::AIO::PROT_READ, IO::AIO::MAP_SHARED, $fh; |
1010 | aio_mlock $data; # mlock in background |
1051 | aio_mlock $data; # mlock in background |
1011 | |
1052 | |
1012 | aio_mlockall $flags, $callback->($status) |
1053 | aio_mlockall $flags, $callback->($status) |
1013 | Calls the "mlockall" function with the given $flags (a combination |
1054 | Calls the "mlockall" function with the given $flags (a combination |
1014 | of "IO::AIO::MCL_CURRENT" and "IO::AIO::MCL_FUTURE"). |
1055 | of "IO::AIO::MCL_CURRENT", "IO::AIO::MCL_FUTURE" and |
|
|
1056 | "IO::AIO::MCL_ONFAULT"). |
1015 | |
1057 | |
1016 | On systems that do not implement "mlockall", this function returns |
1058 | On systems that do not implement "mlockall", this function returns |
1017 | -1 and sets errno to "ENOSYS". |
1059 | -1 and sets errno to "ENOSYS". Similarly, flag combinations not |
|
|
1060 | supported by the system result in a return value of -1 with errno |
|
|
1061 | being set to "EINVAL". |
1018 | |
1062 | |
1019 | Note that the corresponding "munlockall" is synchronous and is |
1063 | Note that the corresponding "munlockall" is synchronous and is |
1020 | documented under "MISCELLANEOUS FUNCTIONS". |
1064 | documented under "MISCELLANEOUS FUNCTIONS". |
1021 | |
1065 | |
1022 | Example: asynchronously lock all current and future pages into |
1066 | Example: asynchronously lock all current and future pages into |
… | |
… | |
1211 | fails the request with "ENOENT", there is often no need for error |
1255 | fails the request with "ENOENT", there is often no need for error |
1212 | checking in the "aio_wd" callback, as future requests using the |
1256 | checking in the "aio_wd" callback, as future requests using the |
1213 | value will fail in the expected way. |
1257 | value will fail in the expected way. |
1214 | |
1258 | |
1215 | IO::AIO::CWD |
1259 | IO::AIO::CWD |
1216 | This is a compiletime constant (object) that represents the process |
1260 | This is a compile time constant (object) that represents the process |
1217 | current working directory. |
1261 | current working directory. |
1218 | |
1262 | |
1219 | Specifying this object as working directory object for a pathname is |
1263 | Specifying this object as working directory object for a pathname is |
1220 | as if the pathname would be specified directly, without a directory |
1264 | as if the pathname would be specified directly, without a directory |
1221 | object. For example, these calls are functionally identical: |
1265 | object. For example, these calls are functionally identical: |
… | |
… | |
1446 | Strictly equivalent to: |
1490 | Strictly equivalent to: |
1447 | |
1491 | |
1448 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1492 | IO::AIO::poll_wait, IO::AIO::poll_cb |
1449 | while IO::AIO::nreqs; |
1493 | while IO::AIO::nreqs; |
1450 | |
1494 | |
|
|
1495 | This function can be useful at program aborts, to make sure |
|
|
1496 | outstanding I/O has been done ("IO::AIO" uses an "END" block which |
|
|
1497 | already calls this function on normal exits), or when you are merely |
|
|
1498 | using "IO::AIO" for its more advanced functions, rather than for |
|
|
1499 | async I/O, e.g.: |
|
|
1500 | |
|
|
1501 | my ($dirs, $nondirs); |
|
|
1502 | IO::AIO::aio_scandir "/tmp", 0, sub { ($dirs, $nondirs) = @_ }; |
|
|
1503 | IO::AIO::flush; |
|
|
1504 | # $dirs, $nondirs are now set |
|
|
1505 | |
1451 | IO::AIO::max_poll_reqs $nreqs |
1506 | IO::AIO::max_poll_reqs $nreqs |
1452 | IO::AIO::max_poll_time $seconds |
1507 | IO::AIO::max_poll_time $seconds |
1453 | These set the maximum number of requests (default 0, meaning |
1508 | These set the maximum number of requests (default 0, meaning |
1454 | infinity) that are being processed by "IO::AIO::poll_cb" in one |
1509 | infinity) that are being processed by "IO::AIO::poll_cb" in one |
1455 | call, respectively the maximum amount of time (default 0, meaning |
1510 | call, respectively the maximum amount of time (default 0, meaning |
… | |
… | |
1544 | no longer exceeded. |
1599 | no longer exceeded. |
1545 | |
1600 | |
1546 | In other words, this setting does not enforce a queue limit, but can |
1601 | In other words, this setting does not enforce a queue limit, but can |
1547 | be used to make poll functions block if the limit is exceeded. |
1602 | be used to make poll functions block if the limit is exceeded. |
1548 | |
1603 | |
1549 | This is a very bad function to use in interactive programs because |
1604 | This is a bad function to use in interactive programs because it |
1550 | it blocks, and a bad way to reduce concurrency because it is |
1605 | blocks, and a bad way to reduce concurrency because it is inexact. |
1551 | inexact: Better use an "aio_group" together with a feed callback. |
1606 | If you need to issue many requests without being able to call a poll |
|
|
1607 | function on demand, it is better to use an "aio_group" together with |
|
|
1608 | a feed callback. |
1552 | |
1609 | |
1553 | Its main use is in scripts without an event loop - when you want to |
1610 | Its main use is in scripts without an event loop - when you want to |
1554 | stat a lot of files, you can write something like this: |
1611 | stat a lot of files, you can write something like this: |
1555 | |
1612 | |
1556 | IO::AIO::max_outstanding 32; |
1613 | IO::AIO::max_outstanding 32; |
… | |
… | |
1561 | } |
1618 | } |
1562 | |
1619 | |
1563 | IO::AIO::flush; |
1620 | IO::AIO::flush; |
1564 | |
1621 | |
1565 | The call to "poll_cb" inside the loop will normally return |
1622 | The call to "poll_cb" inside the loop will normally return |
1566 | instantly, but as soon as more thna 32 reqeusts are in-flight, it |
1623 | instantly, allowing the loop to progress, but as soon as more than |
1567 | will block until some requests have been handled. This keeps the |
1624 | 32 requests are in-flight, it will block until some requests have |
1568 | loop from pushing a large number of "aio_stat" requests onto the |
1625 | been handled. This keeps the loop from pushing a large number of |
1569 | queue. |
1626 | "aio_stat" requests onto the queue (which, with many paths to stat, |
|
|
1627 | can use up a lot of memory). |
1570 | |
1628 | |
1571 | The default value for "max_outstanding" is very large, so there is |
1629 | The default value for "max_outstanding" is very large, so there is |
1572 | no practical limit on the number of outstanding requests. |
1630 | no practical limit on the number of outstanding requests. |
1573 | |
1631 | |
1574 | STATISTICAL INFORMATION |
1632 | STATISTICAL INFORMATION |
… | |
… | |
1588 | |
1646 | |
1589 | IO::AIO::npending |
1647 | IO::AIO::npending |
1590 | Returns the number of requests currently in the pending state |
1648 | Returns the number of requests currently in the pending state |
1591 | (executed, but not yet processed by poll_cb). |
1649 | (executed, but not yet processed by poll_cb). |
1592 | |
1650 | |
|
|
1651 | SUBSECOND STAT TIME ACCESS |
|
|
1652 | Both "aio_stat"/"aio_lstat" and perl's "stat"/"lstat" functions can |
|
|
1653 | generally find access/modification and change times with subsecond time |
|
|
1654 | accuracy of the system supports it, but perl's built-in functions only |
|
|
1655 | return the integer part. |
|
|
1656 | |
|
|
1657 | The following functions return the timestamps of the most recent stat |
|
|
1658 | with subsecond precision on most systems and work both after |
|
|
1659 | "aio_stat"/"aio_lstat" and perl's "stat"/"lstat" calls. Their return |
|
|
1660 | value is only meaningful after a successful "stat"/"lstat" call, or |
|
|
1661 | during/after a successful "aio_stat"/"aio_lstat" callback. |
|
|
1662 | |
|
|
1663 | This is similar to the Time::HiRes "stat" functions, but can return full |
|
|
1664 | resolution without rounding and work with standard perl "stat", |
|
|
1665 | alleviating the need to call the special "Time::HiRes" functions, which |
|
|
1666 | do not act like their perl counterparts. |
|
|
1667 | |
|
|
1668 | On operating systems or file systems where subsecond time resolution is |
|
|
1669 | not supported or could not be detected, a fractional part of 0 is |
|
|
1670 | returned, so it is always safe to call these functions. |
|
|
1671 | |
|
|
1672 | $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, |
|
|
1673 | IO::AIO::st_btime |
|
|
1674 | Return the access, modication, change or birth time, respectively, |
|
|
1675 | including fractional part. Due to the limited precision of floating |
|
|
1676 | point, the accuracy on most platforms is only a bit better than |
|
|
1677 | milliseconds for times around now - see the *nsec* function family, |
|
|
1678 | below, for full accuracy. |
|
|
1679 | |
|
|
1680 | File birth time is only available when the OS and perl support it |
|
|
1681 | (on FreeBSD and NetBSD at the time of this writing, although support |
|
|
1682 | is adaptive, so if your OS/perl gains support, IO::AIO can take |
|
|
1683 | advantage of it). On systems where it isn't available, 0 is |
|
|
1684 | currently returned, but this might change to "undef" in a future |
|
|
1685 | version. |
|
|
1686 | |
|
|
1687 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
|
|
1688 | Returns access, modification, change and birth time all in one go, |
|
|
1689 | and maybe more times in the future version. |
|
|
1690 | |
|
|
1691 | $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, |
|
|
1692 | IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
|
|
1693 | Return the fractional access, modifcation, change or birth time, in |
|
|
1694 | nanoseconds, as an integer in the range 0 to 999999999. |
|
|
1695 | |
|
|
1696 | Note that no accessors are provided for access, modification and |
|
|
1697 | change times - you need to get those from "stat _" if required ("int |
|
|
1698 | IO::AIO::st_atime" and so on will *not* generally give you the |
|
|
1699 | correct value). |
|
|
1700 | |
|
|
1701 | $seconds = IO::AIO::st_btimesec |
|
|
1702 | The (integral) seconds part of the file birth time, if available. |
|
|
1703 | |
|
|
1704 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
|
|
1705 | Like the functions above, but returns all four times in one go (and |
|
|
1706 | maybe more in future versions). |
|
|
1707 | |
|
|
1708 | $counter = IO::AIO::st_gen |
|
|
1709 | Returns the generation counter (in practice this is just a random |
|
|
1710 | number) of the file. This is only available on platforms which have |
|
|
1711 | this member in their "struct stat" (most BSDs at the time of this |
|
|
1712 | writing) and generally only to the root usert. If unsupported, 0 is |
|
|
1713 | returned, but this might change to "undef" in a future version. |
|
|
1714 | |
|
|
1715 | Example: print the high resolution modification time of /etc, using |
|
|
1716 | "stat", and "IO::AIO::aio_stat". |
|
|
1717 | |
|
|
1718 | if (stat "/etc") { |
|
|
1719 | printf "stat(/etc) mtime: %f\n", IO::AIO::st_mtime; |
|
|
1720 | } |
|
|
1721 | |
|
|
1722 | IO::AIO::aio_stat "/etc", sub { |
|
|
1723 | $_[0] |
|
|
1724 | and return; |
|
|
1725 | |
|
|
1726 | printf "aio_stat(/etc) mtime: %d.%09d\n", (stat _)[9], IO::AIO::st_mtimensec; |
|
|
1727 | }; |
|
|
1728 | |
|
|
1729 | IO::AIO::flush; |
|
|
1730 | |
|
|
1731 | Output of the awbove on my system, showing reduced and full accuracy: |
|
|
1732 | |
|
|
1733 | stat(/etc) mtime: 1534043702.020808 |
|
|
1734 | aio_stat(/etc) mtime: 1534043702.020807792 |
|
|
1735 | |
1593 | MISCELLANEOUS FUNCTIONS |
1736 | MISCELLANEOUS FUNCTIONS |
1594 | IO::AIO implements some functions that are useful when you want to use |
1737 | IO::AIO implements some functions that are useful when you want to use |
1595 | some "Advanced I/O" function not available to in Perl, without going the |
1738 | some "Advanced I/O" function not available to in Perl, without going the |
1596 | "Asynchronous I/O" route. Many of these have an asynchronous "aio_*" |
1739 | "Asynchronous I/O" route. Many of these have an asynchronous "aio_*" |
1597 | counterpart. |
1740 | counterpart. |
1598 | |
1741 | |
|
|
1742 | $retval = IO::AIO::fexecve $fh, $argv, $envp |
|
|
1743 | A more-or-less direct equivalent to the POSIX "fexecve" functions, |
|
|
1744 | which allows you to specify the program to be executed via a file |
|
|
1745 | descriptor (or handle). Returns -1 and sets errno to "ENOSYS" if not |
|
|
1746 | available. |
|
|
1747 | |
1599 | $numfd = IO::AIO::get_fdlimit |
1748 | $numfd = IO::AIO::get_fdlimit |
1600 | This function is *EXPERIMENTAL* and subject to change. |
|
|
1601 | |
|
|
1602 | Tries to find the current file descriptor limit and returns it, or |
1749 | Tries to find the current file descriptor limit and returns it, or |
1603 | "undef" and sets $! in case of an error. The limit is one larger |
1750 | "undef" and sets $! in case of an error. The limit is one larger |
1604 | than the highest valid file descriptor number. |
1751 | than the highest valid file descriptor number. |
1605 | |
1752 | |
1606 | IO::AIO::min_fdlimit [$numfd] |
1753 | IO::AIO::min_fdlimit [$numfd] |
1607 | This function is *EXPERIMENTAL* and subject to change. |
|
|
1608 | |
|
|
1609 | Try to increase the current file descriptor limit(s) to at least |
1754 | Try to increase the current file descriptor limit(s) to at least |
1610 | $numfd by changing the soft or hard file descriptor resource limit. |
1755 | $numfd by changing the soft or hard file descriptor resource limit. |
1611 | If $numfd is missing, it will try to set a very high limit, although |
1756 | If $numfd is missing, it will try to set a very high limit, although |
1612 | this is not recommended when you know the actual minimum that you |
1757 | this is not recommended when you know the actual minimum that you |
1613 | require. |
1758 | require. |
… | |
… | |
1700 | not available, the are 0): "IO::AIO::MAP_ANONYMOUS" (which is set to |
1845 | not available, the are 0): "IO::AIO::MAP_ANONYMOUS" (which is set to |
1701 | "MAP_ANON" if your system only provides this constant), |
1846 | "MAP_ANON" if your system only provides this constant), |
1702 | "IO::AIO::MAP_LOCKED", "IO::AIO::MAP_NORESERVE", |
1847 | "IO::AIO::MAP_LOCKED", "IO::AIO::MAP_NORESERVE", |
1703 | "IO::AIO::MAP_POPULATE", "IO::AIO::MAP_NONBLOCK", |
1848 | "IO::AIO::MAP_POPULATE", "IO::AIO::MAP_NONBLOCK", |
1704 | "IO::AIO::MAP_FIXED", "IO::AIO::MAP_GROWSDOWN", |
1849 | "IO::AIO::MAP_FIXED", "IO::AIO::MAP_GROWSDOWN", |
1705 | "IO::AIO::MAP_32BIT", "IO::AIO::MAP_HUGETLB" or |
1850 | "IO::AIO::MAP_32BIT", "IO::AIO::MAP_HUGETLB", "IO::AIO::MAP_STACK", |
1706 | "IO::AIO::MAP_STACK". |
1851 | "IO::AIO::MAP_FIXED_NOREPLACE", "IO::AIO::MAP_SHARED_VALIDATE", |
|
|
1852 | "IO::AIO::MAP_SYNC" or "IO::AIO::MAP_UNINITIALIZED". |
1707 | |
1853 | |
1708 | If $fh is "undef", then a file descriptor of -1 is passed. |
1854 | If $fh is "undef", then a file descriptor of -1 is passed. |
1709 | |
1855 | |
1710 | $offset is the offset from the start of the file - it generally must |
1856 | $offset is the offset from the start of the file - it generally must |
1711 | be a multiple of "IO::AIO::PAGESIZE" and defaults to 0. |
1857 | be a multiple of "IO::AIO::PAGESIZE" and defaults to 0. |
… | |
… | |
1723 | |
1869 | |
1724 | my $fast_md5 = md5 $data; |
1870 | my $fast_md5 = md5 $data; |
1725 | |
1871 | |
1726 | IO::AIO::munmap $scalar |
1872 | IO::AIO::munmap $scalar |
1727 | Removes a previous mmap and undefines the $scalar. |
1873 | Removes a previous mmap and undefines the $scalar. |
|
|
1874 | |
|
|
1875 | IO::AIO::mremap $scalar, $new_length, $flags = MREMAP_MAYMOVE[, |
|
|
1876 | $new_address = 0] |
|
|
1877 | Calls the Linux-specific mremap(2) system call. The $scalar must |
|
|
1878 | have been mapped by "IO::AIO::mmap", and $flags must currently |
|
|
1879 | either be 0 or "IO::AIO::MREMAP_MAYMOVE". |
|
|
1880 | |
|
|
1881 | Returns true if successful, and false otherwise. If the underlying |
|
|
1882 | mmapped region has changed address, then the true value has the |
|
|
1883 | numerical value 1, otherwise it has the numerical value 0: |
|
|
1884 | |
|
|
1885 | my $success = IO::AIO::mremap $mmapped, 8192, IO::AIO::MREMAP_MAYMOVE |
|
|
1886 | or die "mremap: $!"; |
|
|
1887 | |
|
|
1888 | if ($success*1) { |
|
|
1889 | warn "scalar has chanegd address in memory\n"; |
|
|
1890 | } |
|
|
1891 | |
|
|
1892 | "IO::AIO::MREMAP_FIXED" and the $new_address argument are currently |
|
|
1893 | implemented, but not supported and might go away in a future |
|
|
1894 | version. |
|
|
1895 | |
|
|
1896 | On systems where this call is not supported or is not emulated, this |
|
|
1897 | call returns falls and sets $! to "ENOSYS". |
|
|
1898 | |
|
|
1899 | IO::AIO::mlockall $flags |
|
|
1900 | Calls the "eio_mlockall_sync" function, which is like |
|
|
1901 | "aio_mlockall", but is blocking. |
1728 | |
1902 | |
1729 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
1903 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
1730 | Calls the "munlock" function, undoing the effects of a previous |
1904 | Calls the "munlock" function, undoing the effects of a previous |
1731 | "aio_mlock" call (see its description for details). |
1905 | "aio_mlock" call (see its description for details). |
1732 | |
1906 | |
1733 | IO::AIO::munlockall |
1907 | IO::AIO::munlockall |
1734 | Calls the "munlockall" function. |
1908 | Calls the "munlockall" function. |
1735 | |
1909 | |
1736 | On systems that do not implement "munlockall", this function returns |
1910 | On systems that do not implement "munlockall", this function returns |
1737 | ENOSYS, otherwise the return value of "munlockall". |
1911 | ENOSYS, otherwise the return value of "munlockall". |
|
|
1912 | |
|
|
1913 | $fh = IO::AIO::accept4 $r_fh, $sockaddr, $sockaddr_maxlen, $flags |
|
|
1914 | Uses the GNU/Linux accept4(2) syscall, if available, to accept a |
|
|
1915 | socket and return the new file handle on success, or sets $! and |
|
|
1916 | returns "undef" on error. |
|
|
1917 | |
|
|
1918 | The remote name of the new socket will be stored in $sockaddr, which |
|
|
1919 | will be extended to allow for at least $sockaddr_maxlen octets. If |
|
|
1920 | the socket name does not fit into $sockaddr_maxlen octets, this is |
|
|
1921 | signaled by returning a longer string in $sockaddr, which might or |
|
|
1922 | might not be truncated. |
|
|
1923 | |
|
|
1924 | To accept name-less sockets, use "undef" for $sockaddr and 0 for |
|
|
1925 | $sockaddr_maxlen. |
|
|
1926 | |
|
|
1927 | The main reasons to use this syscall rather than portable accept(2) |
|
|
1928 | are that you can specify "SOCK_NONBLOCK" and/or "SOCK_CLOEXEC" flags |
|
|
1929 | and you can accept name-less sockets by specifying 0 for |
|
|
1930 | $sockaddr_maxlen, which is sadly not possible with perl's interface |
|
|
1931 | to "accept". |
1738 | |
1932 | |
1739 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
1933 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
1740 | Calls the GNU/Linux splice(2) syscall, if available. If $r_off or |
1934 | Calls the GNU/Linux splice(2) syscall, if available. If $r_off or |
1741 | $w_off are "undef", then "NULL" is passed for these, otherwise they |
1935 | $w_off are "undef", then "NULL" is passed for these, otherwise they |
1742 | should be the file offset. |
1936 | should be the file offset. |
… | |
… | |
1783 | Example: create a pipe race-free w.r.t. threads and fork: |
1977 | Example: create a pipe race-free w.r.t. threads and fork: |
1784 | |
1978 | |
1785 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
1979 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
1786 | or die "pipe2: $!\n"; |
1980 | or die "pipe2: $!\n"; |
1787 | |
1981 | |
|
|
1982 | $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
1983 | This is a direct interface to the Linux memfd_create(2) system call. |
|
|
1984 | The (unhelpful) default for $flags is 0, but your default should be |
|
|
1985 | "IO::AIO::MFD_CLOEXEC". |
|
|
1986 | |
|
|
1987 | On success, the new memfd filehandle is returned, otherwise returns |
|
|
1988 | "undef". If the memfd_create syscall is missing, fails with |
|
|
1989 | "ENOSYS". |
|
|
1990 | |
|
|
1991 | Please refer to memfd_create(2) for more info on this call. |
|
|
1992 | |
|
|
1993 | The following $flags values are available: "IO::AIO::MFD_CLOEXEC", |
|
|
1994 | "IO::AIO::MFD_ALLOW_SEALING", "IO::AIO::MFD_HUGETLB", |
|
|
1995 | "IO::AIO::MFD_HUGETLB_2MB" and "IO::AIO::MFD_HUGETLB_1GB". |
|
|
1996 | |
|
|
1997 | Example: create a new memfd. |
|
|
1998 | |
|
|
1999 | my $fh = IO::AIO::memfd_create "somenameforprocfd", IO::AIO::MFD_CLOEXEC |
|
|
2000 | or die "memfd_create: $!\n"; |
|
|
2001 | |
|
|
2002 | $fh = IO::AIO::pidfd_open $pid[, $flags] |
|
|
2003 | This is an interface to the Linux pidfd_open(2) system call. The |
|
|
2004 | default for $flags is 0. |
|
|
2005 | |
|
|
2006 | On success, a new pidfd filehandle is returned (that is already set |
|
|
2007 | to close-on-exec), otherwise returns "undef". If the syscall is |
|
|
2008 | missing, fails with "ENOSYS". |
|
|
2009 | |
|
|
2010 | Example: open pid 6341 as pidfd. |
|
|
2011 | |
|
|
2012 | my $fh = IO::AIO::pidfd_open 6341 |
|
|
2013 | or die "pidfd_open: $!\n"; |
|
|
2014 | |
|
|
2015 | $status = IO::AIO::pidfd_send_signal $pidfh, $signal[, $siginfo[, |
|
|
2016 | $flags]] |
|
|
2017 | This is an interface to the Linux pidfd_send_signal system call. The |
|
|
2018 | default for $siginfo is "undef" and the default for $flags is 0. |
|
|
2019 | |
|
|
2020 | Returns the system call status. If the syscall is missing, fails |
|
|
2021 | with "ENOSYS". |
|
|
2022 | |
|
|
2023 | When specified, $siginfo must be a reference to a hash with one or |
|
|
2024 | more of the following members: |
|
|
2025 | |
|
|
2026 | code - the "si_code" member |
|
|
2027 | pid - the "si_pid" member |
|
|
2028 | uid - the "si_uid" member |
|
|
2029 | value_int - the "si_value.sival_int" member |
|
|
2030 | value_ptr - the "si_value.sival_ptr" member, specified as an integer |
|
|
2031 | |
|
|
2032 | Example: send a SIGKILL to the specified process. |
|
|
2033 | |
|
|
2034 | my $status = IO::AIO::pidfd_send_signal $pidfh, 9, undef |
|
|
2035 | and die "pidfd_send_signal: $!\n"; |
|
|
2036 | |
|
|
2037 | Example: send a SIGKILL to the specified process with extra data. |
|
|
2038 | |
|
|
2039 | my $status = IO::AIO::pidfd_send_signal $pidfh, 9, { code => -1, value_int => 7 } |
|
|
2040 | and die "pidfd_send_signal: $!\n"; |
|
|
2041 | |
|
|
2042 | $fh = IO::AIO::pidfd_getfd $pidfh, $targetfd[, $flags] |
|
|
2043 | This is an interface to the Linux pidfd_getfd system call. The |
|
|
2044 | default for $flags is 0. |
|
|
2045 | |
|
|
2046 | On success, returns a dup'ed copy of the target file descriptor |
|
|
2047 | (specified as an integer) returned (that is already set to |
|
|
2048 | close-on-exec), otherwise returns "undef". If the syscall is |
|
|
2049 | missing, fails with "ENOSYS". |
|
|
2050 | |
|
|
2051 | Example: get a copy of standard error of another process and print |
|
|
2052 | soemthing to it. |
|
|
2053 | |
|
|
2054 | my $errfh = IO::AIO::pidfd_getfd $pidfh, 2 |
|
|
2055 | or die "pidfd_getfd: $!\n"; |
|
|
2056 | print $errfh "stderr\n"; |
|
|
2057 | |
1788 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
2058 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
1789 | This is a direct interface to the Linux eventfd(2) system call. The |
2059 | This is a direct interface to the Linux eventfd(2) system call. The |
1790 | (unhelpful) defaults for $initval and $flags are 0 for both. |
2060 | (unhelpful) defaults for $initval and $flags are 0 for both. |
1791 | |
2061 | |
1792 | On success, the new eventfd filehandle is returned, otherwise |
2062 | On success, the new eventfd filehandle is returned, otherwise |
… | |
… | |
1799 | "IO::AIO::EFD_CLOEXEC", "IO::AIO::EFD_NONBLOCK" and |
2069 | "IO::AIO::EFD_CLOEXEC", "IO::AIO::EFD_NONBLOCK" and |
1800 | "IO::AIO::EFD_SEMAPHORE" (Linux 2.6.30). |
2070 | "IO::AIO::EFD_SEMAPHORE" (Linux 2.6.30). |
1801 | |
2071 | |
1802 | Example: create a new eventfd filehandle: |
2072 | Example: create a new eventfd filehandle: |
1803 | |
2073 | |
1804 | $fh = IO::AIO::eventfd 0, IO::AIO::O_CLOEXEC |
2074 | $fh = IO::AIO::eventfd 0, IO::AIO::EFD_CLOEXEC |
1805 | or die "eventfd: $!\n"; |
2075 | or die "eventfd: $!\n"; |
1806 | |
2076 | |
1807 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
2077 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
1808 | This is a direct interface to the Linux timerfd_create(2) system |
2078 | This is a direct interface to the Linux timerfd_create(2) system |
1809 | call. The (unhelpful) default for $flags is 0. |
2079 | call. The (unhelpful) default for $flags is 0, but your default |
|
|
2080 | should be "IO::AIO::TFD_CLOEXEC". |
1810 | |
2081 | |
1811 | On success, the new timerfd filehandle is returned, otherwise |
2082 | On success, the new timerfd filehandle is returned, otherwise |
1812 | returns "undef". If the eventfd syscall is missing, fails with |
2083 | returns "undef". If the timerfd_create syscall is missing, fails |
1813 | "ENOSYS". |
2084 | with "ENOSYS". |
1814 | |
2085 | |
1815 | Please refer to timerfd_create(2) for more info on this call. |
2086 | Please refer to timerfd_create(2) for more info on this call. |
1816 | |
2087 | |
1817 | The following $clockid values are available: |
2088 | The following $clockid values are available: |
1818 | "IO::AIO::CLOCK_REALTIME", "IO::AIO::CLOCK_MONOTONIC" |
2089 | "IO::AIO::CLOCK_REALTIME", "IO::AIO::CLOCK_MONOTONIC" |
… | |
… | |
1961 | I am not sure anything can be done about this, so this is considered a |
2232 | I am not sure anything can be done about this, so this is considered a |
1962 | known issue, rather than a bug. |
2233 | known issue, rather than a bug. |
1963 | |
2234 | |
1964 | SEE ALSO |
2235 | SEE ALSO |
1965 | AnyEvent::AIO for easy integration into event loops, Coro::AIO for a |
2236 | AnyEvent::AIO for easy integration into event loops, Coro::AIO for a |
1966 | more natural syntax. |
2237 | more natural syntax and IO::FDPass for file descriptor passing. |
1967 | |
2238 | |
1968 | AUTHOR |
2239 | AUTHOR |
1969 | Marc Lehmann <schmorp@schmorp.de> |
2240 | Marc Lehmann <schmorp@schmorp.de> |
1970 | http://home.schmorp.de/ |
2241 | http://home.schmorp.de/ |
1971 | |
2242 | |