| … | |
… | |
| 64 | |
64 | |
| 65 | EXAMPLE |
65 | EXAMPLE |
| 66 | This is a simple example that uses the EV module and loads /etc/passwd |
66 | This is a simple example that uses the EV module and loads /etc/passwd |
| 67 | asynchronously: |
67 | asynchronously: |
| 68 | |
68 | |
| 69 | use Fcntl; |
|
|
| 70 | use EV; |
69 | use EV; |
| 71 | use IO::AIO; |
70 | use IO::AIO; |
| 72 | |
71 | |
| 73 | # register the IO::AIO callback with EV |
72 | # register the IO::AIO callback with EV |
| 74 | my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
73 | my $aio_w = EV::io IO::AIO::poll_fileno, EV::READ, \&IO::AIO::poll_cb; |
| … | |
… | |
| 91 | |
90 | |
| 92 | # file contents now in $contents |
91 | # file contents now in $contents |
| 93 | print $contents; |
92 | print $contents; |
| 94 | |
93 | |
| 95 | # exit event loop and program |
94 | # exit event loop and program |
| 96 | EV::unloop; |
95 | EV::break; |
| 97 | }; |
96 | }; |
| 98 | }; |
97 | }; |
| 99 | |
98 | |
| 100 | # possibly queue up other requests, or open GUI windows, |
99 | # possibly queue up other requests, or open GUI windows, |
| 101 | # check for sockets etc. etc. |
100 | # check for sockets etc. etc. |
| 102 | |
101 | |
| 103 | # process events as long as there are some: |
102 | # process events as long as there are some: |
| 104 | EV::loop; |
103 | EV::run; |
| 105 | |
104 | |
| 106 | REQUEST ANATOMY AND LIFETIME |
105 | REQUEST ANATOMY AND LIFETIME |
| 107 | Every "aio_*" function creates a request. which is a C data structure |
106 | Every "aio_*" function creates a request. which is a C data structure |
| 108 | not directly visible to Perl. |
107 | not directly visible to Perl. |
| 109 | |
108 | |
| … | |
… | |
| 146 | the actual aio request is severed and calling its methods will |
145 | the actual aio request is severed and calling its methods will |
| 147 | either do nothing or result in a runtime error). |
146 | either do nothing or result in a runtime error). |
| 148 | |
147 | |
| 149 | FUNCTIONS |
148 | FUNCTIONS |
| 150 | QUICK OVERVIEW |
149 | QUICK OVERVIEW |
| 151 | This section simply lists the prototypes of the most important functions |
150 | This section simply lists the prototypes most of the functions for quick |
| 152 | for quick reference. See the following sections for function-by-function |
151 | reference. See the following sections for function-by-function |
| 153 | documentation. |
152 | documentation. |
| 154 | |
153 | |
| 155 | aio_wd $pathname, $callback->($wd) |
154 | aio_wd $pathname, $callback->($wd) |
| 156 | aio_open $pathname, $flags, $mode, $callback->($fh) |
155 | aio_open $pathname, $flags, $mode, $callback->($fh) |
| 157 | aio_close $fh, $callback->($status) |
156 | aio_close $fh, $callback->($status) |
| … | |
… | |
| 165 | aio_statvfs $fh_or_path, $callback->($statvfs) |
164 | aio_statvfs $fh_or_path, $callback->($statvfs) |
| 166 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
165 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
| 167 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
166 | aio_chown $fh_or_path, $uid, $gid, $callback->($status) |
| 168 | aio_chmod $fh_or_path, $mode, $callback->($status) |
167 | aio_chmod $fh_or_path, $mode, $callback->($status) |
| 169 | aio_truncate $fh_or_path, $offset, $callback->($status) |
168 | aio_truncate $fh_or_path, $offset, $callback->($status) |
|
|
169 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
|
|
170 | aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
| 170 | aio_unlink $pathname, $callback->($status) |
171 | aio_unlink $pathname, $callback->($status) |
| 171 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
172 | aio_mknod $pathname, $mode, $dev, $callback->($status) |
| 172 | aio_link $srcpath, $dstpath, $callback->($status) |
173 | aio_link $srcpath, $dstpath, $callback->($status) |
| 173 | aio_symlink $srcpath, $dstpath, $callback->($status) |
174 | aio_symlink $srcpath, $dstpath, $callback->($status) |
| 174 | aio_readlink $pathname, $callback->($link) |
175 | aio_readlink $pathname, $callback->($link) |
| 175 | aio_realpath $pathname, $callback->($link) |
176 | aio_realpath $pathname, $callback->($path) |
| 176 | aio_rename $srcpath, $dstpath, $callback->($status) |
177 | aio_rename $srcpath, $dstpath, $callback->($status) |
| 177 | aio_mkdir $pathname, $mode, $callback->($status) |
178 | aio_mkdir $pathname, $mode, $callback->($status) |
| 178 | aio_rmdir $pathname, $callback->($status) |
179 | aio_rmdir $pathname, $callback->($status) |
| 179 | aio_readdir $pathname, $callback->($entries) |
180 | aio_readdir $pathname, $callback->($entries) |
| 180 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
181 | aio_readdirx $pathname, $flags, $callback->($entries, $flags) |
| … | |
… | |
| 216 | IO::AIO::nready |
217 | IO::AIO::nready |
| 217 | IO::AIO::npending |
218 | IO::AIO::npending |
| 218 | |
219 | |
| 219 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
220 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
| 220 | IO::AIO::fadvise $fh, $offset, $len, $advice |
221 | IO::AIO::fadvise $fh, $offset, $len, $advice |
|
|
222 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
|
|
223 | IO::AIO::munmap $scalar |
| 221 | IO::AIO::madvise $scalar, $offset, $length, $advice |
224 | IO::AIO::madvise $scalar, $offset, $length, $advice |
| 222 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
225 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
| 223 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
226 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
| 224 | IO::AIO::munlockall |
227 | IO::AIO::munlockall |
| 225 | |
228 | |
| … | |
… | |
| 293 | Similar to "aioreq_pri", but subtracts the given value from the |
296 | Similar to "aioreq_pri", but subtracts the given value from the |
| 294 | current priority, so the effect is cumulative. |
297 | current priority, so the effect is cumulative. |
| 295 | |
298 | |
| 296 | aio_open $pathname, $flags, $mode, $callback->($fh) |
299 | aio_open $pathname, $flags, $mode, $callback->($fh) |
| 297 | Asynchronously open or create a file and call the callback with a |
300 | Asynchronously open or create a file and call the callback with a |
| 298 | newly created filehandle for the file. |
301 | newly created filehandle for the file (or "undef" in case of an |
|
|
302 | error). |
| 299 | |
303 | |
| 300 | The pathname passed to "aio_open" must be absolute. See API NOTES, |
304 | The pathname passed to "aio_open" must be absolute. See API NOTES, |
| 301 | above, for an explanation. |
305 | above, for an explanation. |
| 302 | |
306 | |
| 303 | The $flags argument is a bitmask. See the "Fcntl" module for a list. |
307 | The $flags argument is a bitmask. See the "Fcntl" module for a list. |
| … | |
… | |
| 326 | "O_APPEND"), the following POSIX and non-POSIX constants are |
330 | "O_APPEND"), the following POSIX and non-POSIX constants are |
| 327 | available (missing ones on your system are, as usual, 0): |
331 | available (missing ones on your system are, as usual, 0): |
| 328 | |
332 | |
| 329 | "O_ASYNC", "O_DIRECT", "O_NOATIME", "O_CLOEXEC", "O_NOCTTY", |
333 | "O_ASYNC", "O_DIRECT", "O_NOATIME", "O_CLOEXEC", "O_NOCTTY", |
| 330 | "O_NOFOLLOW", "O_NONBLOCK", "O_EXEC", "O_SEARCH", "O_DIRECTORY", |
334 | "O_NOFOLLOW", "O_NONBLOCK", "O_EXEC", "O_SEARCH", "O_DIRECTORY", |
| 331 | "O_DSYNC", "O_RSYNC", "O_SYNC" and "O_TTY_INIT". |
335 | "O_DSYNC", "O_RSYNC", "O_SYNC", "O_PATH", "O_TMPFILE", and |
|
|
336 | "O_TTY_INIT". |
| 332 | |
337 | |
| 333 | aio_close $fh, $callback->($status) |
338 | aio_close $fh, $callback->($status) |
| 334 | Asynchronously close a file and call the callback with the result |
339 | Asynchronously close a file and call the callback with the result |
| 335 | code. |
340 | code. |
| 336 | |
341 | |
| … | |
… | |
| 355 | in case of an error. |
360 | in case of an error. |
| 356 | |
361 | |
| 357 | In theory, the $whence constants could be different than the |
362 | In theory, the $whence constants could be different than the |
| 358 | corresponding values from Fcntl, but perl guarantees they are the |
363 | corresponding values from Fcntl, but perl guarantees they are the |
| 359 | same, so don't panic. |
364 | same, so don't panic. |
|
|
365 | |
|
|
366 | As a GNU/Linux (and maybe Solaris) extension, also the constants |
|
|
367 | "IO::AIO::SEEK_DATA" and "IO::AIO::SEEK_HOLE" are available, if they |
|
|
368 | could be found. No guarantees about suitability for use in |
|
|
369 | "aio_seek" or Perl's "sysseek" can be made though, although I would |
|
|
370 | naively assume they "just work". |
| 360 | |
371 | |
| 361 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
372 | aio_read $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
| 362 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
373 | aio_write $fh,$offset,$length, $data,$dataoffset, $callback->($retval) |
| 363 | Reads or writes $length bytes from or to the specified $fh and |
374 | Reads or writes $length bytes from or to the specified $fh and |
| 364 | $offset into the scalar given by $data and offset $dataoffset and |
375 | $offset into the scalar given by $data and offset $dataoffset and |
| … | |
… | |
| 519 | namemax => 255, |
530 | namemax => 255, |
| 520 | frsize => 1024, |
531 | frsize => 1024, |
| 521 | fsid => 1810 |
532 | fsid => 1810 |
| 522 | } |
533 | } |
| 523 | |
534 | |
|
|
535 | Here is a (likely partial - send me updates!) list of fsid values |
|
|
536 | used by Linux - it is safe to hardcode these when $^O is "linux": |
|
|
537 | |
|
|
538 | 0x0000adf5 adfs |
|
|
539 | 0x0000adff affs |
|
|
540 | 0x5346414f afs |
|
|
541 | 0x09041934 anon-inode filesystem |
|
|
542 | 0x00000187 autofs |
|
|
543 | 0x42465331 befs |
|
|
544 | 0x1badface bfs |
|
|
545 | 0x42494e4d binfmt_misc |
|
|
546 | 0x9123683e btrfs |
|
|
547 | 0x0027e0eb cgroupfs |
|
|
548 | 0xff534d42 cifs |
|
|
549 | 0x73757245 coda |
|
|
550 | 0x012ff7b7 coh |
|
|
551 | 0x28cd3d45 cramfs |
|
|
552 | 0x453dcd28 cramfs-wend (wrong endianness) |
|
|
553 | 0x64626720 debugfs |
|
|
554 | 0x00001373 devfs |
|
|
555 | 0x00001cd1 devpts |
|
|
556 | 0x0000f15f ecryptfs |
|
|
557 | 0x00414a53 efs |
|
|
558 | 0x0000137d ext |
|
|
559 | 0x0000ef53 ext2/ext3/ext4 |
|
|
560 | 0x0000ef51 ext2 |
|
|
561 | 0xf2f52010 f2fs |
|
|
562 | 0x00004006 fat |
|
|
563 | 0x65735546 fuseblk |
|
|
564 | 0x65735543 fusectl |
|
|
565 | 0x0bad1dea futexfs |
|
|
566 | 0x01161970 gfs2 |
|
|
567 | 0x47504653 gpfs |
|
|
568 | 0x00004244 hfs |
|
|
569 | 0xf995e849 hpfs |
|
|
570 | 0x00c0ffee hostfs |
|
|
571 | 0x958458f6 hugetlbfs |
|
|
572 | 0x2bad1dea inotifyfs |
|
|
573 | 0x00009660 isofs |
|
|
574 | 0x000072b6 jffs2 |
|
|
575 | 0x3153464a jfs |
|
|
576 | 0x6b414653 k-afs |
|
|
577 | 0x0bd00bd0 lustre |
|
|
578 | 0x0000137f minix |
|
|
579 | 0x0000138f minix 30 char names |
|
|
580 | 0x00002468 minix v2 |
|
|
581 | 0x00002478 minix v2 30 char names |
|
|
582 | 0x00004d5a minix v3 |
|
|
583 | 0x19800202 mqueue |
|
|
584 | 0x00004d44 msdos |
|
|
585 | 0x0000564c novell |
|
|
586 | 0x00006969 nfs |
|
|
587 | 0x6e667364 nfsd |
|
|
588 | 0x00003434 nilfs |
|
|
589 | 0x5346544e ntfs |
|
|
590 | 0x00009fa1 openprom |
|
|
591 | 0x7461636F ocfs2 |
|
|
592 | 0x00009fa0 proc |
|
|
593 | 0x6165676c pstorefs |
|
|
594 | 0x0000002f qnx4 |
|
|
595 | 0x68191122 qnx6 |
|
|
596 | 0x858458f6 ramfs |
|
|
597 | 0x52654973 reiserfs |
|
|
598 | 0x00007275 romfs |
|
|
599 | 0x67596969 rpc_pipefs |
|
|
600 | 0x73636673 securityfs |
|
|
601 | 0xf97cff8c selinux |
|
|
602 | 0x0000517b smb |
|
|
603 | 0x534f434b sockfs |
|
|
604 | 0x73717368 squashfs |
|
|
605 | 0x62656572 sysfs |
|
|
606 | 0x012ff7b6 sysv2 |
|
|
607 | 0x012ff7b5 sysv4 |
|
|
608 | 0x01021994 tmpfs |
|
|
609 | 0x15013346 udf |
|
|
610 | 0x00011954 ufs |
|
|
611 | 0x54190100 ufs byteswapped |
|
|
612 | 0x00009fa2 usbdevfs |
|
|
613 | 0x01021997 v9fs |
|
|
614 | 0xa501fcf5 vxfs |
|
|
615 | 0xabba1974 xenfs |
|
|
616 | 0x012ff7b4 xenix |
|
|
617 | 0x58465342 xfs |
|
|
618 | 0x012fd16d xia |
|
|
619 | |
| 524 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
620 | aio_utime $fh_or_path, $atime, $mtime, $callback->($status) |
| 525 | Works like perl's "utime" function (including the special case of |
621 | Works like perl's "utime" function (including the special case of |
| 526 | $atime and $mtime being undef). Fractional times are supported if |
622 | $atime and $mtime being undef). Fractional times are supported if |
| 527 | the underlying syscalls support them. |
623 | the underlying syscalls support them. |
| 528 | |
624 | |
| … | |
… | |
| 550 | aio_chown "path", 0, undef; |
646 | aio_chown "path", 0, undef; |
| 551 | |
647 | |
| 552 | aio_truncate $fh_or_path, $offset, $callback->($status) |
648 | aio_truncate $fh_or_path, $offset, $callback->($status) |
| 553 | Works like truncate(2) or ftruncate(2). |
649 | Works like truncate(2) or ftruncate(2). |
| 554 | |
650 | |
|
|
651 | aio_allocate $fh, $mode, $offset, $len, $callback->($status) |
|
|
652 | Allocates or frees disk space according to the $mode argument. See |
|
|
653 | the linux "fallocate" documentation for details. |
|
|
654 | |
|
|
655 | $mode is usually 0 or "IO::AIO::FALLOC_FL_KEEP_SIZE" to allocate |
|
|
656 | space, or "IO::AIO::FALLOC_FL_PUNCH_HOLE | |
|
|
657 | IO::AIO::FALLOC_FL_KEEP_SIZE", to deallocate a file range. |
|
|
658 | |
|
|
659 | IO::AIO also supports "FALLOC_FL_COLLAPSE_RANGE", to remove a range |
|
|
660 | (without leaving a hole) and "FALLOC_FL_ZERO_RANGE", to zero a range |
|
|
661 | (see your fallocate(2) manpage). |
|
|
662 | |
|
|
663 | The file system block size used by "fallocate" is presumably the |
|
|
664 | "f_bsize" returned by "statvfs". |
|
|
665 | |
|
|
666 | If "fallocate" isn't available or cannot be emulated (currently no |
|
|
667 | emulation will be attempted), passes -1 and sets $! to "ENOSYS". |
|
|
668 | |
| 555 | aio_chmod $fh_or_path, $mode, $callback->($status) |
669 | aio_chmod $fh_or_path, $mode, $callback->($status) |
| 556 | Works like perl's "chmod" function. |
670 | Works like perl's "chmod" function. |
| 557 | |
671 | |
| 558 | aio_unlink $pathname, $callback->($status) |
672 | aio_unlink $pathname, $callback->($status) |
| 559 | Asynchronously unlink (delete) a file and call the callback with the |
673 | Asynchronously unlink (delete) a file and call the callback with the |
| … | |
… | |
| 585 | the callback. If an error occurs, nothing or undef gets passed to |
699 | the callback. If an error occurs, nothing or undef gets passed to |
| 586 | the callback. |
700 | the callback. |
| 587 | |
701 | |
| 588 | aio_realpath $pathname, $callback->($path) |
702 | aio_realpath $pathname, $callback->($path) |
| 589 | Asynchronously make the path absolute and resolve any symlinks in |
703 | Asynchronously make the path absolute and resolve any symlinks in |
| 590 | $path. The resulting path only consists of directories (Same as |
704 | $path. The resulting path only consists of directories (same as |
| 591 | Cwd::realpath). |
705 | Cwd::realpath). |
| 592 | |
706 | |
| 593 | This request can be used to get the absolute path of the current |
707 | This request can be used to get the absolute path of the current |
| 594 | working directory by passing it a path of . (a single dot). |
708 | working directory by passing it a path of . (a single dot). |
| 595 | |
709 | |
| 596 | aio_rename $srcpath, $dstpath, $callback->($status) |
710 | aio_rename $srcpath, $dstpath, $callback->($status) |
| 597 | Asynchronously rename the object at $srcpath to $dstpath, just as |
711 | Asynchronously rename the object at $srcpath to $dstpath, just as |
| 598 | rename(2) and call the callback with the result code. |
712 | rename(2) and call the callback with the result code. |
|
|
713 | |
|
|
714 | On systems that support the AIO::WD working directory abstraction |
|
|
715 | natively, the case "[$wd, "."]" as $srcpath is specialcased - |
|
|
716 | instead of failing, "rename" is called on the absolute path of $wd. |
| 599 | |
717 | |
| 600 | aio_mkdir $pathname, $mode, $callback->($status) |
718 | aio_mkdir $pathname, $mode, $callback->($status) |
| 601 | Asynchronously mkdir (create) a directory and call the callback with |
719 | Asynchronously mkdir (create) a directory and call the callback with |
| 602 | the result code. $mode will be modified by the umask at the time the |
720 | the result code. $mode will be modified by the umask at the time the |
| 603 | request is executed, so do not change your umask. |
721 | request is executed, so do not change your umask. |
| 604 | |
722 | |
| 605 | aio_rmdir $pathname, $callback->($status) |
723 | aio_rmdir $pathname, $callback->($status) |
| 606 | Asynchronously rmdir (delete) a directory and call the callback with |
724 | Asynchronously rmdir (delete) a directory and call the callback with |
| 607 | the result code. |
725 | the result code. |
|
|
726 | |
|
|
727 | On systems that support the AIO::WD working directory abstraction |
|
|
728 | natively, the case "[$wd, "."]" is specialcased - instead of |
|
|
729 | failing, "rmdir" is called on the absolute path of $wd. |
| 608 | |
730 | |
| 609 | aio_readdir $pathname, $callback->($entries) |
731 | aio_readdir $pathname, $callback->($entries) |
| 610 | Unlike the POSIX call of the same name, "aio_readdir" reads an |
732 | Unlike the POSIX call of the same name, "aio_readdir" reads an |
| 611 | entire directory (i.e. opendir + readdir + closedir). The entries |
733 | entire directory (i.e. opendir + readdir + closedir). The entries |
| 612 | will not be sorted, and will NOT include the "." and ".." entries. |
734 | will not be sorted, and will NOT include the "." and ".." entries. |
| … | |
… | |
| 835 | |
957 | |
| 836 | It touches (reads or writes) all memory pages in the specified range |
958 | It touches (reads or writes) all memory pages in the specified range |
| 837 | inside the scalar. All caveats and parameters are the same as for |
959 | inside the scalar. All caveats and parameters are the same as for |
| 838 | "aio_msync", above, except for flags, which must be either 0 (which |
960 | "aio_msync", above, except for flags, which must be either 0 (which |
| 839 | reads all pages and ensures they are instantiated) or |
961 | reads all pages and ensures they are instantiated) or |
| 840 | "IO::AIO::MT_MODIFY", which modifies the memory page s(by reading |
962 | "IO::AIO::MT_MODIFY", which modifies the memory pages (by reading |
| 841 | and writing an octet from it, which dirties the page). |
963 | and writing an octet from it, which dirties the page). |
| 842 | |
964 | |
| 843 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
965 | aio_mlock $scalar, $offset = 0, $length = undef, $callback->($status) |
| 844 | This is a rather advanced IO::AIO call, which works best on |
966 | This is a rather advanced IO::AIO call, which works best on |
| 845 | mmap(2)ed scalars. |
967 | mmap(2)ed scalars. |
| … | |
… | |
| 879 | memory. |
1001 | memory. |
| 880 | |
1002 | |
| 881 | aio_mlockall IO::AIO::MCL_FUTURE; |
1003 | aio_mlockall IO::AIO::MCL_FUTURE; |
| 882 | |
1004 | |
| 883 | aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
1005 | aio_fiemap $fh, $start, $length, $flags, $count, $cb->(\@extents) |
| 884 | Queries the extents of the given file (by calling the Linux FIEMAP |
1006 | Queries the extents of the given file (by calling the Linux "FIEMAP" |
| 885 | ioctl, see <http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for |
1007 | ioctl, see <http://cvs.schmorp.de/IO-AIO/doc/fiemap.txt> for |
| 886 | details). If the "ioctl" is not available on your OS, then this |
1008 | details). If the ioctl is not available on your OS, then this |
| 887 | rquiest will fail with "ENOSYS". |
1009 | request will fail with "ENOSYS". |
| 888 | |
1010 | |
| 889 | $start is the starting offset to query extents for, $length is the |
1011 | $start is the starting offset to query extents for, $length is the |
| 890 | size of the range to query - if it is "undef", then the whole file |
1012 | size of the range to query - if it is "undef", then the whole file |
| 891 | will be queried. |
1013 | will be queried. |
| 892 | |
1014 | |
| … | |
… | |
| 894 | "IO::AIO::FIEMAP_FLAG_XATTR" - "IO::AIO::FIEMAP_FLAGS_COMPAT" is |
1016 | "IO::AIO::FIEMAP_FLAG_XATTR" - "IO::AIO::FIEMAP_FLAGS_COMPAT" is |
| 895 | also exported), and is normally 0 or "IO::AIO::FIEMAP_FLAG_SYNC" to |
1017 | also exported), and is normally 0 or "IO::AIO::FIEMAP_FLAG_SYNC" to |
| 896 | query the data portion. |
1018 | query the data portion. |
| 897 | |
1019 | |
| 898 | $count is the maximum number of extent records to return. If it is |
1020 | $count is the maximum number of extent records to return. If it is |
| 899 | "undef", then IO::AIO queries all extents of the file. As a very |
1021 | "undef", then IO::AIO queries all extents of the range. As a very |
| 900 | special case, if it is 0, then the callback receives the number of |
1022 | special case, if it is 0, then the callback receives the number of |
| 901 | extents instead of the extents themselves. |
1023 | extents instead of the extents themselves (which is unreliable, see |
|
|
1024 | below). |
| 902 | |
1025 | |
| 903 | If an error occurs, the callback receives no arguments. The special |
1026 | If an error occurs, the callback receives no arguments. The special |
| 904 | "errno" value "IO::AIO::EBADR" is available to test for flag errors. |
1027 | "errno" value "IO::AIO::EBADR" is available to test for flag errors. |
| 905 | |
1028 | |
| 906 | Otherwise, the callback receives an array reference with extent |
1029 | Otherwise, the callback receives an array reference with extent |
| … | |
… | |
| 908 | the following members: |
1031 | the following members: |
| 909 | |
1032 | |
| 910 | [$logical, $physical, $length, $flags] |
1033 | [$logical, $physical, $length, $flags] |
| 911 | |
1034 | |
| 912 | Flags is any combination of the following flag values (typically |
1035 | Flags is any combination of the following flag values (typically |
| 913 | either 0 or "IO::AIO::FIEMAP_EXTENT_LAST"): |
1036 | either 0 or "IO::AIO::FIEMAP_EXTENT_LAST" (1)): |
| 914 | |
1037 | |
| 915 | "IO::AIO::FIEMAP_EXTENT_LAST", "IO::AIO::FIEMAP_EXTENT_UNKNOWN", |
1038 | "IO::AIO::FIEMAP_EXTENT_LAST", "IO::AIO::FIEMAP_EXTENT_UNKNOWN", |
| 916 | "IO::AIO::FIEMAP_EXTENT_DELALLOC", "IO::AIO::FIEMAP_EXTENT_ENCODED", |
1039 | "IO::AIO::FIEMAP_EXTENT_DELALLOC", "IO::AIO::FIEMAP_EXTENT_ENCODED", |
| 917 | "IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED", |
1040 | "IO::AIO::FIEMAP_EXTENT_DATA_ENCRYPTED", |
| 918 | "IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED", |
1041 | "IO::AIO::FIEMAP_EXTENT_NOT_ALIGNED", |
| 919 | "IO::AIO::FIEMAP_EXTENT_DATA_INLINE", |
1042 | "IO::AIO::FIEMAP_EXTENT_DATA_INLINE", |
| 920 | "IO::AIO::FIEMAP_EXTENT_DATA_TAIL", |
1043 | "IO::AIO::FIEMAP_EXTENT_DATA_TAIL", |
| 921 | "IO::AIO::FIEMAP_EXTENT_UNWRITTEN", "IO::AIO::FIEMAP_EXTENT_MERGED" |
1044 | "IO::AIO::FIEMAP_EXTENT_UNWRITTEN", "IO::AIO::FIEMAP_EXTENT_MERGED" |
| 922 | or "IO::AIO::FIEMAP_EXTENT_SHARED". |
1045 | or "IO::AIO::FIEMAP_EXTENT_SHARED". |
| 923 | |
1046 | |
|
|
1047 | At the time of this writing (Linux 3.2), this requets is unreliable |
|
|
1048 | unless $count is "undef", as the kernel has all sorts of bugs |
|
|
1049 | preventing it to return all extents of a range for files with large |
|
|
1050 | number of extents. The code works around all these issues if $count |
|
|
1051 | is undef. |
|
|
1052 | |
| 924 | aio_group $callback->(...) |
1053 | aio_group $callback->(...) |
| 925 | This is a very special aio request: Instead of doing something, it |
1054 | This is a very special aio request: Instead of doing something, it |
| 926 | is a container for other aio requests, which is useful if you want |
1055 | is a container for other aio requests, which is useful if you want |
| 927 | to bundle many requests into a single, composite, request with a |
1056 | to bundle many requests into a single, composite, request with a |
| 928 | definite callback and the ability to cancel the whole request with |
1057 | definite callback and the ability to cancel the whole request with |
| … | |
… | |
| 1007 | aio_stat [$etcdir, "passwd"], sub { |
1136 | aio_stat [$etcdir, "passwd"], sub { |
| 1008 | # yay |
1137 | # yay |
| 1009 | }; |
1138 | }; |
| 1010 | }; |
1139 | }; |
| 1011 | |
1140 | |
| 1012 | That "aio_wd" is a request and not a normal function shows that creating |
1141 | The fact that "aio_wd" is a request and not a normal function shows that |
| 1013 | an IO::AIO::WD object is itself a potentially blocking operation, which |
1142 | creating an IO::AIO::WD object is itself a potentially blocking |
| 1014 | is why it is done asynchronously. |
1143 | operation, which is why it is done asynchronously. |
| 1015 | |
1144 | |
| 1016 | To stat the directory obtained with "aio_wd" above, one could write |
1145 | To stat the directory obtained with "aio_wd" above, one could write |
| 1017 | either of the following three request calls: |
1146 | either of the following three request calls: |
| 1018 | |
1147 | |
| 1019 | aio_lstat "/etc" , sub { ... # pathname as normal string |
1148 | aio_lstat "/etc" , sub { ... # pathname as normal string |
| … | |
… | |
| 1039 | will still point to the original directory. Most functions accepting a |
1168 | will still point to the original directory. Most functions accepting a |
| 1040 | pathname will use the directory fd on newer systems, and the string on |
1169 | pathname will use the directory fd on newer systems, and the string on |
| 1041 | older systems. Some functions (such as realpath) will always rely on the |
1170 | older systems. Some functions (such as realpath) will always rely on the |
| 1042 | string form of the pathname. |
1171 | string form of the pathname. |
| 1043 | |
1172 | |
| 1044 | So this fucntionality is mainly useful to get some protection against |
1173 | So this functionality is mainly useful to get some protection against |
| 1045 | "chdir", to easily get an absolute path out of a relative path for |
1174 | "chdir", to easily get an absolute path out of a relative path for |
| 1046 | future reference, and to speed up doing many operations in the same |
1175 | future reference, and to speed up doing many operations in the same |
| 1047 | directory (e.g. when stat'ing all files in a directory). |
1176 | directory (e.g. when stat'ing all files in a directory). |
| 1048 | |
1177 | |
| 1049 | The following functions implement this working directory abstraction: |
1178 | The following functions implement this working directory abstraction: |
| … | |
… | |
| 1059 | Since passing "undef" as working directory component of a pathname |
1188 | Since passing "undef" as working directory component of a pathname |
| 1060 | fails the request with "ENOENT", there is often no need for error |
1189 | fails the request with "ENOENT", there is often no need for error |
| 1061 | checking in the "aio_wd" callback, as future requests using the |
1190 | checking in the "aio_wd" callback, as future requests using the |
| 1062 | value will fail in the expected way. |
1191 | value will fail in the expected way. |
| 1063 | |
1192 | |
| 1064 | If this call isn't available because your OS lacks it or it couldn't |
|
|
| 1065 | be detected, it will be emulated by calling "fsync" instead. |
|
|
| 1066 | |
|
|
| 1067 | IO::AIO::CWD |
1193 | IO::AIO::CWD |
| 1068 | This is a compiletime constant (object) that represents the process |
1194 | This is a compiletime constant (object) that represents the process |
| 1069 | current working directory. |
1195 | current working directory. |
| 1070 | |
1196 | |
| 1071 | Specifying this object as working directory object for a pathname is |
1197 | Specifying this object as working directory object for a pathname is |
| 1072 | as if the pathname would be specified directly, without a directory |
1198 | as if the pathname would be specified directly, without a directory |
| 1073 | object, e.g., these calls are functionally identical: |
1199 | object. For example, these calls are functionally identical: |
| 1074 | |
1200 | |
| 1075 | aio_stat "somefile", sub { ... }; |
1201 | aio_stat "somefile", sub { ... }; |
| 1076 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
1202 | aio_stat [IO::AIO::CWD, "somefile"], sub { ... }; |
|
|
1203 | |
|
|
1204 | To recover the path associated with an IO::AIO::WD object, you can use |
|
|
1205 | "aio_realpath": |
|
|
1206 | |
|
|
1207 | aio_realpath $wd, sub { |
|
|
1208 | warn "path is $_[0]\n"; |
|
|
1209 | }; |
|
|
1210 | |
|
|
1211 | Currently, "aio_statvfs" always, and "aio_rename" and "aio_rmdir" |
|
|
1212 | sometimes, fall back to using an absolue path. |
| 1077 | |
1213 | |
| 1078 | IO::AIO::REQ CLASS |
1214 | IO::AIO::REQ CLASS |
| 1079 | All non-aggregate "aio_*" functions return an object of this class when |
1215 | All non-aggregate "aio_*" functions return an object of this class when |
| 1080 | called in non-void context. |
1216 | called in non-void context. |
| 1081 | |
1217 | |
| … | |
… | |
| 1233 | results. |
1369 | results. |
| 1234 | |
1370 | |
| 1235 | See "poll_cb" for an example. |
1371 | See "poll_cb" for an example. |
| 1236 | |
1372 | |
| 1237 | IO::AIO::poll_cb |
1373 | IO::AIO::poll_cb |
| 1238 | Process some outstanding events on the result pipe. You have to call |
1374 | Process some requests that have reached the result phase (i.e. they |
|
|
1375 | have been executed but the results are not yet reported). You have |
|
|
1376 | to call this "regularly" to finish outstanding requests. |
|
|
1377 | |
| 1239 | this regularly. Returns 0 if all events could be processed (or there |
1378 | Returns 0 if all events could be processed (or there were no events |
| 1240 | were no events to process), or -1 if it returned earlier for |
1379 | to process), or -1 if it returned earlier for whatever reason. |
| 1241 | whatever reason. Returns immediately when no events are outstanding. |
1380 | Returns immediately when no events are outstanding. The amount of |
| 1242 | The amount of events processed depends on the settings of |
1381 | events processed depends on the settings of "IO::AIO::max_poll_req", |
| 1243 | "IO::AIO::max_poll_req" and "IO::AIO::max_poll_time". |
1382 | "IO::AIO::max_poll_time" and "IO::AIO::max_outstanding". |
| 1244 | |
1383 | |
| 1245 | If not all requests were processed for whatever reason, the |
1384 | If not all requests were processed for whatever reason, the poll |
| 1246 | filehandle will still be ready when "poll_cb" returns, so normally |
1385 | file descriptor will still be ready when "poll_cb" returns, so |
| 1247 | you don't have to do anything special to have it called later. |
1386 | normally you don't have to do anything special to have it called |
|
|
1387 | later. |
| 1248 | |
1388 | |
| 1249 | Apart from calling "IO::AIO::poll_cb" when the event filehandle |
1389 | Apart from calling "IO::AIO::poll_cb" when the event filehandle |
| 1250 | becomes ready, it can be beneficial to call this function from loops |
1390 | becomes ready, it can be beneficial to call this function from loops |
| 1251 | which submit a lot of requests, to make sure the results get |
1391 | which submit a lot of requests, to make sure the results get |
| 1252 | processed when they become available and not just when the loop is |
1392 | processed when they become available and not just when the loop is |
| … | |
… | |
| 1260 | Event->io (fd => IO::AIO::poll_fileno, |
1400 | Event->io (fd => IO::AIO::poll_fileno, |
| 1261 | poll => 'r', async => 1, |
1401 | poll => 'r', async => 1, |
| 1262 | cb => \&IO::AIO::poll_cb); |
1402 | cb => \&IO::AIO::poll_cb); |
| 1263 | |
1403 | |
| 1264 | IO::AIO::poll_wait |
1404 | IO::AIO::poll_wait |
| 1265 | If there are any outstanding requests and none of them in the result |
1405 | Wait until either at least one request is in the result phase or no |
| 1266 | phase, wait till the result filehandle becomes ready for reading |
1406 | requests are outstanding anymore. |
| 1267 | (simply does a "select" on the filehandle. This is useful if you |
1407 | |
| 1268 | want to synchronously wait for some requests to finish). |
1408 | This is useful if you want to synchronously wait for some requests |
|
|
1409 | to become ready, without actually handling them. |
| 1269 | |
1410 | |
| 1270 | See "nreqs" for an example. |
1411 | See "nreqs" for an example. |
| 1271 | |
1412 | |
| 1272 | IO::AIO::poll |
1413 | IO::AIO::poll |
| 1273 | Waits until some requests have been handled. |
1414 | Waits until some requests have been handled. |
| … | |
… | |
| 1385 | |
1526 | |
| 1386 | This is a very bad function to use in interactive programs because |
1527 | This is a very bad function to use in interactive programs because |
| 1387 | it blocks, and a bad way to reduce concurrency because it is |
1528 | it blocks, and a bad way to reduce concurrency because it is |
| 1388 | inexact: Better use an "aio_group" together with a feed callback. |
1529 | inexact: Better use an "aio_group" together with a feed callback. |
| 1389 | |
1530 | |
| 1390 | It's main use is in scripts without an event loop - when you want to |
1531 | Its main use is in scripts without an event loop - when you want to |
| 1391 | stat a lot of files, you can write somehting like this: |
1532 | stat a lot of files, you can write somehting like this: |
| 1392 | |
1533 | |
| 1393 | IO::AIO::max_outstanding 32; |
1534 | IO::AIO::max_outstanding 32; |
| 1394 | |
1535 | |
| 1395 | for my $path (...) { |
1536 | for my $path (...) { |
| … | |
… | |
| 1426 | IO::AIO::npending |
1567 | IO::AIO::npending |
| 1427 | Returns the number of requests currently in the pending state |
1568 | Returns the number of requests currently in the pending state |
| 1428 | (executed, but not yet processed by poll_cb). |
1569 | (executed, but not yet processed by poll_cb). |
| 1429 | |
1570 | |
| 1430 | MISCELLANEOUS FUNCTIONS |
1571 | MISCELLANEOUS FUNCTIONS |
| 1431 | IO::AIO implements some functions that might be useful, but are not |
1572 | IO::AIO implements some functions that are useful when you want to use |
| 1432 | asynchronous. |
1573 | some "Advanced I/O" function not available to in Perl, without going the |
|
|
1574 | "Asynchronous I/O" route. Many of these have an asynchronous "aio_*" |
|
|
1575 | counterpart. |
| 1433 | |
1576 | |
| 1434 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
1577 | IO::AIO::sendfile $ofh, $ifh, $offset, $count |
| 1435 | Calls the "eio_sendfile_sync" function, which is like |
1578 | Calls the "eio_sendfile_sync" function, which is like |
| 1436 | "aio_sendfile", but is blocking (this makes most sense if you know |
1579 | "aio_sendfile", but is blocking (this makes most sense if you know |
| 1437 | the input data is likely cached already and the output filehandle is |
1580 | the input data is likely cached already and the output filehandle is |
| … | |
… | |
| 1468 | On systems that do not implement "mprotect", this function returns |
1611 | On systems that do not implement "mprotect", this function returns |
| 1469 | ENOSYS, otherwise the return value of "mprotect". |
1612 | ENOSYS, otherwise the return value of "mprotect". |
| 1470 | |
1613 | |
| 1471 | IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
1614 | IO::AIO::mmap $scalar, $length, $prot, $flags, $fh[, $offset] |
| 1472 | Memory-maps a file (or anonymous memory range) and attaches it to |
1615 | Memory-maps a file (or anonymous memory range) and attaches it to |
| 1473 | the given $scalar, which will act like a string scalar. |
1616 | the given $scalar, which will act like a string scalar. Returns true |
|
|
1617 | on success, and false otherwise. |
| 1474 | |
1618 | |
| 1475 | The only operations allowed on the scalar are "substr"/"vec" that |
1619 | The only operations allowed on the scalar are "substr"/"vec" that |
| 1476 | don't change the string length, and most read-only operations such |
1620 | don't change the string length, and most read-only operations such |
| 1477 | as copying it or searching it with regexes and so on. |
1621 | as copying it or searching it with regexes and so on. |
| 1478 | |
1622 | |
| … | |
… | |
| 1492 | "IO::AIO::PROT_EXEC", "IO::AIO::PROT_READ" and/or |
1636 | "IO::AIO::PROT_EXEC", "IO::AIO::PROT_READ" and/or |
| 1493 | "IO::AIO::PROT_WRITE", |
1637 | "IO::AIO::PROT_WRITE", |
| 1494 | |
1638 | |
| 1495 | $flags can be a combination of "IO::AIO::MAP_SHARED" or |
1639 | $flags can be a combination of "IO::AIO::MAP_SHARED" or |
| 1496 | "IO::AIO::MAP_PRIVATE", or a number of system-specific flags (when |
1640 | "IO::AIO::MAP_PRIVATE", or a number of system-specific flags (when |
| 1497 | not available, the are defined as 0): "IO::AIO::MAP_ANONYMOUS" |
1641 | not available, the are 0): "IO::AIO::MAP_ANONYMOUS" (which is set to |
| 1498 | (which is set to "MAP_ANON" if your system only provides this |
1642 | "MAP_ANON" if your system only provides this constant), |
| 1499 | constant), "IO::AIO::MAP_HUGETLB", "IO::AIO::MAP_LOCKED", |
1643 | "IO::AIO::MAP_HUGETLB", "IO::AIO::MAP_LOCKED", |
| 1500 | "IO::AIO::MAP_NORESERVE", "IO::AIO::MAP_POPULATE" or |
1644 | "IO::AIO::MAP_NORESERVE", "IO::AIO::MAP_POPULATE", |
| 1501 | "IO::AIO::MAP_NONBLOCK" |
1645 | "IO::AIO::MAP_NONBLOCK", "IO::AIO::MAP_FIXED", |
|
|
1646 | "IO::AIO::MAP_GROWSDOWN", "IO::AIO::MAP_32BIT", |
|
|
1647 | "IO::AIO::MAP_HUGETLB" or "IO::AIO::MAP_STACK". |
| 1502 | |
1648 | |
| 1503 | If $fh is "undef", then a file descriptor of -1 is passed. |
1649 | If $fh is "undef", then a file descriptor of -1 is passed. |
| 1504 | |
1650 | |
| 1505 | $offset is the offset from the start of the file - it generally must |
1651 | $offset is the offset from the start of the file - it generally must |
| 1506 | be a multiple of "IO::AIO::PAGESIZE" and defaults to 0. |
1652 | be a multiple of "IO::AIO::PAGESIZE" and defaults to 0. |
| … | |
… | |
| 1528 | IO::AIO::munlockall |
1674 | IO::AIO::munlockall |
| 1529 | Calls the "munlockall" function. |
1675 | Calls the "munlockall" function. |
| 1530 | |
1676 | |
| 1531 | On systems that do not implement "munlockall", this function returns |
1677 | On systems that do not implement "munlockall", this function returns |
| 1532 | ENOSYS, otherwise the return value of "munlockall". |
1678 | ENOSYS, otherwise the return value of "munlockall". |
|
|
1679 | |
|
|
1680 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
1681 | Calls the GNU/Linux splice(2) syscall, if available. If $r_off or |
|
|
1682 | $w_off are "undef", then "NULL" is passed for these, otherwise they |
|
|
1683 | should be the file offset. |
|
|
1684 | |
|
|
1685 | $r_fh and $w_fh should not refer to the same file, as splice might |
|
|
1686 | silently corrupt the data in this case. |
|
|
1687 | |
|
|
1688 | The following symbol flag values are available: |
|
|
1689 | "IO::AIO::SPLICE_F_MOVE", "IO::AIO::SPLICE_F_NONBLOCK", |
|
|
1690 | "IO::AIO::SPLICE_F_MORE" and "IO::AIO::SPLICE_F_GIFT". |
|
|
1691 | |
|
|
1692 | See the splice(2) manpage for details. |
|
|
1693 | |
|
|
1694 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
1695 | Calls the GNU/Linux tee(2) syscall, see its manpage and the |
|
|
1696 | description for "IO::AIO::splice" above for details. |
|
|
1697 | |
|
|
1698 | $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
1699 | Attempts to query or change the pipe buffer size. Obviously works |
|
|
1700 | only on pipes, and currently works only on GNU/Linux systems, and |
|
|
1701 | fails with -1/"ENOSYS" everywhere else. If anybody knows how to |
|
|
1702 | influence pipe buffer size on other systems, drop me a note. |
|
|
1703 | |
|
|
1704 | ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
1705 | This is a direct interface to the Linux pipe2(2) system call. If |
|
|
1706 | $flags is missing or 0, then this should be the same as a call to |
|
|
1707 | perl's built-in "pipe" function and create a new pipe, and works on |
|
|
1708 | systems that lack the pipe2 syscall. On win32, this case invokes |
|
|
1709 | "_pipe (..., 4096, O_BINARY)". |
|
|
1710 | |
|
|
1711 | If $flags is non-zero, it tries to invoke the pipe2 system call with |
|
|
1712 | the given flags (Linux 2.6.27, glibc 2.9). |
|
|
1713 | |
|
|
1714 | On success, the read and write file handles are returned. |
|
|
1715 | |
|
|
1716 | On error, nothing will be returned. If the pipe2 syscall is missing |
|
|
1717 | and $flags is non-zero, fails with "ENOSYS". |
|
|
1718 | |
|
|
1719 | Please refer to pipe2(2) for more info on the $flags, but at the |
|
|
1720 | time of this writing, "IO::AIO::O_CLOEXEC", "IO::AIO::O_NONBLOCK" |
|
|
1721 | and "IO::AIO::O_DIRECT" (Linux 3.4, for packet-based pipes) were |
|
|
1722 | supported. |
| 1533 | |
1723 | |
| 1534 | EVENT LOOP INTEGRATION |
1724 | EVENT LOOP INTEGRATION |
| 1535 | It is recommended to use AnyEvent::AIO to integrate IO::AIO |
1725 | It is recommended to use AnyEvent::AIO to integrate IO::AIO |
| 1536 | automatically into many event loops: |
1726 | automatically into many event loops: |
| 1537 | |
1727 | |
