… | |
… | |
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 | |
231 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
234 | IO::AIO::mmap $scalar, $length, $prot, $flags[, $fh[, $offset]] |
232 | IO::AIO::munmap $scalar |
235 | IO::AIO::munmap $scalar |
233 | IO::AIO::mremap $scalar, $new_length, $flags[, $new_address] |
236 | IO::AIO::mremap $scalar, $new_length, $flags[, $new_address] |
234 | IO::AIO::madvise $scalar, $offset, $length, $advice |
237 | IO::AIO::madvise $scalar, $offset, $length, $advice |
235 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
238 | IO::AIO::mprotect $scalar, $offset, $length, $protect |
236 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
239 | IO::AIO::munlock $scalar, $offset = 0, $length = undef |
237 | IO::AIO::munlockall |
240 | IO::AIO::munlockall |
|
|
241 | |
|
|
242 | # stat extensions |
|
|
243 | $counter = IO::AIO::st_gen |
|
|
244 | $seconds = IO::AIO::st_atime, IO::AIO::st_mtime, IO::AIO::st_ctime, IO::AIO::st_btime |
|
|
245 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
|
|
246 | $nanoseconds = IO::AIO::st_atimensec, IO::AIO::st_mtimensec, IO::AIO::st_ctimensec, IO::AIO::st_btimensec |
|
|
247 | $seconds = IO::AIO::st_btimesec |
|
|
248 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtimensec |
|
|
249 | |
|
|
250 | # very much unportable syscalls |
|
|
251 | IO::AIO::accept4 $r_fh, $sockaddr, $sockaddr_len, $flags |
|
|
252 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
|
|
253 | IO::AIO::tee $r_fh, $w_fh, $length, $flags |
|
|
254 | $actual_size = IO::AIO::pipesize $r_fh[, $new_size] |
|
|
255 | ($rfh, $wfh) = IO::AIO::pipe2 [$flags] |
|
|
256 | $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
257 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
|
|
258 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
|
|
259 | ($cur_interval, $cur_value) = IO::AIO::timerfd_settime $fh, $flags, $new_interval, $nbw_value |
|
|
260 | ($cur_interval, $cur_value) = IO::AIO::timerfd_gettime $fh |
238 | |
261 | |
239 | API NOTES |
262 | API NOTES |
240 | All the "aio_*" calls are more or less thin wrappers around the syscall |
263 | All the "aio_*" calls are more or less thin wrappers around the syscall |
241 | with the same name (sans "aio_"). The arguments are similar or |
264 | with the same name (sans "aio_"). The arguments are similar or |
242 | identical, and they all accept an additional (and optional) $callback |
265 | identical, and they all accept an additional (and optional) $callback |
… | |
… | |
887 | So in general, you should only use these calls for things that do |
910 | So in general, you should only use these calls for things that do |
888 | (filesystem) I/O, not for things that wait for other events |
911 | (filesystem) I/O, not for things that wait for other events |
889 | (network, other processes), although if you are careful and know |
912 | (network, other processes), although if you are careful and know |
890 | what you are doing, you still can. |
913 | what you are doing, you still can. |
891 | |
914 | |
892 | The following constants are available (missing ones are, as usual |
915 | The following constants are available and can be used for normal |
893 | 0): |
916 | "ioctl" and "fcntl" as well (missing ones are, as usual 0): |
894 | |
917 | |
895 | "F_DUPFD_CLOEXEC", |
918 | "F_DUPFD_CLOEXEC", |
896 | |
919 | |
897 | "F_OFD_GETLK", "F_OFD_SETLK", "F_OFD_GETLKW", |
920 | "F_OFD_GETLK", "F_OFD_SETLK", "F_OFD_GETLKW", |
898 | |
921 | |
899 | "FIFREEZE", "FITHAW", "FITRIM", "FICLONE", "FICLONERANGE", |
922 | "FIFREEZE", "FITHAW", "FITRIM", "FICLONE", "FICLONERANGE", |
900 | "FIDEDUPERANGE". |
923 | "FIDEDUPERANGE". |
|
|
924 | |
|
|
925 | "F_ADD_SEALS", "F_GET_SEALS", "F_SEAL_SEAL", "F_SEAL_SHRINK", |
|
|
926 | "F_SEAL_GROW" and "F_SEAL_WRITE". |
901 | |
927 | |
902 | "FS_IOC_GETFLAGS", "FS_IOC_SETFLAGS", "FS_IOC_GETVERSION", |
928 | "FS_IOC_GETFLAGS", "FS_IOC_SETFLAGS", "FS_IOC_GETVERSION", |
903 | "FS_IOC_SETVERSION", "FS_IOC_FIEMAP". |
929 | "FS_IOC_SETVERSION", "FS_IOC_FIEMAP". |
904 | |
930 | |
905 | "FS_IOC_FSGETXATTR", "FS_IOC_FSSETXATTR", |
931 | "FS_IOC_FSGETXATTR", "FS_IOC_FSSETXATTR", |
… | |
… | |
1221 | fails the request with "ENOENT", there is often no need for error |
1247 | fails the request with "ENOENT", there is often no need for error |
1222 | checking in the "aio_wd" callback, as future requests using the |
1248 | checking in the "aio_wd" callback, as future requests using the |
1223 | value will fail in the expected way. |
1249 | value will fail in the expected way. |
1224 | |
1250 | |
1225 | IO::AIO::CWD |
1251 | IO::AIO::CWD |
1226 | This is a compiletime constant (object) that represents the process |
1252 | This is a compile time constant (object) that represents the process |
1227 | current working directory. |
1253 | current working directory. |
1228 | |
1254 | |
1229 | Specifying this object as working directory object for a pathname is |
1255 | Specifying this object as working directory object for a pathname is |
1230 | as if the pathname would be specified directly, without a directory |
1256 | as if the pathname would be specified directly, without a directory |
1231 | object. For example, these calls are functionally identical: |
1257 | object. For example, these calls are functionally identical: |
… | |
… | |
1641 | below, for full accuracy. |
1667 | below, for full accuracy. |
1642 | |
1668 | |
1643 | File birth time is only available when the OS and perl support it |
1669 | File birth time is only available when the OS and perl support it |
1644 | (on FreeBSD and NetBSD at the time of this writing, although support |
1670 | (on FreeBSD and NetBSD at the time of this writing, although support |
1645 | is adaptive, so if your OS/perl gains support, IO::AIO can take |
1671 | is adaptive, so if your OS/perl gains support, IO::AIO can take |
1646 | avdantage of it). On systems where it isn't available, 0 is |
1672 | advantage of it). On systems where it isn't available, 0 is |
1647 | currently returned, but this might change to "undef" in a future |
1673 | currently returned, but this might change to "undef" in a future |
1648 | version. |
1674 | version. |
1649 | |
1675 | |
1650 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
1676 | ($atime, $mtime, $ctime, $btime, ...) = IO::AIO::st_xtime |
1651 | Returns access, modification, change and birth time all in one go, |
1677 | Returns access, modification, change and birth time all in one go, |
… | |
… | |
1701 | some "Advanced I/O" function not available to in Perl, without going the |
1727 | some "Advanced I/O" function not available to in Perl, without going the |
1702 | "Asynchronous I/O" route. Many of these have an asynchronous "aio_*" |
1728 | "Asynchronous I/O" route. Many of these have an asynchronous "aio_*" |
1703 | counterpart. |
1729 | counterpart. |
1704 | |
1730 | |
1705 | $numfd = IO::AIO::get_fdlimit |
1731 | $numfd = IO::AIO::get_fdlimit |
1706 | This function is *EXPERIMENTAL* and subject to change. |
|
|
1707 | |
|
|
1708 | Tries to find the current file descriptor limit and returns it, or |
1732 | Tries to find the current file descriptor limit and returns it, or |
1709 | "undef" and sets $! in case of an error. The limit is one larger |
1733 | "undef" and sets $! in case of an error. The limit is one larger |
1710 | than the highest valid file descriptor number. |
1734 | than the highest valid file descriptor number. |
1711 | |
1735 | |
1712 | IO::AIO::min_fdlimit [$numfd] |
1736 | IO::AIO::min_fdlimit [$numfd] |
1713 | This function is *EXPERIMENTAL* and subject to change. |
|
|
1714 | |
|
|
1715 | Try to increase the current file descriptor limit(s) to at least |
1737 | Try to increase the current file descriptor limit(s) to at least |
1716 | $numfd by changing the soft or hard file descriptor resource limit. |
1738 | $numfd by changing the soft or hard file descriptor resource limit. |
1717 | If $numfd is missing, it will try to set a very high limit, although |
1739 | If $numfd is missing, it will try to set a very high limit, although |
1718 | this is not recommended when you know the actual minimum that you |
1740 | this is not recommended when you know the actual minimum that you |
1719 | require. |
1741 | require. |
… | |
… | |
1868 | Calls the "munlockall" function. |
1890 | Calls the "munlockall" function. |
1869 | |
1891 | |
1870 | On systems that do not implement "munlockall", this function returns |
1892 | On systems that do not implement "munlockall", this function returns |
1871 | ENOSYS, otherwise the return value of "munlockall". |
1893 | ENOSYS, otherwise the return value of "munlockall". |
1872 | |
1894 | |
|
|
1895 | $fh = IO::AIO::accept4 $r_fh, $sockaddr, $sockaddr_maxlen, $flags |
|
|
1896 | Uses the GNU/Linux accept4(2) syscall, if available, to accept a |
|
|
1897 | socket and return the new file handle on success, or sets $! and |
|
|
1898 | returns "undef" on error. |
|
|
1899 | |
|
|
1900 | The remote name of the new socket will be stored in $sockaddr, which |
|
|
1901 | will be extended to allow for at least $sockaddr_maxlen octets. If |
|
|
1902 | the socket name does not fit into $sockaddr_maxlen octets, this is |
|
|
1903 | signaled by returning a longer string in $sockaddr, which might or |
|
|
1904 | might not be truncated. |
|
|
1905 | |
|
|
1906 | To accept name-less sockets, use "undef" for $sockaddr and 0 for |
|
|
1907 | $sockaddr_maxlen. |
|
|
1908 | |
|
|
1909 | The main reasons to use this syscall rather than portable accept(2) |
|
|
1910 | are that you can specify "SOCK_NONBLOCK" and/or "SOCK_CLOEXEC" flags |
|
|
1911 | and you can accept name-less sockets by specifying 0 for |
|
|
1912 | $sockaddr_maxlen, which is sadly not possible with perl's interface |
|
|
1913 | to "accept". |
|
|
1914 | |
1873 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
1915 | IO::AIO::splice $r_fh, $r_off, $w_fh, $w_off, $length, $flags |
1874 | Calls the GNU/Linux splice(2) syscall, if available. If $r_off or |
1916 | Calls the GNU/Linux splice(2) syscall, if available. If $r_off or |
1875 | $w_off are "undef", then "NULL" is passed for these, otherwise they |
1917 | $w_off are "undef", then "NULL" is passed for these, otherwise they |
1876 | should be the file offset. |
1918 | should be the file offset. |
1877 | |
1919 | |
… | |
… | |
1917 | Example: create a pipe race-free w.r.t. threads and fork: |
1959 | Example: create a pipe race-free w.r.t. threads and fork: |
1918 | |
1960 | |
1919 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
1961 | my ($rfh, $wfh) = IO::AIO::pipe2 IO::AIO::O_CLOEXEC |
1920 | or die "pipe2: $!\n"; |
1962 | or die "pipe2: $!\n"; |
1921 | |
1963 | |
|
|
1964 | $fh = IO::AIO::memfd_create $pathname[, $flags] |
|
|
1965 | This is a direct interface to the Linux memfd_create(2) system call. |
|
|
1966 | The (unhelpful) default for $flags is 0, but your default should be |
|
|
1967 | "IO::AIO::MFD_CLOEXEC". |
|
|
1968 | |
|
|
1969 | On success, the new memfd filehandle is returned, otherwise returns |
|
|
1970 | "undef". If the memfd_create syscall is missing, fails with |
|
|
1971 | "ENOSYS". |
|
|
1972 | |
|
|
1973 | Please refer to memfd_create(2) for more info on this call. |
|
|
1974 | |
|
|
1975 | The following $flags values are available: "IO::AIO::MFD_CLOEXEC", |
|
|
1976 | "IO::AIO::MFD_ALLOW_SEALING" and "IO::AIO::MFD_HUGETLB". |
|
|
1977 | |
|
|
1978 | Example: create a new memfd. |
|
|
1979 | |
|
|
1980 | my $fh = IO::AIO::memfd_create "somenameforprocfd", IO::AIO::MFD_CLOEXEC |
|
|
1981 | or die "memfd_create: $!\n"; |
|
|
1982 | |
|
|
1983 | $fh = IO::AIO::pidfd_open $pid[, $flags] |
|
|
1984 | This is an interface to the Linux pidfd_open(2) system call. The |
|
|
1985 | default for $flags is 0. |
|
|
1986 | |
|
|
1987 | On success, a new pidfd filehandle is returned (that is already set |
|
|
1988 | to close-on-exec), otherwise returns "undef". If the syscall is |
|
|
1989 | missing, fails with "ENOSYS". |
|
|
1990 | |
|
|
1991 | Example: open pid 6341 as pidfd. |
|
|
1992 | |
|
|
1993 | my $fh = IO::AIO::pidfd_open 6341 |
|
|
1994 | or die "pidfd_open: $!\n"; |
|
|
1995 | |
|
|
1996 | $status = IO::AIO::pidfd_send_signal $pidfh, $signal[, $siginfo[, |
|
|
1997 | $flags]] |
|
|
1998 | This is an interface to the Linux pidfd_send_signal system call. The |
|
|
1999 | default for $siginfo is "undef" and the default for $flags is 0. |
|
|
2000 | |
|
|
2001 | Returns the system call status. If the syscall is missing, fails |
|
|
2002 | with "ENOSYS". |
|
|
2003 | |
|
|
2004 | When specified, $siginfo must be a reference to a hash with one or |
|
|
2005 | more of the following members: |
|
|
2006 | |
|
|
2007 | code - the "si_code" member |
|
|
2008 | pid - the "si_pid" member |
|
|
2009 | uid - the "si_uid" member |
|
|
2010 | value_int - the "si_value.sival_int" member |
|
|
2011 | value_ptr - the "si_value.sival_ptr" member, specified as an integer |
|
|
2012 | |
|
|
2013 | Example: send a SIGKILL to the specified process. |
|
|
2014 | |
|
|
2015 | my $status = IO::AIO::pidfd_send_signal $pidfh, 9, undef |
|
|
2016 | and die "pidfd_send_signal: $!\n"; |
|
|
2017 | |
|
|
2018 | Example: send a SIGKILL to the specified process with extra data. |
|
|
2019 | |
|
|
2020 | my $status = IO::AIO::pidfd_send_signal $pidfh, 9, { code => -1, value_int => 7 } |
|
|
2021 | and die "pidfd_send_signal: $!\n"; |
|
|
2022 | |
|
|
2023 | $fh = IO::AIO::pidfd_getfd $pidfh, $targetfd[, $flags] |
|
|
2024 | This is an interface to the Linux pidfd_getfd system call. The |
|
|
2025 | default for $flags is 0. |
|
|
2026 | |
|
|
2027 | On success, returns a dup'ed copy of the target file descriptor |
|
|
2028 | (specified as an integer) returned (that is already set to |
|
|
2029 | close-on-exec), otherwise returns "undef". If the syscall is |
|
|
2030 | missing, fails with "ENOSYS". |
|
|
2031 | |
|
|
2032 | Example: get a copy of standard error of another process and print |
|
|
2033 | soemthing to it. |
|
|
2034 | |
|
|
2035 | my $errfh = IO::AIO::pidfd_getfd $pidfh, 2 |
|
|
2036 | or die "pidfd_getfd: $!\n"; |
|
|
2037 | print $errfh "stderr\n"; |
|
|
2038 | |
1922 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
2039 | $fh = IO::AIO::eventfd [$initval, [$flags]] |
1923 | This is a direct interface to the Linux eventfd(2) system call. The |
2040 | This is a direct interface to the Linux eventfd(2) system call. The |
1924 | (unhelpful) defaults for $initval and $flags are 0 for both. |
2041 | (unhelpful) defaults for $initval and $flags are 0 for both. |
1925 | |
2042 | |
1926 | On success, the new eventfd filehandle is returned, otherwise |
2043 | On success, the new eventfd filehandle is returned, otherwise |
… | |
… | |
1933 | "IO::AIO::EFD_CLOEXEC", "IO::AIO::EFD_NONBLOCK" and |
2050 | "IO::AIO::EFD_CLOEXEC", "IO::AIO::EFD_NONBLOCK" and |
1934 | "IO::AIO::EFD_SEMAPHORE" (Linux 2.6.30). |
2051 | "IO::AIO::EFD_SEMAPHORE" (Linux 2.6.30). |
1935 | |
2052 | |
1936 | Example: create a new eventfd filehandle: |
2053 | Example: create a new eventfd filehandle: |
1937 | |
2054 | |
1938 | $fh = IO::AIO::eventfd 0, IO::AIO::O_CLOEXEC |
2055 | $fh = IO::AIO::eventfd 0, IO::AIO::EFD_CLOEXEC |
1939 | or die "eventfd: $!\n"; |
2056 | or die "eventfd: $!\n"; |
1940 | |
2057 | |
1941 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
2058 | $fh = IO::AIO::timerfd_create $clockid[, $flags] |
1942 | This is a direct interface to the Linux timerfd_create(2) system |
2059 | This is a direct interface to the Linux timerfd_create(2) system |
1943 | call. The (unhelpful) default for $flags is 0. |
2060 | call. The (unhelpful) default for $flags is 0, but your default |
|
|
2061 | should be "IO::AIO::TFD_CLOEXEC". |
1944 | |
2062 | |
1945 | On success, the new timerfd filehandle is returned, otherwise |
2063 | On success, the new timerfd filehandle is returned, otherwise |
1946 | returns "undef". If the eventfd syscall is missing, fails with |
2064 | returns "undef". If the timerfd_create syscall is missing, fails |
1947 | "ENOSYS". |
2065 | with "ENOSYS". |
1948 | |
2066 | |
1949 | Please refer to timerfd_create(2) for more info on this call. |
2067 | Please refer to timerfd_create(2) for more info on this call. |
1950 | |
2068 | |
1951 | The following $clockid values are available: |
2069 | The following $clockid values are available: |
1952 | "IO::AIO::CLOCK_REALTIME", "IO::AIO::CLOCK_MONOTONIC" |
2070 | "IO::AIO::CLOCK_REALTIME", "IO::AIO::CLOCK_MONOTONIC" |
… | |
… | |
2095 | I am not sure anything can be done about this, so this is considered a |
2213 | I am not sure anything can be done about this, so this is considered a |
2096 | known issue, rather than a bug. |
2214 | known issue, rather than a bug. |
2097 | |
2215 | |
2098 | SEE ALSO |
2216 | SEE ALSO |
2099 | AnyEvent::AIO for easy integration into event loops, Coro::AIO for a |
2217 | AnyEvent::AIO for easy integration into event loops, Coro::AIO for a |
2100 | more natural syntax. |
2218 | more natural syntax and IO::FDPass for file descriptor passing. |
2101 | |
2219 | |
2102 | AUTHOR |
2220 | AUTHOR |
2103 | Marc Lehmann <schmorp@schmorp.de> |
2221 | Marc Lehmann <schmorp@schmorp.de> |
2104 | http://home.schmorp.de/ |
2222 | http://home.schmorp.de/ |
2105 | |
2223 | |