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199 <h1>Class <code>nixio</code></h1>
202 General POSIX IO library.</p>
211 <table class="function_list">
214 <td class="name" nowrap><a href="#nixio.bind">bind</a> (host, port, family, socktype)</td>
216 Create a new socket and bind it to a network address.</td>
220 <td class="name" nowrap><a href="#nixio.chdir">chdir</a> (path)</td>
222 Change the working directory.</td>
226 <td class="name" nowrap><a href="#nixio.closelog">closelog</a> ()</td>
228 (POSIX) Close the connection to the system logger.</td>
232 <td class="name" nowrap><a href="#nixio.connect">connect</a> (host, port, family, socktype)</td>
234 Create a new socket and connect to a network address.</td>
238 <td class="name" nowrap><a href="#nixio.crypt">crypt</a> (key, salt)</td>
240 (POSIX) Encrypt a user password.</td>
244 <td class="name" nowrap><a href="#nixio.dup">dup</a> (oldfd, newfd)</td>
246 Duplicate a file descriptor.</td>
250 <td class="name" nowrap><a href="#nixio.errno">errno</a> ()</td>
252 Get the last system error code.</td>
256 <td class="name" nowrap><a href="#nixio.exec">exec</a> (executable, ...)</td>
258 Execute a file to replace the current process.</td>
262 <td class="name" nowrap><a href="#nixio.exece">exece</a> (executable, arguments, environment)</td>
264 Execute a file with a custom environment to replace the current process.</td>
268 <td class="name" nowrap><a href="#nixio.execp">execp</a> (executable, ...)</td>
270 Invoke the shell and execute a file to replace the current process.</td>
274 <td class="name" nowrap><a href="#nixio.fork">fork</a> ()</td>
276 (POSIX) Clone the current process.</td>
280 <td class="name" nowrap><a href="#nixio.getaddrinfo">getaddrinfo</a> (host, family, service)</td>
282 Look up a hostname and service via DNS.</td>
286 <td class="name" nowrap><a href="#nixio.getcwd">getcwd</a> ()</td>
288 Get the current working directory.</td>
292 <td class="name" nowrap><a href="#nixio.getenv">getenv</a> (variable)</td>
294 Get the current environment table or a specific environment variable.</td>
298 <td class="name" nowrap><a href="#nixio.getgid">getgid</a> ()</td>
300 (POSIX) Get the group id of the current process.</td>
304 <td class="name" nowrap><a href="#nixio.getgr">getgr</a> (group)</td>
306 (POSIX) Get all or a specific user group.</td>
310 <td class="name" nowrap><a href="#nixio.getifaddrs">getifaddrs</a> ()</td>
312 (Linux, BSD) Get a list of available network interfaces and their addresses.</td>
316 <td class="name" nowrap><a href="#nixio.getnameinfo">getnameinfo</a> (ipaddr)</td>
318 Reverse look up an IP-Address via DNS.</td>
322 <td class="name" nowrap><a href="#nixio.getpid">getpid</a> ()</td>
324 Get the ID of the current process.</td>
328 <td class="name" nowrap><a href="#nixio.getppid">getppid</a> ()</td>
330 (POSIX) Get the parent process id of the current process.</td>
334 <td class="name" nowrap><a href="#nixio.getproto">getproto</a> (proto)</td>
336 Get all or a specifc proto entry.</td>
340 <td class="name" nowrap><a href="#nixio.getprotobyname">getprotobyname</a> (name)</td>
342 Get protocol entry by name.</td>
346 <td class="name" nowrap><a href="#nixio.getprotobynumber">getprotobynumber</a> (proto)</td>
348 Get protocol entry by number.</td>
352 <td class="name" nowrap><a href="#nixio.getpw">getpw</a> (user)</td>
354 (POSIX) Get all or a specific user account.</td>
358 <td class="name" nowrap><a href="#nixio.getsp">getsp</a> (user)</td>
360 (Linux, Solaris) Get all or a specific shadow password entry.</td>
364 <td class="name" nowrap><a href="#nixio.getuid">getuid</a> ()</td>
366 (POSIX) Get the user id of the current process.</td>
370 <td class="name" nowrap><a href="#nixio.kill">kill</a> (target, signal)</td>
372 (POSIX) Send a signal to one or more processes.</td>
376 <td class="name" nowrap><a href="#nixio.nanosleep">nanosleep</a> (seconds, nanoseconds)</td>
378 Sleep for a specified amount of time.</td>
382 <td class="name" nowrap><a href="#nixio.nice">nice</a> (nice)</td>
384 (POSIX) Change priority of current process.</td>
388 <td class="name" nowrap><a href="#nixio.open">open</a> (path, flags, mode)</td>
394 <td class="name" nowrap><a href="#nixio.open_flags">open_flags</a> (flag1, ...)</td>
396 Generate flags for a call to open().</td>
400 <td class="name" nowrap><a href="#nixio.openlog">openlog</a> (ident, flag1, ...)</td>
402 (POSIX) Open a connection to the system logger.</td>
406 <td class="name" nowrap><a href="#nixio.pipe">pipe</a> ()</td>
412 <td class="name" nowrap><a href="#nixio.poll">poll</a> (fds, timeout)</td>
414 Wait for some event on a file descriptor.</td>
418 <td class="name" nowrap><a href="#nixio.poll_flags">poll_flags</a> (mode1, ...)</td>
420 Generate events-bitfield or parse revents-bitfield for poll.</td>
424 <td class="name" nowrap><a href="#nixio.sendfile">sendfile</a> (socket, file, length)</td>
426 (POSIX) Send data from a file to a socket in kernel-space.</td>
430 <td class="name" nowrap><a href="#nixio.setenv">setenv</a> (variable, value)</td>
432 Set or unset a environment variable.</td>
436 <td class="name" nowrap><a href="#nixio.setgid">setgid</a> (gid)</td>
438 (POSIX) Set the group id of the current process.</td>
442 <td class="name" nowrap><a href="#nixio.setlogmask">setlogmask</a> (priority)</td>
444 (POSIX) Set the logmask of the system logger for current process.</td>
448 <td class="name" nowrap><a href="#nixio.setsid">setsid</a> ()</td>
450 (POSIX) Create a new session and set the process group ID.</td>
454 <td class="name" nowrap><a href="#nixio.setuid">setuid</a> (gid)</td>
456 (POSIX) Set the user id of the current process.</td>
460 <td class="name" nowrap><a href="#nixio.signal">signal</a> (signal, handler)</td>
462 Ignore or use set the default handler for a signal.</td>
466 <td class="name" nowrap><a href="#nixio.socket">socket</a> (domain, type)</td>
468 Create a new socket.</td>
472 <td class="name" nowrap><a href="#nixio.splice">splice</a> (fdin, fdout, length, flags)</td>
474 (Linux) Send data from / to a pipe in kernel-space.</td>
478 <td class="name" nowrap><a href="#nixio.splice_flags">splice_flags</a> (flag1, ...)</td>
480 (Linux) Generate a flag bitfield for a call to splice.</td>
484 <td class="name" nowrap><a href="#nixio.strerror">strerror</a> (errno)</td>
486 Get the error message for the corresponding error code.</td>
490 <td class="name" nowrap><a href="#nixio.sysinfo">sysinfo</a> ()</td>
492 (Linux) Get overall system statistics.</td>
496 <td class="name" nowrap><a href="#nixio.syslog">syslog</a> (priority)</td>
498 (POSIX) Write a message to the system logger.</td>
502 <td class="name" nowrap><a href="#nixio.times">times</a> ()</td>
504 (POSIX) Get process times.</td>
508 <td class="name" nowrap><a href="#nixio.tls">tls</a> (mode)</td>
510 Create a new TLS context.</td>
514 <td class="name" nowrap><a href="#nixio.umask">umask</a> (mask)</td>
516 Sets the file mode creation mask.</td>
520 <td class="name" nowrap><a href="#nixio.uname">uname</a> ()</td>
522 (POSIX) Get information about current system and kernel.</td>
526 <td class="name" nowrap><a href="#nixio.waitpid">waitpid</a> (pid, flag1, ...)</td>
528 (POSIX) Wait for a process to change state.</td>
542 <h2><a name="functions"></a>Functions</h2>
543 <dl class="function">
547 <dt><a name="nixio.bind"></a><strong>bind</strong> (host, port, family, socktype)</dt>
550 Create a new socket and bind it to a network address.
551 This function is a shortcut for calling nixio.socket and then bind()
552 on the socket object.
559 host: Hostname or IP-Address (optional, default: all addresses)
563 port: Port or service description
567 family: Address family [<strong>"any"</strong>, "inet", "inet6"]
571 socktype: Socket Type [<strong>"stream"</strong>, "dgram"]
582 <li>This functions calls getaddrinfo(), socket(),
583 setsockopt() and bind() but NOT listen().
585 <li>The <em>reuseaddr</em>-option is automatically set before binding.
591 <h3>Return value:</h3>
601 <dt><a name="nixio.chdir"></a><strong>chdir</strong> (path)</dt>
604 Change the working directory.
611 path: New working directory
621 <h3>Return value:</h3>
631 <dt><a name="nixio.closelog"></a><strong>closelog</strong> ()</dt>
634 (POSIX) Close the connection to the system logger.
649 <dt><a name="nixio.connect"></a><strong>connect</strong> (host, port, family, socktype)</dt>
652 Create a new socket and connect to a network address.
653 This function is a shortcut for calling nixio.socket and then connect()
654 on the socket object.
661 host: Hostname or IP-Address (optional, default: localhost)
665 port: Port or service description
669 family: Address family [<strong>"any"</strong>, "inet", "inet6"]
673 socktype: Socket Type [<strong>"stream"</strong>, "dgram"]
682 This functions calls getaddrinfo(), socket() and connect().
686 <h3>Return value:</h3>
696 <dt><a name="nixio.crypt"></a><strong>crypt</strong> (key, salt)</dt>
699 (POSIX) Encrypt a user password.
720 <h3>Return value:</h3>
730 <dt><a name="nixio.dup"></a><strong>dup</strong> (oldfd, newfd)</dt>
733 Duplicate a file descriptor.
740 oldfd: Old descriptor [File Object, Socket Object (POSIX only)]
744 newfd: New descriptor to serve as copy (optional)
753 This funcation calls dup2() if <em>newfd</em> is set, otherwise dup().
757 <h3>Return value:</h3>
758 File Object of new descriptor
767 <dt><a name="nixio.errno"></a><strong>errno</strong> ()</dt>
770 Get the last system error code.
778 <h3>Return value:</h3>
788 <dt><a name="nixio.exec"></a><strong>exec</strong> (executable, ...)</dt>
791 Execute a file to replace the current process.
798 executable: Executable
813 <li>The name of the executable is automatically passed as argv[0]
815 <li>This function does not return on success.
828 <dt><a name="nixio.exece"></a><strong>exece</strong> (executable, arguments, environment)</dt>
831 Execute a file with a custom environment to replace the current process.
838 executable: Executable
842 arguments: Argument Table
846 environment: Environment Table (optional)
857 <li>The name of the executable is automatically passed as argv[0]
859 <li>This function does not return on success.
872 <dt><a name="nixio.execp"></a><strong>execp</strong> (executable, ...)</dt>
875 Invoke the shell and execute a file to replace the current process.
882 executable: Executable
897 <li>The name of the executable is automatically passed as argv[0]
899 <li>This function does not return on success.
912 <dt><a name="nixio.fork"></a><strong>fork</strong> ()</dt>
915 (POSIX) Clone the current process.
923 <h3>Return value:</h3>
924 the child process id for the parent process, 0 for the child process
933 <dt><a name="nixio.getaddrinfo"></a><strong>getaddrinfo</strong> (host, family, service)</dt>
936 Look up a hostname and service via DNS.
943 host: hostname to lookup (optional)
947 family: address family [<strong>"any"</strong>, "inet", "inet6"]
951 service: service name or port (optional)
961 <h3>Return value:</h3>
962 Table containing one or more tables containing: <ul>
963 <li>family = ["inet", "inet6"]</li>
964 <li>socktype = ["stream", "dgram", "raw"]</li>
965 <li>address = Resolved IP-Address</li>
966 <li>port = Resolved Port (if service was given)</li>
976 <dt><a name="nixio.getcwd"></a><strong>getcwd</strong> ()</dt>
979 Get the current working directory.
987 <h3>Return value:</h3>
997 <dt><a name="nixio.getenv"></a><strong>getenv</strong> (variable)</dt>
1000 Get the current environment table or a specific environment variable.
1007 variable: Variable (optional)
1017 <h3>Return value:</h3>
1018 environment table or single environment variable
1027 <dt><a name="nixio.getgid"></a><strong>getgid</strong> ()</dt>
1030 (POSIX) Get the group id of the current process.
1038 <h3>Return value:</h3>
1048 <dt><a name="nixio.getgr"></a><strong>getgr</strong> (group)</dt>
1051 (POSIX) Get all or a specific user group.
1058 group: Group ID or groupname (optional)
1068 <h3>Return value:</h3>
1069 Table containing: <ul>
1070 <li>name = Group Name</li>
1071 <li>gid = Group ID</li>
1072 <li>passwd = Password</li>
1073 <li>mem = {Member #1, Member #2, ...}</li>
1083 <dt><a name="nixio.getifaddrs"></a><strong>getifaddrs</strong> ()</dt>
1086 (Linux, BSD) Get a list of available network interfaces and their addresses.
1094 <h3>Return value:</h3>
1095 Table containing one or more tables containing: <ul>
1096 <li>name = Interface Name</li>
1097 <li>family = ["inet", "inet6", "packet"]</li>
1098 <li>addr = Interface Address (IPv4, IPv6, MAC, ...)</li>
1099 <li>broadaddr = Broadcast Address</li>
1100 <li>dstaddr = Destination Address (Point-to-Point)</li>
1101 <li>netmask = Netmask (if available)</li>
1102 <li>prefix = Prefix (if available)</li>
1103 <li>flags = Table of interface flags (up, multicast, loopback, ...)</li>
1104 <li>data = Statistics (Linux, "packet"-family)</li>
1105 <li>hatype = Hardware Type Identifier (Linix, "packet"-family)</li>
1106 <li>ifindex = Interface Index (Linux, "packet"-family)</li>
1116 <dt><a name="nixio.getnameinfo"></a><strong>getnameinfo</strong> (ipaddr)</dt>
1119 Reverse look up an IP-Address via DNS.
1126 ipaddr: IPv4 or IPv6-Address
1136 <h3>Return value:</h3>
1146 <dt><a name="nixio.getpid"></a><strong>getpid</strong> ()</dt>
1149 Get the ID of the current process.
1157 <h3>Return value:</h3>
1167 <dt><a name="nixio.getppid"></a><strong>getppid</strong> ()</dt>
1170 (POSIX) Get the parent process id of the current process.
1178 <h3>Return value:</h3>
1188 <dt><a name="nixio.getproto"></a><strong>getproto</strong> (proto)</dt>
1191 Get all or a specifc proto entry.
1198 proto: protocol number or name to lookup (optional)
1208 <h3>Return value:</h3>
1209 Table (or if no parameter is given, a table of tables)
1210 containing the following fields: <ul>
1211 <li>name = Protocol Name</li>
1212 <li>proto = Protocol Number</li>
1213 <li>aliases = Table of alias names</li>
1223 <dt><a name="nixio.getprotobyname"></a><strong>getprotobyname</strong> (name)</dt>
1226 Get protocol entry by name.
1233 name: protocol name to lookup
1242 This function returns nil if the given protocol is unknown.
1246 <h3>Return value:</h3>
1247 Table containing the following fields: <ul>
1248 <li>name = Protocol Name</li>
1249 <li>proto = Protocol Number</li>
1250 <li>aliases = Table of alias names</li>
1260 <dt><a name="nixio.getprotobynumber"></a><strong>getprotobynumber</strong> (proto)</dt>
1263 Get protocol entry by number.
1270 proto: protocol number to lookup
1279 This function returns nil if the given protocol is unknown.
1283 <h3>Return value:</h3>
1284 Table containing the following fields: <ul>
1285 <li>name = Protocol Name</li>
1286 <li>proto = Protocol Number</li>
1287 <li>aliases = Table of alias names</li>
1297 <dt><a name="nixio.getpw"></a><strong>getpw</strong> (user)</dt>
1300 (POSIX) Get all or a specific user account.
1307 user: User ID or username (optional)
1317 <h3>Return value:</h3>
1318 Table containing: <ul>
1319 <li>name = Name</li>
1321 <li>gid = Group ID</li>
1322 <li>passwd = Password</li>
1323 <li>dir = Home directory</li>
1324 <li>gecos = Information</li>
1325 <li>shell = Shell</li>
1335 <dt><a name="nixio.getsp"></a><strong>getsp</strong> (user)</dt>
1338 (Linux, Solaris) Get all or a specific shadow password entry.
1345 user: username (optional)
1355 <h3>Return value:</h3>
1356 Table containing: <ul>
1357 <li>namp = Name</li>
1358 <li>expire = Expiration Date</li>
1359 <li>flag = Flags</li>
1360 <li>inact = Inactivity Date</li>
1361 <li>lstchg = Last change</li>
1362 <li>max = Maximum</li>
1363 <li>min = Minimum</li>
1364 <li>warn = Warning</li>
1365 <li>pwdp = Password Hash</li>
1375 <dt><a name="nixio.getuid"></a><strong>getuid</strong> ()</dt>
1378 (POSIX) Get the user id of the current process.
1386 <h3>Return value:</h3>
1396 <dt><a name="nixio.kill"></a><strong>kill</strong> (target, signal)</dt>
1399 (POSIX) Send a signal to one or more processes.
1406 target: Target process of process group.
1410 signal: Signal to send
1420 <h3>Return value:</h3>
1430 <dt><a name="nixio.nanosleep"></a><strong>nanosleep</strong> (seconds, nanoseconds)</dt>
1433 Sleep for a specified amount of time.
1440 seconds: Seconds to wait (optional)
1444 nanoseconds: Nanoseconds to wait (optional)
1455 <li>Not all systems support nanosecond precision but you can expect
1456 to have at least maillisecond precision.
1458 <li>This function is not signal-protected and may fail with EINTR.
1464 <h3>Return value:</h3>
1474 <dt><a name="nixio.nice"></a><strong>nice</strong> (nice)</dt>
1477 (POSIX) Change priority of current process.
1494 <h3>Return value:</h3>
1504 <dt><a name="nixio.open"></a><strong>open</strong> (path, flags, mode)</dt>
1514 path: Filesystem path to open
1518 flags: Flag string or number (see open_flags).
1519 [<strong>"r"</strong>, "r+", "w", "w+", "a", "a+"]
1523 mode: File mode for newly created files (see chmod, umask).
1532 Although this function also supports the traditional fopen()
1533 file flags it does not create a file stream but uses the open() syscall.
1537 <h3>Return value:</h3>
1545 <li><a href="#nixio.umask">
1549 <li><a href="#nixio.open_flags">
1560 <dt><a name="nixio.open_flags"></a><strong>open_flags</strong> (flag1, ...)</dt>
1563 Generate flags for a call to open().
1570 flag1: First Flag ["append", "creat", "excl", "nonblock", "ndelay",
1571 "sync", "trunc", "rdonly", "wronly", "rdwr"]
1575 ...: More Flags [-"-]
1586 <li>This function cannot fail and will never return nil.
1588 <li>The "nonblock" and "ndelay" flags are aliases.
1590 <li>The "nonblock", "ndelay" and "sync" flags are no-ops on Windows.
1596 <h3>Return value:</h3>
1597 flag to be used as second paramter to open
1606 <dt><a name="nixio.openlog"></a><strong>openlog</strong> (ident, flag1, ...)</dt>
1609 (POSIX) Open a connection to the system logger.
1620 flag1: Flag 1 ["cons", "nowait", "pid", "perror", "ndelay", "odelay"]
1624 ...: More flags [-"-]
1641 <dt><a name="nixio.pipe"></a><strong>pipe</strong> ()</dt>
1652 <h3>Return values:</h3>
1655 <li>File Object of the read end
1657 <li>File Object of the write end
1668 <dt><a name="nixio.poll"></a><strong>poll</strong> (fds, timeout)</dt>
1671 Wait for some event on a file descriptor.
1672 poll() sets the revents-field of the tables provided by fds to a bitfield
1673 indicating the events that occured.
1680 fds: Table containing one or more tables containing <ul>
1681 <li> fd = I/O Descriptor [Socket Object, File Object (POSIX)]</li>
1682 <li> events = events to wait for (bitfield generated with poll_flags)</li>
1687 timeout: Timeout in milliseconds
1698 <li>This function works in-place on the provided table and only
1699 writes the revents field, you can use other fields on your demand.
1701 <li>All metamethods on the tables provided as fds are ignored.
1703 <li>The revents-fields are not reset when the call times out.
1704 You have to check the first return value to be 0 to handle this case.
1706 <li>If you want to wait on a TLS-Socket you have to use the underlying
1709 <li>On Windows poll is emulated through select(), can only be used
1710 on socket descriptors and cannot take more than 64 descriptors per call.
1712 <li>This function is not signal-protected and may fail with EINTR.
1718 <h3>Return values:</h3>
1721 <li>number of ready IO descriptors
1723 <li>the fds-table with revents-fields set
1732 <li><a href="#nixio.poll_flags">
1743 <dt><a name="nixio.poll_flags"></a><strong>poll_flags</strong> (mode1, ...)</dt>
1746 Generate events-bitfield or parse revents-bitfield for poll.
1753 mode1: revents-Flag bitfield returned from poll to parse OR
1754 ["in", "out", "err", "pri" (POSIX), "hup" (POSIX), "nval" (POSIX)]
1758 ...: More mode strings for generating the flag [-"-]
1768 <h3>Return value:</h3>
1769 table with boolean fields reflecting the mode parameter
1770 <strong>OR</strong> bitfield to use for the events-Flag field
1777 <li><a href="#nixio.poll">
1788 <dt><a name="nixio.sendfile"></a><strong>sendfile</strong> (socket, file, length)</dt>
1791 (POSIX) Send data from a file to a socket in kernel-space.
1798 socket: Socket Object
1806 length: Amount of data to send (in Bytes).
1816 <h3>Return value:</h3>
1826 <dt><a name="nixio.setenv"></a><strong>setenv</strong> (variable, value)</dt>
1829 Set or unset a environment variable.
1840 value: Value (optional)
1849 The environment variable will be unset if value is ommited.
1853 <h3>Return value:</h3>
1863 <dt><a name="nixio.setgid"></a><strong>setgid</strong> (gid)</dt>
1866 (POSIX) Set the group id of the current process.
1883 <h3>Return value:</h3>
1893 <dt><a name="nixio.setlogmask"></a><strong>setlogmask</strong> (priority)</dt>
1896 (POSIX) Set the logmask of the system logger for current process.
1903 priority: Priority ["emerg", "alert", "crit", "err", "warning",
1904 "notice", "info", "debug"]
1921 <dt><a name="nixio.setsid"></a><strong>setsid</strong> ()</dt>
1924 (POSIX) Create a new session and set the process group ID.
1932 <h3>Return value:</h3>
1942 <dt><a name="nixio.setuid"></a><strong>setuid</strong> (gid)</dt>
1945 (POSIX) Set the user id of the current process.
1962 <h3>Return value:</h3>
1972 <dt><a name="nixio.signal"></a><strong>signal</strong> (signal, handler)</dt>
1975 Ignore or use set the default handler for a signal.
1986 handler: ["ign", "dfl"]
1996 <h3>Return value:</h3>
2006 <dt><a name="nixio.socket"></a><strong>socket</strong> (domain, type)</dt>
2009 Create a new socket.
2016 domain: Domain ["inet", "inet6", "unix"]
2020 type: Type ["stream", "dgram", "raw"]
2030 <h3>Return value:</h3>
2040 <dt><a name="nixio.splice"></a><strong>splice</strong> (fdin, fdout, length, flags)</dt>
2043 (Linux) Send data from / to a pipe in kernel-space.
2050 fdin: Input I/O descriptor
2054 fdout: Output I/O descriptor
2058 length: Amount of data to send (in Bytes).
2062 flags: (optional, bitfield generated by splice_flags)
2072 <h3>Return value:</h3>
2080 <li><a href="#nixio.splice_flags">
2091 <dt><a name="nixio.splice_flags"></a><strong>splice_flags</strong> (flag1, ...)</dt>
2094 (Linux) Generate a flag bitfield for a call to splice.
2101 flag1: First Flag ["move", "nonblock", "more"]
2105 ...: More flags [-"-]
2115 <h3>Return value:</h3>
2123 <li><a href="#nixio.splice">
2134 <dt><a name="nixio.strerror"></a><strong>strerror</strong> (errno)</dt>
2137 Get the error message for the corresponding error code.
2144 errno: System error code
2154 <h3>Return value:</h3>
2164 <dt><a name="nixio.sysinfo"></a><strong>sysinfo</strong> ()</dt>
2167 (Linux) Get overall system statistics.
2175 <h3>Return value:</h3>
2176 Table containing: <ul>
2177 <li>uptime = system uptime in seconds</li>
2178 <li>loads = {loadavg1, loadavg5, loadavg15}</li>
2179 <li>totalram = total RAM</li>
2180 <li>freeram = free RAM</li>
2181 <li>sharedram = shared RAM</li>
2182 <li>bufferram = buffered RAM</li>
2183 <li>totalswap = total SWAP</li>
2184 <li>freeswap = free SWAP</li>
2185 <li>procs = number of running processes</li>
2195 <dt><a name="nixio.syslog"></a><strong>syslog</strong> (priority)</dt>
2198 (POSIX) Write a message to the system logger.
2205 priority: Priority ["emerg", "alert", "crit", "err", "warning",
2206 "notice", "info", "debug"]
2223 <dt><a name="nixio.times"></a><strong>times</strong> ()</dt>
2226 (POSIX) Get process times.
2234 <h3>Return value:</h3>
2235 Table containing: <ul>
2236 <li>utime = user time</li>
2237 <li>utime = system time</li>
2238 <li>cutime = children user time</li>
2239 <li>cstime = children system time</li>
2249 <dt><a name="nixio.tls"></a><strong>tls</strong> (mode)</dt>
2252 Create a new TLS context.
2259 mode: TLS-Mode ["client", "server"]
2269 <h3>Return value:</h3>
2279 <dt><a name="nixio.umask"></a><strong>umask</strong> (mask)</dt>
2282 Sets the file mode creation mask.
2289 mask: New creation mask (see chmod for format specifications)
2299 <h3>Return values:</h3>
2302 <li>the old umask as decimal mode number
2304 <li>the old umask as mode string
2315 <dt><a name="nixio.uname"></a><strong>uname</strong> ()</dt>
2318 (POSIX) Get information about current system and kernel.
2326 <h3>Return value:</h3>
2327 Table containing: <ul>
2328 <li>sysname = operating system</li>
2329 <li>nodename = network name (usually hostname)</li>
2330 <li>release = OS release</li>
2331 <li>version = OS version</li>
2332 <li>machine = hardware identifier</li>
2342 <dt><a name="nixio.waitpid"></a><strong>waitpid</strong> (pid, flag1, ...)</dt>
2345 (POSIX) Wait for a process to change state.
2352 pid: Process ID (optional, default: any childprocess)
2356 flag1: Flag (optional) ["nohang", "untraced", "continued"]
2360 ...: More Flags [-"-]
2369 If the "nohang" is given this function becomes non-blocking.
2373 <h3>Return values:</h3>
2376 <li>process id of child or 0 if no child has changed state
2378 <li>["exited", "signaled", "stopped"]
2380 <li>[exit code, terminate signal, stop signal]
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