From d5c04534c1a04701493c28ff24d7040cc513515c Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Tue, 9 Nov 2010 16:11:07 +0100
Subject: Write documentation
---
lib/kernel/doc/src/inet.xml | 63 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
(limited to 'lib/kernel')
diff --git a/lib/kernel/doc/src/inet.xml b/lib/kernel/doc/src/inet.xml
index 2ae230152c..a22c0a8346 100644
--- a/lib/kernel/doc/src/inet.xml
+++ b/lib/kernel/doc/src/inet.xml
@@ -220,6 +220,69 @@ fe80::204:acff:fe17:bf38
<p>Returns the local hostname. Will never fail.</p>
</desc>
</func>
+
+ <func>
+ <name>getifaddrs() -> {ok,Iflist} | {error,posix}</name>
+ <fsummary>Return a list of interfaces and their addresses</fsummary>
+ <type>
+ <v>Iflist = {Ifname,[Ifopt]}</v>
+ <v>Ifname = string()</v>
+ <v>Ifopt = {flag,[Flag]} | {addr,Addr} | {netmask,Netmask}
+ | {broadaddr,Broadaddr} | {dstaddr,Dstaddr}
+ | {hwaddr,Hwaddr}</v>
+ <v>Flag = up | broadcast | loopback | pointtopoint
+ | running | multicast</v>
+ <v>Addr = Netmask = Broadadddr = Dstaddr = ip_address()</v>
+ <v>Hwaddr = [byte()]</v>
+ </type>
+ </func>
+ <desc>
+ <p>
+ Returns a list of 2-tuples containing interface names and the
+ interface's addresses. <c>Ifname</c> is a Unicode string.
+ <c>Hwaddr</c> is hardware dependent, e.g on Ethernet interfaces
+ it is the 6-byte Ethernet address (MAC address (EUI-48 address)).
+ </p>
+ <p>
+ The <c>{addr,Addr}</c>, <c>{netmask,_}</c> and <c>{broadaddr,_}</c>
+ tuples are repeated in the result list iff the interface has multiple
+ addresses. If you come across an interface that has
+ multiple <c>{flag,_}</c> or <c>{hwaddr,_}</c> tuples you have
+ a really strange interface or possibly a bug in this function.
+ The <c>{flag,_}</c> tuple is mandatory, all other optional.
+ </p>
+ <p>
+ Do not rely too much on the order of <c>Flag</c> atoms or
+ <c>Ifopt</c> tuples. There are some rules, though:
+ <list>
+ <item>
+ Immediately after <c>{addr,_}</c> follows <c>{netmask,_}</c>
+ </item>
+ <item>
+ Immediately thereafter follows <c>{broadaddr,_}</c> if
+ the <c>broadcast</c> flag is <em>not</em> set and the
+ <c>pointtopoint</c>flag <em>is</em> set.
+ </item>
+ <item>
+ Any <c>{netmask,_}</c>, <c>{broadaddr,_}</c> or
+ <c>{dstaddr,_}</c> tuples that follow an <c>{addr,_}</c>
+ tuple concerns that address.
+ </item>
+ </list>
+ </p>
+ <p>
+ The <c>{hwaddr,_}</c> tuple is not returned on Solaris since the
+ hardware address historically belongs to the link layer and only
+ the superuser can read such addresses.
+ </p>
+ <p>
+ On Windows, the data is fetched from quite different OS API
+ functions, so the <c>Netmask</c> and <c>Broadaddr</c>
+ values may be calculated, just as some <c>Flag</c> values.
+ You have been warned. Report flagrant bugs.
+ </p>
+ </desc>
+
<func>
<name>getopts(Socket, Options) -> {ok, OptionValues} | {error, posix()}</name>
<fsummary>Get one or more options for a socket</fsummary>
--
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