diff options
Diffstat (limited to 'lib/kernel/doc/src')
| -rw-r--r-- | lib/kernel/doc/src/inet.xml | 63 |
1 files changed, 63 insertions, 0 deletions
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> |