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use of undeclared identifier 'gethostname'; did you mean 'gethostbyname2'?|

Platform: OS X 10.9.5
Server/main.cpp:43

i just wanted to test my client against your server but codeblocks tells me this... and now i´m sad.

-------------- Build: Debug in Server (compiler: GNU GCC Compiler)---------------

g++ -std=c++11 -Wall -g  -c /Users/tom/Documents/Dev/max/chat/Server/main.cpp -o obj/Debug/Server/main.o
/Users/tom/Documents/Dev/max/chat/Server/main.cpp:43:9: error: use of undeclared identifier 'gethostname'; did you mean 'gethostbyname2'?
    if (gethostname(hostname, sizeof(hostname)) == -1) {
        ^~~~~~~~~~~
        gethostbyname2
/usr/include/netdb.h:292:17: note: 'gethostbyname2' declared here
struct hostent  *gethostbyname2(const char *, int);
                 ^
/Users/tom/Documents/Dev/max/chat/Server/main.cpp:43:49: error: comparison between pointer and integer ('struct hostent *' and 'int')
    if (gethostname(hostname, sizeof(hostname)) == -1) {
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~
2 errors generated.
Process terminated with status 1 (0 minute(s), 1 second(s))
2 error(s), 0 warning(s) (0 minute(s), 1 second(s))

||=== Build: Debug in Server (compiler: GNU GCC Compiler) ===|
/Users/tom/Documents/Dev/max/chat/Server/main.cpp|43|error: use of undeclared identifier 'gethostname'; did you mean 'gethostbyname2'?|
/usr/include/netdb.h|292|note: 'gethostbyname2' declared here|
/Users/tom/Documents/Dev/max/chat/Server/main.cpp|43|error: comparison between pointer and integer ('struct hostent *' and 'int')|
||=== Build failed: 2 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

Make the server display its IP

Make the server display the IP under which it is reachable.

Interesting reads:

TODO Erste Rücksprache

1. Use getaddrinfo() (apparently you can pass it an hostname or a IP) (see here)
2. Investigate if struct has the same memory layout as a byte array (if not copy data to the byte array directly)
3. See if there is a function to test whether there is new input (unblocking)
4. Our message is 152 bytes long. Should be 150 though. Maybe this is related to 2.
5. Make the IP configurable at runtime.
6. Server should display its IP. #2