AIX

bash-2.05a# ping www.google.it
PING www.l.google.com: (216.239.59.104): 56 data bytes
64 bytes from 216.239.59.104: icmp_seq=0 ttl=241 time=94 ms
64 bytes from 216.239.59.104: icmp_seq=1 ttl=241 time=45 ms
^C
----www.l.google.com PING Statistics----
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 45/69/94 ms

bash-2.05a# oslevel -r
5100-02

bash-2.05a# ping localhost
PING localhost: (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=0 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=255 time=0 ms
^C
----localhost PING Statistics----
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0/0/0 ms

bash-2.05a# hostname
xyz.abcd.com

bash-2.05a# ping xyz
PING xyz.abcd.com: (192.168.2.7): 56 data bytes
64 bytes from 192.168.2.7: icmp_seq=0 ttl=255 time=0 ms
64 bytes from 192.168.2.7: icmp_seq=1 ttl=255 time=0 ms
64 bytes from 192.168.2.7: icmp_seq=2 ttl=255 time=0 ms
^C
----xyz.abcd.com PING Statistics----
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0/0/0 ms

RETURN VALUE
A zero return value for getnameinfo() indicates successful completion; a non-zero return value indicates failure. The possible values for the failures are listed in the ERRORS section.

Upon successful completion, getnameinfo() shall return the node and service names, if requested, in the buffers provided. The returned names are always null-terminated strings.

ERRORS
The getnameinfo() function shall fail and return the corresponding value if:

[EAI_AGAIN] 
The name could not be resolved at this time. Future attempts may succeed. 
[EAI_BADFLAGS] 
The flags had an invalid value. 
[EAI_FAIL] 
A non-recoverable error occurred. 
[EAI_FAMILY] 
The address family was not recognized or the address length was invalid for the specified family. 
[EAI_MEMORY] 
There was a memory allocation failure. 
[EAI_NONAME] 
The name does not resolve for the supplied parameters. 
NI_NAMEREQD is set and the host's name cannot be located, or both nodename and servname were null.

[EAI_OVERFLOW] 
An argument buffer overflowed. The buffer pointed to by the node argument or the service argument was too small. 
[EAI_SYSTEM] 
A system error occurred. The error code can be found in errno.