dns_ip4 man page on Alpinelinux

dns_ip4 man page on Alpinelinux

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dns_ip4(3)							    dns_ip4(3)

NAME
       dns_ip4 - look up IPv4 addresses

SYNTAX
       #include <dns.h>

       int dns_ip4(stralloc* out,stralloc* fqdn);

DESCRIPTION
       dns_ip4	looks  up  4-byte  IP addresses for the fully-qualified domain
       name in fqdn. It puts the concatenation of the IP  addresses  into  out
       and  returns  0.	 If  the  domain  does	not exist in DNS, or has no IP
       addresses, out will be empty.

       If dns_ip4 has trouble with the DNS lookup or runs out  of  memory,  it
       returns -1, setting errno appropriately. It may or may not change out.

       If  fqdn	 is  a dotted-decimal IP address, dns_ip4 puts that IP address
       into out without checking DNS. More generally, if fqdn is  a  dot-sepa‐
       rated  sequence	of  dotted-decimal IP addresses, dns_ip4 puts those IP
       addresses into out without checking DNS. Brackets may appear inside the
       dotted-decimal IP addresses; they are ignored.

SEE ALSO
       dns_ip4_packet(3), dns_ip6(3), dns_name4(3)

								    dns_ip4(3)

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