.TH dns_name4 3
.SH NAME
dns_name4 \- look up host name
.SH SYNTAX
.B #include <dns.h>

int \fBdns_name4\fP(stralloc* \fIout\fR,const char* \fIip\fR[4]);
.SH DESCRIPTION
dns_name4 looks up the domain name for the 4-byte IP address in \fIip\fR. It
puts the (first) domain name into \fIout\fR and returns 0. If the relevant
in-addr.arpa domain does not exist in DNS, or has no PTR records, \fIout\fR
will be empty.

If dns_name4 has trouble with the DNS lookup or runs out of memory, it returns
-1, setting errno appropriately. It may or may not change \fIout\fR.
.SH "SEE ALSO"
dns_name_packet(3), dns_name4_domain(3), dns_name6(3), dns_ip4(3)