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realhostname_sa(3) [freebsd man page]

REALHOSTNAME_SA(3)					   BSD Library Functions Manual 					REALHOSTNAME_SA(3)

realhostname_sa -- convert a struct sockaddr to the real host name LIBRARY
System Utilities Library (libutil, -lutil) SYNOPSIS
#include <sys/types.h> #include <netinet/in.h> #include <libutil.h> int realhostname_sa(char *host, size_t hsize, struct sockaddr *addr, int addrlen); DESCRIPTION
The function realhostname_sa() converts addr to the corresponding host name. This is done by resolving addr to a host name and then ensuring that the host name resolves back to addr. host must point to a buffer of at least hsize bytes, and will always be written to by this function. If the name resolution does not work both ways or if the host name is longer than hsize bytes, getnameinfo(3) with NI_NUMERICHOST specified, is used to convert addr to an ASCII form. If the string written to host is hsize bytes long, host will not be NUL terminated. RETURN VALUES
The realhostname_sa() function will return one of the following constants which are defined in <libutil.h>: HOSTNAME_FOUND A valid host name was found. HOSTNAME_INCORRECTNAME A host name was found, but it did not resolve back to the passed ip. host now contains the numeric value of ip. HOSTNAME_INVALIDADDR ip could not be resolved. host now contains the numeric value of ip. HOSTNAME_INVALIDNAME A host name was found, but it could not be resolved back to any ip number. host now contains the numeric value of ip. SEE ALSO
getaddrinfo(3), getnameinfo(3), realhostname(3) BSD
January 11, 2000 BSD

Check Out this Related Man Page

TRIMDOMAIN(3)						   BSD Library Functions Manual 					     TRIMDOMAIN(3)

trimdomain -- trim the current domain name from a host name LIBRARY
System Utilities Library (libutil, -lutil) SYNOPSIS
#include <sys/types.h> #include <libutil.h> void trimdomain(char *fullhost, int hostsize); DESCRIPTION
The function trimdomain() removes the current domain name from the passed fullhost name by writing a NUL character over the first period of the passed name. The current domain name is determined by calling gethostname(3) and removing everything up to the first period. The name is determined the first time this function is called and is cached for future use. The trimdomain() function will only trim the domain name if the passed fullname ends with the current domain name and if the length of the resulting host name does not exceed hostsize. If the passed fullname is actually a DISPLAY specification of the form host.domain:nn[.nn] and the domain name is the same as the local domain name, trimdomain() will remove the embedded domain name, copying the screen and display numbers to the end of the base host name and resulting in host:nn[.nn]. RETURN VALUES
The trimdomain() function does not return a value. SEE ALSO
gethostname(3) BSD
April 7, 1999 BSD
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