ENDSERVENT(3XNET) X/Open Networking Services Library Functions
NAME
endservent, getservbyport, getservbyname, getservent, setservent -
network services database functions
SYNOPSIS
cc [
flag ... ]
file ...
-lxnet [
library ... ]
#include <netdb.h>
void endservent(void)
struct servent *getservbyname(
const char *name,
const char *proto);
struct servent *getservbyport(
int port,
const char *proto);
struct servent *getservent(void)
void setservent(
int stayopen);
DESCRIPTION
The
getservbyname(),
getservbyport() and
getservent() functions each
return a pointer to a
servent structure, the members of which contain
the fields of an entry in the network services database.
The
getservent() function reads the next entry of the database,
opening a connection to the database if necessary.
The
getservbyname() function searches the database from the beginning
and finds the first entry for which the service name specified by
name matches the
s_name member and the protocol name specified by
proto matches the
s_proto member, opening a connection to the
database if necessary. If
proto is a null pointer, any value of the
s_proto member will be matched.
The
getservbyport() function searches the database from the beginning
and finds the first entry for which the port specified by
port matches the
s_port member and the protocol name specified by
proto matches the
s_proto member, opening a connection to the database if
necessary. If
proto is a null pointer, any value of the
s_proto member will be matched. The
port argument must be in network byte
order.
The
setservent() function opens a connection to the database, and
sets the next entry to the first entry. If the
stayopen argument is
non-zero, the net database will not be closed after each call to the
getservent() function, either directly, or indirectly through one of
the other
getserv*() functions.
The
endservent() function closes the database.
USAGE
The
port argument of
getservbyport() need not be compatible with the
port values of all address families.
The
getservent(),
getservbyname() and
getservbyport() functions may
return pointers to static data, which may be overwritten by
subsequent calls to any of these functions.
These functions are generally used with the Internet address family.
RETURN VALUES
On successful completion,
getservbyname(),
getservbyport() and
getservent() return a pointer to a
servent structure if the requested
entry was found, and a null pointer if the end of the database was
reached or the requested entry was not found. Otherwise, a null
pointer is returned.
ERRORS
No errors are defined.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
SEE ALSO
endhostent(3XNET),
endprotoent(3XNET),
htonl(3XNET),
inet_addr(3XNET),
attributes(7),
standards(7) June 14, 2002 ENDSERVENT(3XNET)
