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)