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.TH ENDSERVENT 3XNET "Jun 14, 2002"
.SH NAME
endservent, getservbyport, getservbyname, getservent, setservent \- network
services database functions
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lxnet\fR [ \fIlibrary\fR ... ]
#include <netdb.h>

\fBvoid\fR \fBendservent\fR(void)
.fi

.LP
.nf
\fBstruct servent *\fR\fBgetservbyname\fR(\fBconst char *\fR\fIname\fR, \fBconst char *\fR\fIproto\fR);
.fi

.LP
.nf
\fBstruct servent *\fR\fBgetservbyport\fR(\fBint\fR \fIport\fR, \fBconst char *\fR\fIproto\fR);
.fi

.LP
.nf
\fBstruct servent *\fR\fBgetservent\fR(void)
.fi

.LP
.nf
\fBvoid\fR \fBsetservent\fR(\fBint\fR \fIstayopen\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBgetservbyname()\fR, \fBgetservbyport()\fR and \fBgetservent()\fR
functions each return a pointer to a \fBservent\fR structure, the members of
which contain the fields of an entry in the network services database.
.sp
.LP
The \fBgetservent()\fR function reads the next entry of the database, opening a
connection to the database if necessary.
.sp
.LP
The \fBgetservbyname()\fR function searches the database from the beginning and
finds the first entry for which the service name specified by \fIname\fR
matches the \fBs_name\fR member and the protocol name specified by \fIproto\fR
matches the \fBs_proto\fR member, opening a connection to the database if
necessary.  If \fIproto\fR is a null pointer, any value of the \fBs_proto\fR
member will be matched.
.sp
.LP
The \fBgetservbyport()\fR function searches the database from the beginning and
finds the first entry for which the port specified by \fIport\fR matches the
\fBs_port\fR member and the protocol name specified by \fIproto\fR matches the
\fBs_proto\fR member, opening a connection to the database if necessary.  If
\fIproto\fR is a null pointer, any value of the \fBs_proto\fR member will be
matched.  The \fIport\fR argument must be in network byte order.
.sp
.LP
The \fBsetservent()\fR function opens a connection to the database, and sets
the next entry to the first entry.  If the \fIstayopen\fR argument is non-zero,
the net database will not be closed after each call to the \fBgetservent()\fR
function, either directly, or indirectly through one of the other
\fBgetserv*()\fR functions.
.sp
.LP
The \fBendservent()\fR function closes the database.
.SH USAGE
.sp
.LP
The \fIport\fR argument of \fBgetservbyport()\fR need not be compatible with
the port values of all address families.
.sp
.LP
The \fBgetservent()\fR, \fBgetservbyname()\fR and \fBgetservbyport()\fR
functions may return pointers to static data, which may be overwritten by
subsequent calls to any of these functions.
.sp
.LP
These functions are generally used with the Internet address family.
.SH RETURN VALUES
.sp
.LP
On successful completion, \fBgetservbyname()\fR, \fBgetservbyport()\fR and
\fBgetservent()\fR return a pointer to a \fBservent\fR 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.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR endhostent (3XNET),
.BR endprotoent (3XNET),
.BR htonl (3XNET),
.BR inet_addr (3XNET),
.BR attributes (7),
.BR standards (7)