113 lines
2.3 KiB
Groff
113 lines
2.3 KiB
Groff
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.\" Copyright (c) 1983 Regents of the University of California.
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.\" All rights reserved. The Berkeley software License Agreement
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.\" specifies the terms and conditions for redistribution.
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.\"
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.\" @(#)getservent.3n 6.3 (Berkeley) 5/19/86
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.\"
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.TH GETSERVENT 3 "May 19, 1986"
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.UC 5
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.SH NAME
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getservent, getservbyport, getservbyname, setservent, endservent \- get service entry
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.SH SYNOPSIS
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.nf
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.ft B
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#include <netdb.h>
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.PP
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.ft B
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struct servent *getservent()
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.PP
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.ft B
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struct servent *getservbyname(name, proto)
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char *name, *proto;
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.PP
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.ft B
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struct servent *getservbyport(port, proto)
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int port; char *proto;
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.PP
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.ft B
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setservent(stayopen)
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int stayopen
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.PP
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.ft B
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endservent()
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.fi
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.SH DESCRIPTION
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.IR Getservent ,
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.IR getservbyname ,
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and
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.I getservbyport
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each return a pointer to an object with the
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following structure
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containing the broken-out
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fields of a line in the network services data base,
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.IR /etc/services .
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.RS
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.PP
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.nf
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struct servent {
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char *s_name; /* official name of service */
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char **s_aliases; /* alias list */
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int s_port; /* port service resides at */
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char *s_proto; /* protocol to use */
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};
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.ft R
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.ad
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.fi
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.RE
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.PP
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The members of this structure are:
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.TP \w's_aliases'u+2n
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s_name
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The official name of the service.
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.TP \w's_aliases'u+2n
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s_aliases
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A zero terminated list of alternate names for the service.
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.TP \w's_aliases'u+2n
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s_port
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The port number at which the service resides.
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Port numbers are returned in network byte order.
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.TP \w's_aliases'u+2n
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s_proto
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The name of the protocol to use when contacting the
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service.
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.PP
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.I Getservent
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reads the next line of the file, opening the file if necessary.
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.PP
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.I Setservent
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opens and rewinds the file. If the
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.I stayopen
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flag is non-zero,
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the net data base will not be closed after each call to
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.I getservbyname
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or
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.IR getservbyport .
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.PP
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.I Endservent
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closes the file.
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.PP
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.I Getservbyname
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and
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.I getservbyport
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sequentially search from the beginning
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of the file until a matching
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protocol name or
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port number is found,
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or until EOF is encountered.
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If a protocol name is also supplied (non-NULL),
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searches must also match the protocol.
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.SH FILES
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/etc/services
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.SH "SEE ALSO"
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getprotoent(3), services(5)
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.SH DIAGNOSTICS
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Null pointer
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(0) returned on EOF or error.
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.SH BUGS
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All information
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is contained in a static area
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so it must be copied if it is
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to be saved. Expecting port
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numbers to fit in a 32 bit
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quantity is probably naive.
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