| 1 | .\" Copyright (c) 1983 Regents of the University of California.
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| 2 | .\" All rights reserved. The Berkeley software License Agreement
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| 3 | .\" specifies the terms and conditions for redistribution.
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| 4 | .\"
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| 5 | .\" @(#)getservent.3n 6.3 (Berkeley) 5/19/86
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| 6 | .\"
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| 7 | .TH GETSERVENT 3 "May 19, 1986"
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| 8 | .UC 5
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| 9 | .SH NAME
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| 10 | getservent, getservbyport, getservbyname, setservent, endservent \- get service entry
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| 11 | .SH SYNOPSIS
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| 12 | .nf
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| 13 | .ft B
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| 14 | #include <netdb.h>
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| 15 | .PP
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| 16 | .ft B
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| 17 | struct servent *getservent()
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| 18 | .PP
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| 19 | .ft B
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| 20 | struct servent *getservbyname(name, proto)
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| 21 | char *name, *proto;
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| 22 | .PP
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| 23 | .ft B
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| 24 | struct servent *getservbyport(port, proto)
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| 25 | int port; char *proto;
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| 26 | .PP
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| 27 | .ft B
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| 28 | setservent(stayopen)
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| 29 | int stayopen
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| 30 | .PP
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| 31 | .ft B
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| 32 | endservent()
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| 33 | .fi
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| 34 | .SH DESCRIPTION
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| 35 | .IR Getservent ,
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| 36 | .IR getservbyname ,
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| 37 | and
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| 38 | .I getservbyport
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| 39 | each return a pointer to an object with the
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| 40 | following structure
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| 41 | containing the broken-out
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| 42 | fields of a line in the network services data base,
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| 43 | .IR /etc/services .
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| 44 | .RS
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| 45 | .PP
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| 46 | .nf
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| 47 | struct servent {
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| 48 | char *s_name; /* official name of service */
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| 49 | char **s_aliases; /* alias list */
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| 50 | int s_port; /* port service resides at */
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| 51 | char *s_proto; /* protocol to use */
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| 52 | };
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| 53 | .ft R
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| 54 | .ad
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| 55 | .fi
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| 56 | .RE
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| 57 | .PP
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| 58 | The members of this structure are:
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| 59 | .TP \w's_aliases'u+2n
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| 60 | s_name
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| 61 | The official name of the service.
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| 62 | .TP \w's_aliases'u+2n
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| 63 | s_aliases
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| 64 | A zero terminated list of alternate names for the service.
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| 65 | .TP \w's_aliases'u+2n
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| 66 | s_port
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| 67 | The port number at which the service resides.
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| 68 | Port numbers are returned in network byte order.
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| 69 | .TP \w's_aliases'u+2n
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| 70 | s_proto
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| 71 | The name of the protocol to use when contacting the
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| 72 | service.
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| 73 | .PP
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| 74 | .I Getservent
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| 75 | reads the next line of the file, opening the file if necessary.
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| 76 | .PP
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| 77 | .I Setservent
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| 78 | opens and rewinds the file. If the
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| 79 | .I stayopen
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| 80 | flag is non-zero,
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| 81 | the net data base will not be closed after each call to
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| 82 | .I getservbyname
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| 83 | or
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| 84 | .IR getservbyport .
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| 85 | .PP
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| 86 | .I Endservent
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| 87 | closes the file.
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| 88 | .PP
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| 89 | .I Getservbyname
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| 90 | and
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| 91 | .I getservbyport
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| 92 | sequentially search from the beginning
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| 93 | of the file until a matching
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| 94 | protocol name or
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| 95 | port number is found,
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| 96 | or until EOF is encountered.
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| 97 | If a protocol name is also supplied (non-NULL),
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| 98 | searches must also match the protocol.
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| 99 | .SH FILES
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| 100 | /etc/services
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| 101 | .SH "SEE ALSO"
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| 102 | getprotoent(3), services(5)
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| 103 | .SH DIAGNOSTICS
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| 104 | Null pointer
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| 105 | (0) returned on EOF or error.
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| 106 | .SH BUGS
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| 107 | All information
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| 108 | is contained in a static area
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| 109 | so it must be copied if it is
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| 110 | to be saved. Expecting port
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| 111 | numbers to fit in a 32 bit
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| 112 | quantity is probably naive.
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