projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| ed06f32e KM |
1 | .\" Copyright (c) 1983 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| ec178508 | 5 | .\" @(#)getservent.3 6.3 (Berkeley) %G% |
| ed06f32e | 6 | .\" |
| 971d7dac | 7 | .TH GETSERVENT 3N "" |
| ed06f32e KM |
8 | .UC 5 |
| 9 | .SH NAME | |
| 10 | getservent, getservbyport, getservbyname, setservent, endservent \- get service entry | |
| 11 | .SH SYNOPSIS | |
| 12 | .nf | |
| 13 | .ft B | |
| 14 | #include <netdb.h> | |
| 15 | .PP | |
| 16 | .ft B | |
| 17 | struct servent *getservent() | |
| 18 | .PP | |
| 19 | .ft B | |
| 20 | struct servent *getservbyname(name, proto) | |
| 21 | char *name, *proto; | |
| 22 | .PP | |
| 23 | .ft B | |
| 24 | struct servent *getservbyport(port, proto) | |
| 25 | int port; char *proto; | |
| 26 | .PP | |
| 27 | .ft B | |
| 28 | setservent(stayopen) | |
| 29 | int stayopen | |
| 30 | .PP | |
| 31 | .ft B | |
| 32 | endservent() | |
| 33 | .fi | |
| 34 | .SH DESCRIPTION | |
| 35 | .IR Getservent , | |
| 36 | .IR getservbyname , | |
| 37 | and | |
| 38 | .I getservbyport | |
| 39 | each return a pointer to an object with the | |
| 40 | following structure | |
| 41 | containing the broken-out | |
| 42 | fields of a line in the network services data base, | |
| 43 | .IR /etc/services . | |
| 44 | .RS | |
| 45 | .PP | |
| 46 | .nf | |
| 47 | struct servent { | |
| 48 | char *s_name; /* official name of service */ | |
| 49 | char **s_aliases; /* alias list */ | |
| 50159ed7 | 50 | int s_port; /* port service resides at */ |
| ed06f32e KM |
51 | char *s_proto; /* protocol to use */ |
| 52 | }; | |
| 53 | .ft R | |
| 54 | .ad | |
| 55 | .fi | |
| 56 | .RE | |
| 57 | .PP | |
| 58 | The members of this structure are: | |
| 59 | .TP \w's_aliases'u+2n | |
| 60 | s_name | |
| 61 | The official name of the service. | |
| 62 | .TP \w's_aliases'u+2n | |
| 63 | s_aliases | |
| 64 | A zero terminated list of alternate names for the service. | |
| 65 | .TP \w's_aliases'u+2n | |
| 66 | s_port | |
| 67 | The port number at which the service resides. | |
| 68 | Port numbers are returned in network byte order. | |
| 69 | .TP \w's_aliases'u+2n | |
| 70 | s_proto | |
| 71 | The name of the protocol to use when contacting the | |
| 72 | service. | |
| 73 | .PP | |
| 74 | .I Getservent | |
| 75 | reads the next line of the file, opening the file if necessary. | |
| 76 | .PP | |
| 77 | .I Setservent | |
| 78 | opens and rewinds the file. If the | |
| 79 | .I stayopen | |
| 80 | flag is non-zero, | |
| 81 | the net data base will not be closed after each call to | |
| ec178508 JL |
82 | .I getservbyname |
| 83 | or .IR getservbyport . | |
| ed06f32e KM |
84 | .PP |
| 85 | .I Endservent | |
| 86 | closes the file. | |
| 87 | .PP | |
| 88 | .I Getservbyname | |
| 89 | and | |
| 90 | .I getservbyport | |
| 91 | sequentially search from the beginning | |
| 92 | of the file until a matching | |
| 93 | protocol name or | |
| 94 | port number is found, | |
| 95 | or until EOF is encountered. | |
| 96 | If a protocol name is also supplied (non-NULL), | |
| 97 | searches must also match the protocol. | |
| 98 | .SH FILES | |
| 99 | /etc/services | |
| 100 | .SH "SEE ALSO" | |
| 101 | getprotoent(3N), services(5) | |
| 102 | .SH DIAGNOSTICS | |
| 103 | Null pointer | |
| 104 | (0) returned on EOF or error. | |
| 105 | .SH BUGS | |
| 106 | All information | |
| 107 | is contained in a static area | |
| 108 | so it must be copied if it is | |
| 109 | to be saved. Expecting port | |
| 110 | numbers to fit in a 32 bit | |
| 111 | quantity is probably naive. |