projects / unix-history / blame
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1 | .\" Copyright (c) 1983 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| ed06f32e | 3 | .\" |
| 91cff1e1 | 4 | .\" %sccs.include.redist.man% |
| ed06f32e | 5 | .\" |
| 91cff1e1 | 6 | .\" @(#)getservent.3 6.5 (Berkeley) %G% |
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7 | .\" |
| 8 | .TH GETSERVENT 3 "" | |
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9 | .UC 5 |
| 10 | .SH NAME | |
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11 | getservent, getservbyport, getservbyname, setservent, |
| 12 | endservent \- get service entry | |
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13 | .SH SYNOPSIS |
| 14 | .nf | |
| 15 | .ft B | |
| 16 | #include <netdb.h> | |
| 17 | .PP | |
| 18 | .ft B | |
| 19 | struct servent *getservent() | |
| 20 | .PP | |
| 21 | .ft B | |
| 22 | struct servent *getservbyname(name, proto) | |
| 23 | char *name, *proto; | |
| 24 | .PP | |
| 25 | .ft B | |
| 26 | struct servent *getservbyport(port, proto) | |
| 27 | int port; char *proto; | |
| 28 | .PP | |
| 29 | .ft B | |
| 30 | setservent(stayopen) | |
| 31 | int stayopen | |
| 32 | .PP | |
| 33 | .ft B | |
| 34 | endservent() | |
| 35 | .fi | |
| 36 | .SH DESCRIPTION | |
| 37 | .IR Getservent , | |
| 38 | .IR getservbyname , | |
| 39 | and | |
| 40 | .I getservbyport | |
| 41 | each return a pointer to an object with the | |
| 42 | following structure | |
| 43 | containing the broken-out | |
| 44 | fields of a line in the network services data base, | |
| 45 | .IR /etc/services . | |
| 46 | .RS | |
| 47 | .PP | |
| 48 | .nf | |
| 49 | struct servent { | |
| 50 | char *s_name; /* official name of service */ | |
| 51 | char **s_aliases; /* alias list */ | |
| 50159ed7 | 52 | int s_port; /* port service resides at */ |
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53 | char *s_proto; /* protocol to use */ |
| 54 | }; | |
| 55 | .ft R | |
| 56 | .ad | |
| 57 | .fi | |
| 58 | .RE | |
| 59 | .PP | |
| 60 | The members of this structure are: | |
| 61 | .TP \w's_aliases'u+2n | |
| 62 | s_name | |
| 63 | The official name of the service. | |
| 64 | .TP \w's_aliases'u+2n | |
| 65 | s_aliases | |
| 66 | A zero terminated list of alternate names for the service. | |
| 67 | .TP \w's_aliases'u+2n | |
| 68 | s_port | |
| 69 | The port number at which the service resides. | |
| 70 | Port numbers are returned in network byte order. | |
| 71 | .TP \w's_aliases'u+2n | |
| 72 | s_proto | |
| 73 | The name of the protocol to use when contacting the | |
| 74 | service. | |
| 75 | .PP | |
| 76 | .I Getservent | |
| 77 | reads the next line of the file, opening the file if necessary. | |
| 78 | .PP | |
| 79 | .I Setservent | |
| 80 | opens and rewinds the file. If the | |
| 81 | .I stayopen | |
| 82 | flag is non-zero, | |
| 83 | the net data base will not be closed after each call to | |
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84 | .I getservbyname |
| 85 | or .IR getservbyport . | |
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86 | .PP |
| 87 | .I Endservent | |
| 88 | closes the file. | |
| 89 | .PP | |
| 90 | .I Getservbyname | |
| 91 | and | |
| 92 | .I getservbyport | |
| 93 | sequentially search from the beginning | |
| 94 | of the file until a matching | |
| 95 | protocol name or | |
| 96 | port number is found, | |
| 97 | or until EOF is encountered. | |
| 98 | If a protocol name is also supplied (non-NULL), | |
| 99 | searches must also match the protocol. | |
| 100 | .SH FILES | |
| 101 | /etc/services | |
| 102 | .SH "SEE ALSO" | |
| 56e6bd55 | 103 | getprotoent(3), services(5) |
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104 | .SH DIAGNOSTICS |
| 105 | Null pointer | |
| 106 | (0) returned on EOF or error. | |
| 107 | .SH BUGS | |
| 108 | All information | |
| 109 | is contained in a static area | |
| 110 | so it must be copied if it is | |
| 111 | to be saved. Expecting port | |
| 112 | numbers to fit in a 32 bit | |
| 113 | quantity is probably naive. |