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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 | .\" | |
3571ec9a | 5 | .\" @(#)getprotoent.3 6.1 (Berkeley) %G% |
d148e37f | 6 | .\" |
3571ec9a | 7 | .TH GETPROTOENT 3N "" |
d148e37f KM |
8 | .UC 5 |
9 | .SH NAME | |
10 | getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent \- get protocol entry | |
11 | .SH SYNOPSIS | |
12 | .nf | |
13 | .ft B | |
14 | .B #include <netdb.h> | |
15 | .PP | |
16 | .ft B | |
17 | struct protoent *getprotoent() | |
18 | .PP | |
19 | .ft B | |
20 | struct protoent *getprotobyname(name) | |
21 | char *name; | |
22 | .PP | |
23 | .ft B | |
24 | struct protoent *getprotobynumber(proto) | |
25 | int proto; | |
26 | .PP | |
27 | .ft B | |
28 | setprotoent(stayopen) | |
29 | int stayopen | |
30 | .PP | |
31 | .ft B | |
32 | endprotoent() | |
33 | .fi | |
34 | .SH DESCRIPTION | |
35 | .IR Getprotoent , | |
36 | .IR getprotobyname , | |
37 | and | |
38 | .I getprotobynumber | |
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 protocol data base, | |
43 | .IR /etc/protocols . | |
44 | .RS | |
45 | .PP | |
46 | .nf | |
47 | struct protoent { | |
48 | char *p_name; /* official name of protocol */ | |
49 | char **p_aliases; /* alias list */ | |
50 | long p_proto; /* protocol number */ | |
51 | }; | |
52 | .ft R | |
53 | .ad | |
54 | .fi | |
55 | .RE | |
56 | .PP | |
57 | The members of this structure are: | |
58 | .TP \w'p_aliases'u+2n | |
59 | p_name | |
60 | The official name of the protocol. | |
61 | .TP \w'p_aliases'u+2n | |
62 | p_aliases | |
63 | A zero terminated list of alternate names for the protocol. | |
64 | .TP \w'p_aliases'u+2n | |
65 | p_proto | |
66 | The protocol number. | |
67 | .PP | |
68 | .I Getprotoent | |
69 | reads the next line of the file, opening the file if necessary. | |
70 | .PP | |
71 | .I Setprotoent | |
72 | opens and rewinds the file. If the | |
73 | .I stayopen | |
74 | flag is non-zero, | |
75 | the net data base will not be closed after each call to | |
76 | .I getprotoent | |
77 | (either directly, or indirectly through one of | |
78 | the other \*(lqgetproto\*(rq calls). | |
79 | .PP | |
80 | .I Endprotoent | |
81 | closes the file. | |
82 | .PP | |
83 | .I Getprotobyname | |
84 | and | |
85 | .I getprotobynumber | |
86 | sequentially search from the beginning | |
87 | of the file until a matching | |
88 | protocol name or | |
89 | protocol number is found, | |
90 | or until EOF is encountered. | |
91 | .SH FILES | |
92 | /etc/protocols | |
93 | .SH "SEE ALSO" | |
94 | protocols(5) | |
95 | .SH DIAGNOSTICS | |
96 | Null pointer | |
97 | (0) returned on EOF or error. | |
98 | .SH BUGS | |
99 | All information | |
100 | is contained in a static area | |
101 | so it must be copied if it is | |
102 | to be saved. Only the Internet | |
103 | protocols are currently understood. |