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32 .\" @(#)getprotoent.3 8.1 (Berkeley) 6/4/93
33 .\" $FreeBSD: src/lib/libc/net/getprotoent.3,v 1.4.2.4 2001/12/14 18:33:55 ru Exp $
34 .\" $DragonFly: src/lib/libc/net/getprotoent.3,v 1.2 2003/06/17 04:26:44 dillon Exp $
41 .Nm getprotobynumber ,
45 .Nd get protocol entry
53 .Fn getprotobyname "const char *name"
55 .Fn getprotobynumber "int proto"
57 .Fn setprotoent "int stayopen"
67 each return a pointer to an object with the
69 containing the broken-out
70 fields of a line in the network protocol data base,
72 .Bd -literal -offset indent
75 char *p_name; /* official name of protocol */
76 char **p_aliases; /* alias list */
77 int p_proto; /* protocol number */
81 The members of this structure are:
82 .Bl -tag -width p_aliases
84 The official name of the protocol.
86 A zero terminated list of alternate names for the protocol.
94 reads the next line of the file, opening the file if necessary.
99 opens and rewinds the file. If the
102 the net data base will not be closed after each call to
105 .Fn getprotobynumber .
117 sequentially search from the beginning
118 of the file until a matching
120 protocol number is found,
130 .Bl -tag -width /etc/protocols -compact
131 .It Pa /etc/protocols
138 .Fn getprotobynumber ,
143 functions appeared in
146 These functions use a static data space;
147 if the data is needed for future use, it should be
148 copied before any subsequent calls overwrite it.
150 protocols are currently understood.