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33 .Nm getprotobynumber ,
37 .Nd get protocol entry
45 .Fn getprotobyname "const char *name"
47 .Fn getprotobynumber "int proto"
49 .Fn setprotoent "int stayopen"
59 each return a pointer to an object with the
61 containing the broken-out
62 fields of a line in the network protocol data base,
64 .Bd -literal -offset indent
66 char *p_name; /* official name of protocol */
67 char **p_aliases; /* alias list */
68 int p_proto; /* protocol number */
72 The members of this structure are:
73 .Bl -tag -width p_aliases
75 The official name of the protocol.
77 A zero terminated list of alternate names for the protocol.
85 reads the next line of the file, opening the file if necessary.
90 opens and rewinds the file.
94 the net data base will not be closed after each call to
97 .Fn getprotobynumber .
109 sequentially search from the beginning
110 of the file until a matching
112 protocol number is found,
117 Null pointer returned on
121 .Bl -tag -width /etc/protocols -compact
122 .It Pa /etc/protocols
129 .Fn getprotobynumber ,
134 functions appeared in
137 These functions use a thread-specific data space;
138 if the data is needed for future use, it should be
139 copied before any subsequent calls overwrite it.
141 protocols are currently understood.