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>GETPROTOENT(3)          System Library Functions Manual         GETPROTOENT(3)
 
NAME
     getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent -
     get protocol entry
 
SYNOPSIS
     #include &lt;netdb.h&#62;
 
     struct protoent *
     getprotoent(void);
 
     struct protoent *
     getprotobyname(char *name);
 
     struct protoent *
     getprotobynumber(int proto);
 
     void
     setprotoent(int stayopen);
 
     void
     endprotoent(void);
 
DESCRIPTION
     The getprotoent(), getprotobyname(), and getprotobynumber() functions
     each return a pointer to an object with the following structure contain-
     ing the broken-out fields of a line in the network protocol database,
     /etc/protocols.
 
 
           struct  protoent {
                   char    *p_name;        /* official name of protocol */
                   char    **p_aliases;    /* alias list */
                   int     p_proto;        /* protocol number */
           };
 
     The members of this structure are:
 
     p_name     The official name of the protocol.
 
     p_aliases  A zero-terminated list of alternate names for the protocol.
 
     p_proto    The protocol number.
 
     The getprotoent() function reads the next line of the file, opening the
     file if necessary.
 
     The setprotoent() function opens and rewinds the file.  If the stayopen
     flag is non-zero, the net database will not be closed after each call to
     getprotobyname() or getprotobynumber().
 
     The endprotoent() function closes the file.
 
     The getprotobyname() and getprotobynumber() functions sequentially search
     from the beginning of the file until a matching protocol name or protocol
     number is found, or until EOF is encountered.
 
RETURN VALUES
     Null pointer (0) returned on EOF or error.
 
FILES
     /etc/protocols
 
SEE ALSO
     protocols(5)
 
HISTORY
     The getprotoent(), getprotobynumber(), getprotobyname(), setprotoent(),
     and endprotoent() functions appeared in 4.2BSD.
 
BUGS
     These functions use a static data space; if the data is needed for future
     use, it should be copied before any subsequent calls overwrite it.  Only
     the Internet protocols are currently understood.
 
BSD                              June 4, 1993                              BSD
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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
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85			`NAME="NET-COMMON-TCPIP-MANPAGES-GETPROTOENT">getprotoent</H1`
86			`><TABLE`
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92			`><PRE`
93			`CLASS="SCREEN"`
94			`>GETPROTOENT(3) System Library Functions Manual GETPROTOENT(3)`
95
96			`NAME`
97			`getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent -`
98			`get protocol entry`
99
100			`SYNOPSIS`
101			`#include <netdb.h>`
102
103			`struct protoent *`
104			`getprotoent(void);`
105
106			`struct protoent *`
107			`getprotobyname(char *name);`
108
109			`struct protoent *`
110			`getprotobynumber(int proto);`
111
112			`void`
113			`setprotoent(int stayopen);`
114
115			`void`
116			`endprotoent(void);`
117
118			`DESCRIPTION`
119			`The getprotoent(), getprotobyname(), and getprotobynumber() functions`
120			`each return a pointer to an object with the following structure contain-`
121			`ing the broken-out fields of a line in the network protocol database,`
122			`/etc/protocols.`
123
124
125			`struct protoent {`
126			`char p_name; / official name of protocol */`
127			`char *p_aliases; / alias list */`
128			`int p_proto; /* protocol number */`
129			`};`
130
131			`The members of this structure are:`
132
133			`p_name The official name of the protocol.`
134
135			`p_aliases A zero-terminated list of alternate names for the protocol.`
136
137			`p_proto The protocol number.`
138
139			`The getprotoent() function reads the next line of the file, opening the`
140			`file if necessary.`
141
142			`The setprotoent() function opens and rewinds the file. If the stayopen`
143			`flag is non-zero, the net database will not be closed after each call to`
144			`getprotobyname() or getprotobynumber().`
145
146			`The endprotoent() function closes the file.`
147
148			`The getprotobyname() and getprotobynumber() functions sequentially search`
149			`from the beginning of the file until a matching protocol name or protocol`
150			`number is found, or until EOF is encountered.`
151
152			`RETURN VALUES`
153			`Null pointer (0) returned on EOF or error.`
154
155			`FILES`
156			`/etc/protocols`
157
158			`SEE ALSO`
159			`protocols(5)`
160
161			`HISTORY`
162			`The getprotoent(), getprotobynumber(), getprotobyname(), setprotoent(),`
163			`and endprotoent() functions appeared in 4.2BSD.`
164
165			`BUGS`
166			`These functions use a static data space; if the data is needed for future`
167			`use, it should be copied before any subsequent calls overwrite it. Only`
168			`the Internet protocols are currently understood.`
169
170			`BSD June 4, 1993 BSD`
171			`</PRE`
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