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->GETPROTOENT(3) System Library Functions Manual GETPROTOENT(3)
-
-NAME
- getprotoent, getprotobynumber, getprotobyname, setprotoent, endprotoent -
- get protocol entry
-
-SYNOPSIS
- #include <netdb.h>
-
- 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
- </PRE
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