ENDPROTOENT(3XNET) X/Open Networking Services Library Functions

NAME

endprotoent, getprotobynumber, getprotobyname, getprotoent, setprotoent -
network protocol database functions

SYNOPSIS

cc [ flag ... ] file ... -lxnet [ library ... ]
#include <netdb.h>

void endprotoent(void)


struct protoent *getprotobyname(const char *name);


struct protoent *getprotobynumber(int proto);


struct protoent *getprotoent(void)


void setprotoent(int stayopen);

DESCRIPTION

The getprotobyname(), getprotobynumber() and getprotoent(), functions
each return a pointer to a protoent structure, the members of which
contain the fields of an entry in the network protocol database.


The getprotoent() function reads the next entry of the database, opening
a connection to the database if necessary.


The getprotobyname() function searches the database from the beginning
and finds the first entry for which the protocol name specified by name
matches the p_name member, opening a connection to the database if
necessary.


The getprotobynumber() function searches the database from the beginning
and finds the first entry for which the protocol number specified by
number matches the p_proto member, opening a connection to the database
if necessary.


The setprotoent() function opens a connection to the database, and sets
the next entry to the first entry. If the stayopen argument is non-zero,
the connection to the network protocol database will not be closed after
each call to getprotoent() (either directly, or indirectly through one of
the other getproto*() functions).


The endprotoent() function closes the connection to the database.

USAGE

The getprotobyname(), getprotobynumber() and getprotoent() functions may
return pointers to static data, which may be overwritten by subsequent
calls to any of these functions.


These functions are generally used with the Internet address family.

RETURN VALUES

On successful completion, getprotobyname(), getprotobynumber() and
getprotoent() functions return a pointer to a protoent structure if the
requested entry was found, and a null pointer if the end of the database
was reached or the requested entry was not found. Otherwise, a null
pointer is returned.

ERRORS

No errors are defined.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO

attributes(7), standards(7)

June 10, 2002 ENDPROTOENT(3XNET)