ENDPROTOENT(3XNET)ENDPROTOENT(3XNET)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, open‐
ing 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 nec‐
essary.
The getprotobynumber() function searches the database from the begin‐
ning and finds the first entry for which the protocol number specified
by number matches the p_proto member, opening a connection to the data‐
base 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 subse‐
quent calls to any of these functions.
These functions are generally used with the Internet address family.
RETURN VALUES
On successful completion, getprotobyname(), getprotobynumber() and get‐
protoent() functions return a pointer to a protoent structure if the
requested entry was found, and a null pointer if the end of the data‐
base was reached or the requested entry was not found. Otherwise, a
null pointer is returned.
ERRORS
No errors are defined.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSOattributes(5), standards(5)
Jun 10, 2002 ENDPROTOENT(3XNET)