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GETPROTOENT
Section: Linux Programmer's Manual (3)
Updated: 1993-04-24
Index
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NAME
getprotoent, getprotobyname, getprotobynumber, setprotoent,
endprotoent - get protocol entry
SYNOPSIS
#include <netdb.h>
struct protoent *getprotoent(void);
struct protoent *getprotobyname(const char *name);
struct protoent *getprotobynumber(int proto);
void setprotoent(int stayopen);
void endprotoent(void);
DESCRIPTION
The
getprotoent()
function reads the next line from the file
/etc/protocols and returns a structure protoent
containing the broken out fields from the line.
The /etc/protocols file is opened if necessary.
The
getprotobyname()
function returns a protoent
structure for the line from /etc/protocols that matches
the protocol name name.
The
getprotobynumber()
function returns a protoent
structure for the line that matches the protocol number number.
The
setprotoent()
function opens and rewinds the
/etc/protocols file.
If stayopen is true (1), then
the file will not be closed between calls to
getprotobyname()
or
getprotobynumber().
The
endprotoent()
function closes /etc/protocols.
The protoent structure is defined in <netdb.h> as follows:
struct protoent {
char *p_name; /* official protocol name */
char **p_aliases; /* alias list */
int p_proto; /* protocol number */
}
The members of the protoent structure are:
- p_name
-
The official name of the protocol.
- p_aliases
-
A zero terminated list of alternative names for the protocol.
- p_proto
-
The protocol number.
RETURN VALUE
The
getprotoent(),
getprotobyname()
and
getprotobynumber()
functions return the protoent structure, or a NULL pointer if an
error occurs or the end of the file is reached.
FILES
- /etc/protocols
-
protocol database file
CONFORMING TO
4.3BSD, POSIX.1-2001.
SEE ALSO
getnetent(3),
getservent(3),
protocols(5)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- FILES
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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