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\" @(#)getprotoent.3 8.1 (Berkeley) 6/4/93
\"
Dd July 15, 2011
Dt GETPROTOENT 3
Os
Sh NAME
Nm getprotoent ,
Nm getprotobynumber ,
Nm getprotobyname ,
Nm setprotoent ,
Nm endprotoent
Nd get protocol entry
Sh LIBRARY
Lb libc
Sh SYNOPSIS
In netdb.h
Ft struct protoent *
Fn getprotoent
Ft struct protoent *
Fn getprotobyname "const char *name"
Ft struct protoent *
Fn getprotobynumber "int proto"
Ft void
Fn setprotoent "int stayopen"
Ft void
Fn endprotoent "void"
Sh DESCRIPTION
The
Fn getprotoent ,
Fn getprotobyname ,
and
Fn getprotobynumber
functions
each return a pointer to an object with the
following structure
containing the broken-out
fields of a line in the network protocol data base,
Pa /etc/protocols .
Bd -literal -offset indent
Pp
struct protoent {
char *p_name; /* official name of protocol */
char **p_aliases; /* alias list */
int p_proto; /* protocol number */
};
Ed
Pp
The members of this structure are:
Bl -tag -width p_aliases -offset indent
It Fa p_name
The official name of the protocol.
It Fa p_aliases
A zero terminated list of alternative names for the protocol.
It Fa p_proto
The protocol number.
El
Pp
The
Fn getprotoent
function
reads the next line of the file, opening the file if necessary.
Pp
The
Fn setprotoent
function
opens and rewinds the file.
If the
Fa stayopen
flag is non-zero,
the net data base will not be closed after each call to
Fn getprotobyname
or
Fn getprotobynumber .
Pp
The
Fn endprotoent
function
closes the file.
Pp
The
Fn getprotobyname
function
and
Fn getprotobynumber
sequentially search from the beginning
of the file until a matching
protocol name or
protocol number is found,
or until
Dv EOF
is encountered.
Sh RETURN VALUES
Upon success,
Fn getprotoent ,
Fn getprotobyname ,
and
Fn getprotobynumber
return a pointer to the
Vt protoent
structure as described above.
A
Dv NULL
pointer is returned on
Dv EOF
or error.
Sh FILES
Bl -tag -width /etc/protocols -compact
It Pa /etc/protocols
El
Sh SEE ALSO
Xr protocols 5
Sh HISTORY
The
Fn getprotoent ,
Fn getprotobynumber ,
Fn getprotobyname ,
Fn setprotoent ,
and
Fn endprotoent
functions appeared in
Bx 4.2 .
Sh 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.
