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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified Sat Jul 24 19:26:03 1993 by Rik Faith (faith@cs.unc.edu)
-.TH getprotoent 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-getprotoent, getprotobyname, getprotobynumber, setprotoent,
-endprotoent \- get protocol entry
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <netdb.h>
-.PP
-.B struct protoent *getprotoent(void);
-.PP
-.BI "struct protoent *getprotobyname(const char *" name );
-.BI "struct protoent *getprotobynumber(int " proto );
-.PP
-.BI "void setprotoent(int " stayopen );
-.B void endprotoent(void);
-.fi
-.SH DESCRIPTION
-The
-.BR getprotoent ()
-function reads the next entry from the protocols database (see
-.BR protocols (5))
-and returns a
-.I protoent
-structure
-containing the broken-out fields from the entry.
-A connection is opened to the database if necessary.
-.PP
-The
-.BR getprotobyname ()
-function returns a
-.I protoent
-structure
-for the entry from the database
-that matches the protocol name
-.IR name .
-A connection is opened to the database if necessary.
-.PP
-The
-.BR getprotobynumber ()
-function returns a
-.I protoent
-structure
-for the entry from the database
-that matches the protocol number
-.IR number .
-A connection is opened to the database if necessary.
-.PP
-The
-.BR setprotoent ()
-function opens a connection to the database,
-and sets the next entry to the first entry.
-If
-.I stayopen
-is nonzero,
-then the connection to the database
-will not be closed between calls to one of the
-.BR getproto* ()
-functions.
-.PP
-The
-.BR endprotoent ()
-function closes the connection to the database.
-.PP
-The
-.I protoent
-structure is defined in
-.I <netdb.h>
-as follows:
-.PP
-.in +4n
-.EX
-struct protoent {
-    char  *p_name;       /* official protocol name */
-    char **p_aliases;    /* alias list */
-    int    p_proto;      /* protocol number */
-}
-.EE
-.in
-.PP
-The members of the
-.I protoent
-structure are:
-.TP
-.I p_name
-The official name of the protocol.
-.TP
-.I p_aliases
-A NULL-terminated list of alternative names for the protocol.
-.TP
-.I p_proto
-The protocol number.
-.SH RETURN VALUE
-The
-.BR getprotoent (),
-.BR getprotobyname (),
-and
-.BR getprotobynumber ()
-functions return a pointer to a
-statically allocated
-.I protoent
-structure, or a null pointer if an
-error occurs or the end of the file is reached.
-.SH FILES
-.PD 0
-.TP
-.I /etc/protocols
-protocol database file
-.PD
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lb lb lbx
-l l l.
-Interface	Attribute	Value
-T{
-.BR getprotoent ()
-T}	Thread safety	T{
-MT-Unsafe race:protoent
-race:protoentbuf locale
-T}
-T{
-.BR getprotobyname ()
-T}	Thread safety	T{
-MT-Unsafe race:protobyname
-locale
-T}
-T{
-.BR getprotobynumber ()
-T}	Thread safety	T{
-MT-Unsafe race:protobynumber
-locale
-T}
-T{
-.BR setprotoent (),
-.BR endprotoent ()
-T}	Thread safety	T{
-MT-Unsafe race:protoent
-locale
-T}
-.TE
-.hy
-.ad
-.sp 1
-In the above table,
-.I protoent
-in
-.I race:protoent
-signifies that if any of the functions
-.BR setprotoent (),
-.BR getprotoent (),
-or
-.BR endprotoent ()
-are used in parallel in different threads of a program,
-then data races could occur.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, 4.3BSD.
-.SH SEE ALSO
-.BR getnetent (3),
-.BR getprotoent_r (3),
-.BR getservent (3),
-.BR protocols (5)