setprotoent() — Open the protocol information data set

Standards

Standards / Extensions	C or C++	Dependencies
XPG4.2 Single UNIX Specification, Version 3	both

Format

X/Open:

#define _XOPEN_SOURCE_EXTENDED 1
#include <netdb.h>

void setprotoent(int stayopen);

Berkeley sockets:

#define _OE_SOCKETS
#include <netdb.h>

void setprotoent(int stayopen);

General description

The setprotoent() function opens and rewinds the /etc/protocol or the tcpip.ETC.PROTO data set. If the stayopen flag is nonzero, the /etc/protocol or the tcpip.ETC.PROTO data set remains open after each call.

Special behavior for C++

To use this function with C++, you must use the _XOPEN_SOURCE_EXTENDED 1 feature test macro.

Returned value

setprotoent() returns no values.

Related information

netdb.h
endprotoent() — Work with a protocol entry
getprotobyname() — Get a protocol entry by name
getprotobynumber() — Get a protocol entry by number
getprotoent() — Get the next protocol entry