setprotoent()

Updated: October 26, 2022

Open the protocol name database file

Synopsis:

#include <netdb.h>

void setprotoent( int stayopen );

Arguments:

stayopen
Nonzero if you don't want the database to be closed after each call to getprotobyname() or getprotobynumber().

Library:

libsocket

Use the -l socket option to qcc to link against this library.

Description:

The setprotoent() function opens and rewinds the protocol name database file. If the stayopen flag is nonzero, the protocol name database isn't closed after each call to getprotobyname() or getprotobynumber().

Files:

/etc/protocols
Protocol name database file.

Classification:

POSIX 1003.1

Safety:  
Cancellation point Yes
Interrupt handler No
Signal handler No
Thread No

Caveats:

This function uses static data; if you need the data for future use, you should copy it before any subsequent calls overwrite it.

Currently, only the Internet protocols are understood.