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#ident "$Id: vhangup.c,v 1.1 1999/01/04 21:47:36 gert Exp $ Copyright (c) Gert Doering"
/* vhangup.c
*
* invalidate all file descriptors for a given tty device
*
* - works only on Linux and BSD Unix.
* - must be run as an external process, because mgetty does not have
* a controlling tty, and vhangup() can not operate on a file descriptor.
*
* $Log: vhangup.c,v $
* Revision 1.1 1999/01/04 21:47:36 gert
* add vhangup
*
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
int main( int argc, char ** argv )
{
int fd;
if ( argc != 2 || strncmp( argv[1], "/dev/", 5 ) != 0 )
{
fprintf( stderr, "usage: %s /dev/tty<x>\n", argv[0] );
exit(1);
}
if ( ( fd = open( argv[1], O_RDWR | O_NDELAY ) ) < 0 )
{
fprintf( stderr, "%s: can't open %s: %s\n",
argv[0], argv[1], strerror(errno) );
exit(2);
}
if ( vhangup() < 0 )
{
fprintf( stderr, "%s: vhangup() failed: %s\n",
argv[0], strerror(errno) );
exit(3);
}
close(fd);
return 0;
}
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