/***************************************************************************** * Copyright 1990, 1992 Free Software Foundation, Inc. * * This code was donated by Intel Corp. * * Intel hereby grants you permission to copy, modify, and * distribute this software and its documentation. Intel grants * this permission provided that the above copyright notice * appears in all copies and that both the copyright notice and * this permission notice appear in supporting documentation. In * addition, Intel grants this permission provided that you * prominently mark as not part of the original any modifications * made to this software or documentation, and that the name of * Intel Corporation not be used in advertising or publicity * pertaining to distribution of the software or the documentation * without specific, written prior permission. * * Intel Corporation does not warrant, guarantee or make any * representations regarding the use of, or the results of the use * of, the software and documentation in terms of correctness, * accuracy, reliability, currentness, or otherwise; and you rely * on the software, documentation and results solely at your own risk. *****************************************************************************/ static char rcsid[] = "$Id"; /****************************************************************************** * send_break: * * This function sends a a "break" to the specified tty. This is useful * if the tty is attached to an i960 board equipped with a break-detector * circuit that causes a hard reset of the board. ******************************************************************************/ #include <stdio.h> #include "ttycntl.h" #ifdef USG send_break( fd ) int fd; /* File descriptor of i960 tty */ { TTY_FLUSH(fd); ioctl( fd, TCSBRK, 0 ); } #else /* BSD Unix */ # include <signal.h> # include <sys/time.h> static void alarm_handler() { return; } send_break( fd ) int fd; /* File descriptor of i960 tty */ { struct itimerval t; void (*old_alarm)(); /* Alarm signal handler on entry */ old_alarm = signal( SIGALRM, alarm_handler ); /* Set timer for 1/4 second break */ t.it_value.tv_sec = 0; t.it_value.tv_usec = 250000; t.it_interval.tv_sec = t.it_interval.tv_usec = 0; /* Assert break for the duration of the timer */ ioctl( fd, TIOCSBRK, 0 ); setitimer( ITIMER_REAL, &t, 0 ); sigpause(0); ioctl( fd, TIOCCBRK, 0 ); signal( SIGALRM, old_alarm ); } #endif