diff options
Diffstat (limited to 'usr.bin/vi/timer.c')
| -rw-r--r-- | usr.bin/vi/timer.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/usr.bin/vi/timer.c b/usr.bin/vi/timer.c new file mode 100644 index 000000000000..e2bcfb1c8852 --- /dev/null +++ b/usr.bin/vi/timer.c @@ -0,0 +1,166 @@ +/*- + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)timer.c 8.7 (Berkeley) 12/2/93"; +#endif /* not lint */ + +#include <sys/time.h> + +#include "vi.h" + +static void busy_handler __P((int)); + +/* + * XXX + * There are two uses of timers in nvi. The first is to push the recovery + * information out to disk at periodic intervals. The second is to display + * a "busy" message if an operation takes too long. Rather than solve this + * in a general fashion, we depend on the fact that only a single screen in + * a window is active at a time, and that there are only two parts of the + * systems that use timers. + * + * It would be nice to reimplement this with multiple timers, a la POSIX + * 1003.1, but not many systems offer them yet. + */ + +/* + * busy_on -- + * Display a message if too much time passes. + */ +void +busy_on(sp, seconds, msg) + SCR *sp; + int seconds; + char const *msg; +{ + struct itimerval value; + struct sigaction act; + + /* No busy messages in batch mode. */ + if (F_ISSET(sp, S_EXSILENT)) + return; + + /* Turn off the current timer, saving its current value. */ + value.it_interval.tv_sec = value.it_value.tv_sec = 0; + value.it_interval.tv_usec = value.it_value.tv_usec = 0; + if (setitimer(ITIMER_REAL, &value, &sp->time_value)) + return; + + /* + * Decrement the original timer by the number of seconds + * we're going to wait. + */ + if (sp->time_value.it_value.tv_sec > seconds) + sp->time_value.it_value.tv_sec -= seconds; + else + sp->time_value.it_value.tv_sec = 1; + + /* Reset the handler, saving its current value. */ + act.sa_handler = busy_handler; + sigemptyset(&act.sa_mask); + act.sa_flags = 0; + (void)sigaction(SIGALRM, &act, &sp->time_handler); + + /* Reset the timer. */ + value.it_value.tv_sec = seconds; + value.it_interval.tv_sec = 0; + value.it_interval.tv_usec = value.it_value.tv_usec = 0; + (void)setitimer(ITIMER_REAL, &value, NULL); + + sp->time_msg = msg; + F_SET(sp, S_TIMER_SET); +} + +/* + * busy_off -- + * Reset the timer handlers. + */ +void +busy_off(sp) + SCR *sp; +{ + struct itimerval ovalue, value; + + /* No busy messages in batch mode. */ + if (F_ISSET(sp, S_EXSILENT)) + return; + + /* If the timer flag isn't set, it must have fired. */ + if (!F_ISSET(sp, S_TIMER_SET)) + return; + + /* Ignore it if first on one of following system calls. */ + F_CLR(sp, S_TIMER_SET); + + /* Turn off the current timer. */ + value.it_interval.tv_sec = value.it_value.tv_sec = 0; + value.it_interval.tv_usec = value.it_value.tv_usec = 0; + if (setitimer(ITIMER_REAL, &value, &ovalue)) + return; + + /* If the timer wasn't running, we're done. */ + if (sp->time_handler.sa_handler == SIG_DFL) + return; + + /* + * Increment the old timer by the number of seconds + * remaining in the new one. + */ + sp->time_value.it_value.tv_sec += ovalue.it_value.tv_sec; + + /* Reset the handler to the original handler. */ + (void)sigaction(SIGALRM, &sp->time_handler, NULL); + + /* Reset the timer. */ + (void)setitimer(ITIMER_REAL, &sp->time_value, NULL); +} + +/* + * busy_handler -- + * Display a message when the timer goes off, and restore the + * timer to its original values. + */ +static void +busy_handler(signo) + int signo; +{ + SCR *sp; + + for (sp = __global_list->dq.cqh_first; + sp != (void *)&__global_list->dq; sp = sp->q.cqe_next) + if (F_ISSET(sp, S_TIMER_SET)) { + sp->s_busy(sp, sp->time_msg); + busy_off(sp); + } +} |