tc.sched.c revision 316958 
1/* $Header: /p/tcsh/cvsroot/tcsh/tc.sched.c,v 3.25 2006/03/02 18:46:45 christos Exp $ */
2/*
3 * tc.sched.c: Scheduled command execution
4 *
5 * Karl Kleinpaste: Computer Consoles Inc. 1984
6 */
7/*-
8 * Copyright (c) 1980, 1991 The Regents of the University of California.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35#include "sh.h"
36
37RCSID("$tcsh: tc.sched.c,v 3.25 2006/03/02 18:46:45 christos Exp $")
38
39#include "ed.h"
40#include "tw.h"
41#include "tc.h"
42
43extern int just_signaled;
44
45struct sched_event {
46    struct sched_event *t_next;
47    time_t t_when;
48    Char  **t_lex;
49};
50static struct sched_event *sched_ptr = NULL;
51
52
53time_t
54sched_next(void)
55{
56    if (sched_ptr)
57	return (sched_ptr->t_when);
58    return ((time_t) - 1);
59}
60
61/*ARGSUSED*/
62void
63dosched(Char **v, struct command *c)
64{
65    struct sched_event *tp, **pp;
66    time_t  cur_time;
67    int     count, hours, minutes, dif_hour, dif_min;
68    Char   *cp;
69    int    relative;		/* time specified as +hh:mm */
70    struct tm *ltp;
71
72    USE(c);
73/* This is a major kludge because of a gcc linker  */
74/* Problem.  It may or may not be needed for you   */
75#if defined(_MINIX) && !defined(_MINIX_VMD)
76    char kludge[10];
77    extern char *sprintf();
78    sprintf(kludge, CGETS(24, 1, "kludge"));
79#endif /* _MINIX && !_MINIX_VMD */
80
81    v++;
82    cp = *v++;
83    if (cp == NULL) {
84	const Char *fmt;
85	if ((fmt = varval(STRsched)) == STRNULL)
86	    fmt = str2short("%h\t%T\t%R\n");
87	/* print list of scheduled events */
88	for (count = 1, tp = sched_ptr; tp; count++, tp = tp->t_next) {
89	    Char *buf, *str;
90
91	    buf = blkexpand(tp->t_lex);
92	    cleanup_push(buf, xfree);
93	    str = tprintf(FMT_SCHED, fmt, short2str(buf), tp->t_when, &count);
94	    cleanup_until(buf);
95	    cleanup_push(str, xfree);
96	    for (cp = str; *cp;)
97		xputwchar(*cp++);
98	    cleanup_until(str);
99	}
100	return;
101    }
102
103    if (*cp == '-') {
104	/* remove item from list */
105	if (!sched_ptr)
106	    stderror(ERR_NOSCHED);
107	if (*v)
108	    stderror(ERR_SCHEDUSAGE);
109	count = atoi(short2str(++cp));
110	if (count <= 0)
111	    stderror(ERR_SCHEDUSAGE);
112	pp = &sched_ptr;
113	tp = sched_ptr;
114	while (--count) {
115	    if (tp->t_next == 0)
116		break;
117	    else {
118		pp = &tp->t_next;
119		tp = tp->t_next;
120	    }
121	}
122	if (count)
123	    stderror(ERR_SCHEDEV);
124	*pp = tp->t_next;
125	blkfree(tp->t_lex);
126	xfree(tp);
127	return;
128    }
129
130    /* else, add an item to the list */
131    if (!*v)
132	stderror(ERR_SCHEDCOM);
133    relative = 0;
134    if (!Isdigit(*cp)) {	/* not abs. time */
135	if (*cp != '+')
136	    stderror(ERR_SCHEDUSAGE);
137	cp++, relative++;
138    }
139    minutes = 0;
140    hours = atoi(short2str(cp));
141    while (*cp && *cp != ':' && *cp != 'a' && *cp != 'p')
142	cp++;
143    if (*cp && *cp == ':')
144	minutes = atoi(short2str(++cp));
145    if ((hours < 0) || (minutes < 0) ||
146	(hours > 23) || (minutes > 59))
147	stderror(ERR_SCHEDTIME);
148    while (*cp && *cp != 'p' && *cp != 'a')
149	cp++;
150    if (*cp && relative)
151	stderror(ERR_SCHEDREL);
152    if (*cp == 'p')
153	hours += 12;
154    (void) time(&cur_time);
155    ltp = localtime(&cur_time);
156    if (relative) {
157	dif_hour = hours;
158	dif_min = minutes;
159    }
160    else {
161	if ((dif_hour = hours - ltp->tm_hour) < 0)
162	    dif_hour += 24;
163	if ((dif_min = minutes - ltp->tm_min) < 0) {
164	    dif_min += 60;
165	    if ((--dif_hour) < 0)
166		dif_hour = 23;
167	}
168    }
169    tp = xcalloc(1, sizeof *tp);
170#ifdef _SX
171    tp->t_when = cur_time - ltp->tm_sec + dif_hour * 3600 + dif_min * 60;
172#else	/* _SX */
173    tp->t_when = cur_time - ltp->tm_sec + dif_hour * 3600L + dif_min * 60L;
174#endif /* _SX */
175    /* use of tm_sec: get to beginning of minute. */
176    for (pp = &sched_ptr; *pp != NULL && tp->t_when >= (*pp)->t_when;
177	 pp = &(*pp)->t_next)
178	;
179    tp->t_next = *pp;
180    *pp = tp;
181    tp->t_lex = saveblk(v);
182}
183
184/*
185 * Execute scheduled events
186 */
187void
188sched_run(void)
189{
190    time_t   cur_time;
191    struct sched_event *tp;
192    struct wordent cmd, *nextword, *lastword;
193    struct command *t;
194    Char  **v, *cp;
195
196    pintr_disabled++;
197    cleanup_push(&pintr_disabled, disabled_cleanup);
198
199    (void) time(&cur_time);
200
201    /* bugfix by: Justin Bur at Universite de Montreal */
202    /*
203     * this test wouldn't be necessary if this routine were not called before
204     * each prompt (in sh.c).  But it is, to catch missed alarms.  Someone
205     * ought to fix it all up.  -jbb
206     */
207    if (!(sched_ptr && sched_ptr->t_when < cur_time)) {
208	cleanup_until(&pintr_disabled);
209	return;
210    }
211
212    if (GettingInput)
213	(void) Cookedmode();
214
215    while ((tp = sched_ptr) != NULL && tp->t_when < cur_time) {
216	if (seterr) {
217	    xfree(seterr);
218	    seterr = NULL;
219	}
220	cmd.word = STRNULL;
221	lastword = &cmd;
222	v = tp->t_lex;
223	for (cp = *v; cp; cp = *++v) {
224	    nextword = xcalloc(1, sizeof cmd);
225	    nextword->word = Strsave(cp);
226	    lastword->next = nextword;
227	    nextword->prev = lastword;
228	    lastword = nextword;
229	}
230	lastword->next = &cmd;
231	cmd.prev = lastword;
232	sched_ptr = tp->t_next;	/* looping termination cond: */
233	blkfree(tp->t_lex);	/* straighten out in case of */
234	xfree(tp);		/* command blow-up. */
235
236	cleanup_push(&cmd, lex_cleanup);
237	/* expand aliases like process() does. */
238	alias(&cmd);
239	/* build a syntax tree for the command. */
240	t = syntax(cmd.next, &cmd, 0);
241	cleanup_push(t, syntax_cleanup);
242	if (seterr)
243	    stderror(ERR_OLD);
244	/* execute the parse tree. */
245	execute(t, -1, NULL, NULL, TRUE);
246	/* done. free the lex list and parse tree. */
247	cleanup_until(&cmd);
248    }
249    if (GettingInput && !just_signaled) {	/* PWP */
250	(void) Rawmode();
251	ClearLines();		/* do a real refresh since something may */
252	ClearDisp();		/* have printed to the screen */
253	Refresh();
254    }
255    just_signaled = 0;
256
257    cleanup_until(&pintr_disabled);
258}
259