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1 | /* -*-c-*- |
2 | * |
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3 | * Pause for a while |
4 | * |
5 | * (c) 1999 Mark Wooding |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Pause. |
11 | * |
12 | * Pause is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later ersion. |
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16 | * |
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17 | * Pause is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU General Public License |
23 | * along with Pause; if not, write to the Free Software Foundation, |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
27 | /*----- Header files ------------------------------------------------------*/ |
28 | |
29 | #include <errno.h> |
30 | #include <math.h> |
31 | #include <signal.h> |
32 | #include <stdio.h> |
33 | #include <stdlib.h> |
34 | #include <string.h> |
35 | |
36 | #include <sys/types.h> |
37 | #include <sys/time.h> |
38 | #include <unistd.h> |
39 | #include <termios.h> |
40 | |
41 | #include <mLib/mdwopt.h> |
42 | #include <mLib/quis.h> |
43 | #include <mLib/report.h> |
44 | #include <mLib/tv.h> |
45 | |
46 | /*----- Static variables --------------------------------------------------*/ |
47 | |
48 | static struct termios ts_old, ts; |
49 | |
50 | /*----- Main code ---------------------------------------------------------*/ |
51 | |
52 | /* --- @sig@ --- * |
53 | * |
54 | * Arguments: @int s@ = signal number |
55 | * |
56 | * Returns: Doesn't. |
57 | * |
58 | * Use: Handles various fatal signals by resetting the terminal state |
59 | * and re-emitting the signal. |
60 | */ |
61 | |
62 | static void sig(int s) |
63 | { |
64 | tcsetattr(STDIN_FILENO, TCSAFLUSH, &ts_old); |
65 | signal(s, SIG_DFL); |
66 | raise(s); |
67 | } |
68 | |
69 | /* --- @suspend@ --- * |
70 | * |
71 | * Arguments: @int s@ = signal number |
72 | * |
73 | * Returns: --- |
74 | * |
75 | * Use: Handles a job control signal, as recommended in APUE. It |
76 | * resets the terminal state, resets the signal disposition, |
77 | * unblocks the signal and re-emits it (so that the shell |
78 | * shows the right message). When that call returns, the |
79 | * signal handler is reattached, and the terminal state is set |
80 | * again. |
81 | */ |
82 | |
83 | static void suspend(int s) |
84 | { |
85 | sigset_t ss; |
86 | |
87 | tcsetattr(STDIN_FILENO, TCSAFLUSH, &ts_old); |
88 | signal(s, SIG_DFL); |
89 | sigemptyset(&ss); |
90 | sigaddset(&ss, s); |
91 | sigprocmask(SIG_UNBLOCK, &ss, 0); |
92 | raise(s); |
93 | signal(s, suspend); |
94 | tcsetattr(STDIN_FILENO, TCSAFLUSH, &ts); |
95 | } |
96 | |
97 | /* --- Traditional GNUey help options --- */ |
98 | |
99 | static void usage(FILE *fp) |
100 | { |
101 | pquis(fp, "Usage: $ [time]\n"); |
102 | } |
103 | |
104 | static void version(FILE *fp) |
105 | { |
106 | pquis(fp, "$ version " VERSION "\n"); |
107 | } |
108 | |
109 | static void help(FILE *fp) |
110 | { |
111 | version(fp); |
112 | fputc('\n', fp); |
113 | usage(fp); |
114 | pquis(fp, "\n\ |
115 | Pauses until a key is pressed or an optional time-limit expires. The\n\ |
116 | time is given as a floating point number with an option suffix of `s',\n\ |
117 | `m', `h' or `d' (for `seconds', `minutes', `hours' or `days'\n\ |
118 | respectively).\n\ |
119 | \n\ |
120 | Options available:\n\ |
121 | \n\ |
122 | -h, --help Show this help message.\n\ |
123 | -v, --version Show program's version number.\n\ |
124 | -u, --usage Show terse usage summary.\n\ |
125 | "); |
126 | } |
127 | |
128 | /* --- @main@ --- * |
129 | * |
130 | * Arguments: @int argc@ = number of command line arguments |
131 | * @char *argv[]@ = vector of command line arguments |
132 | * |
133 | * Returns: Nonzero if it failed, zero if everything went well. |
134 | * |
135 | * Use: Souped-up version of `sleep'. |
136 | */ |
137 | |
138 | int main(int argc, char *argv[]) |
139 | { |
140 | struct termios ts; |
141 | unsigned f = 0; |
142 | struct timeval when; |
143 | |
144 | enum { |
145 | f_bogus = 1u, |
146 | f_timer = 2u, |
147 | f_key = 4u |
148 | }; |
149 | |
150 | /* --- Library initialization --- */ |
151 | |
152 | ego(argv[0]); |
153 | |
154 | /* --- Parse command line options --- */ |
155 | |
156 | for (;;) { |
157 | static struct option opt[] = { |
158 | { "help", 0, 0, 'h' }, |
159 | { "version", 0, 0, 'v' }, |
160 | { "usage", 0, 0, 'u' }, |
161 | { 0, 0, 0, 0 } |
162 | }; |
163 | int i = mdwopt(argc, argv, "hvu", opt, 0, 0, 0); |
164 | if (i < 0) |
165 | break; |
166 | switch (i) { |
167 | case 'h': |
168 | help(stderr); |
169 | exit(0); |
170 | case 'v': |
171 | version(stderr); |
172 | exit(0); |
173 | case 'u': |
174 | usage(stderr); |
175 | exit(0); |
176 | default: |
177 | f |= f_bogus; |
178 | break; |
179 | } |
180 | } |
181 | |
182 | /* --- Parse a timer spec --- */ |
183 | |
184 | if (!(f & f_bogus) && optind < argc) { |
185 | const char *p =argv[optind++]; |
186 | char *q; |
187 | double t = strtod(p, &q); |
188 | switch (*q) { |
189 | case 'd': t *= 24; |
190 | case 'h': t *= 60; |
191 | case 'm': t *= 60; |
192 | case 's': if (q[1] != 0) |
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193 | default: t = 0; |
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194 | case 0: break; |
195 | } |
196 | if (t <= 0) |
197 | die(1, "bad time specification `%s'", p); |
198 | gettimeofday(&when, 0); |
199 | TV_ADDL(&when, &when, t, (t - floor(t)) * MILLION); |
200 | f |= f_timer; |
201 | } |
202 | |
203 | /* --- Report a syntax error --- */ |
204 | |
205 | if (optind < argc) |
206 | f |= f_bogus; |
207 | if (f & f_bogus) { |
208 | usage(stderr); |
209 | exit(1); |
210 | } |
211 | |
212 | /* --- Set up terminal for single keypresses --- */ |
213 | |
214 | if (tcgetattr(STDIN_FILENO, &ts_old) == 0) { |
215 | static struct { int sig; void (*func)(int); } sigs[] = { |
216 | { SIGINT, sig }, |
217 | { SIGQUIT, sig }, |
218 | { SIGTERM, sig }, |
219 | { SIGTSTP, suspend }, |
220 | { 0, 0 } |
221 | }; |
222 | int i; |
223 | |
224 | /* --- Set up the new terminal attributes --- */ |
225 | |
226 | ts = ts_old; |
227 | ts.c_lflag &= ~(ECHO | ICANON | TOSTOP); |
228 | |
229 | /* --- Set up signal handlers to reset attributes --- */ |
230 | |
231 | for (i = 0; sigs[i].sig; i++) { |
232 | struct sigaction sa; |
233 | sigaction(sigs[i].sig, 0, &sa); |
234 | if (sa.sa_handler != SIG_IGN) |
235 | signal(sigs[i].sig, sigs[i].func); |
236 | } |
237 | signal(SIGTTIN, suspend); |
238 | |
239 | /* --- Commit the terminal attribute changes --- */ |
240 | |
241 | tcsetattr(STDIN_FILENO, TCSAFLUSH, &ts); |
242 | f |= f_key; |
243 | } |
244 | |
245 | /* --- Main loop --- */ |
246 | |
247 | for (;;) { |
248 | fd_set fd, *pfd; |
249 | int maxfd; |
250 | struct timeval tv, *ptv; |
251 | |
252 | /* --- Wait for a keypress --- */ |
253 | |
254 | if (f & f_key) { |
255 | FD_ZERO(&fd); |
256 | FD_SET(STDIN_FILENO, &fd); |
257 | maxfd = STDIN_FILENO + 1; |
258 | pfd = &fd; |
259 | } else { |
260 | maxfd = 0; |
261 | pfd = 0; |
262 | } |
263 | |
264 | /* --- Wait for the timer to expire --- */ |
265 | |
266 | if (f & f_timer) { |
267 | gettimeofday(&tv, 0); |
268 | TV_SUB(&tv, &when, &tv); |
269 | ptv = &tv; |
270 | } else |
271 | ptv = 0; |
272 | |
273 | /* --- See what interesting things have happened --- */ |
274 | |
275 | if (select(maxfd, pfd, 0, 0, ptv) < 0) { |
276 | if (errno == EINTR || errno == EAGAIN) |
277 | continue; |
278 | die(1, "error in select: %s", strerror(errno)); |
279 | } |
280 | |
281 | /* --- Check the timer --- */ |
282 | |
283 | if (f & f_timer) { |
284 | gettimeofday(&tv, 0); |
285 | if (TV_CMP(&tv, >=, &when)) |
286 | break; |
287 | } |
288 | |
289 | /* --- Check the key state --- */ |
290 | |
291 | if (f & f_key && FD_ISSET(STDIN_FILENO, &fd)) |
292 | break; |
293 | } |
294 | |
295 | /* --- See what gives --- */ |
296 | |
297 | if (f & f_key) |
298 | tcsetattr(STDIN_FILENO, TCSAFLUSH, &ts_old); |
299 | return (0); |
300 | } |
301 | |
302 | /*----- That's all, folks -------------------------------------------------*/ |