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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: xcatch.c,v 1.8 1999/06/19 23:42:55 mdw Exp $ |
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4 | * |
5 | * Catch input and trap it in an X window |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the Edgeware X tools collection. |
13 | * |
14 | * X tools is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * X tools is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with X tools; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: xcatch.c,v $ |
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32 | * Revision 1.8 1999/06/19 23:42:55 mdw |
33 | * Improve signal handling. Fix options parsing to POSIX order only. |
34 | * |
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35 | * Revision 1.7 1999/05/21 22:09:19 mdw |
36 | * Take advantage of new dynamic string macros. |
37 | * |
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38 | * Revision 1.6 1999/05/19 20:41:15 mdw |
39 | * Track gratuitous change in mdwopt interface. |
40 | * |
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41 | * Revision 1.5 1999/05/05 18:55:18 mdw |
42 | * Block SIGCHLD around the `fork' call to prevent a race. |
43 | * |
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44 | * Revision 1.4 1999/03/24 22:23:57 mdw |
45 | * Improve display for large files. Keep newly added material in view if |
46 | * scrolled to bottom of window. |
47 | * |
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48 | * Revision 1.3 1998/12/20 17:19:16 mdw |
49 | * Return exit status of child process, rather than always returning |
50 | * success. |
51 | * |
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52 | * Revision 1.2 1998/12/16 00:10:58 mdw |
53 | * Fix tabbing in help text. |
54 | * |
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55 | * Revision 1.1 1998/12/15 23:46:50 mdw |
56 | * New program: captures input and puts it in a window. |
57 | * |
58 | */ |
59 | |
60 | /*----- Header files ------------------------------------------------------*/ |
61 | |
62 | #include <errno.h> |
63 | #include <signal.h> |
64 | #include <stdio.h> |
65 | #include <stdlib.h> |
66 | #include <string.h> |
67 | |
68 | #include <sys/types.h> |
69 | #include <sys/wait.h> |
70 | |
71 | #include <fcntl.h> |
72 | #include <unistd.h> |
73 | |
74 | #include <gtk/gtk.h> |
75 | |
76 | #include <mLib/dstr.h> |
77 | #include <mLib/mdwopt.h> |
78 | #include <mLib/report.h> |
79 | #include <mLib/quis.h> |
80 | |
81 | #include <mgLib/cancel.h> |
82 | #include <mgLib/msg.h> |
83 | |
84 | /*----- Inportant state ---------------------------------------------------*/ |
85 | |
86 | static unsigned int flags; |
87 | |
88 | enum { |
89 | f_closed = 1, |
90 | f_bogus = 2 |
91 | }; |
92 | |
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93 | static GtkWidget *textbox = 0; |
94 | static GdkFont *font; |
95 | |
96 | static pid_t kid = -1; |
97 | static int status; |
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98 | |
99 | /*----- Main code ---------------------------------------------------------*/ |
100 | |
101 | /* --- The window's closed --- */ |
102 | |
103 | static void killwin(GtkWidget *w, gpointer p) |
104 | { |
105 | if (flags & f_closed) |
106 | gtk_main_quit(); |
107 | else |
108 | textbox = 0; |
109 | } |
110 | |
111 | /* --- Some input has arrived --- */ |
112 | |
113 | static void ready(gpointer data, gint fd, GdkInputCondition c) |
114 | { |
115 | char buf[1024]; |
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116 | int doscroll = 1; |
117 | GtkText *t; |
118 | GtkAdjustment *va; |
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119 | |
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120 | /* --- If not ready to read then go away --- */ |
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121 | |
122 | if (!(c & GDK_INPUT_READ)) |
123 | return; |
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124 | |
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125 | /* --- Decide whether to scroll the window --- */ |
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126 | |
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127 | if (textbox) { |
128 | t = GTK_TEXT(textbox); |
129 | va = t->vadj; |
130 | if (va->value + va->page_size < va->upper) |
131 | doscroll = 0; |
132 | gtk_text_freeze(t); |
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133 | } |
134 | |
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135 | /* --- Read data into the buffer --- * |
136 | * |
137 | * This is a bit of a mess. |
138 | */ |
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139 | |
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140 | for (;;) { |
141 | int r = read(fd, buf, sizeof(buf)); |
142 | |
143 | /* --- The read failed --- * |
144 | * |
145 | * Maybe there's no more data to read. In this case, we get |
146 | * @EWOULDBLOCK@, indicating it's time to stop and do something else. |
147 | * Otherwise something serious has happened. |
148 | */ |
149 | |
150 | if (r < 0) { |
151 | if (errno == EWOULDBLOCK) |
152 | break; |
153 | msg(":~OK", "error reading data: %s", strerror(errno)); |
154 | exit(EXIT_FAILURE); |
155 | } |
156 | |
157 | /* --- End of file --- * |
158 | * |
159 | * If the box is closed, then exit quiety; otherwise wait for it to |
160 | * go away. |
161 | */ |
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162 | |
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163 | if (r == 0) { |
164 | close(fd); |
165 | if (textbox) |
166 | flags |= f_closed; |
167 | else |
168 | gtk_main_quit(); |
169 | break; |
170 | } |
171 | |
172 | /* --- If there's no output window, create one --- */ |
173 | |
174 | if (!textbox) { |
175 | GtkWidget *win; |
176 | GtkWidget *tbl; |
177 | GtkWidget *w; |
178 | |
179 | win = gtk_dialog_new(); |
180 | gtk_signal_connect(GTK_OBJECT(win), "destroy", |
181 | GTK_SIGNAL_FUNC(killwin), 0); |
182 | |
183 | tbl = gtk_table_new(2, 2, 0); |
184 | gtk_container_border_width(GTK_CONTAINER(tbl), 8); |
185 | gtk_box_pack_start(GTK_BOX(GTK_DIALOG(win)->vbox), tbl, 1, 1, 0); |
186 | gtk_widget_show(tbl); |
187 | |
188 | textbox = gtk_text_new(0, 0); |
189 | t = GTK_TEXT(textbox); |
190 | va = t->vadj; |
191 | gtk_table_attach(GTK_TABLE(tbl), textbox, 0, 1, 0, 1, |
192 | GTK_EXPAND | GTK_SHRINK | GTK_FILL, |
193 | GTK_EXPAND | GTK_SHRINK | GTK_FILL, |
194 | 0, 0); |
195 | gtk_text_set_editable(t, 0); |
196 | gtk_widget_set_usize(textbox, 500, 300); |
197 | gtk_text_freeze(t); |
198 | gtk_widget_show(textbox); |
199 | |
200 | w = gtk_vscrollbar_new(va); |
201 | gtk_table_attach(GTK_TABLE(tbl), w, 1, 2, 0, 1, |
202 | 0, GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0); |
203 | gtk_widget_show(w); |
204 | |
205 | w = gtk_hscrollbar_new(t->hadj); |
206 | gtk_table_attach(GTK_TABLE(tbl), w, 0, 1, 1, 2, |
207 | GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0, 0); |
208 | gtk_widget_show(w); |
209 | |
210 | gtk_box_set_homogeneous(GTK_BOX(GTK_DIALOG(win)->action_area), 0); |
211 | w = gtk_button_new_with_label("Dismiss"); |
212 | gtk_signal_connect_object(GTK_OBJECT(w), "clicked", |
213 | GTK_SIGNAL_FUNC(gtk_object_destroy), |
214 | GTK_OBJECT(win)); |
215 | gtk_box_pack_end(GTK_BOX(GTK_DIALOG(win)->action_area), w, 0, 0, 0); |
216 | GTK_WIDGET_SET_FLAGS(w, GTK_CAN_DEFAULT); |
217 | gtk_widget_grab_default(w); |
218 | cancel(GTK_WINDOW(win), w); |
219 | gtk_widget_show(w); |
220 | |
221 | gtk_widget_show(win); |
222 | } |
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223 | |
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224 | gtk_text_insert(t, font, 0, 0, buf, r); |
225 | } |
226 | |
227 | if (textbox) { |
228 | gtk_text_thaw(t); |
229 | if (doscroll) |
230 | gtk_adjustment_set_value(va, va->upper - va->page_size); |
231 | } |
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232 | } |
233 | |
234 | /* --- Signal handler --- */ |
235 | |
236 | static void reap(int sig) |
237 | { |
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238 | pid_t k; |
239 | int s; |
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240 | int e = errno; |
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241 | |
242 | for (;;) { |
243 | k = waitpid(-1, &s, WNOHANG); |
244 | if (k <= 0) |
245 | break; |
246 | if (k == kid) { |
247 | if (WIFEXITED(s)) |
248 | status = WEXITSTATUS(s); |
249 | else |
250 | status = 127; |
251 | } |
252 | } |
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253 | errno = e; |
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254 | } |
255 | |
256 | /* --- Main program --- */ |
257 | |
258 | static void version(FILE *fp) |
259 | { |
260 | fprintf(fp, "%s (xtoys version " VERSION ")\n", QUIS); |
261 | } |
262 | |
263 | static void usage(FILE *fp) |
264 | { |
265 | fprintf(fp, "Usage: %s [-f file] [-F font] [command [args...]]\n", QUIS); |
266 | } |
267 | |
268 | int main(int argc, char *argv[]) |
269 | { |
270 | int fd = -1; |
271 | |
272 | ego(argv[0]); |
273 | |
274 | gtk_init(&argc, &argv); |
275 | |
276 | for (;;) { |
277 | static struct option opt[] = { |
278 | { "help", 0, 0, 'h' }, |
279 | { "usage", 0, 0, 'u' }, |
280 | { "version", 0, 0, 'v' }, |
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281 | { "file", OPTF_ARGREQ, 0, 'f' }, |
282 | { "font", OPTF_ARGREQ, 0, 'F' }, |
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283 | { 0, 0, 0, 0 } |
284 | }; |
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285 | int i = mdwopt(argc, argv, "+huvf:F:", opt, 0, 0, 0); |
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286 | |
287 | if (i < 0) |
288 | break; |
289 | |
290 | switch (i) { |
291 | case 'h': |
292 | version(stdout); |
293 | fputc('\n', stdout); |
294 | usage(stdout); |
295 | fputs( |
296 | "\n" |
297 | "Catches input from a pipe or other source, and captures it in a window.\n" |
298 | "Nothing is displayed if there's no input.\n" |
299 | "\n" |
300 | "Options provided:\n" |
301 | "\n" |
302 | "-h, --help Display this help text\n" |
303 | "-u, --usage Display a quick usage summary\n" |
304 | "-v, --version Display the version number\n" |
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305 | "-f, --file=FILE\t Read input from the named file\n" |
306 | "-F, --font=FONT\t Display output in the named font\n", |
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307 | stdout); |
308 | exit(0); |
309 | break; |
310 | case 'u': |
311 | usage(stdout); |
312 | exit(0); |
313 | break; |
314 | case 'v': |
315 | version(stdout); |
316 | exit(0); |
317 | break; |
318 | case 'f': |
319 | if ((fd = open(optarg, O_RDONLY)) < 0) { |
320 | die(1, "couldn't open file: %s", strerror(errno)); |
321 | exit(1); |
322 | } |
323 | break; |
324 | case 'F': |
325 | font = gdk_font_load(optarg); |
326 | break; |
327 | default: |
328 | flags |= f_bogus; |
329 | break; |
330 | } |
331 | } |
332 | |
333 | if (flags & f_bogus) { |
334 | usage(stderr); |
335 | exit(1); |
336 | } |
337 | |
338 | if (fd == -1) { |
339 | if (optind == argc) |
340 | fd = STDIN_FILENO; |
341 | else { |
342 | int pfd[2]; |
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343 | struct sigaction sa; |
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344 | sigset_t newmask, oldmask; |
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345 | |
346 | /* --- Set up a signal handler --- */ |
347 | |
348 | sa.sa_handler = reap; |
349 | sigemptyset(&sa.sa_mask); |
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350 | sa.sa_flags = SA_NOCLDSTOP; |
351 | #ifdef SA_RESTART |
352 | sa.sa_flags |= SA_RESTART; |
353 | #endif |
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354 | sigaction(SIGCHLD, &sa, 0); |
355 | |
356 | /* --- Start a child program --- */ |
357 | |
358 | if (pipe(pfd)) |
359 | die(1, "couldn't open pipe: %s", strerror(errno)); |
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360 | |
361 | sigemptyset(&newmask); |
362 | sigaddset(&newmask, SIGCHLD); |
363 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
364 | |
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365 | kid = fork(); |
366 | if (kid < 0) |
367 | die(1, "couldn't fork: %s", strerror(errno)); |
368 | if (kid == 0) { |
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369 | dstr d = DSTR_INIT; |
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370 | |
371 | close(pfd[0]); |
372 | if (pfd[1] != STDOUT_FILENO) |
373 | dup2(pfd[1], STDOUT_FILENO); |
374 | if (pfd[1] != STDERR_FILENO) |
375 | dup2(pfd[1], STDERR_FILENO); |
376 | if (pfd[1] != STDOUT_FILENO && pfd[1] != STDERR_FILENO) |
377 | close(pfd[1]); |
378 | execvp(argv[optind], argv + optind); |
379 | |
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380 | dstr_putf(&d, "%s: couldn't run `%s': %s\n", |
381 | QUIS, argv[optind], strerror(errno)); |
382 | write(STDERR_FILENO, d.buf, d.len); |
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383 | dstr_destroy(&d); |
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384 | _exit(127); |
385 | } |
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386 | |
387 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
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388 | fd = pfd[0]; |
389 | close(pfd[1]); |
390 | } |
391 | } |
392 | |
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393 | { |
394 | int f = fcntl(fd, F_GETFL); |
395 | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
396 | } |
397 | |
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398 | gdk_input_add(fd, GDK_INPUT_READ, ready, 0); |
399 | gtk_main(); |
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400 | return (status); |
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401 | } |
402 | |
403 | /*----- That's all, folks -------------------------------------------------*/ |