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