| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: xcatch.c,v 1.8 1999/06/19 23:42:55 mdw Exp $ |
| 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 $ |
| 32 | * Revision 1.8 1999/06/19 23:42:55 mdw |
| 33 | * Improve signal handling. Fix options parsing to POSIX order only. |
| 34 | * |
| 35 | * Revision 1.7 1999/05/21 22:09:19 mdw |
| 36 | * Take advantage of new dynamic string macros. |
| 37 | * |
| 38 | * Revision 1.6 1999/05/19 20:41:15 mdw |
| 39 | * Track gratuitous change in mdwopt interface. |
| 40 | * |
| 41 | * Revision 1.5 1999/05/05 18:55:18 mdw |
| 42 | * Block SIGCHLD around the `fork' call to prevent a race. |
| 43 | * |
| 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 | * |
| 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 | * |
| 52 | * Revision 1.2 1998/12/16 00:10:58 mdw |
| 53 | * Fix tabbing in help text. |
| 54 | * |
| 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 | |
| 93 | static GtkWidget *textbox = 0; |
| 94 | static GdkFont *font; |
| 95 | |
| 96 | static pid_t kid = -1; |
| 97 | static int status; |
| 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]; |
| 116 | int doscroll = 1; |
| 117 | GtkText *t; |
| 118 | GtkAdjustment *va; |
| 119 | |
| 120 | /* --- If not ready to read then go away --- */ |
| 121 | |
| 122 | if (!(c & GDK_INPUT_READ)) |
| 123 | return; |
| 124 | |
| 125 | /* --- Decide whether to scroll the window --- */ |
| 126 | |
| 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); |
| 133 | } |
| 134 | |
| 135 | /* --- Read data into the buffer --- * |
| 136 | * |
| 137 | * This is a bit of a mess. |
| 138 | */ |
| 139 | |
| 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 | */ |
| 162 | |
| 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 | } |
| 223 | |
| 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 | } |
| 232 | } |
| 233 | |
| 234 | /* --- Signal handler --- */ |
| 235 | |
| 236 | static void reap(int sig) |
| 237 | { |
| 238 | pid_t k; |
| 239 | int s; |
| 240 | int e = errno; |
| 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 | } |
| 253 | errno = e; |
| 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' }, |
| 281 | { "file", OPTF_ARGREQ, 0, 'f' }, |
| 282 | { "font", OPTF_ARGREQ, 0, 'F' }, |
| 283 | { 0, 0, 0, 0 } |
| 284 | }; |
| 285 | int i = mdwopt(argc, argv, "+huvf:F:", opt, 0, 0, 0); |
| 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" |
| 305 | "-f, --file=FILE\t Read input from the named file\n" |
| 306 | "-F, --font=FONT\t Display output in the named font\n", |
| 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]; |
| 343 | struct sigaction sa; |
| 344 | sigset_t newmask, oldmask; |
| 345 | |
| 346 | /* --- Set up a signal handler --- */ |
| 347 | |
| 348 | sa.sa_handler = reap; |
| 349 | sigemptyset(&sa.sa_mask); |
| 350 | sa.sa_flags = SA_NOCLDSTOP; |
| 351 | #ifdef SA_RESTART |
| 352 | sa.sa_flags |= SA_RESTART; |
| 353 | #endif |
| 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)); |
| 360 | |
| 361 | sigemptyset(&newmask); |
| 362 | sigaddset(&newmask, SIGCHLD); |
| 363 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
| 364 | |
| 365 | kid = fork(); |
| 366 | if (kid < 0) |
| 367 | die(1, "couldn't fork: %s", strerror(errno)); |
| 368 | if (kid == 0) { |
| 369 | dstr d = DSTR_INIT; |
| 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 | |
| 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); |
| 383 | dstr_destroy(&d); |
| 384 | _exit(127); |
| 385 | } |
| 386 | |
| 387 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
| 388 | fd = pfd[0]; |
| 389 | close(pfd[1]); |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | { |
| 394 | int f = fcntl(fd, F_GETFL); |
| 395 | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
| 396 | } |
| 397 | |
| 398 | gdk_input_add(fd, GDK_INPUT_READ, ready, 0); |
| 399 | gtk_main(); |
| 400 | return (status); |
| 401 | } |
| 402 | |
| 403 | /*----- That's all, folks -------------------------------------------------*/ |