source: owl.c @ cf02dd6

barnowl_perlaimdebianowlrelease-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since cf02dd6 was a68f05d, checked in by James M. Kretchmar <kretch@mit.edu>, 17 years ago
Command line arg -D turns on debugging and deletes previous debugging file
  • Property mode set to 100644
File size: 21.3 KB
Line 
1/*
2 * Copyright 2001 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that the above copyright notice and this
7 * permission notice appear in all copies and in supporting
8 * documentation.  No representation is made about the suitability of
9 * this software for any purpose.  It is provided "as is" without
10 * express or implied warranty.
11 */
12
13#include <stdio.h>
14#include <unistd.h>
15#include <stdlib.h>
16#include <string.h>
17#include <signal.h>
18#include <time.h>
19#include <sys/param.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include "owl.h"
23
24#if OWL_STDERR_REDIR
25#ifdef HAVE_SYS_IOCTL_H
26#include <sys/ioctl.h>
27#endif
28#ifdef HAVE_SYS_FILIO_H
29#include <sys/filio.h>
30#endif
31int stderr_replace(void);
32void stderr_redirect(int rfd);
33#endif
34
35static const char fileIdent[] = "$Id$";
36
37owl_global g;
38
39int main(int argc, char **argv, char **env)
40{
41  WINDOW *recwin, *sepwin, *typwin, *msgwin;
42  owl_editwin *tw;
43  owl_popwin *pw;
44  int j, ret, initialsubs, debug, argcsave, followlast;
45  int newmsgs, zpendcount, nexttimediff;
46  struct sigaction sigact;
47  char *configfile, *tty, *perlout, *perlerr, **argvsave, buff[LINE], startupmsg[LINE];
48  owl_filter *f;
49  owl_style *s;
50  time_t nexttime, now;
51  struct tm *today;
52  char *dir;
53#ifdef HAVE_LIBZEPHYR
54  ZNotice_t notice;
55#endif
56#if OWL_STDERR_REDIR
57  int newstderr;
58#endif
59
60  argcsave=argc;
61  argvsave=argv;
62  configfile=NULL;
63  tty=NULL;
64  debug=0;
65  initialsubs=1;
66  if (argc>0) {
67    argv++;
68    argc--;
69  }
70  while (argc>0) {
71    if (!strcmp(argv[0], "-n")) {
72      initialsubs=0;
73      argv++;
74      argc--;
75    } else if (!strcmp(argv[0], "-c")) {
76      if (argc<2) {
77        fprintf(stderr, "Too few arguments to -c\n");
78        usage();
79        exit(1);
80      }
81      configfile=argv[1];
82      argv+=2;
83      argc-=2;
84    } else if (!strcmp(argv[0], "-t")) {
85      if (argc<2) {
86        fprintf(stderr, "Too few arguments to -t\n");
87        usage();
88        exit(1);
89      }
90      tty=argv[1];
91      argv+=2;
92      argc-=2;
93    } else if (!strcmp(argv[0], "-d")) {
94      debug=1;
95      argv++;
96      argc--;
97    } else if (!strcmp(argv[0], "-D")) {
98      debug=1;
99      unlink(OWL_DEBUG_FILE);
100      argv++;
101      argc--;
102    } else if (!strcmp(argv[0], "-v")) {
103      printf("This is owl version %s\n", OWL_VERSION_STRING);
104      exit(0);
105    } else {
106      fprintf(stderr, "Uknown argument\n");
107      usage();       
108      exit(1);
109    }
110  }
111
112#ifdef HAVE_LIBZEPHYR
113  /* zephyr init */
114  ret=owl_zephyr_initialize();
115  if (ret) {
116    exit(1);
117  }
118#endif
119 
120  /* signal handler */
121  /*sigact.sa_handler=sig_handler;*/
122  sigact.sa_sigaction=sig_handler;
123  sigemptyset(&sigact.sa_mask);
124  sigact.sa_flags=SA_SIGINFO;
125  sigaction(SIGWINCH, &sigact, NULL);
126  sigaction(SIGALRM, &sigact, NULL);
127  sigaction(SIGPIPE, &sigact, NULL);
128
129  /* screen init */
130  if (!getenv("TERMINFO")) {
131    sprintf(buff, "TERMINFO=%s", TERMINFO);
132    putenv(buff);
133    owl_function_debugmsg("startup: setting TERMINFO to %s", TERMINFO);
134  } else {
135    owl_function_debugmsg("startup: leaving TERMINFO as %s from envrionment", getenv("TERMINFO"));
136  }
137  initscr();
138  start_color();
139#ifdef HAVE_USE_DEFAULT_COLORS
140  use_default_colors();
141#endif
142  raw();
143  noecho();
144
145  /* define simple color pairs */
146  if (has_colors() && COLOR_PAIRS>=8) {
147    init_pair(OWL_COLOR_BLACK,   COLOR_BLACK,   -1);
148    init_pair(OWL_COLOR_RED,     COLOR_RED,     -1);
149    init_pair(OWL_COLOR_GREEN,   COLOR_GREEN,   -1);
150    init_pair(OWL_COLOR_YELLOW,  COLOR_YELLOW,  -1);
151    init_pair(OWL_COLOR_BLUE,    COLOR_BLUE,    -1);
152    init_pair(OWL_COLOR_MAGENTA, COLOR_MAGENTA, -1);
153    init_pair(OWL_COLOR_CYAN,    COLOR_CYAN,    -1);
154    init_pair(OWL_COLOR_WHITE,   COLOR_WHITE,   -1);
155  }
156
157  /* owl global init */
158  owl_global_init(&g);
159  if (debug) owl_global_set_debug_on(&g);
160  owl_function_debugmsg("startup: first available debugging message");
161  owl_global_set_startupargs(&g, argcsave, argvsave);
162#ifdef HAVE_LIBZEPHYR
163  owl_global_set_havezephyr(&g);
164#endif
165  owl_global_set_haveaim(&g);
166
167#if OWL_STDERR_REDIR
168  /* Do this only after we've started curses up... */
169  owl_function_debugmsg("startup: doing stderr redirection");
170  newstderr = stderr_replace();
171#endif   
172
173  /* create the owl directory, in case it does not exist */
174  owl_function_debugmsg("startup: creating owl directory, if not present");
175  dir=owl_sprintf("%s/%s", owl_global_get_homedir(&g), OWL_CONFIG_DIR);
176  mkdir(dir, S_IRWXU);
177  owl_free(dir);
178
179  /* set the tty, either from the command line, or by figuring it out */
180  owl_function_debugmsg("startup: setting tty name");
181  if (tty) {
182    owl_global_set_tty(&g, tty);
183  } else {
184    owl_global_set_tty(&g, owl_util_get_default_tty());
185  }
186
187  /* setup the built-in styles */
188  owl_function_debugmsg("startup: creating built-in styles");
189  s=owl_malloc(sizeof(owl_style));
190  owl_style_create_internal(s, "default", &owl_stylefunc_default,
191                            "Default message formatting");
192  owl_global_add_style(&g, s);
193
194  s=owl_malloc(sizeof(owl_style));
195  owl_style_create_internal(s, "basic", &owl_stylefunc_basic,
196                            "Basic message formatting.");
197  owl_global_add_style(&g, s);
198#if 0
199  s=owl_malloc(sizeof(owl_style));
200  owl_style_create_internal(s, "vt", &owl_stylefunc_vt,
201                            "VT message formatting.");
202  owl_global_add_style(&g, s);
203#endif
204  s=owl_malloc(sizeof(owl_style));
205  owl_style_create_internal(s, "oneline", &owl_stylefunc_oneline,
206                            "Formats for one-line-per-message");
207  owl_global_add_style(&g, s);
208
209  /* setup the default filters */
210  /* the personal filter will need to change again when AIM chat's are
211   *  included.  Also, there should be an %aimme% */
212  owl_function_debugmsg("startup: creating default filters");
213  f=owl_malloc(sizeof(owl_filter));
214  owl_filter_init_fromstring(f, "personal", "( type ^zephyr$ "
215                             "and class ^message$ and instance ^personal$ "
216                             "and ( recipient ^%me%$ or sender ^%me%$ ) ) "
217                             "or ( type ^aim$ and login ^none$ )");
218  owl_list_append_element(owl_global_get_filterlist(&g), f);
219
220  f=owl_malloc(sizeof(owl_filter));
221  owl_filter_init_fromstring(f, "trash", "class ^mail$ or opcode ^ping$ or type ^admin$ or ( not login ^none$ )");
222  owl_list_append_element(owl_global_get_filterlist(&g), f);
223
224  f=owl_malloc(sizeof(owl_filter));
225  owl_filter_init_fromstring(f, "ping", "opcode ^ping$");
226  owl_list_append_element(owl_global_get_filterlist(&g), f);
227
228  f=owl_malloc(sizeof(owl_filter));
229  owl_filter_init_fromstring(f, "auto", "opcode ^auto$");
230  owl_list_append_element(owl_global_get_filterlist(&g), f);
231
232  f=owl_malloc(sizeof(owl_filter));
233  owl_filter_init_fromstring(f, "login", "not login ^none$");
234  owl_list_append_element(owl_global_get_filterlist(&g), f);
235
236  f=owl_malloc(sizeof(owl_filter));
237  owl_filter_init_fromstring(f, "reply-lockout", "class ^noc or class ^mail$");
238  owl_list_append_element(owl_global_get_filterlist(&g), f);
239
240  f=owl_malloc(sizeof(owl_filter));
241  owl_filter_init_fromstring(f, "out", "direction ^out$");
242  owl_list_append_element(owl_global_get_filterlist(&g), f);
243
244  f=owl_malloc(sizeof(owl_filter));
245  owl_filter_init_fromstring(f, "aim", "type ^aim$");
246  owl_list_append_element(owl_global_get_filterlist(&g), f);
247
248  f=owl_malloc(sizeof(owl_filter));
249  owl_filter_init_fromstring(f, "zephyr", "type ^zephyr$");
250  owl_list_append_element(owl_global_get_filterlist(&g), f);
251
252  f=owl_malloc(sizeof(owl_filter));
253  owl_filter_init_fromstring(f, "none", "false");
254  owl_list_append_element(owl_global_get_filterlist(&g), f);
255
256  f=owl_malloc(sizeof(owl_filter));
257  owl_filter_init_fromstring(f, "all", "true");
258  owl_list_append_element(owl_global_get_filterlist(&g), f);
259
260  /* set the current view */
261  owl_function_debugmsg("startup: setting the current view");
262  owl_view_create(owl_global_get_current_view(&g), "main", f, owl_global_get_style_by_name(&g, "default"));
263
264  /* AIM init */
265  owl_function_debugmsg("startup: doing AIM initialization");
266  owl_aim_init();
267
268  /* process the startup file */
269  owl_function_debugmsg("startup: processing startup file");
270  owl_function_source(NULL);
271
272  /* read the config file */
273  owl_function_debugmsg("startup: processing config file");
274  owl_context_set_readconfig(owl_global_get_context(&g));
275  perlerr=owl_perlconfig_readconfig(configfile);
276  if (perlerr) {
277    endwin();
278    fprintf(stderr, "\nError parsing configfile: %s\n", perlerr);
279    exit(1);
280  }
281
282  /* if the config defines a formatting function, add 'perl' as a style */
283  if (owl_global_is_config_format(&g)) {
284    owl_function_debugmsg("Found perl formatting");
285    s=owl_malloc(sizeof(owl_style));
286    owl_style_create_perl(s, "perl", "owl::_format_msg_legacy_wrap",
287                          "User-defined perl style that calls owl::format_msg"
288                          "with legacy global variable support");
289    owl_global_add_style(&g, s);
290    owl_global_set_default_style(&g, "perl");
291  }
292
293  /* execute the startup function in the configfile */
294  owl_function_debugmsg("startup: executing perl startup, if applicable");
295  perlout = owl_perlconfig_execute("owl::startup();");
296  if (perlout) owl_free(perlout);
297 
298  /* hold on to the window names for convenience */
299  msgwin=owl_global_get_curs_msgwin(&g);
300  recwin=owl_global_get_curs_recwin(&g);
301  sepwin=owl_global_get_curs_sepwin(&g);
302  typwin=owl_global_get_curs_typwin(&g);
303  tw=owl_global_get_typwin(&g);
304
305  /* welcome message */
306  owl_function_debugmsg("startup: creating splash message");
307  strcpy(startupmsg, "-----------------------------------------------------------------------\n");
308  sprintf(buff,      "Welcome to Owl version %s.  Press 'h' for on-line help. \n", OWL_VERSION_STRING);
309  strcat(startupmsg, buff);
310  strcat(startupmsg, "                                                                       \n");
311  strcat(startupmsg, "If you would like to receive release announcements about Owl you can   \n");
312  strcat(startupmsg, "join the owl-users@mit.edu mailing list at http://web.mit.edu/ktools/  \n");
313  strcat(startupmsg, "                                                                 ^ ^   \n");
314  strcat(startupmsg, "                                                                 OvO   \n");
315  strcat(startupmsg, "Please report any bugs or suggestions to bug-owl@mit.edu        (   )  \n");
316  strcat(startupmsg, "-----------------------------------------------------------------m-m---\n");
317  owl_function_adminmsg("", startupmsg);
318  sepbar(NULL);
319
320  wrefresh(sepwin);
321
322  /* load zephyr subs */
323  if (initialsubs) {
324    owl_function_debugmsg("startup: loading initial zephyr subs");
325    /* load normal subscriptions */
326    ret=owl_zephyr_loadsubs(NULL);
327    if (ret==-1) {
328      owl_function_adminmsg("", "Error loading zephyr subscriptions, file inaccessable");
329    } else if (ret!=0) {
330      owl_function_adminmsg("", "Error loading zephyr subscriptions");
331    }
332   
333    if (ret!=-1) {
334      owl_global_add_userclue(&g, OWL_USERCLUE_CLASSES);
335    }
336
337    /* load login subscriptions */
338    if (owl_global_is_loginsubs(&g)) {
339      owl_function_debugmsg("startup: loading login subs");
340      owl_function_loadloginsubs(NULL);
341    }
342  }
343
344  /* set the startup and default style, based on userclue and presence of a
345   * formatting function */
346  owl_function_debugmsg("startup: setting startup and default style");
347  if (0 != strcmp(owl_global_get_default_style(&g), "__unspecified__")) {
348    /* the style was set by the user: leave it alone */
349  } else if (owl_global_is_config_format(&g)) {
350    owl_global_set_default_style(&g, "perl");
351  } else if (owl_global_is_userclue(&g, OWL_USERCLUE_CLASSES)) {
352    owl_global_set_default_style(&g, "default");
353  } else {
354    owl_global_set_default_style(&g, "basic");
355  }
356
357  /* zlog in if we need to */
358  if (owl_global_is_startuplogin(&g)) {
359    owl_function_debugmsg("startup: doing zlog in");
360    owl_zephyr_zlog_in();
361  }
362
363  owl_function_debugmsg("startup: set style for the view");
364  owl_view_set_style(owl_global_get_current_view(&g), 
365                     owl_global_get_style_by_name(&g, owl_global_get_default_style(&g)));   
366
367  owl_function_debugmsg("startup: setting context interactive");
368  owl_context_set_interactive(owl_global_get_context(&g));
369
370  nexttimediff=10;
371  nexttime=time(NULL);
372
373  owl_function_debugmsg("startup: entering main loop");
374  /* main loop */
375  while (1) {
376
377    /* if a resize has been scheduled, deal with it */
378    owl_global_resize(&g, 0, 0);
379
380    /* these are here in case a resize changes the windows */
381    msgwin=owl_global_get_curs_msgwin(&g);
382    recwin=owl_global_get_curs_recwin(&g);
383    sepwin=owl_global_get_curs_sepwin(&g);
384    typwin=owl_global_get_curs_typwin(&g);
385
386    followlast=owl_global_should_followlast(&g);
387   
388    /* Do AIM stuff */
389    if (owl_global_is_doaimevents(&g)) {
390      owl_aim_process_events();
391
392      if (owl_global_is_aimloggedin(&g)) {
393        if (owl_timer_is_expired(owl_global_get_aim_buddyinfo_timer(&g))) {
394          /* owl_buddylist_request_idletimes(owl_global_get_buddylist(&g)); */
395          owl_timer_reset(owl_global_get_aim_buddyinfo_timer(&g));
396        }
397      }
398    }
399
400    /* little hack */
401    now=time(NULL);
402    today=localtime(&now);
403    if (today->tm_mon==9 && today->tm_mday==31 && owl_global_get_runtime(&g)<600) {
404      if (time(NULL)>nexttime) {
405        if (nexttimediff==1) {
406          nexttimediff=10;
407        } else {
408          nexttimediff=1;
409        }
410        nexttime+=nexttimediff;
411        owl_hack_animate();
412      }
413    }
414
415    /* Grab incoming messages. */
416    newmsgs=0;
417    zpendcount=0;
418    while(owl_zephyr_zpending() || owl_global_messagequeue_pending(&g)) {
419#ifdef HAVE_LIBZEPHYR
420      struct sockaddr_in from;
421#endif
422      owl_message *m=NULL;
423      owl_filter *f;
424
425      /* grab the new message, stick it in 'm' */
426      if (owl_zephyr_zpending()) {
427#ifdef HAVE_LIBZEPHYR
428        /* grab a zephyr notice, but if we've done 20 without stopping,
429           take a break to process keystrokes etc. */
430        if (zpendcount>20) break;
431        ZReceiveNotice(&notice, &from);
432        zpendcount++;
433       
434        /* is this an ack from a zephyr we sent? */
435        if (owl_zephyr_notice_is_ack(&notice)) {
436          owl_zephyr_handle_ack(&notice);
437          continue;
438        }
439       
440        /* if it's a ping and we're not viewing pings then skip it */
441        if (!owl_global_is_rxping(&g) && !strcasecmp(notice.z_opcode, "ping")) {
442          continue;
443        }
444
445        /* create the new message */
446        m=owl_malloc(sizeof(owl_message));
447        owl_message_create_from_znotice(m, &notice);
448#endif
449      } else if (owl_global_messagequeue_pending(&g)) {
450        m=owl_global_messageuque_popmsg(&g);
451      }
452     
453      /* if this message it on the puntlist, nuke it and continue */
454      if (owl_global_message_is_puntable(&g, m)) {
455        owl_message_free(m);
456        continue;
457      }
458
459      /* otherwise add it to the global list */
460      owl_messagelist_append_element(owl_global_get_msglist(&g), m);
461      newmsgs=1;
462
463      /* let the config know the new message has been received */
464      owl_perlconfig_getmsg(m, 0, NULL);
465
466      /* add it to any necessary views; right now there's only the current view */
467      owl_view_consider_message(owl_global_get_current_view(&g), m);
468
469      /* do we need to autoreply? */
470      if (owl_global_is_zaway(&g)) {
471        if (owl_message_is_type_zephyr(m)) {
472          owl_zephyr_zaway(m);
473        } else if (owl_message_is_type_aim(m)) {
474          /* can't do this, there's no mechanism not to start a loop */
475          /* owl_aim_send_im(owl_message_get_sender(m), owl_global_get_zaway_msg(&g)); */
476        }
477      }
478
479      /* ring the bell if it's a personal */
480      if (owl_global_is_personalbell(&g) &&
481          !owl_message_is_loginout(m) &&
482          !owl_message_is_mail(m) &&
483          owl_message_is_private(m)) {
484        owl_function_beep();
485      }
486
487      /* if it matches the alert filter, do the alert action */
488      f=owl_global_get_filter(&g, owl_global_get_alert_filter(&g));
489      if (f && owl_filter_message_match(f, m)) {
490        owl_function_command(owl_global_get_alert_action(&g));
491      }
492
493      /* check for burning ears message */
494      /* this is an unsupported feature */
495      if (owl_global_is_burningears(&g) && owl_message_is_burningears(m)) {
496        char *buff;
497        buff = owl_sprintf("@i(Burning ears message on class %s)", owl_message_get_class(m));
498        owl_function_adminmsg(buff, "");
499        owl_free(buff);
500        owl_function_beep();
501      }
502
503      /* log the message if we need to */
504      if (owl_global_is_logging(&g) || owl_global_is_classlogging(&g)) {
505        owl_log_incoming(m);
506      }
507    }
508
509    /* follow the last message if we're supposed to */
510    if (newmsgs && followlast) {
511      owl_function_lastmsg_noredisplay();
512    }
513
514    /* do the newmsgproc thing */
515    if (newmsgs) {
516      owl_function_do_newmsgproc();
517    }
518   
519    /* redisplay if necessary */
520    /* this should be optimized to not run if the new messages won't be displayed */
521    if (newmsgs) {
522      owl_mainwin_redisplay(owl_global_get_mainwin(&g));
523      sepbar(NULL);
524      if (owl_popwin_is_active(owl_global_get_popwin(&g))) {
525        owl_popwin_refresh(owl_global_get_popwin(&g));
526        /* TODO: this is a broken kludge */
527        if (owl_global_get_viewwin(&g)) {
528          owl_viewwin_redisplay(owl_global_get_viewwin(&g), 0);
529        }
530      }
531      owl_global_set_needrefresh(&g);
532    }
533
534    /* if a popwin just came up, refresh it */
535    pw=owl_global_get_popwin(&g);
536    if (owl_popwin_is_active(pw) && owl_popwin_needs_first_refresh(pw)) {
537      owl_popwin_refresh(pw);
538      owl_popwin_no_needs_first_refresh(pw);
539      owl_global_set_needrefresh(&g);
540      /* TODO: this is a broken kludge */
541      if (owl_global_get_viewwin(&g)) {
542        owl_viewwin_redisplay(owl_global_get_viewwin(&g), 0);
543      }
544    }
545
546    /* update the terminal if we need to */
547    if (owl_global_is_needrefresh(&g)) {
548      /* leave the cursor in the appropriate window */
549      if (owl_global_is_typwin_active(&g)) {
550        owl_function_set_cursor(typwin);
551      } else {
552        owl_function_set_cursor(sepwin);
553      }
554      doupdate();
555      owl_global_set_noneedrefresh(&g);
556    }
557
558    /* Handle all keypresses.  If no key has been pressed, sleep for a
559     * little bit, but otherwise do not.  This lets input be grabbed
560     * as quickly as possbile */
561    j=wgetch(typwin);
562    if (j==ERR) {
563      usleep(10);
564    } else {
565      /* find and activate the current keymap.
566       * TODO: this should really get fixed by activating
567       * keymaps as we switch between windows...
568       */
569      if (pw && owl_popwin_is_active(pw) && owl_global_get_viewwin(&g)) {
570        owl_context_set_popless(owl_global_get_context(&g), 
571                                owl_global_get_viewwin(&g));
572        owl_function_activate_keymap("popless");
573      } else if (owl_global_is_typwin_active(&g) 
574                 && owl_editwin_get_style(tw)==OWL_EDITWIN_STYLE_ONELINE) {
575        /*
576          owl_context_set_editline(owl_global_get_context(&g), tw);
577          owl_function_activate_keymap("editline");
578        */
579      } else if (owl_global_is_typwin_active(&g) 
580                 && owl_editwin_get_style(tw)==OWL_EDITWIN_STYLE_MULTILINE) {
581        owl_context_set_editmulti(owl_global_get_context(&g), tw);
582        owl_function_activate_keymap("editmulti");
583      } else {
584        owl_context_set_recv(owl_global_get_context(&g));
585        owl_function_activate_keymap("recv");
586      }
587      /* now actually handle the keypress */
588      ret = owl_keyhandler_process(owl_global_get_keyhandler(&g), j);
589      if (ret!=0 && ret!=1) {
590        owl_function_makemsg("Unable to handle keypress");
591      }
592    }
593
594#if OWL_STDERR_REDIR
595    stderr_redirect(newstderr);
596#endif   
597
598    /* Log any error signals */
599    {
600      siginfo_t si;
601      int signum;
602      if ((signum = owl_global_get_errsignal_and_clear(&g, &si)) > 0) {
603        owl_function_error("Got unexpected signal: %d %s  (code: %d  fd: %d  band: %d  errno: %d)", 
604                           signum, signum==SIGPIPE?"SIGPIPE":"",
605                           si.si_code, si.si_fd, si.si_band, si.si_errno);
606      }
607    }
608
609  }
610}
611
612void sig_handler(int sig, siginfo_t *si, void *data)
613{
614  if (sig==SIGWINCH) {
615    /* we can't inturrupt a malloc here, so it just sets a flag
616     * schedulding a resize for later
617     */
618    owl_function_resize();
619  } else if (sig==SIGPIPE) {
620    /* Set a flag and some info that we got the sigpipe
621     * so we can record that we got it and why... */
622    owl_global_set_errsignal(&g, sig, si);
623  }
624
625}
626
627void usage()
628{
629  fprintf(stderr, "Owl version %s\n", OWL_VERSION_STRING);
630  fprintf(stderr, "Usage: owl [-n] [-d] [-D] [-v] [-h] [-c <configfile>] [-t <ttyname>]\n");
631  fprintf(stderr, "  -n      don't load zephyr subscriptions\n");
632  fprintf(stderr, "  -d      enable debugging\n");
633  fprintf(stderr, "  -D      enable debugging and delete previous debug file\n");
634  fprintf(stderr, "  -v      print the Owl version number and exit\n");
635  fprintf(stderr, "  -h      print this help message\n");
636  fprintf(stderr, "  -c      specify an alternate config file\n");
637  fprintf(stderr, "  -t      set the tty name\n");
638}
639
640#if OWL_STDERR_REDIR
641
642/* Replaces stderr with a pipe so that we can read from it.
643 * Returns the fd of the pipe from which stderr can be read. */
644int stderr_replace(void)
645{
646  int pipefds[2];
647  if (0 != pipe(pipefds)) {
648    perror("pipe");
649    owl_function_debugmsg("stderr_replace: pipe FAILED\n");
650    return -1;
651  }
652    owl_function_debugmsg("stderr_replace: pipe: %d,%d\n", pipefds[0], pipefds[1]);
653  if (-1 == dup2(pipefds[1], 2 /*stderr*/)) {
654    owl_function_debugmsg("stderr_replace: dup2 FAILED (%s)\n", strerror(errno));
655    perror("dup2");
656    return -1;
657  }
658  return pipefds[0];
659}
660
661/* Sends stderr (read from rfd) messages to a file */
662void stderr_redirect(int rfd)
663{
664  int navail, bread;
665  char *buf;
666  /*owl_function_debugmsg("stderr_redirect: called with rfd=%d\n", rfd);*/
667  if (rfd<0) return;
668  if (-1 == ioctl(rfd, FIONREAD, (void*)&navail)) {
669    return;
670  }
671  /*owl_function_debugmsg("stderr_redirect: navail = %d\n", navail);*/
672  if (navail<=0) return;
673  if (navail>256) { navail = 256; }
674  buf = owl_malloc(navail+1);
675  bread = read(rfd, buf, navail);
676  if (buf[navail-1] != '\0') {
677    buf[navail] = '\0';
678  }
679  owl_function_error("Err: %s", buf);
680  owl_free(buf);
681}
682
683#endif /* OWL_STDERR_REDIR */
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