source: owl.c @ 2e76340

barnowl_perlaimdebianowlrelease-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since 2e76340 was 2e76340, checked in by Erik Nygren <nygren@mit.edu>, 17 years ago
oops. didn't want to leave that debugging message there.
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File size: 21.3 KB
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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  WINDOW *recwin, *sepwin, *typwin, *msgwin;
41  owl_editwin *tw;
42  owl_popwin *pw;
43  int j, ret, initialsubs, debug, argcsave, followlast;
44  int newmsgs, zpendcount, nexttimediff;
45  struct sigaction sigact;
46  char *configfile, *tty, *perlout, *perlerr, **argvsave, buff[LINE], startupmsg[LINE];
47  owl_filter *f;
48  owl_style *s;
49  time_t nexttime, now;
50  struct tm *today;
51  char *dir;
52#ifdef HAVE_LIBZEPHYR
53  ZNotice_t notice;
54#endif
55#if OWL_STDERR_REDIR
56  int newstderr;
57#endif
58
59  owl_function_debugmsg("startup: it's the very best place to start");
60
61  owl_function_debugmsg("startup: processing command line arguments");
62  argcsave=argc;
63  argvsave=argv;
64  configfile=NULL;
65  tty=NULL;
66  debug=0;
67  initialsubs=1;
68  if (argc>0) {
69    argv++;
70    argc--;
71  }
72  while (argc>0) {
73    if (!strcmp(argv[0], "-n")) {
74      initialsubs=0;
75      argv++;
76      argc--;
77    } else if (!strcmp(argv[0], "-c")) {
78      if (argc<2) {
79        fprintf(stderr, "Too few arguments to -c\n");
80        usage();
81        exit(1);
82      }
83      configfile=argv[1];
84      argv+=2;
85      argc-=2;
86    } else if (!strcmp(argv[0], "-t")) {
87      if (argc<2) {
88        fprintf(stderr, "Too few arguments to -t\n");
89        usage();
90        exit(1);
91      }
92      tty=argv[1];
93      argv+=2;
94      argc-=2;
95    } else if (!strcmp(argv[0], "-d")) {
96      debug=1;
97      argv++;
98      argc--;
99    } else if (!strcmp(argv[0], "-v")) {
100      printf("This is owl version %s\n", OWL_VERSION_STRING);
101      exit(0);
102    } else {
103      fprintf(stderr, "Uknown argument\n");
104      usage();       
105      exit(1);
106    }
107  }
108
109#ifdef HAVE_LIBZEPHYR
110  /* zephyr init */
111  owl_function_debugmsg("startup: initializing zephyr");
112  ret=owl_zephyr_initialize();
113  if (ret) {
114    exit(1);
115  }
116#endif
117 
118  /* signal handler */
119  owl_function_debugmsg("startup: setting up signal handler");
120  /*sigact.sa_handler=sig_handler;*/
121  sigact.sa_sigaction=sig_handler;
122  sigemptyset(&sigact.sa_mask);
123  sigact.sa_flags=SA_SIGINFO;
124  sigaction(SIGWINCH, &sigact, NULL);
125  sigaction(SIGALRM, &sigact, NULL);
126  sigaction(SIGPIPE, &sigact, NULL);
127
128  /* screen init */
129  owl_function_debugmsg("startup: initializing screen");
130  sprintf(buff, "TERMINFO=%s", TERMINFO);
131  putenv(buff);
132  initscr();
133  start_color();
134#ifdef HAVE_USE_DEFAULT_COLORS
135  use_default_colors();
136#endif
137  raw();
138  noecho();
139
140  /* define simple color pairs */
141  if (has_colors() && COLOR_PAIRS>=8) {
142    init_pair(OWL_COLOR_BLACK,   COLOR_BLACK,   -1);
143    init_pair(OWL_COLOR_RED,     COLOR_RED,     -1);
144    init_pair(OWL_COLOR_GREEN,   COLOR_GREEN,   -1);
145    init_pair(OWL_COLOR_YELLOW,  COLOR_YELLOW,  -1);
146    init_pair(OWL_COLOR_BLUE,    COLOR_BLUE,    -1);
147    init_pair(OWL_COLOR_MAGENTA, COLOR_MAGENTA, -1);
148    init_pair(OWL_COLOR_CYAN,    COLOR_CYAN,    -1);
149    init_pair(OWL_COLOR_WHITE,   COLOR_WHITE,   -1);
150  }
151
152  /* owl global init */
153  owl_function_debugmsg("startup: doing owl global initialization");
154  owl_global_init(&g);
155  if (debug) owl_global_set_debug_on(&g);
156  owl_global_set_startupargs(&g, argcsave, argvsave);
157#ifdef HAVE_LIBZEPHYR
158  owl_global_set_havezephyr(&g);
159#endif
160  owl_global_set_haveaim(&g);
161
162#if OWL_STDERR_REDIR
163  /* Do this only after we've started curses up... */
164  owl_function_debugmsg("startup: doing stderr redirection");
165  newstderr = stderr_replace();
166#endif   
167
168  /* create the owl directory, in case it does not exist */
169  owl_function_debugmsg("startup: creating owl directory, if not present");
170  dir=owl_sprintf("%s/%s", owl_global_get_homedir(&g), OWL_CONFIG_DIR);
171  mkdir(dir, S_IRWXU);
172  owl_free(dir);
173
174  /* set the tty, either from the command line, or by figuring it out */
175  owl_function_debugmsg("startup: setting tty name");
176  if (tty) {
177    owl_global_set_tty(&g, tty);
178  } else {
179    owl_global_set_tty(&g, owl_util_get_default_tty());
180  }
181
182  /* setup the built-in styles */
183  owl_function_debugmsg("startup: creating built-in styles");
184  s=owl_malloc(sizeof(owl_style));
185  owl_style_create_internal(s, "default", &owl_stylefunc_default,
186                            "Default message formatting");
187  owl_global_add_style(&g, s);
188
189  s=owl_malloc(sizeof(owl_style));
190  owl_style_create_internal(s, "basic", &owl_stylefunc_basic,
191                            "Basic message formatting.");
192  owl_global_add_style(&g, s);
193#if 0
194  s=owl_malloc(sizeof(owl_style));
195  owl_style_create_internal(s, "vt", &owl_stylefunc_vt,
196                            "VT message formatting.");
197  owl_global_add_style(&g, s);
198#endif
199  s=owl_malloc(sizeof(owl_style));
200  owl_style_create_internal(s, "oneline", &owl_stylefunc_oneline,
201                            "Formats for one-line-per-message");
202  owl_global_add_style(&g, s);
203
204  /* setup the default filters */
205  /* the personal filter will need to change again when AIM chat's are
206   *  included.  Also, there should be an %aimme% */
207  owl_function_debugmsg("startup: creating default filters");
208  f=owl_malloc(sizeof(owl_filter));
209  owl_filter_init_fromstring(f, "personal", "( type ^zephyr$ "
210                             "and class ^message$ and instance ^personal$ "
211                             "and ( recipient ^%me%$ or sender ^%me%$ ) ) "
212                             "or ( type ^aim$ and login ^none$ )");
213  owl_list_append_element(owl_global_get_filterlist(&g), f);
214
215  f=owl_malloc(sizeof(owl_filter));
216  owl_filter_init_fromstring(f, "trash", "class ^mail$ or opcode ^ping$ or type ^admin$ or ( not login ^none$ )");
217  owl_list_append_element(owl_global_get_filterlist(&g), f);
218
219  f=owl_malloc(sizeof(owl_filter));
220  owl_filter_init_fromstring(f, "ping", "opcode ^ping$");
221  owl_list_append_element(owl_global_get_filterlist(&g), f);
222
223  f=owl_malloc(sizeof(owl_filter));
224  owl_filter_init_fromstring(f, "auto", "opcode ^auto$");
225  owl_list_append_element(owl_global_get_filterlist(&g), f);
226
227  f=owl_malloc(sizeof(owl_filter));
228  owl_filter_init_fromstring(f, "login", "not login ^none$");
229  owl_list_append_element(owl_global_get_filterlist(&g), f);
230
231  f=owl_malloc(sizeof(owl_filter));
232  owl_filter_init_fromstring(f, "reply-lockout", "class ^noc or class ^mail$");
233  owl_list_append_element(owl_global_get_filterlist(&g), f);
234
235  f=owl_malloc(sizeof(owl_filter));
236  owl_filter_init_fromstring(f, "out", "direction ^out$");
237  owl_list_append_element(owl_global_get_filterlist(&g), f);
238
239  f=owl_malloc(sizeof(owl_filter));
240  owl_filter_init_fromstring(f, "aim", "type ^aim$");
241  owl_list_append_element(owl_global_get_filterlist(&g), f);
242
243  f=owl_malloc(sizeof(owl_filter));
244  owl_filter_init_fromstring(f, "zephyr", "type ^zephyr$");
245  owl_list_append_element(owl_global_get_filterlist(&g), f);
246
247  f=owl_malloc(sizeof(owl_filter));
248  owl_filter_init_fromstring(f, "none", "false");
249  owl_list_append_element(owl_global_get_filterlist(&g), f);
250
251  f=owl_malloc(sizeof(owl_filter));
252  owl_filter_init_fromstring(f, "all", "true");
253  owl_list_append_element(owl_global_get_filterlist(&g), f);
254
255  /* set the current view */
256  owl_function_debugmsg("startup: setting the current view");
257  owl_view_create(owl_global_get_current_view(&g), "main", f, owl_global_get_style_by_name(&g, "default"));
258
259  /* AIM init */
260  owl_function_debugmsg("startup: doing AIM initialization");
261  owl_aim_init();
262
263  /* process the startup file */
264  owl_function_debugmsg("startup: processing startup file");
265  owl_function_source(NULL);
266
267  /* read the config file */
268  owl_function_debugmsg("startup: processing config file");
269  owl_context_set_readconfig(owl_global_get_context(&g));
270  perlerr=owl_perlconfig_readconfig(configfile);
271  if (perlerr) {
272    endwin();
273    fprintf(stderr, "\nError parsing configfile: %s\n", perlerr);
274    exit(1);
275  }
276
277  /* if the config defines a formatting function, add 'perl' as a style */
278  if (owl_global_is_config_format(&g)) {
279    owl_function_debugmsg("Found perl formatting");
280    s=owl_malloc(sizeof(owl_style));
281    owl_style_create_perl(s, "perl", "owl::_format_msg_legacy_wrap",
282                          "User-defined perl style that calls owl::format_msg"
283                          "with legacy global variable support");
284    owl_global_add_style(&g, s);
285    owl_global_set_default_style(&g, "perl");
286  }
287
288  /* execute the startup function in the configfile */
289  owl_function_debugmsg("startup: executing perl startup, if applicable");
290  perlout = owl_perlconfig_execute("owl::startup();");
291  if (perlout) owl_free(perlout);
292 
293  /* hold on to the window names for convenience */
294  msgwin=owl_global_get_curs_msgwin(&g);
295  recwin=owl_global_get_curs_recwin(&g);
296  sepwin=owl_global_get_curs_sepwin(&g);
297  typwin=owl_global_get_curs_typwin(&g);
298  tw=owl_global_get_typwin(&g);
299
300  /* welcome message */
301  owl_function_debugmsg("startup: creating splash message");
302  strcpy(startupmsg, "-----------------------------------------------------------------------\n");
303  sprintf(buff,      "Welcome to Owl version %s.  Press 'h' for on-line help. \n", OWL_VERSION_STRING);
304  strcat(startupmsg, buff);
305  strcat(startupmsg, "                                                                       \n");
306  strcat(startupmsg, "If you would like to receive release announcements about Owl you can   \n");
307  strcat(startupmsg, "join the owl-users@mit.edu mailing at http://web.mit.edu/ktools/       \n");
308  strcat(startupmsg, "                                                                 ^ ^   \n");
309  strcat(startupmsg, "                                                                 OvO   \n");
310  strcat(startupmsg, "Please report any bugs or suggestions to bug-owl@mit.edu        (   )  \n");
311  strcat(startupmsg, "-----------------------------------------------------------------m-m---\n");
312  owl_function_adminmsg("", startupmsg);
313  sepbar(NULL);
314
315  wrefresh(sepwin);
316
317  /* load zephyr subs */
318  if (initialsubs) {
319    owl_function_debugmsg("startup: loading initial zephyr subs");
320    /* load normal subscriptions */
321    ret=owl_zephyr_loadsubs(NULL);
322    if (ret==-1) {
323      owl_function_adminmsg("", "Error loading zephyr subscriptions, file inaccessable");
324    } else if (ret!=0) {
325      owl_function_adminmsg("", "Error loading zephyr subscriptions");
326    }
327   
328    if (ret!=-1) {
329      owl_global_add_userclue(&g, OWL_USERCLUE_CLASSES);
330    }
331
332    /* load login subscriptions */
333    if (owl_global_is_loginsubs(&g)) {
334      owl_function_debugmsg("startup: loading login subs");
335      owl_function_loadloginsubs(NULL);
336    }
337  }
338
339  /* set the startup and default style, based on userclue and presence of a
340   * formatting function */
341  owl_function_debugmsg("startup: setting startup and default style");
342  if (0 != strcmp(owl_global_get_default_style(&g), "__unspecified__")) {
343    /* the style was set by the user: leave it alone */
344  } else if (owl_global_is_config_format(&g)) {
345    owl_global_set_default_style(&g, "perl");
346  } else if (owl_global_is_userclue(&g, OWL_USERCLUE_CLASSES)) {
347    owl_global_set_default_style(&g, "default");
348  } else {
349    owl_global_set_default_style(&g, "basic");
350  }
351
352  /* zlog in if we need to */
353  if (owl_global_is_startuplogin(&g)) {
354    owl_function_debugmsg("startup: doing zlog in");
355    owl_zephyr_zlog_in();
356  }
357
358  owl_function_debugmsg("startup: set style for the view");
359  owl_view_set_style(owl_global_get_current_view(&g), 
360                     owl_global_get_style_by_name(&g, owl_global_get_default_style(&g)));   
361
362  owl_function_debugmsg("startup: setting context interactive");
363  owl_context_set_interactive(owl_global_get_context(&g));
364
365  nexttimediff=10;
366  nexttime=time(NULL);
367
368  owl_function_debugmsg("startup: entering main loop");
369  /* main loop */
370  while (1) {
371
372    /* if a resize has been scheduled, deal with it */
373    owl_global_resize(&g, 0, 0);
374
375    /* these are here in case a resize changes the windows */
376    msgwin=owl_global_get_curs_msgwin(&g);
377    recwin=owl_global_get_curs_recwin(&g);
378    sepwin=owl_global_get_curs_sepwin(&g);
379    typwin=owl_global_get_curs_typwin(&g);
380
381    followlast=owl_global_should_followlast(&g);
382   
383    /* Do AIM stuff */
384    if (owl_global_is_doaimevents(&g)) {
385      owl_aim_process_events();
386
387      if (owl_global_is_aimloggedin(&g)) {
388        if (owl_timer_is_expired(owl_global_get_aim_buddyinfo_timer(&g))) {
389          /* owl_buddylist_request_idletimes(owl_global_get_buddylist(&g)); */
390          owl_timer_reset(owl_global_get_aim_buddyinfo_timer(&g));
391        }
392      }
393    }
394
395    /* little hack */
396    now=time(NULL);
397    today=localtime(&now);
398    if (today->tm_mon==9 && today->tm_mday==31 && owl_global_get_runtime(&g)<600) {
399      if (time(NULL)>nexttime) {
400        if (nexttimediff==1) {
401          nexttimediff=10;
402        } else {
403          nexttimediff=1;
404        }
405        nexttime+=nexttimediff;
406        owl_hack_animate();
407      }
408    }
409
410    /* Grab incoming messages. */
411    newmsgs=0;
412    zpendcount=0;
413    while(owl_zephyr_zpending() || owl_global_messagequeue_pending(&g)) {
414#ifdef HAVE_LIBZEPHYR
415      struct sockaddr_in from;
416#endif
417      owl_message *m=NULL;
418      owl_filter *f;
419
420      /* grab the new message, stick it in 'm' */
421      if (owl_zephyr_zpending()) {
422#ifdef HAVE_LIBZEPHYR
423        /* grab a zephyr notice, but if we've done 20 without stopping,
424           take a break to process keystrokes etc. */
425        if (zpendcount>20) break;
426        ZReceiveNotice(&notice, &from);
427        zpendcount++;
428       
429        /* is this an ack from a zephyr we sent? */
430        if (owl_zephyr_notice_is_ack(&notice)) {
431          owl_zephyr_handle_ack(&notice);
432          continue;
433        }
434       
435        /* if it's a ping and we're not viewing pings then skip it */
436        if (!owl_global_is_rxping(&g) && !strcasecmp(notice.z_opcode, "ping")) {
437          continue;
438        }
439
440        /* create the new message */
441        m=owl_malloc(sizeof(owl_message));
442        owl_message_create_from_znotice(m, &notice);
443#endif
444      } else if (owl_global_messagequeue_pending(&g)) {
445        m=owl_global_messageuque_popmsg(&g);
446      }
447     
448      /* if this message it on the puntlist, nuke it and continue */
449      if (owl_global_message_is_puntable(&g, m)) {
450        owl_message_free(m);
451        continue;
452      }
453
454      /* otherwise add it to the global list */
455      owl_messagelist_append_element(owl_global_get_msglist(&g), m);
456      newmsgs=1;
457
458      /* let the config know the new message has been received */
459      owl_perlconfig_getmsg(m, 0, NULL);
460
461      /* add it to any necessary views; right now there's only the current view */
462      owl_view_consider_message(owl_global_get_current_view(&g), m);
463
464      /* do we need to autoreply? */
465      if (owl_global_is_zaway(&g)) {
466        if (owl_message_is_type_zephyr(m)) {
467          owl_zephyr_zaway(m);
468        } else if (owl_message_is_type_aim(m)) {
469          /* can't do this, there's no mechanism not to start a loop */
470          /* owl_aim_send_im(owl_message_get_sender(m), owl_global_get_zaway_msg(&g)); */
471        }
472      }
473
474      /* ring the bell if it's a personal */
475      if (owl_global_is_personalbell(&g) &&
476          !owl_message_is_loginout(m) &&
477          !owl_message_is_mail(m) &&
478          owl_message_is_private(m)) {
479        owl_function_beep();
480      }
481
482      /* if it matches the alert filter, do the alert action */
483      f=owl_global_get_filter(&g, owl_global_get_alert_filter(&g));
484      if (f && owl_filter_message_match(f, m)) {
485        owl_function_command(owl_global_get_alert_action(&g));
486      }
487
488      /* check for burning ears message */
489      /* this is an unsupported feature */
490      if (owl_global_is_burningears(&g) && owl_message_is_burningears(m)) {
491        char *buff;
492        buff = owl_sprintf("@i(Burning ears message on class %s)", owl_message_get_class(m));
493        owl_function_adminmsg(buff, "");
494        owl_free(buff);
495        owl_function_beep();
496      }
497
498      /* log the message if we need to */
499      if (owl_global_is_logging(&g) || owl_global_is_classlogging(&g)) {
500        owl_log_incoming(m);
501      }
502    }
503
504    /* follow the last message if we're supposed to */
505    if (newmsgs && followlast) {
506      owl_function_lastmsg_noredisplay();
507    }
508
509    /* do the newmsgproc thing */
510    if (newmsgs) {
511      owl_function_do_newmsgproc();
512    }
513   
514    /* redisplay if necessary */
515    /* this should be optimized to not run if the new messages won't be displayed */
516    if (newmsgs) {
517      owl_mainwin_redisplay(owl_global_get_mainwin(&g));
518      sepbar(NULL);
519      if (owl_popwin_is_active(owl_global_get_popwin(&g))) {
520        owl_popwin_refresh(owl_global_get_popwin(&g));
521        /* TODO: this is a broken kludge */
522        if (owl_global_get_viewwin(&g)) {
523          owl_viewwin_redisplay(owl_global_get_viewwin(&g), 0);
524        }
525      }
526      owl_global_set_needrefresh(&g);
527    }
528
529    /* if a popwin just came up, refresh it */
530    pw=owl_global_get_popwin(&g);
531    if (owl_popwin_is_active(pw) && owl_popwin_needs_first_refresh(pw)) {
532      owl_popwin_refresh(pw);
533      owl_popwin_no_needs_first_refresh(pw);
534      owl_global_set_needrefresh(&g);
535      /* TODO: this is a broken kludge */
536      if (owl_global_get_viewwin(&g)) {
537        owl_viewwin_redisplay(owl_global_get_viewwin(&g), 0);
538      }
539    }
540
541    /* update the terminal if we need to */
542    if (owl_global_is_needrefresh(&g)) {
543      /* leave the cursor in the appropriate window */
544      if (owl_global_is_typwin_active(&g)) {
545        owl_function_set_cursor(typwin);
546      } else {
547        owl_function_set_cursor(sepwin);
548      }
549      doupdate();
550      owl_global_set_noneedrefresh(&g);
551    }
552
553    /* Handle all keypresses.  If no key has been pressed, sleep for a
554     * little bit, but otherwise do not.  This lets input be grabbed
555     * as quickly as possbile */
556    j=wgetch(typwin);
557    if (j==ERR) {
558      usleep(10);
559    } else {
560      /* find and activate the current keymap.
561       * TODO: this should really get fixed by activating
562       * keymaps as we switch between windows...
563       */
564      if (pw && owl_popwin_is_active(pw) && owl_global_get_viewwin(&g)) {
565        owl_context_set_popless(owl_global_get_context(&g), 
566                                owl_global_get_viewwin(&g));
567        owl_function_activate_keymap("popless");
568      } else if (owl_global_is_typwin_active(&g) 
569                 && owl_editwin_get_style(tw)==OWL_EDITWIN_STYLE_ONELINE) {
570        /*
571          owl_context_set_editline(owl_global_get_context(&g), tw);
572          owl_function_activate_keymap("editline");
573        */
574      } else if (owl_global_is_typwin_active(&g) 
575                 && owl_editwin_get_style(tw)==OWL_EDITWIN_STYLE_MULTILINE) {
576        owl_context_set_editmulti(owl_global_get_context(&g), tw);
577        owl_function_activate_keymap("editmulti");
578      } else {
579        owl_context_set_recv(owl_global_get_context(&g));
580        owl_function_activate_keymap("recv");
581      }
582      /* now actually handle the keypress */
583      ret = owl_keyhandler_process(owl_global_get_keyhandler(&g), j);
584      if (ret!=0 && ret!=1) {
585        owl_function_makemsg("Unable to handle keypress");
586      }
587    }
588
589#if OWL_STDERR_REDIR
590    stderr_redirect(newstderr);
591#endif   
592
593    /* Log any error signals */
594    {
595      siginfo_t si;
596      int signum;
597      if ((signum = owl_global_get_errsignal_and_clear(&g, &si)) > 0) {
598        owl_function_error("Got unexpected signal: %d %s  (code: %d  fd: %d  band: %d  errno: %d)", 
599                           signum, signum==SIGPIPE?"SIGPIPE":"",
600                           si.si_code, si.si_fd, si.si_band, si.si_errno);
601      }
602    }
603
604  }
605}
606
607void sig_handler(int sig, siginfo_t *si, void *data) {
608  if (sig==SIGWINCH) {
609    /* we can't inturrupt a malloc here, so it just sets a flag
610     * schedulding a resize for later
611     */
612    owl_function_resize();
613  } else if (sig==SIGPIPE) {
614    /* Set a flag and some info that we got the sigpipe
615     * so we can record that we got it and why... */
616    owl_global_set_errsignal(&g, sig, si);
617  }
618
619}
620
621void usage() {
622  fprintf(stderr, "Owl version %s\n", OWL_VERSION_STRING);
623  fprintf(stderr, "Usage: owl [-n] [-d] [-v] [-h] [-c <configfile>] [-t <ttyname>]\n");
624  fprintf(stderr, "  -n      don't load zephyr subscriptions\n");
625  fprintf(stderr, "  -d      enable debugging\n");
626  fprintf(stderr, "  -v      print the Owl version number and exit\n");
627  fprintf(stderr, "  -h      print this help message\n");
628  fprintf(stderr, "  -c      specify an alternate config file\n");
629  fprintf(stderr, "  -t      set the tty name\n");
630}
631
632
633
634#if OWL_STDERR_REDIR
635
636/* Replaces stderr with a pipe so that we can read from it.
637 * Returns the fd of the pipe from which stderr can be read. */
638int stderr_replace(void) {
639  int pipefds[2];
640  if (0 != pipe(pipefds)) {
641    perror("pipe");
642    owl_function_debugmsg("stderr_replace: pipe FAILED\n");
643    return -1;
644  }
645    owl_function_debugmsg("stderr_replace: pipe: %d,%d\n", pipefds[0], pipefds[1]);
646  if (-1 == dup2(pipefds[1], 2 /*stderr*/)) {
647    owl_function_debugmsg("stderr_replace: dup2 FAILED (%s)\n", strerror(errno));
648    perror("dup2");
649    return -1;
650  }
651  return pipefds[0];
652}
653
654/* Sends stderr (read from rfd) messages to a file */
655void stderr_redirect(int rfd) {
656  int navail, bread;
657  char *buf;
658  /*owl_function_debugmsg("stderr_redirect: called with rfd=%d\n", rfd);*/
659  if (rfd<0) return;
660  if (-1 == ioctl(rfd, FIONREAD, (void*)&navail)) {
661    return;
662  }
663  /*owl_function_debugmsg("stderr_redirect: navail = %d\n", navail);*/
664  if (navail<=0) return;
665  if (navail>256) { navail = 256; }
666  buf = owl_malloc(navail+1);
667  bread = read(rfd, buf, navail);
668  if (buf[navail-1] != '\0') {
669    buf[navail] = '\0';
670  }
671  owl_function_error("Err: %s", buf);
672  owl_free(buf);
673}
674
675#endif /* OWL_STDERR_REDIR */
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