source: owl.c @ de22c3d

barnowl_perlaimdebianowlrelease-1.4release-1.5release-1.6release-1.7release-1.8release-1.9
Last change on this file since de22c3d was de22c3d, checked in by James M. Kretchmar <kretch@mit.edu>, 17 years ago
Formatting, version bump.
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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{
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  owl_function_debugmsg("startup: it's the very best place to start");
61
62  owl_function_debugmsg("startup: processing command line arguments");
63  argcsave=argc;
64  argvsave=argv;
65  configfile=NULL;
66  tty=NULL;
67  debug=0;
68  initialsubs=1;
69  if (argc>0) {
70    argv++;
71    argc--;
72  }
73  while (argc>0) {
74    if (!strcmp(argv[0], "-n")) {
75      initialsubs=0;
76      argv++;
77      argc--;
78    } else if (!strcmp(argv[0], "-c")) {
79      if (argc<2) {
80        fprintf(stderr, "Too few arguments to -c\n");
81        usage();
82        exit(1);
83      }
84      configfile=argv[1];
85      argv+=2;
86      argc-=2;
87    } else if (!strcmp(argv[0], "-t")) {
88      if (argc<2) {
89        fprintf(stderr, "Too few arguments to -t\n");
90        usage();
91        exit(1);
92      }
93      tty=argv[1];
94      argv+=2;
95      argc-=2;
96    } else if (!strcmp(argv[0], "-d")) {
97      debug=1;
98      argv++;
99      argc--;
100    } else if (!strcmp(argv[0], "-v")) {
101      printf("This is owl version %s\n", OWL_VERSION_STRING);
102      exit(0);
103    } else {
104      fprintf(stderr, "Uknown argument\n");
105      usage();       
106      exit(1);
107    }
108  }
109
110#ifdef HAVE_LIBZEPHYR
111  /* zephyr init */
112  owl_function_debugmsg("startup: initializing zephyr");
113  ret=owl_zephyr_initialize();
114  if (ret) {
115    exit(1);
116  }
117#endif
118 
119  /* signal handler */
120  owl_function_debugmsg("startup: setting up 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  owl_function_debugmsg("startup: initializing screen");
131  sprintf(buff, "TERMINFO=%s", TERMINFO);
132  putenv(buff);
133  initscr();
134  start_color();
135#ifdef HAVE_USE_DEFAULT_COLORS
136  use_default_colors();
137#endif
138  raw();
139  noecho();
140
141  /* define simple color pairs */
142  if (has_colors() && COLOR_PAIRS>=8) {
143    init_pair(OWL_COLOR_BLACK,   COLOR_BLACK,   -1);
144    init_pair(OWL_COLOR_RED,     COLOR_RED,     -1);
145    init_pair(OWL_COLOR_GREEN,   COLOR_GREEN,   -1);
146    init_pair(OWL_COLOR_YELLOW,  COLOR_YELLOW,  -1);
147    init_pair(OWL_COLOR_BLUE,    COLOR_BLUE,    -1);
148    init_pair(OWL_COLOR_MAGENTA, COLOR_MAGENTA, -1);
149    init_pair(OWL_COLOR_CYAN,    COLOR_CYAN,    -1);
150    init_pair(OWL_COLOR_WHITE,   COLOR_WHITE,   -1);
151  }
152
153  /* owl global init */
154  owl_function_debugmsg("startup: doing owl global initialization");
155  owl_global_init(&g);
156  if (debug) owl_global_set_debug_on(&g);
157  owl_global_set_startupargs(&g, argcsave, argvsave);
158#ifdef HAVE_LIBZEPHYR
159  owl_global_set_havezephyr(&g);
160#endif
161  owl_global_set_haveaim(&g);
162
163#if OWL_STDERR_REDIR
164  /* Do this only after we've started curses up... */
165  owl_function_debugmsg("startup: doing stderr redirection");
166  newstderr = stderr_replace();
167#endif   
168
169  /* create the owl directory, in case it does not exist */
170  owl_function_debugmsg("startup: creating owl directory, if not present");
171  dir=owl_sprintf("%s/%s", owl_global_get_homedir(&g), OWL_CONFIG_DIR);
172  mkdir(dir, S_IRWXU);
173  owl_free(dir);
174
175  /* set the tty, either from the command line, or by figuring it out */
176  owl_function_debugmsg("startup: setting tty name");
177  if (tty) {
178    owl_global_set_tty(&g, tty);
179  } else {
180    owl_global_set_tty(&g, owl_util_get_default_tty());
181  }
182
183  /* setup the built-in styles */
184  owl_function_debugmsg("startup: creating built-in styles");
185  s=owl_malloc(sizeof(owl_style));
186  owl_style_create_internal(s, "default", &owl_stylefunc_default,
187                            "Default message formatting");
188  owl_global_add_style(&g, s);
189
190  s=owl_malloc(sizeof(owl_style));
191  owl_style_create_internal(s, "basic", &owl_stylefunc_basic,
192                            "Basic message formatting.");
193  owl_global_add_style(&g, s);
194#if 0
195  s=owl_malloc(sizeof(owl_style));
196  owl_style_create_internal(s, "vt", &owl_stylefunc_vt,
197                            "VT message formatting.");
198  owl_global_add_style(&g, s);
199#endif
200  s=owl_malloc(sizeof(owl_style));
201  owl_style_create_internal(s, "oneline", &owl_stylefunc_oneline,
202                            "Formats for one-line-per-message");
203  owl_global_add_style(&g, s);
204
205  /* setup the default filters */
206  /* the personal filter will need to change again when AIM chat's are
207   *  included.  Also, there should be an %aimme% */
208  owl_function_debugmsg("startup: creating default filters");
209  f=owl_malloc(sizeof(owl_filter));
210  owl_filter_init_fromstring(f, "personal", "( type ^zephyr$ "
211                             "and class ^message$ and instance ^personal$ "
212                             "and ( recipient ^%me%$ or sender ^%me%$ ) ) "
213                             "or ( type ^aim$ and login ^none$ )");
214  owl_list_append_element(owl_global_get_filterlist(&g), f);
215
216  f=owl_malloc(sizeof(owl_filter));
217  owl_filter_init_fromstring(f, "trash", "class ^mail$ or opcode ^ping$ or type ^admin$ or ( not 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, "ping", "opcode ^ping$");
222  owl_list_append_element(owl_global_get_filterlist(&g), f);
223
224  f=owl_malloc(sizeof(owl_filter));
225  owl_filter_init_fromstring(f, "auto", "opcode ^auto$");
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, "login", "not login ^none$");
230  owl_list_append_element(owl_global_get_filterlist(&g), f);
231
232  f=owl_malloc(sizeof(owl_filter));
233  owl_filter_init_fromstring(f, "reply-lockout", "class ^noc or class ^mail$");
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, "out", "direction ^out$");
238  owl_list_append_element(owl_global_get_filterlist(&g), f);
239
240  f=owl_malloc(sizeof(owl_filter));
241  owl_filter_init_fromstring(f, "aim", "type ^aim$");
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, "zephyr", "type ^zephyr$");
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, "none", "false");
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, "all", "true");
254  owl_list_append_element(owl_global_get_filterlist(&g), f);
255
256  /* set the current view */
257  owl_function_debugmsg("startup: setting the current view");
258  owl_view_create(owl_global_get_current_view(&g), "main", f, owl_global_get_style_by_name(&g, "default"));
259
260  /* AIM init */
261  owl_function_debugmsg("startup: doing AIM initialization");
262  owl_aim_init();
263
264  /* process the startup file */
265  owl_function_debugmsg("startup: processing startup file");
266  owl_function_source(NULL);
267
268  /* read the config file */
269  owl_function_debugmsg("startup: processing config file");
270  owl_context_set_readconfig(owl_global_get_context(&g));
271  perlerr=owl_perlconfig_readconfig(configfile);
272  if (perlerr) {
273    endwin();
274    fprintf(stderr, "\nError parsing configfile: %s\n", perlerr);
275    exit(1);
276  }
277
278  /* if the config defines a formatting function, add 'perl' as a style */
279  if (owl_global_is_config_format(&g)) {
280    owl_function_debugmsg("Found perl formatting");
281    s=owl_malloc(sizeof(owl_style));
282    owl_style_create_perl(s, "perl", "owl::_format_msg_legacy_wrap",
283                          "User-defined perl style that calls owl::format_msg"
284                          "with legacy global variable support");
285    owl_global_add_style(&g, s);
286    owl_global_set_default_style(&g, "perl");
287  }
288
289  /* execute the startup function in the configfile */
290  owl_function_debugmsg("startup: executing perl startup, if applicable");
291  perlout = owl_perlconfig_execute("owl::startup();");
292  if (perlout) owl_free(perlout);
293 
294  /* hold on to the window names for convenience */
295  msgwin=owl_global_get_curs_msgwin(&g);
296  recwin=owl_global_get_curs_recwin(&g);
297  sepwin=owl_global_get_curs_sepwin(&g);
298  typwin=owl_global_get_curs_typwin(&g);
299  tw=owl_global_get_typwin(&g);
300
301  /* welcome message */
302  owl_function_debugmsg("startup: creating splash message");
303  strcpy(startupmsg, "-----------------------------------------------------------------------\n");
304  sprintf(buff,      "Welcome to Owl version %s.  Press 'h' for on-line help. \n", OWL_VERSION_STRING);
305  strcat(startupmsg, buff);
306  strcat(startupmsg, "                                                                       \n");
307  strcat(startupmsg, "If you would like to receive release announcements about Owl you can   \n");
308  strcat(startupmsg, "join the owl-users@mit.edu mailing at http://web.mit.edu/ktools/       \n");
309  strcat(startupmsg, "                                                                 ^ ^   \n");
310  strcat(startupmsg, "                                                                 OvO   \n");
311  strcat(startupmsg, "Please report any bugs or suggestions to bug-owl@mit.edu        (   )  \n");
312  strcat(startupmsg, "-----------------------------------------------------------------m-m---\n");
313  owl_function_adminmsg("", startupmsg);
314  sepbar(NULL);
315
316  wrefresh(sepwin);
317
318  /* load zephyr subs */
319  if (initialsubs) {
320    owl_function_debugmsg("startup: loading initial zephyr subs");
321    /* load normal subscriptions */
322    ret=owl_zephyr_loadsubs(NULL);
323    if (ret==-1) {
324      owl_function_adminmsg("", "Error loading zephyr subscriptions, file inaccessable");
325    } else if (ret!=0) {
326      owl_function_adminmsg("", "Error loading zephyr subscriptions");
327    }
328   
329    if (ret!=-1) {
330      owl_global_add_userclue(&g, OWL_USERCLUE_CLASSES);
331    }
332
333    /* load login subscriptions */
334    if (owl_global_is_loginsubs(&g)) {
335      owl_function_debugmsg("startup: loading login subs");
336      owl_function_loadloginsubs(NULL);
337    }
338  }
339
340  /* set the startup and default style, based on userclue and presence of a
341   * formatting function */
342  owl_function_debugmsg("startup: setting startup and default style");
343  if (0 != strcmp(owl_global_get_default_style(&g), "__unspecified__")) {
344    /* the style was set by the user: leave it alone */
345  } else if (owl_global_is_config_format(&g)) {
346    owl_global_set_default_style(&g, "perl");
347  } else if (owl_global_is_userclue(&g, OWL_USERCLUE_CLASSES)) {
348    owl_global_set_default_style(&g, "default");
349  } else {
350    owl_global_set_default_style(&g, "basic");
351  }
352
353  /* zlog in if we need to */
354  if (owl_global_is_startuplogin(&g)) {
355    owl_function_debugmsg("startup: doing zlog in");
356    owl_zephyr_zlog_in();
357  }
358
359  owl_function_debugmsg("startup: set style for the view");
360  owl_view_set_style(owl_global_get_current_view(&g), 
361                     owl_global_get_style_by_name(&g, owl_global_get_default_style(&g)));   
362
363  owl_function_debugmsg("startup: setting context interactive");
364  owl_context_set_interactive(owl_global_get_context(&g));
365
366  nexttimediff=10;
367  nexttime=time(NULL);
368
369  owl_function_debugmsg("startup: entering main loop");
370  /* main loop */
371  while (1) {
372
373    /* if a resize has been scheduled, deal with it */
374    owl_global_resize(&g, 0, 0);
375
376    /* these are here in case a resize changes the windows */
377    msgwin=owl_global_get_curs_msgwin(&g);
378    recwin=owl_global_get_curs_recwin(&g);
379    sepwin=owl_global_get_curs_sepwin(&g);
380    typwin=owl_global_get_curs_typwin(&g);
381
382    followlast=owl_global_should_followlast(&g);
383   
384    /* Do AIM stuff */
385    if (owl_global_is_doaimevents(&g)) {
386      owl_aim_process_events();
387
388      if (owl_global_is_aimloggedin(&g)) {
389        if (owl_timer_is_expired(owl_global_get_aim_buddyinfo_timer(&g))) {
390          /* owl_buddylist_request_idletimes(owl_global_get_buddylist(&g)); */
391          owl_timer_reset(owl_global_get_aim_buddyinfo_timer(&g));
392        }
393      }
394    }
395
396    /* little hack */
397    now=time(NULL);
398    today=localtime(&now);
399    if (today->tm_mon==9 && today->tm_mday==31 && owl_global_get_runtime(&g)<600) {
400      if (time(NULL)>nexttime) {
401        if (nexttimediff==1) {
402          nexttimediff=10;
403        } else {
404          nexttimediff=1;
405        }
406        nexttime+=nexttimediff;
407        owl_hack_animate();
408      }
409    }
410
411    /* Grab incoming messages. */
412    newmsgs=0;
413    zpendcount=0;
414    while(owl_zephyr_zpending() || owl_global_messagequeue_pending(&g)) {
415#ifdef HAVE_LIBZEPHYR
416      struct sockaddr_in from;
417#endif
418      owl_message *m=NULL;
419      owl_filter *f;
420
421      /* grab the new message, stick it in 'm' */
422      if (owl_zephyr_zpending()) {
423#ifdef HAVE_LIBZEPHYR
424        /* grab a zephyr notice, but if we've done 20 without stopping,
425           take a break to process keystrokes etc. */
426        if (zpendcount>20) break;
427        ZReceiveNotice(&notice, &from);
428        zpendcount++;
429       
430        /* is this an ack from a zephyr we sent? */
431        if (owl_zephyr_notice_is_ack(&notice)) {
432          owl_zephyr_handle_ack(&notice);
433          continue;
434        }
435       
436        /* if it's a ping and we're not viewing pings then skip it */
437        if (!owl_global_is_rxping(&g) && !strcasecmp(notice.z_opcode, "ping")) {
438          continue;
439        }
440
441        /* create the new message */
442        m=owl_malloc(sizeof(owl_message));
443        owl_message_create_from_znotice(m, &notice);
444#endif
445      } else if (owl_global_messagequeue_pending(&g)) {
446        m=owl_global_messageuque_popmsg(&g);
447      }
448     
449      /* if this message it on the puntlist, nuke it and continue */
450      if (owl_global_message_is_puntable(&g, m)) {
451        owl_message_free(m);
452        continue;
453      }
454
455      /* otherwise add it to the global list */
456      owl_messagelist_append_element(owl_global_get_msglist(&g), m);
457      newmsgs=1;
458
459      /* let the config know the new message has been received */
460      owl_perlconfig_getmsg(m, 0, NULL);
461
462      /* add it to any necessary views; right now there's only the current view */
463      owl_view_consider_message(owl_global_get_current_view(&g), m);
464
465      /* do we need to autoreply? */
466      if (owl_global_is_zaway(&g)) {
467        if (owl_message_is_type_zephyr(m)) {
468          owl_zephyr_zaway(m);
469        } else if (owl_message_is_type_aim(m)) {
470          /* can't do this, there's no mechanism not to start a loop */
471          /* owl_aim_send_im(owl_message_get_sender(m), owl_global_get_zaway_msg(&g)); */
472        }
473      }
474
475      /* ring the bell if it's a personal */
476      if (owl_global_is_personalbell(&g) &&
477          !owl_message_is_loginout(m) &&
478          !owl_message_is_mail(m) &&
479          owl_message_is_private(m)) {
480        owl_function_beep();
481      }
482
483      /* if it matches the alert filter, do the alert action */
484      f=owl_global_get_filter(&g, owl_global_get_alert_filter(&g));
485      if (f && owl_filter_message_match(f, m)) {
486        owl_function_command(owl_global_get_alert_action(&g));
487      }
488
489      /* check for burning ears message */
490      /* this is an unsupported feature */
491      if (owl_global_is_burningears(&g) && owl_message_is_burningears(m)) {
492        char *buff;
493        buff = owl_sprintf("@i(Burning ears message on class %s)", owl_message_get_class(m));
494        owl_function_adminmsg(buff, "");
495        owl_free(buff);
496        owl_function_beep();
497      }
498
499      /* log the message if we need to */
500      if (owl_global_is_logging(&g) || owl_global_is_classlogging(&g)) {
501        owl_log_incoming(m);
502      }
503    }
504
505    /* follow the last message if we're supposed to */
506    if (newmsgs && followlast) {
507      owl_function_lastmsg_noredisplay();
508    }
509
510    /* do the newmsgproc thing */
511    if (newmsgs) {
512      owl_function_do_newmsgproc();
513    }
514   
515    /* redisplay if necessary */
516    /* this should be optimized to not run if the new messages won't be displayed */
517    if (newmsgs) {
518      owl_mainwin_redisplay(owl_global_get_mainwin(&g));
519      sepbar(NULL);
520      if (owl_popwin_is_active(owl_global_get_popwin(&g))) {
521        owl_popwin_refresh(owl_global_get_popwin(&g));
522        /* TODO: this is a broken kludge */
523        if (owl_global_get_viewwin(&g)) {
524          owl_viewwin_redisplay(owl_global_get_viewwin(&g), 0);
525        }
526      }
527      owl_global_set_needrefresh(&g);
528    }
529
530    /* if a popwin just came up, refresh it */
531    pw=owl_global_get_popwin(&g);
532    if (owl_popwin_is_active(pw) && owl_popwin_needs_first_refresh(pw)) {
533      owl_popwin_refresh(pw);
534      owl_popwin_no_needs_first_refresh(pw);
535      owl_global_set_needrefresh(&g);
536      /* TODO: this is a broken kludge */
537      if (owl_global_get_viewwin(&g)) {
538        owl_viewwin_redisplay(owl_global_get_viewwin(&g), 0);
539      }
540    }
541
542    /* update the terminal if we need to */
543    if (owl_global_is_needrefresh(&g)) {
544      /* leave the cursor in the appropriate window */
545      if (owl_global_is_typwin_active(&g)) {
546        owl_function_set_cursor(typwin);
547      } else {
548        owl_function_set_cursor(sepwin);
549      }
550      doupdate();
551      owl_global_set_noneedrefresh(&g);
552    }
553
554    /* Handle all keypresses.  If no key has been pressed, sleep for a
555     * little bit, but otherwise do not.  This lets input be grabbed
556     * as quickly as possbile */
557    j=wgetch(typwin);
558    if (j==ERR) {
559      usleep(10);
560    } else {
561      /* find and activate the current keymap.
562       * TODO: this should really get fixed by activating
563       * keymaps as we switch between windows...
564       */
565      if (pw && owl_popwin_is_active(pw) && owl_global_get_viewwin(&g)) {
566        owl_context_set_popless(owl_global_get_context(&g), 
567                                owl_global_get_viewwin(&g));
568        owl_function_activate_keymap("popless");
569      } else if (owl_global_is_typwin_active(&g) 
570                 && owl_editwin_get_style(tw)==OWL_EDITWIN_STYLE_ONELINE) {
571        /*
572          owl_context_set_editline(owl_global_get_context(&g), tw);
573          owl_function_activate_keymap("editline");
574        */
575      } else if (owl_global_is_typwin_active(&g) 
576                 && owl_editwin_get_style(tw)==OWL_EDITWIN_STYLE_MULTILINE) {
577        owl_context_set_editmulti(owl_global_get_context(&g), tw);
578        owl_function_activate_keymap("editmulti");
579      } else {
580        owl_context_set_recv(owl_global_get_context(&g));
581        owl_function_activate_keymap("recv");
582      }
583      /* now actually handle the keypress */
584      ret = owl_keyhandler_process(owl_global_get_keyhandler(&g), j);
585      if (ret!=0 && ret!=1) {
586        owl_function_makemsg("Unable to handle keypress");
587      }
588    }
589
590#if OWL_STDERR_REDIR
591    stderr_redirect(newstderr);
592#endif   
593
594    /* Log any error signals */
595    {
596      siginfo_t si;
597      int signum;
598      if ((signum = owl_global_get_errsignal_and_clear(&g, &si)) > 0) {
599        owl_function_error("Got unexpected signal: %d %s  (code: %d  fd: %d  band: %d  errno: %d)", 
600                           signum, signum==SIGPIPE?"SIGPIPE":"",
601                           si.si_code, si.si_fd, si.si_band, si.si_errno);
602      }
603    }
604
605  }
606}
607
608void sig_handler(int sig, siginfo_t *si, void *data)
609{
610  if (sig==SIGWINCH) {
611    /* we can't inturrupt a malloc here, so it just sets a flag
612     * schedulding a resize for later
613     */
614    owl_function_resize();
615  } else if (sig==SIGPIPE) {
616    /* Set a flag and some info that we got the sigpipe
617     * so we can record that we got it and why... */
618    owl_global_set_errsignal(&g, sig, si);
619  }
620
621}
622
623void usage()
624{
625  fprintf(stderr, "Owl version %s\n", OWL_VERSION_STRING);
626  fprintf(stderr, "Usage: owl [-n] [-d] [-v] [-h] [-c <configfile>] [-t <ttyname>]\n");
627  fprintf(stderr, "  -n      don't load zephyr subscriptions\n");
628  fprintf(stderr, "  -d      enable debugging\n");
629  fprintf(stderr, "  -v      print the Owl version number and exit\n");
630  fprintf(stderr, "  -h      print this help message\n");
631  fprintf(stderr, "  -c      specify an alternate config file\n");
632  fprintf(stderr, "  -t      set the tty name\n");
633}
634
635#if OWL_STDERR_REDIR
636
637/* Replaces stderr with a pipe so that we can read from it.
638 * Returns the fd of the pipe from which stderr can be read. */
639int stderr_replace(void)
640{
641  int pipefds[2];
642  if (0 != pipe(pipefds)) {
643    perror("pipe");
644    owl_function_debugmsg("stderr_replace: pipe FAILED\n");
645    return -1;
646  }
647    owl_function_debugmsg("stderr_replace: pipe: %d,%d\n", pipefds[0], pipefds[1]);
648  if (-1 == dup2(pipefds[1], 2 /*stderr*/)) {
649    owl_function_debugmsg("stderr_replace: dup2 FAILED (%s)\n", strerror(errno));
650    perror("dup2");
651    return -1;
652  }
653  return pipefds[0];
654}
655
656/* Sends stderr (read from rfd) messages to a file */
657void stderr_redirect(int rfd)
658{
659  int navail, bread;
660  char *buf;
661  /*owl_function_debugmsg("stderr_redirect: called with rfd=%d\n", rfd);*/
662  if (rfd<0) return;
663  if (-1 == ioctl(rfd, FIONREAD, (void*)&navail)) {
664    return;
665  }
666  /*owl_function_debugmsg("stderr_redirect: navail = %d\n", navail);*/
667  if (navail<=0) return;
668  if (navail>256) { navail = 256; }
669  buf = owl_malloc(navail+1);
670  bread = read(rfd, buf, navail);
671  if (buf[navail-1] != '\0') {
672    buf[navail] = '\0';
673  }
674  owl_function_error("Err: %s", buf);
675  owl_free(buf);
676}
677
678#endif /* OWL_STDERR_REDIR */
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