Annotation of gforth/io.c, revision 1.4

1.1       anton       1: /*     direct key io driver
                      2: 
                      3:        The following is stolen from the readline library for bash
                      4: */
                      5: 
1.2       benschop    6: /* Use -DDOMAINOS for Apollo Domain-OS.
                      7:    Use -D_POSIX_VERSION for POSIX systems.
                      8: */
                      9: 
                     10: #ifdef DOMAINOS
                     11: #define _POSIX_VERSION
                     12: #endif
                     13: 
1.1       anton      14: #include <stdio.h>
                     15: #include <signal.h>
                     16: #include <sys/types.h>
1.2       benschop   17: #ifndef DOMAINOS
1.1       anton      18: #include <sys/ioctl.h>
1.2       benschop   19: #endif
1.1       anton      20: #include <fcntl.h>
                     21: #include <sys/file.h>
1.4     ! anton      22: #include <setjmp.h>
        !            23: #include "forth.h"
        !            24: #include "io.h"
1.1       anton      25: 
                     26: #if defined (__GNUC__)
                     27: #  define alloca __builtin_alloca
                     28: #else
                     29: #  if defined (sparc) || defined (HAVE_ALLOCA_H)
                     30: #    include <alloca.h>
                     31: #  endif
                     32: #endif
                     33: 
                     34: #if defined (HAVE_UNISTD_H)
                     35: #  include <unistd.h>
                     36: #endif
                     37: 
                     38: #define NEW_TTY_DRIVER
                     39: #define HAVE_BSD_SIGNALS
1.2       benschop   40: #ifndef DOMAINOS
1.1       anton      41: #define USE_XON_XOFF
1.2       benschop   42: #endif
1.1       anton      43: 
                     44: /* Some USG machines have BSD signal handling (sigblock, sigsetmask, etc.) */
                     45: #if defined (USG) && !defined (hpux)
                     46: #undef HAVE_BSD_SIGNALS
                     47: #endif
                     48: 
                     49: /* System V machines use termio. */
                     50: #if !defined (_POSIX_VERSION)
                     51: #  if defined (USG) || defined (hpux) || defined (Xenix) || defined (sgi) || defined (DGUX) || defined (ultrix)
                     52: #    undef NEW_TTY_DRIVER
                     53: #    define TERMIO_TTY_DRIVER
                     54: #    include <termio.h>
                     55: #    if !defined (TCOON)
                     56: #      define TCOON 1
                     57: #    endif
                     58: #  endif /* USG || hpux || Xenix || sgi || DUGX || ultrix*/
                     59: #endif /* !_POSIX_VERSION */
                     60: 
                     61: /* Posix systems use termios and the Posix signal functions. */
                     62: #if defined (_POSIX_VERSION)
                     63: #  if !defined (TERMIOS_MISSING)
                     64: #    undef NEW_TTY_DRIVER
                     65: #    define TERMIOS_TTY_DRIVER
                     66: #    include <termios.h>
                     67: #  endif /* !TERMIOS_MISSING */
                     68: #  define HAVE_POSIX_SIGNALS
                     69: #  if !defined (O_NDELAY)
                     70: #    define O_NDELAY O_NONBLOCK        /* Posix-style non-blocking i/o */
                     71: #  endif /* O_NDELAY */
                     72: #endif /* _POSIX_VERSION */
                     73: 
                     74: /* Other (BSD) machines use sgtty. */
                     75: #if defined (NEW_TTY_DRIVER)
                     76: #include <sgtty.h>
                     77: #endif
                     78: 
                     79: /* Define _POSIX_VDISABLE if we are not using the `new' tty driver and
                     80:    it is not already defined.  It is used both to determine if a
                     81:    special character is disabled and to disable certain special
                     82:    characters.  Posix systems should set to 0, USG systems to -1. */
                     83: #if !defined (NEW_TTY_DRIVER) && !defined (_POSIX_VDISABLE)
                     84: #  if defined (_POSIX_VERSION)
                     85: #    define _POSIX_VDISABLE 0
                     86: #  else /* !_POSIX_VERSION */
                     87: #    define _POSIX_VDISABLE -1
                     88: #  endif /* !_POSIX_VERSION */
                     89: #endif /* !NEW_TTY_DRIVER && !_POSIX_VDISABLE */
                     90: 
                     91: #include <errno.h>
                     92: extern int errno;
                     93: 
                     94: #if defined (SHELL)
                     95: #  include <posixstat.h>
                     96: #else
                     97: #  include <sys/stat.h>
                     98: #endif /* !SHELL */
                     99: /* #define HACK_TERMCAP_MOTION */
                    100: 
                    101: #if defined (USG) && defined (hpux)
                    102: #  if !defined (USGr3)
                    103: #    define USGr3
                    104: #  endif /* USGr3 */
                    105: #endif /* USG && hpux */
                    106: 
1.2       benschop  107: #if (defined (_POSIX_VERSION) || defined (USGr3)) && !defined(DOMAINOS)
1.1       anton     108: #  include <dirent.h>
                    109: #  define direct dirent
                    110: #  if defined (_POSIX_VERSION)
                    111: #    define D_NAMLEN(d) (strlen ((d)->d_name))
                    112: #  else /* !_POSIX_VERSION */
                    113: #    define D_NAMLEN(d) ((d)->d_reclen)
                    114: #  endif /* !_POSIX_VERSION */
                    115: #else /* !_POSIX_VERSION && !USGr3 */
                    116: #  define D_NAMLEN(d) ((d)->d_namlen)
                    117: #  if !defined (USG)
                    118: #    include <sys/dir.h>
                    119: #  else /* USG */
                    120: #    if defined (Xenix)
                    121: #      include <sys/ndir.h>
                    122: #    else /* !Xenix */
                    123: #      include <ndir.h>
                    124: #    endif /* !Xenix */
                    125: #  endif /* USG */
                    126: #endif /* !POSIX_VERSION && !USGr3 */
                    127: 
                    128: #if defined (USG) && defined (TIOCGWINSZ)
                    129: #  include <sys/stream.h>
                    130: #  if defined (USGr4) || defined (USGr3)
                    131: #    if defined (Symmetry) || defined (_SEQUENT_)
                    132: #      include <sys/pte.h>
                    133: #    else
                    134: #      include <sys/ptem.h>
                    135: #    endif /* !Symmetry || _SEQUENT_ */
                    136: #  endif /* USGr4 */
                    137: #endif /* USG && TIOCGWINSZ */
                    138: 
                    139: #if defined (TERMIOS_TTY_DRIVER)
                    140: static struct termios otio;
                    141: #else
                    142: static struct termio otio;
                    143: #endif /* !TERMIOS_TTY_DRIVER */
                    144: 
                    145: /* Non-zero means echo characters as they are read. */
                    146: int readline_echoing_p = 1;
                    147: 
                    148: /* The character that can generate an EOF.  Really read from
                    149:    the terminal driver... just defaulted here. */
                    150: 
                    151: #ifndef CTRL
                    152: #define CTRL(key)      ((key)-'@')
                    153: #endif
                    154: 
                    155: static int eof_char = CTRL ('D');
                    156: 
                    157: /* **************************************************************** */
                    158: /*                                                                 */
                    159: /*                   Saving and Restoring the TTY                  */
                    160: /*                                                                 */
                    161: /* **************************************************************** */
                    162: 
                    163: /* Non-zero means that the terminal is in a prepped state. */
                    164: static int terminal_prepped = 0;
                    165: 
                    166: #if defined (NEW_TTY_DRIVER)
                    167: 
                    168: /* Standard flags, including ECHO. */
                    169: static int original_tty_flags = 0;
                    170: 
                    171: /* Local mode flags, like LPASS8. */
                    172: static int local_mode_flags = 0;
                    173: 
                    174: /* Terminal characters.  This has C-s and C-q in it. */
                    175: static struct tchars original_tchars;
                    176: 
                    177: /* Local special characters.  This has the interrupt characters in it. */
                    178: #if defined (TIOCGLTC)
                    179: static struct ltchars original_ltchars;
                    180: #endif
                    181: 
                    182: /* Bind KEY to FUNCTION.  Returns non-zero if KEY is out of range. */
                    183: 
                    184: #if defined (TIOCGETC)
                    185: #if defined (USE_XON_XOFF)
                    186: 
                    187: int
                    188: bind_key (key, function)
                    189:      int key;
                    190:      Function *function;
                    191: {
                    192:   if (key < 0)
                    193:     return (key);
                    194: 
                    195:   if (key > 127 && key < 256)
                    196:     {
                    197:       if (keymap[ESC].type == ISKMAP)
                    198:        {
                    199:          Keymap escmap = (Keymap)keymap[ESC].function;
                    200: 
                    201:          key -= 128;
                    202:          escmap[key].type = ISFUNC;
                    203:          escmap[key].function = function;
                    204:          return (0);
                    205:        }
                    206:       return (key);
                    207:     }
                    208: 
                    209:   keymap[key].type = ISFUNC;
                    210:   keymap[key].function = function;
                    211:  return (0);
                    212: }
                    213: #endif
                    214: #endif
                    215: 
                    216: /* We use this to get and set the tty_flags. */
                    217: static struct sgttyb the_ttybuff;
                    218: 
                    219: #if defined (USE_XON_XOFF)
                    220: /* If the terminal was in xoff state when we got to it, then xon_char
                    221:    contains the character that is supposed to start it again. */
                    222: static int xon_char, xoff_state;
                    223: #endif /* USE_XON_XOFF */
                    224: 
                    225: /* **************************************************************** */
                    226: /*                                                                 */
                    227: /*                     Bogus Flow Control                          */
                    228: /*                                                                 */
                    229: /* **************************************************************** */
                    230: 
                    231: restart_output (count, key)
                    232:      int count, key;
                    233: {
                    234:   int fildes = fileno (stdin);
                    235: #if defined (TIOCSTART)
                    236: #if defined (apollo)
                    237:   ioctl (&fildes, TIOCSTART, 0);
                    238: #else
                    239:   ioctl (fildes, TIOCSTART, 0);
                    240: #endif /* apollo */
                    241: 
                    242: #else
                    243: #  if defined (TERMIOS_TTY_DRIVER)
                    244:         tcflow (fildes, TCOON);
                    245: #  else
                    246: #    if defined (TCXONC)
                    247:         ioctl (fildes, TCXONC, TCOON);
                    248: #    endif /* TCXONC */
                    249: #  endif /* !TERMIOS_TTY_DRIVER */
                    250: #endif /* TIOCSTART */
                    251: }
                    252: 
                    253: /* Put the terminal in CBREAK mode so that we can detect key presses. */
                    254: void prep_terminal ()
                    255: {
                    256:   int tty = fileno (stdin);
                    257: #if defined (HAVE_BSD_SIGNALS)
                    258:   int oldmask;
                    259: #endif /* HAVE_BSD_SIGNALS */
                    260: 
                    261:   if (terminal_prepped)
                    262:     return;
                    263: 
                    264:   oldmask = sigblock (sigmask (SIGINT));
                    265: 
                    266:   /* We always get the latest tty values.  Maybe stty changed them. */
                    267:   ioctl (tty, TIOCGETP, &the_ttybuff);
                    268:   original_tty_flags = the_ttybuff.sg_flags;
                    269: 
                    270:   readline_echoing_p = (original_tty_flags & ECHO);
                    271: 
                    272: #if defined (TIOCLGET)
                    273:   ioctl (tty, TIOCLGET, &local_mode_flags);
                    274: #endif
                    275: 
                    276: #if !defined (ANYP)
                    277: #  define ANYP (EVENP | ODDP)
                    278: #endif
                    279: 
                    280:   /* If this terminal doesn't care how the 8th bit is used,
                    281:      then we can use it for the meta-key.  We check by seeing
                    282:      if BOTH odd and even parity are allowed. */
                    283:   if (the_ttybuff.sg_flags & ANYP)
                    284:     {
                    285: #if defined (PASS8)
                    286:       the_ttybuff.sg_flags |= PASS8;
                    287: #endif
                    288: 
                    289:       /* Hack on local mode flags if we can. */
                    290: #if defined (TIOCLGET) && defined (LPASS8)
                    291:       {
                    292:        int flags;
                    293:        flags = local_mode_flags | LPASS8;
                    294:        ioctl (tty, TIOCLSET, &flags);
                    295:       }
                    296: #endif /* TIOCLGET && LPASS8 */
                    297:     }
                    298: 
                    299: #if defined (TIOCGETC)
                    300:   {
                    301:     struct tchars temp;
                    302: 
                    303:     ioctl (tty, TIOCGETC, &original_tchars);
                    304:     temp = original_tchars;
                    305: 
                    306: #if defined (USE_XON_XOFF)
                    307:     /* Get rid of C-s and C-q.
                    308:        We remember the value of startc (C-q) so that if the terminal is in
                    309:        xoff state, the user can xon it by pressing that character. */
                    310:     xon_char = temp.t_startc;
                    311:     temp.t_stopc = -1;
                    312:     temp.t_startc = -1;
                    313: 
                    314:     /* If there is an XON character, bind it to restart the output. */
                    315:     if (xon_char != -1)
                    316:       bind_key (xon_char, restart_output);
                    317: #endif /* USE_XON_XOFF */
                    318: 
                    319:     /* If there is an EOF char, bind eof_char to it. */
                    320:     if (temp.t_eofc != -1)
                    321:       eof_char = temp.t_eofc;
                    322: 
                    323: #if defined (NO_KILL_INTR)
                    324:     /* Get rid of C-\ and C-c. */
                    325:     temp.t_intrc = temp.t_quitc = -1;
                    326: #endif /* NO_KILL_INTR */
                    327: 
                    328:     ioctl (tty, TIOCSETC, &temp);
                    329:   }
                    330: #endif /* TIOCGETC */
                    331: 
                    332: #if defined (TIOCGLTC)
                    333:   {
                    334:     struct ltchars temp;
                    335: 
                    336:     ioctl (tty, TIOCGLTC, &original_ltchars);
                    337:     temp = original_ltchars;
                    338: 
                    339:     /* Make the interrupt keys go away.  Just enough to make people
                    340:        happy. */
                    341:     temp.t_dsuspc = -1;        /* C-y */
                    342:     temp.t_lnextc = -1;        /* C-v */
                    343: 
                    344:     ioctl (tty, TIOCSLTC, &temp);
                    345:   }
                    346: #endif /* TIOCGLTC */
                    347: 
                    348:   the_ttybuff.sg_flags &= ~(ECHO | CRMOD);
                    349:   the_ttybuff.sg_flags |= CBREAK;
                    350:   ioctl (tty, TIOCSETN, &the_ttybuff);
                    351: 
                    352:   terminal_prepped = 1;
                    353: 
                    354: #if defined (HAVE_BSD_SIGNALS)
                    355:   sigsetmask (oldmask);
                    356: #endif
                    357: }
                    358: 
                    359: /* Restore the terminal to its original state. */
                    360: void deprep_terminal ()
                    361: {
                    362:   int tty = fileno (stdin);
                    363: #if defined (HAVE_BSD_SIGNALS)
                    364:   int oldmask;
                    365: #endif
                    366: 
                    367:   if (!terminal_prepped)
                    368:     return;
                    369: 
                    370:   oldmask = sigblock (sigmask (SIGINT));
                    371: 
                    372:   the_ttybuff.sg_flags = original_tty_flags;
                    373:   ioctl (tty, TIOCSETN, &the_ttybuff);
                    374:   readline_echoing_p = 1;
                    375: 
                    376: #if defined (TIOCLGET)
                    377:   ioctl (tty, TIOCLSET, &local_mode_flags);
                    378: #endif
                    379: 
                    380: #if defined (TIOCSLTC)
                    381:   ioctl (tty, TIOCSLTC, &original_ltchars);
                    382: #endif
                    383: 
                    384: #if defined (TIOCSETC)
                    385:   ioctl (tty, TIOCSETC, &original_tchars);
                    386: #endif
                    387:   terminal_prepped = 0;
                    388: 
                    389: #if defined (HAVE_BSD_SIGNALS)
                    390:   sigsetmask (oldmask);
                    391: #endif
                    392: }
                    393: 
                    394: #else  /* !defined (NEW_TTY_DRIVER) */
                    395: 
                    396: #if !defined (VMIN)
                    397: #define VMIN VEOF
                    398: #endif
                    399: 
                    400: #if !defined (VTIME)
                    401: #define VTIME VEOL
                    402: #endif
                    403: 
                    404: void prep_terminal ()
                    405: {
                    406:   int tty = fileno (stdin);
                    407: #if defined (TERMIOS_TTY_DRIVER)
                    408:   struct termios tio;
                    409: #else
                    410:   struct termio tio;
                    411: #endif /* !TERMIOS_TTY_DRIVER */
                    412: 
                    413: #if defined (HAVE_POSIX_SIGNALS)
                    414:   sigset_t set, oset;
                    415: #else
                    416: #  if defined (HAVE_BSD_SIGNALS)
                    417:   int oldmask;
                    418: #  endif /* HAVE_BSD_SIGNALS */
                    419: #endif /* !HAVE_POSIX_SIGNALS */
                    420: 
                    421:   if (terminal_prepped)
                    422:     return;
                    423: 
                    424:   /* Try to keep this function from being INTerrupted.  We can do it
                    425:      on POSIX and systems with BSD-like signal handling. */
                    426: #if defined (HAVE_POSIX_SIGNALS)
                    427:   sigemptyset (&set);
                    428:   sigemptyset (&oset);
                    429:   sigaddset (&set, SIGINT);
                    430:   sigprocmask (SIG_BLOCK, &set, &oset);
                    431: #else /* !HAVE_POSIX_SIGNALS */
                    432: #  if defined (HAVE_BSD_SIGNALS)
                    433:   oldmask = sigblock (sigmask (SIGINT));
                    434: #  endif /* HAVE_BSD_SIGNALS */
                    435: #endif /* !HAVE_POSIX_SIGNALS */
                    436: 
                    437: #if defined (TERMIOS_TTY_DRIVER)
                    438:   tcgetattr (tty, &tio);
                    439: #else
                    440:   ioctl (tty, TCGETA, &tio);
                    441: #endif /* !TERMIOS_TTY_DRIVER */
                    442: 
                    443:   otio = tio;
                    444: 
                    445:   readline_echoing_p = (tio.c_lflag & ECHO);
                    446: 
                    447:   tio.c_lflag &= ~(ICANON | ECHO);
                    448: 
                    449:   if (otio.c_cc[VEOF] != _POSIX_VDISABLE)
                    450:     eof_char = otio.c_cc[VEOF];
                    451: 
                    452: #if defined (USE_XON_XOFF)
                    453: #if defined (IXANY)
                    454:   tio.c_iflag &= ~(IXON | IXOFF | IXANY);
                    455: #else
                    456:   /* `strict' Posix systems do not define IXANY. */
                    457:   tio.c_iflag &= ~(IXON | IXOFF);
                    458: #endif /* IXANY */
                    459: #endif /* USE_XON_XOFF */
                    460: 
                    461:   /* Only turn this off if we are using all 8 bits. */
                    462:   if ((tio.c_cflag & CSIZE) == CS8)
                    463:     tio.c_iflag &= ~(ISTRIP | INPCK);
                    464: 
                    465:   /* Make sure we differentiate between CR and NL on input. */
                    466:   tio.c_iflag &= ~(ICRNL | INLCR);
                    467: 
                    468: #if !defined (HANDLE_SIGNALS)
                    469:   tio.c_lflag &= ~ISIG;
                    470: #else
                    471:   tio.c_lflag |= ISIG;
                    472: #endif
                    473: 
                    474:   tio.c_cc[VMIN] = 1;
                    475:   tio.c_cc[VTIME] = 0;
                    476: 
                    477:   /* Turn off characters that we need on Posix systems with job control,
                    478:      just to be sure.  This includes ^Y and ^V.  This should not really
                    479:      be necessary.  */
                    480: #if defined (TERMIOS_TTY_DRIVER) && defined (_POSIX_JOB_CONTROL)
                    481: 
                    482: #if defined (VLNEXT)
                    483:   tio.c_cc[VLNEXT] = _POSIX_VDISABLE;
                    484: #endif
                    485: 
                    486: #if defined (VDSUSP)
                    487:   tio.c_cc[VDSUSP] = _POSIX_VDISABLE;
                    488: #endif
                    489: 
                    490: #endif /* POSIX && JOB_CONTROL */
                    491: 
                    492: #if defined (TERMIOS_TTY_DRIVER)
                    493:   tcsetattr (tty, TCSADRAIN, &tio);
                    494:   tcflow (tty, TCOON);         /* Simulate a ^Q. */
                    495: #else
                    496:   ioctl (tty, TCSETAW, &tio);
                    497:   ioctl (tty, TCXONC, 1);      /* Simulate a ^Q. */
                    498: #endif /* !TERMIOS_TTY_DRIVER */
                    499: 
                    500:   terminal_prepped = 1;
                    501: 
                    502: #if defined (HAVE_POSIX_SIGNALS)
                    503:   sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
                    504: #else
                    505: #  if defined (HAVE_BSD_SIGNALS)
                    506:   sigsetmask (oldmask);
                    507: #  endif /* HAVE_BSD_SIGNALS */
                    508: #endif /* !HAVE_POSIX_SIGNALS */
                    509: }
                    510: 
                    511: void deprep_terminal ()
                    512: {
                    513:   int tty = fileno (stdin);
                    514: 
                    515:   /* Try to keep this function from being INTerrupted.  We can do it
                    516:      on POSIX and systems with BSD-like signal handling. */
                    517: #if defined (HAVE_POSIX_SIGNALS)
                    518:   sigset_t set, oset;
                    519: #else /* !HAVE_POSIX_SIGNALS */
                    520: #  if defined (HAVE_BSD_SIGNALS)
                    521:   int oldmask;
                    522: #  endif /* HAVE_BSD_SIGNALS */
                    523: #endif /* !HAVE_POSIX_SIGNALS */
                    524: 
                    525:   if (!terminal_prepped)
                    526:     return;
                    527: 
                    528: #if defined (HAVE_POSIX_SIGNALS)
                    529:   sigemptyset (&set);
                    530:   sigemptyset (&oset);
                    531:   sigaddset (&set, SIGINT);
                    532:   sigprocmask (SIG_BLOCK, &set, &oset);
                    533: #else /* !HAVE_POSIX_SIGNALS */
                    534: #  if defined (HAVE_BSD_SIGNALS)
                    535:   oldmask = sigblock (sigmask (SIGINT));
                    536: #  endif /* HAVE_BSD_SIGNALS */
                    537: #endif /* !HAVE_POSIX_SIGNALS */
                    538: 
                    539: #if defined (TERMIOS_TTY_DRIVER)
                    540:   tcsetattr (tty, TCSADRAIN, &otio);
                    541:   tcflow (tty, TCOON);         /* Simulate a ^Q. */
                    542: #else /* TERMIOS_TTY_DRIVER */
                    543:   ioctl (tty, TCSETAW, &otio);
                    544:   ioctl (tty, TCXONC, 1);      /* Simulate a ^Q. */
                    545: #endif /* !TERMIOS_TTY_DRIVER */
                    546: 
                    547:   terminal_prepped = 0;
                    548: 
                    549: #if defined (HAVE_POSIX_SIGNALS)
                    550:   sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
                    551: #else /* !HAVE_POSIX_SIGNALS */
                    552: #  if defined (HAVE_BSD_SIGNALS)
                    553:   sigsetmask (oldmask);
                    554: #  endif /* HAVE_BSD_SIGNALS */
                    555: #endif /* !HAVE_POSIX_SIGNALS */
                    556: }
                    557: #endif  /* NEW_TTY_DRIVER */
                    558: 
                    559: /* If a character is available to be read, then read it
                    560:    and stuff it into IBUFFER.  Otherwise, just return. */
                    561: 
                    562: long pending = -1L;
                    563: 
                    564: long key_avail (stream)
                    565:        FILE *stream;
                    566: {
                    567:   int tty = fileno (stream);
                    568:   long chars_avail = pending;
                    569:   int result;
                    570: 
                    571: #if defined (FIONREAD)
                    572:   result = ioctl (tty, FIONREAD, &chars_avail);
                    573: #endif
                    574: 
                    575:   if(chars_avail == -1L)
                    576:     {  unsigned char inchar;
                    577: 
                    578:        fcntl(tty, F_SETFL, O_NDELAY);
                    579:        result = read(tty, &inchar, sizeof(char));
                    580:        if(result == sizeof(char))
                    581:        {
                    582:          chars_avail = 1;
                    583:          pending = (long)inchar;
                    584:        }
                    585:        else
                    586:          chars_avail = 0;
                    587:        fcntl(tty, F_SETFL, 0);
                    588:     }
                    589: 
                    590:   return chars_avail;
                    591: }
                    592: 
                    593: /* Get a key from the buffer of characters to be read.
                    594:    Return the key in KEY.
                    595:    Result is KEY if there was a key, or 0 if there wasn't. */
                    596: 
                    597: /* When compiling and running in the `Posix' environment, Ultrix does
                    598:    not restart system calls, so this needs to do it. */
                    599: 
                    600: unsigned char getkey(stream)
                    601:      FILE *stream;
                    602: {
                    603:   int result;
                    604:   unsigned char c;
                    605: 
                    606:   while (pending < 0)
                    607:     {
                    608:       result = read (fileno (stream), &c, sizeof (char));
                    609: 
                    610:       if (result == sizeof (char))
                    611:         return /* (c == 0x7F ? 0x08 :*/ c /*)*/;
                    612: 
                    613:       /* If zero characters are returned, then the file that we are
                    614:         reading from is empty!  Return EOF in that case. */
                    615:       if (result == 0)
                    616:        return (0);
                    617: 
                    618:       /* If the error that we received was SIGINT, then try again,
                    619:         this is simply an interrupted system call to read ().
                    620:         Otherwise, some error ocurred, also signifying EOF. */
                    621:       if (errno != EINTR)
                    622:        return (EOF);
                    623:     }
                    624: 
                    625:   result = (int) pending;
                    626:   pending = -1L;
                    627: 
                    628:   return result;
                    629: }
                    630: 
                    631: #ifdef TEST
                    632: 
                    633: #include <time.h>
                    634: 
                    635: int timewait=100000;
                    636: 
                    637: int main()
                    638: {
                    639:        unsigned char c;
                    640: 
                    641:        prep_terminal();
                    642: 
                    643:        do
                    644:        {
                    645:                int i=0;
                    646: 
                    647:                while(!key_avail(stdin))
                    648:                {
                    649:                        printf("%04d",i);
                    650:                        fflush(stdout);
                    651:                        {
                    652:                                struct timeval timeout;
                    653:                                timeout.tv_sec=timewait/1000000;
                    654:                                timeout.tv_usec=timewait%1000000;
                    655:                                (void)select(0,0,0,0,&timeout);
                    656:                        }
                    657:                        i++;
                    658:                        printf("\b\b\b\b");
                    659:                        fflush(stdout);
                    660:                }
                    661:                c = getkey(stdin);
                    662:                printf("%02x,",(int)c);
                    663:                fflush(stdout);
                    664:        }       while(c != 0x1B);
                    665: 
                    666:        deprep_terminal();
                    667:        puts("");
                    668: }
                    669: #endif
                    670: 
                    671: /* signal handling taken from pfe by Dirk Zoller (Copylefted) - anton */
                    672: /* !! needs cleanup */
                    673: char *
                    674: sigmsg (int sig)
                    675: {
                    676:        static char buf [25];
                    677:        static char *msg [] =
                    678:        {
                    679:                "Hangup",       /* These strings are cited from */
                    680:                "Interrupt",    /* Rochkind: Advanced UNIX programming */
                    681:                "Quit",
                    682:                "Illegal Instruction",
                    683:                "Trace Trap",
                    684:                "IOT instruction",
                    685:                "EMT instruction",
                    686:                "Floating point exception",
                    687:                "Kill",
                    688:                "Bus error",
                    689:                "Segmentation Violation",
                    690:                "Bad arg to system call",
                    691:                "Broken pipe",
                    692:                "Alarm clock",
                    693:                "Terminate signal",
                    694:                "User signal 1",
                    695:                "User signal 2",
                    696:        };
                    697: 
                    698:        if ((unsigned)sig <= 17)
                    699:                return msg [sig - 1];
                    700:        sprintf (buf, "signal %d received", sig);
                    701:        return buf;
                    702: }
                    703: 
                    704: static void
                    705: graceful_exit (int sig)
                    706: {
                    707:   deprep_terminal();
                    708:   if ((unsigned)sig <= 17)
                    709:     fprintf (stderr, "\n\n%s.\n", sigmsg (sig));
                    710:   else
                    711:     fprintf (stderr, "\n\nSignal %d received, terminated.\n", sig);
1.4     ! anton     712:   exit (0x80|sig);
1.1       anton     713: }
                    714: 
1.4     ! anton     715: jmp_buf throw_jmp_buf;
        !           716: 
        !           717: static void 
        !           718: signal_throw(int sig)
        !           719: {
        !           720:   static int throw_codes[] = {
        !           721:     -256,
        !           722:     -28,
        !           723:     -257,
        !           724:     -258,
        !           725:     -259,
        !           726:     -260,
        !           727:     -261,
        !           728:     -55,
        !           729:     -262,
        !           730:     -23,
        !           731:     -9,
        !           732:     -263,
        !           733:     -264,
        !           734:     -265,
        !           735:     -266,
        !           736:     -267,
        !           737:     -268,
        !           738:   };
        !           739:   signal(sig,signal_throw);
        !           740:   longjmp(throw_jmp_buf,throw_codes[sig-1]); /* or use siglongjmp ? */
        !           741: }
        !           742: 
1.1       anton     743: void
                    744: install_signal_handlers (void)
                    745: {
                    746: /* !! These definitions seem to be system dependent
                    747:    We could have them in the machine.h file,
                    748:    but I would like something more automatic - anton */
                    749: #define SIGS_TO_IGNORE SIGCHLD
                    750: #define SIGS_TO_ABORT  SIGINT, SIGILL, SIGFPE, SIGUSR1, SIGSEGV, SIGUSR2, \
1.3       anton     751:                        SIGALRM,  SIGBUS
1.1       anton     752: #define SIGS_TO_QUIT   SIGHUP, SIGQUIT, SIGABRT, SIGPIPE, \
                    753:                        SIGTERM 
                    754: 
                    755:   static short sigs_to_ignore [] = { SIGS_TO_IGNORE };
                    756:   static short sigs_to_abort [] = { SIGS_TO_ABORT };
                    757:   static short sigs_to_quit [] = { SIGS_TO_QUIT };
                    758:   int i;
                    759: 
                    760: #define DIM(X)         (sizeof (X) / sizeof *(X))
                    761:   for (i = 0; i < DIM (sigs_to_ignore); i++)
                    762:     if (sigs_to_ignore [i])
                    763:       signal (sigs_to_ignore [i], SIG_IGN);
                    764:   for (i = 0; i < DIM (sigs_to_abort); i++)
1.4     ! anton     765:     signal (sigs_to_abort [i], signal_throw); /* !! change to throw */
1.1       anton     766:   for (i = 0; i < DIM (sigs_to_quit); i++)
                    767:     signal (sigs_to_quit [i], graceful_exit);
                    768: }
                    769: /* end signal handling */

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