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/* unixio.c - Unix terminal and signal handling
$Id: unixio.c,v 0.2 1997/03/28 03:17:33 tjchol01 Exp $
Authors: Andrew Trevorrow, Ian Dall, Geoffrey Tobin, Tomasz J. Cholewo
*/
#include "dvgt.h"
#include "unixio.h"
#include "screenio.h" /* for MesgString, MesgLine */
/* Set DV_FD (ioctl file descriptor) to 0 or 1 ? */
#define DV_FD STDIN_FILENO
sig_flags_t sig_flags;
cmode_flags_t cmode_flags;
/* Alex Dickinson
Procedures for setting and resetting UNIX tty characteristics.
Interesting functions are:
save_init_tty;
restore_init_tty;
save_temp_tty;
restore_temp_tty;
echoon;
echooff;
singlecharon;
singlecharoff;
buffercount;
suspend;
A side effect of calling save_temp_tty is to set up signal handling
to reset the terminal characteristics appropriately for the various
interrupt signals.
*/
/*****************************************************************
* terminal handling
*/
#if defined(HAVE_TERMIO_H)
#include <fcntl.h>
#include <termio.h>
#define TERMIO
#ifdef NCC
#define MAXCC NCC
#else
#define MAXCC 256
#endif
#define DV_GTTY TCGETA
#define DV_STTY TCSETAW
typedef struct termio dv_tty;
unsigned char saved_cc[NCC];
#else
#include <sgtty.h>
#define DV_GTTY TIOCGETP
#define DV_STTY TIOCSETN
typedef struct sgttyb dv_tty;
#endif /* TERMIOS || TERMIO */
#include <signal.h>
#include <errno.h>
static dv_tty init_tty_state; /* store initial terminal characteristics */
static dv_tty temp_tty_state; /* current terminal characteristics */
/* locally defined and used functions and data */
static void setsignals ();
static void reportio PARAMS ((int iostat));
static int iostatus; /* return status of ioctl system function */
static void
reportio (int iostat)
{
if (iostat < 0)
{ /* an ioctl error */
char *str = "";
String cstr;
switch (errno)
{
/* generic errors */
#ifdef EBADF
case EBADF:
str = "Not a valid, open, file descriptor!";
break;
#endif
#ifdef EINTR
case EINTR:
str = "Signal caught.";
break;
#endif
#ifdef ENOTTY
case ENOTTY:
str = "No device driver, or doesn't accept control functions!";
break;
#endif
/* specialised errors */
#ifdef EFAULT
case EFAULT:
str = "Illegal data transfer address!";
break;
#endif
#ifdef EINVAL
case EINVAL:
str = "Driver ignorant of this request or arg!";
break;
#endif
#ifdef EIO
case EIO:
str = "Physical I/O error!";
break;
#endif
#ifdef ENOLINK
case ENOLINK:
str = "Remote machine link no longer active!";
break;
#endif
#ifdef ENXIO
case ENXIO:
str = "Subdevice cannot perform requested service!";
break;
#endif
/* gt - should be ample space in cstr. */
default:
sprintf (cstr, "Unknown error %d !", errno);
str = cstr;
break;
}
MesgString ("ioctl: ");
MesgString (str);
MesgLine ();
}
} /* reportio */
void
save_init_tty ()
{
/* Save the original tty characteristics and set up the signalling. */
save_temp_tty ();
init_tty_state = temp_tty_state;
} /* save_init_tty */
void
restore_init_tty ()
{
/* Restore the original tty characteristics. */
temp_tty_state = init_tty_state;
restore_temp_tty ();
} /* restore_init_tty */
void
save_temp_tty ()
{
/* Save the current tty characteristics and set up the signalling. */
iostatus = ioctl (DV_FD, DV_GTTY, &temp_tty_state);
reportio (iostatus);
setsignals ();
} /* save_temp_tty */
void
restore_temp_tty ()
{
/* Restore the recent tty characteristics. */
iostatus = ioctl (DV_FD, DV_STTY, &temp_tty_state);
reportio (iostatus);
} /* restore_temp_tty */
void
singlecharon ()
{
/* Set driver to read characters as they are typed without waiting for a
terminator. Echo remains unchanged. */
dv_tty s;
if (cmode_flags.cbreak != 1)
{
reportio (ioctl (DV_FD, DV_GTTY, &s));
#ifndef TERMIO
s.sg_flags |= CBREAK;
#else /* TERMIO */
saved_cc[VEOL] = s.c_cc[VEOL];
saved_cc[VEOF] = s.c_cc[VEOF];
s.c_lflag &= ~ICANON; /* Disable erase/kill processing */
s.c_cc[VMIN] = 1; /* Input should wait for at least 1 char */
s.c_cc[VTIME] = 0; /* no matter how long that takes. */
#endif /* TERMIO */
reportio (ioctl (DV_FD, DV_STTY, &s));
#ifdef FLUSH_STDIN
fflush (stdin);
#endif /* FLUSH_STDIN */
cmode_flags.cbreak = 1;
}
} /* singlecharon */
void
singlecharoff ()
{
/* Turn off single character read mode. */
dv_tty s;
if (cmode_flags.cbreak != 0)
{
iostatus = ioctl (DV_FD, DV_GTTY, &s);
reportio (iostatus);
#ifndef TERMIO
s.sg_flags &= ~CBREAK;
#else /* TERMIO */
s.c_lflag |= ICANON; /* Enable erase/kill processing */
s.c_cc[VEOL] = saved_cc[VEOL];
s.c_cc[VEOF] = saved_cc[VEOF];
#endif /* TERMIO */
iostatus = ioctl (DV_FD, DV_STTY, &s);
reportio (iostatus);
cmode_flags.cbreak = 0;
}
} /* singlecharoff */
void
echoon ()
{
/* Turn character echoing on. */
dv_tty s;
reportio (ioctl (DV_FD, DV_GTTY, &s));
#ifndef TERMIO
s.sg_flags |= ECHO;
#else /* TERMIO */
s.c_lflag |= ECHO;
#endif /* TERMIO */
reportio (ioctl (DV_FD, DV_STTY, &s));
cmode_flags.echo = 1;
} /* echoon */
void
echooff ()
{
/* Turn character echoing off. */
dv_tty s;
iostatus = ioctl (DV_FD, DV_GTTY, &s);
reportio (iostatus);
#ifndef TERMIO
s.sg_flags &= ~ECHO;
#else /* TERMIO */
s.c_lflag &= ~ECHO;
#endif /* TERMIO */
iostatus = ioctl (DV_FD, DV_STTY, &s);
reportio (iostatus);
cmode_flags.echo = 0;
} /* echooff */
void
rawouton ()
{
dv_tty s;
iostatus = ioctl (DV_FD, DV_GTTY, &s);
reportio (iostatus);
#ifdef TERMIO
s.c_oflag &= ~OPOST; /* Disables tab interpretation etc. */
#endif /* TERMIO */
iostatus = ioctl (DV_FD, DV_STTY, &s);
reportio (iostatus);
cmode_flags.raw = 1;
} /* rawouton */
void
rawoutoff ()
{
dv_tty s;
iostatus = ioctl (DV_FD, DV_GTTY, &s);
reportio (iostatus);
#ifdef TERMIO /* TERMIO */
s.c_oflag |= OPOST;
#endif /* TERMIO */
iostatus = ioctl (DV_FD, DV_STTY, &s);
reportio (iostatus);
cmode_flags.raw = 0;
} /* rawoutoff */
int
buffercount ()
{
/* Return true if there are any characters currently in the input buffer. */
#ifndef TERMIO
long count;
iostatus = ioctl (DV_FD, FIONREAD, &count);
reportio (iostatus);
return (count > 0);
#else /* TERMIO */
int c, flags, ret;
/* Save the current fcntl flags and make reads return without waiting */
flags = fcntl (0, F_GETFL, 0);
fcntl (0, F_SETFL, flags | O_NDELAY); /* This might be SysV specific */
if ((c = getchar ()) != EOF)
{
ungetc (c, stdin);
ret = 1;
}
else
{
ret = 0;
}
fcntl (0, F_SETFL, flags); /* This might be SysV specific */
return ret;
#endif /* TERMIO */
} /* buffercount */
RETSIGTYPE
handleint (int sig)
{
/* Catch signals from tty.
If sig is an interrupt, set the intr flag,
Otherwise it was a suspend, so set the tstop flag. */
fflush (stdin);
if (sig == SIGINT)
{
sig_flags.intr = 1;
}
else
{
sig_flags.tstop = 1;
}
#ifdef TERMIO /* TERMIO */
setsignals (); /* Because SysV forgets its handlers */
#endif /* TERMIO */
} /* handleint */
static void
setsignals ()
{
/* Signal initialization. */
signal (SIGINT, handleint);
#ifndef TERMIO
signal (SIGTSTP, handleint);
#endif /* TERMIO */
} /* setsignals */
void
suspend ()
{
/* Suspend the process */
#ifndef TERMIO
signal (SIGTSTP, SIG_DFL);
kill (0, SIGTSTP);
/* resumed again, goody! */
setsignals ();
#else
/* don't know what to do */
#endif /* TERMIO */
} /* suspend */
#undef IN_UNIXIO_C
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