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/* mftalk.c -- generic Metafont window server.
Copyright (C) 1994 Ralph Schleicher
Slightly modified for Web2c 7.0 by Karl Berry.
Further modifications for Web2C 7.2 by Mathias.Herberts@irisa.fr */
/* This library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Please remember the following for porting to UNIX:
pid = fork ();
if (pid == 0)
execve (...); pid = spawnve (mode, ...);
else if (pid == -1) if (pid == -1)
error (); error ();
else else
success (); success ();
Spawnve(2) has many different modes and a `session' is indicated by
running on an extra terminal. */
#define EXTERN extern
#include "../mfd.h"
#ifdef MFTALKWIN
#undef input
#undef output
#undef read
#undef write
#ifdef OS2
#include <sys/param.h>
#include <process.h>
extern int close (int);
extern int pipe (int *);
extern int read (int, void *, size_t);
extern int setmode (int, int);
extern int write (int, const void *, size_t);
#endif
#include <fcntl.h>
#include <signal.h>
#include <kpathsea/variable.h>
#include "mftalk.h"
/* We use SIGCHLD, but fall back on SIGCLD if that's all we have. */
#if !defined (SIGCHLD) && defined (SIGCLD)
#define SIGCHLD SIGCLD
#endif
#define fatal(func, cond) do { if (cond) FATAL_PERROR ("perror"); } while (0)
static RETSIGTYPE child_died (int sig);
static string app_type (char *prog, int *app);
static int pid = -1; /* Process ID of our child. */
static int win = -1; /* Write handle to the `window'. */
static int buf[8]; /* Temporary buffer. */
static RETSIGTYPE (*old) (); /* Old signal handler. */
#include <mfdisplay.h>
int
mf_mftalk_initscreen (void)
{
int app; /* Client application type. */
char *prog, *name; /* Client program name. */
/* Size of METAFONT window. */
char height[MAX_INT_LENGTH], width[MAX_INT_LENGTH];
/* Inherited pipe handles. */
char input[MAX_INT_LENGTH], output[MAX_INT_LENGTH];
char parent[MAX_INT_LENGTH]; /* My own process ID. */
int sc_pipe[2]; /* Server->Client pipe. */
int cs_pipe[2]; /* Client->Server pipe. */
int res, ack; /* Wait until child is ready. */
prog = kpse_var_value ("MFTALK");
if (prog == NULL)
prog = "mftalk.exe";
name = app_type (prog, &app);
if (!name)
return 0;
if (pipe (sc_pipe) == -1)
return 0;
if (pipe (cs_pipe) == -1)
{
close (sc_pipe[0]);
close (sc_pipe[1]);
return 0;
}
#ifdef OS2
fatal (setmode, setmode (sc_pipe[0], O_BINARY) == -1);
fatal (setmode, setmode (sc_pipe[1], O_BINARY) == -1);
fatal (setmode, setmode (cs_pipe[0], O_BINARY) == -1);
fatal (setmode, setmode (cs_pipe[1], O_BINARY) == -1);
#endif
old = signal (SIGCHLD, child_died);
fatal (old, old == SIG_ERR);
sprintf (height, "-h%d", screendepth);
sprintf (width, "-w%d", screenwidth);
sprintf (input, "-i%d", sc_pipe[0]);
sprintf (output, "-o%d", cs_pipe[1]);
sprintf (parent, "-p%d", getpid ());
#ifdef OS2
pid = spawnl (app, name, prog, height, width, input, output, parent, NULL);
#else
pid = fork ();
if (pid == 0)
{
fatal (close, close (0) == -1);
fatal (dup, dup (sc_pipe[0]) != 0);
fatal (close, close (sc_pipe[0]) == -1);
fatal (close, close (sc_pipe[1]) == -1);
fatal (close, close (1) == -1);
fatal (dup, dup (cs_pipe[1]) != 1);
fatal (close, close (cs_pipe[0]) == -1);
fatal (close, close (cs_pipe[1]) == -1);
/* We still pass the file handles as parameters for
* backward compatibility. instead of sc_pipe[0] and
* cs_pipe[1] we just pass 0 (stdin) and 1 (stdout).
*/
sprintf (input, "-i0");
sprintf (output, "-o1");
execl (name, prog, height, width, input, output, parent, NULL);
}
#endif /* not OS2 */
switch (pid)
{
case -1:
failure:
fatal (close, close (sc_pipe[0]) == -1);
fatal (close, close (sc_pipe[1]) == -1);
fatal (close, close (cs_pipe[0]) == -1);
fatal (close, close (cs_pipe[1]) == -1);
fatal (signal, signal (SIGCHLD, old) == SIG_ERR);
break;
default:
res = read (cs_pipe[0], &ack, sizeof (int));
if (res != sizeof (int) || ack != MF_ACK)
goto failure;
fatal (close, close (cs_pipe[0]) == -1);
win = sc_pipe[1];
break;
}
return (win == -1) ? 0 : 1;
}
void
mf_mftalk_updatescreen (void)
{
buf[0] = MF_FLUSH;
write (win, buf, sizeof (int));
}
void
mf_mftalk_blankrectangle (screencol left,
screencol right,
screenrow top,
screenrow bottom)
{
buf[0] = MF_RECT;
buf[1] = MF_WHITE;
buf[2] = left;
buf[3] = bottom;
buf[4] = right;
buf[5] = top;
write (win, buf, 6 * sizeof (int));
}
void
mf_mftalk_paintrow (screenrow row,
pixelcolor init_color,
transspec transition_vector,
screencol vector_size)
{
buf[0] = MF_LINE;
buf[1] = init_color == 0 ? MF_WHITE : MF_BLACK;
buf[2] = *transition_vector++;
buf[3] = row;
buf[4] = --vector_size;
write (win, buf, 5 * sizeof (int));
write (win, transition_vector, vector_size * sizeof (int));
}
static string
app_type (string prog, int *app)
{
#ifdef OS2
int res, app;
res = DosSearchPath (0x02 | 0x01, "PATH", prog, buf, len);
if (res != 0)
return -1;
res = DosQueryAppType (buf, &app);
if (res != 0)
return -1;
switch (app & 0x07) /* Quick guess. */
{
case 0x00: return (P_SESSION | P_DEFAULT);
case 0x01: return (P_SESSION | P_FULLSCREEN);
case 0x02: return (P_SESSION | P_WINDOWED);
case 0x03: return (P_PM);
}
#endif /* OS2 */
*app = 0; /* Irrelevant. */
return prog;
}
static RETSIGTYPE
child_died (int sig)
{
#ifdef OS2
fatal (signal, signal (sig, SIG_ACK) == SIG_ERR);
#endif
fatal (signal, signal (sig, SIG_IGN) == SIG_ERR);
if (pid == -1 || kill (-pid, 0) == 0) /* This was not our child. */
{
if (old != SIG_IGN)
{
fatal (signal, signal (sig, old) == SIG_ERR);
fatal (raise, raise (sig) == -1);
}
fatal (signal, signal (sig, child_died) == SIG_ERR);
}
else
{
close (win); /* This may fail. */
win = -1;
pid = -1;
screenstarted = false; /* METAFONT variables. */
screenOK = false;
fatal (signal, signal (sig, old) == SIG_ERR);
}
}
#else /* !MFTALKWIN */
int mftalk_dummy;
#endif /* !MFTALKWIN */
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