/* 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 #include 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 #include #include #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 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 */