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730ff30b86
Update files that depend on unixfork functions to include unixfork.h Declare as static all functions in unixfork.c that are not needed externally. Add dependencies to makefile-tail. modified: makefile-tail new file: ../inc/unixfork.h modified: ../src/ldeboot.c modified: ../src/main.c modified: ../src/unixfork.c
679 lines
19 KiB
C
679 lines
19 KiB
C
/* $Id: unixfork.c,v 1.6 2001/12/26 22:17:05 sybalsky Exp $ (C) Copyright Venue, All Rights Reserved
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*/
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static char *id = "$Id: unixfork.c,v 1.6 2001/12/26 22:17:05 sybalsky Exp $ Copyright (C) Venue";
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/************************************************************************/
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/* */
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/* Code to fork a subprocess for Unix communication */
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/* */
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/* */
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/* */
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/************************************************************************/
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/************************************************************************/
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/* */
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/* (C) Copyright 1989-1998 Venue. All Rights Reserved. */
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/* Manufactured in the United States of America. */
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/* */
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/* The contents of this file are proprietary information */
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/* belonging to Venue, and are provided to you under license. */
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/* They may not be further distributed or disclosed to third */
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/* parties without the specific permission of Venue. */
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/* */
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/************************************************************************/
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#include "version.h"
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#include <stdlib.h>
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#include <string.h>
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#ifdef OS4
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#define USETERMIOS
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#endif
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#ifdef OS5
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#define USETERMIOS
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#include <sys/stropts.h>
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#define FULLSLAVENAME
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#endif
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#ifdef INDIGO
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#define USETERMIOS
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#define TCSETS TCSETA
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#define TCGETS TCGETA
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#define FULLSLAVENAME
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#endif
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#include <sys/ioctl.h>
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#ifndef USETERMIOS
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#include <sys/ioctl.h>
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#else
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#if defined(INDIGO) || defined(MACOSX) || defined(FREEBSD)
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#include <termios.h>
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#else
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#include <sys/termios.h>
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#endif /* INDIGO */
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#endif /* USETERMIOS */
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#ifdef OSF1
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#define _CLOCK_ID_T
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typedef int clockid_t;
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#include "time.h"
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#include <sys/resource.h>
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#endif /* OSF1 */
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#ifdef HPUX
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#include <sgtty.h>
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#include <unistd.h>
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#endif /* HPUX */
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#ifdef SYSVONLY
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#include <fcntl.h>
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#include <unistd.h>
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#endif /* SYSVONLY */
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/file.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include "dbprint.h"
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#include <sys/socket.h>
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#include <sys/un.h>
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#ifdef RISCOS
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/* #include <sys/un.h> */
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#include <sgtty.h>
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#endif /* RISCOS */
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#ifdef INDIGO
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/* #include <sys/un.h> */
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#include <sgtty.h>
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#endif
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#include "unixfork.h"
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/* The following globals are used to communicate between Unix
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subprocesses and LISP */
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long StartTime; /* Time, for creating pipe filenames */
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char shcom[512]; /* Here because I'm suspicious of */
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/* large allocations on the stack */
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static __inline__ int
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SAFEREAD(int f, char *b, int c)
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{
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int res;
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loop:
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res = read(f, b, c);
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if ((res < 0)) {
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if (errno == EINTR || errno == EAGAIN) goto loop;
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perror("reading UnixPipeIn");
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}
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return (res);
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}
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/************************************************************************/
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/* */
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/* F o r k U n i x S h e l l */
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/* */
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/* Fork a PTY connection to a C-shell process. */
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/* Returns PID of process, or -1 if something failed */
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/* */
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/* */
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/************************************************************************/
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/* Creates a PTY connection to a csh */
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#ifdef FULLSLAVENAME
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int ForkUnixShell(int slot, char *PtySlave, char *termtype, char *shellarg)
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#else
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int ForkUnixShell(int slot, char ltr, char numb, char *termtype, char *shellarg)
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#endif
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{
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#ifdef FULLSLAVENAME
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char buf[1];
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#else
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char PtySlave[20], buf[1];
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#endif
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int res, PID, MasterFD, SlaveFD;
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#ifdef USETERMIOS
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struct termios tio;
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#else
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struct sgttyb tio;
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#endif /* USETERMIOS */
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PID = fork();
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if (PID == 0) {
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char envstring[64];
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char *argvec[4];
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#ifndef SYSVONLY
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/* Divorce ourselves from /dev/tty */
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res = open("/dev/tty", O_RDWR);
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if (res >= 0) {
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(void)ioctl(res, TIOCNOTTY, (char *)0);
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(void)close(res);
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} else {
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perror("Slave TTY");
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exit(0);
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}
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#else
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if (0 > setsid()) /* create us a new session for tty purposes */
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perror("setsid");
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#endif
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/* Open the slave side */
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#ifndef FULLSLAVENAME
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sprintf(PtySlave, "/dev/tty%c%c", ltr, numb);
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#endif
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SlaveFD = open(PtySlave, O_RDWR);
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if (SlaveFD == -1) {
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perror("Slave Open");
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perror(PtySlave);
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exit(0);
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}
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#ifdef OS5
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ioctl(SlaveFD, I_PUSH, "ptem");
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ioctl(SlaveFD, I_PUSH, "ldterm");
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#endif /* OS5 */
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#ifndef USETERMIOS
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/* This is the old way we set up terminal (OS 3), using an
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obsolete ioctl and wrong flags for a display. */
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ioctl(SlaveFD, TIOCGETP, (char *)&tio);
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tio.sg_flags |= CRMOD;
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tio.sg_flags |= ECHO;
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ioctl(SlaveFD, TIOCSETP, (char *)&tio);
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#else
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/* Set up as basic display terminal: canonical erase,
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kill processing, echo, backspace to erase, echo ctrl
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chars as ^x, kill line by backspacing */
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#if defined(MACOSX) || defined(FREEBSD)
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tcgetattr(SlaveFD, &tio);
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#else
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ioctl(SlaveFD, TCGETS, (char *)&tio);
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#endif
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#ifdef INDIGO
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tio.c_lflag |= ICANON | ECHO | ECHOE;
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#else
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tio.c_lflag |= ICANON | ECHO | ECHOE | ECHOCTL | ECHOKE;
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#endif /* INDIGO */
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#if defined(MACOSX) || defined(FREEBSD)
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tcsetattr(SlaveFD, TCSANOW, &tio);
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#else
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ioctl(SlaveFD, TCSETS, (char *)&tio);
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#endif
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#endif /* USETERMIOS */
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(void)dup2(SlaveFD, 0);
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(void)dup2(SlaveFD, 1);
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(void)dup2(SlaveFD, 2);
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(void)close(SlaveFD);
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/* set the LDESHELL variable so the underlying .cshrc can see it and
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configure the shell appropriately, though this may not be so important any more */
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putenv("LDESHELL=YES");
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if ((termtype[0] != 0) && (strlen(termtype) < 59)) { /* set the TERM environment var */
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sprintf(envstring, "TERM=%s", termtype);
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putenv(envstring);
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}
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/* Start up csh */
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argvec[0] = "csh";
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if (shellarg[0] != 0) { /* setup to run command */
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argvec[1] = "-c"; /* read commands from next arg */
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argvec[2] = shellarg;
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argvec[3] = (char *)0;
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} else
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argvec[1] = (char *)0;
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execv("/bin/csh", argvec);
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/* Should never get here */
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perror("execv");
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exit(0);
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} else { /* not the forked process. */
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if (shellarg != shcom) free(shellarg);
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}
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/* Set the process group so all the kids get the bullet too
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if (setpgrp(PID, PID) != 0)
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perror("setpgrp"); */
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return (PID);
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}
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/* fork_Unix is the secondary process spawned right after LISP is
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started, to avoid having TWO 8 mbyte images sitting around. It listens
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to the pipe LispToUnix waiting for requests, and responds on UnixToLisp.
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The data passed through this pipe is in 4 byte packets, of the form:
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Byte 0: Command character, one of:
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S: Fork PTY (shell) process. This is used for CHAT windows.
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P: New version of S, takes 2 string args.
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F: Fork piped shell, takes 1 string arg.
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K: Kill process
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E: Exit (kill all subprocesses)
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C: Close stdin to subprocess
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W: call WAIT3 & get one process's close info.
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O: Fork OCR process.
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Byte 1: Process number (0 to NPROCS - 1)
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Not used for S, F, and E commands
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[For S&P, pty letter]
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[For F, process # for pipe naming]
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Byte 2: Value, used as follows:
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Only used for W command, contains byte to write
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[For S&P, pty number]
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Byte 3: Slot number.
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In the case of F & P commands, additional data follows the 4 byte packet.
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This consists of 2 bytes representing the length of the shell command
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string, and the string itself.
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fork_Unix will return another 4 byte packet. The bytes are the same as those
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of the packet received except:
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F: Byte 2 is job number
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Byte 3 is 1 if successful, 0 if not
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S: Byte 2 is job number
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Byte 3 is 1 if successful, 0 if not
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R: Byte 2 is value of byte read from stdin, if any
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Byte 3 is 1 if successful, 2 if EOF, 0 if nothing waiting
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W: Bytes 0 & 1 are the Process ID of the terminated process
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Bytes 2 & 3 are the high & low bytes of the exit status.
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K: Bytes 1 and 2 are the high and low bytes of the exit status
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of the process.
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Byte 3 is 1 if an exit status was available.
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E: Always the same
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C: Always the same
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O: Byte 3 is 1 if successful, 0 if not
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Byte 1 and Byte 2 are the process ID of OCR process
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*/
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long time(long); /* XXX where does time come from? */
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int fork_Unix() {
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int LispToUnix[2], /* Incoming pipe from LISP */
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UnixToLisp[2], /* Outgoing pipe to LISP */
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UnixPID, LispPipeIn, LispPipeOut, res, slot;
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pid_t pid;
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char IOBuf[4];
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unsigned short tmp;
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char *cmdstring;
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/* Pipes between LISP subr and process */
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if (pipe(LispToUnix) == -1) {
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perror("pipe");
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exit(-1);
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}
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if (pipe(UnixToLisp) == -1) {
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perror("pipe");
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exit(-1);
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}
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StartTime = time(0); /* Save the time, to create filenames with */
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StartTime &= 0xFFFFFF; /* as a positive number! */
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/* interrupts need to be blocked here so subprocess won't see them */
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#ifdef SYSVSIGNALS
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sighold(SIGVTALRM);
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sighold(SIGIO);
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sighold(SIGALRM);
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sighold(SIGXFSZ);
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sighold(SIGFPE);
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#else
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sigblock(sigmask(SIGVTALRM) | sigmask(SIGIO) | sigmask(SIGALRM)
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#ifndef HPUX
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| sigmask(SIGXFSZ)
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#endif /* HPUX */
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| sigmask(SIGFPE));
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#endif /* SYSVSIGNALS */
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if ((UnixPID = fork()) == -1) { /* Fork off small version of the emulator */
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perror("fork");
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exit(-1);
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}
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if (UnixPID != 0) {
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/* JRB - fork_Unix is now called in ldeboot; leave UnixPipe{In,Out} open
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and put their numbers in the environment so parent can find them */
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/* JDS - NB that sprintf doesn't always return a string! */
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char *tempstring;
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tempstring = (char *)malloc(30);
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sprintf(tempstring, "LDEPIPEIN=%d", UnixToLisp[0]);
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putenv(tempstring);
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tempstring = (char *)malloc(30);
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sprintf(tempstring, "LDEPIPEOUT=%d", LispToUnix[1]);
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putenv(tempstring);
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tempstring = (char *)malloc(30);
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sprintf(tempstring, "LDESTARTTIME=%ld", StartTime);
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putenv(tempstring);
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tempstring = (char *)malloc(30);
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sprintf(tempstring, "LDEUNIXPID=%d", UnixPID);
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putenv(tempstring);
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close(LispToUnix[0]);
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close(UnixToLisp[1]);
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return (1);
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}
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LispPipeIn = LispToUnix[0];
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LispPipeOut = UnixToLisp[1];
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close(LispToUnix[1]);
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close(UnixToLisp[0]);
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res = fcntl(LispPipeIn, F_GETFL, 0);
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res &= (65535 - FNDELAY);
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res = fcntl(LispPipeIn, F_SETFL, res);
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while (1) {
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int len;
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len = 0;
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while (len != 4) {
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if ((len = SAFEREAD(LispPipeIn, IOBuf, 4)) < 0) { /* Get packet */
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perror("Packet read by slave");
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/* kill_comm_processes(); */
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exit(0);
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}
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if (len != 4) {
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DBPRINT(("Input packet wrong length: %d.\n", len));
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exit(0);
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}
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}
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slot = IOBuf[3];
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IOBuf[3] = 1; /* Start by signalling success in return-code */
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switch (IOBuf[0]) {
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case 'S':
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case 'P': /* Fork PTY shell */
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if (slot >= 0) { /* Found a free slot */
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char termtype[32];
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#ifdef FULLSLAVENAME
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char slavepty[32]; /* For slave pty name */
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if (SAFEREAD(LispPipeIn, (char *)&tmp, 2) < 0) perror("Slave reading slave pty len");
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if (SAFEREAD(LispPipeIn, slavepty, tmp) < 0) perror("Slave reading slave pty id");
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#endif /* INDIGO */
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if (IOBuf[0] == 'P') { /* The new style, which takes term type & command to csh */
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if (SAFEREAD(LispPipeIn, (char *)&tmp, 2) < 0) perror("Slave reading cmd length");
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if (SAFEREAD(LispPipeIn, termtype, tmp) < 0) perror("Slave reading termtype");
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if (SAFEREAD(LispPipeIn, (char *)&tmp, 2) < 0) perror("Slave reading cmd length");
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if (tmp > 510)
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cmdstring = (char *)malloc(tmp + 5);
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else
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cmdstring = shcom;
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if (SAFEREAD(LispPipeIn, cmdstring, tmp) < 0) perror("Slave reading shcom");
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} else /* old style, no args */
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{
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termtype[0] = 0;
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cmdstring[0] = 0;
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}
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/* Alloc a PTY and fork */
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#ifdef FULLSLAVENAME
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pid = ForkUnixShell(slot, slavepty, termtype, cmdstring);
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#else
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pid = ForkUnixShell(slot, IOBuf[1], IOBuf[2], termtype, cmdstring);
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#endif
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if (pid == -1) {
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printf("Impossible failure from ForkUnixShell??\n");
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fflush(stdout);
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IOBuf[3] = 0;
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} else {
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/* ForkUnixShell sets the pid and standard in/out variables */
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IOBuf[1] = (pid >> 8) & 0xFF;
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IOBuf[2] = pid & 0xFF;
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}
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} else {
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printf("Can't get process slot for PTY shell.\n");
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fflush(stdout);
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IOBuf[3] = 0;
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}
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break;
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case 'F': /* Fork pipe command */
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if (slot >= 0) {
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/* Read in the length of the shell command, and then the command */
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if (SAFEREAD(LispPipeIn, (char *)&tmp, 2) < 0) perror("Slave reading cmd length");
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if (tmp > 510)
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cmdstring = (char *)malloc(tmp + 5);
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else
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cmdstring = shcom;
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if (SAFEREAD(LispPipeIn, cmdstring, tmp) < 0) perror("Slave reading cmd");
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DBPRINT(("Cmd len = %d.\n", tmp));
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DBPRINT(("Rev'd cmd string: %s\n", cmdstring));
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pid = fork(); /* Fork */
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if (pid == 0) {
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int i;
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int status, sock;
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#ifndef ISC
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struct sockaddr_un addr;
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char PipeName[40];
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock < 0) {
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perror("slave socket");
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exit(0);
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}
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sprintf(PipeName, "/tmp/LPU%ld-%d", StartTime, slot);
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addr.sun_family = AF_UNIX;
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strcpy(addr.sun_path, PipeName);
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status =
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connect(sock, (struct sockaddr *)&addr, strlen(PipeName) + sizeof(addr.sun_family));
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if (status < 0) {
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perror("slave connect");
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printf("Name = %s.\n", PipeName);
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fflush(stdout);
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exit(0);
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} else {
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DBPRINT(("Slave connected on %s.\n", PipeName));
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}
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/* Copy the pipes onto stdin, stdout, and stderr */
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dup2(sock, 0);
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dup2(sock, 1);
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dup2(sock, 2);
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#else
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/* New, FIFO-based communication regime */
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int down, up; /* fifo fds */
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char DownFIFO[48], UpFIFO[48];
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sprintf(DownFIFO, "/tmp/LPD%d-%d", StartTime, slot);
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sprintf(UpFIFO, "/tmp/LPU%d-%d", StartTime, slot);
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if ((down = open(DownFIFO, O_RDONLY | O_NDELAY)) < 0) {
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|
perror("slave opening down fifo");
|
|
exit(0);
|
|
}
|
|
if ((up = open(UpFIFO, O_WRONLY | O_NDELAY)) < 0) {
|
|
perror("slave opening up fifo");
|
|
exit(0);
|
|
}
|
|
|
|
/* Copy the fifos onto stdin, stdout, and stderr */
|
|
dup2(down, 0);
|
|
dup2(up, 1);
|
|
dup2(up, 2);
|
|
|
|
/* unlink(DownFIFO);
|
|
unlink(UpFIFO); */
|
|
|
|
#endif /* oldPIPEway */
|
|
|
|
#ifdef SYSVONLY
|
|
/* Make sure everything else is closed POSIX has no getdtab... */
|
|
for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) close(i);
|
|
#else
|
|
/* Make sure everything else is closed */
|
|
for (i = 3; i < getdtablesize(); i++) close(i);
|
|
#endif /* HPUX */
|
|
|
|
/* Run the shell command and get the result */
|
|
status = system(cmdstring);
|
|
if (cmdstring != shcom) free(cmdstring);
|
|
/* Comment out to fix USAR 11302 (FXAR 320)
|
|
unlink(PipeName);
|
|
*/
|
|
_exit((status & ~0xff) ? (status >> 8) : status);
|
|
}
|
|
|
|
/* Check for error doing the fork */
|
|
if (pid == (pid_t)-1) {
|
|
perror("unixcomm: fork");
|
|
IOBuf[3] = 0;
|
|
} else {
|
|
IOBuf[1] = (pid >> 8) & 0xFF;
|
|
IOBuf[2] = pid & 0xFF;
|
|
}
|
|
} else {
|
|
printf("No process slots available.\n");
|
|
IOBuf[3] = 0; /* Couldn't get a process slot */
|
|
}
|
|
break;
|
|
|
|
case 'W': /* Wait for a process to die. */
|
|
{
|
|
int pid;
|
|
#if defined(SYSVONLY) || defined(WAITINT)
|
|
int status;
|
|
#else
|
|
union wait status;
|
|
#endif /* SYSVONLY */
|
|
|
|
int slot;
|
|
|
|
#if defined(SYSVONLY) || defined(WAITINT)
|
|
status = 0;
|
|
#else
|
|
status.w_status = 0;
|
|
#endif /* SYSVONLY */
|
|
|
|
IOBuf[0] = 0;
|
|
IOBuf[1] = 0;
|
|
DBPRINT(("About to wait for processes.\n"));
|
|
#ifdef SYSVONLY
|
|
retry1:
|
|
pid = waitpid(-1, &status, WNOHANG);
|
|
if (pid == -1 && errno == EINTR) goto retry1;
|
|
#else
|
|
pid = wait3(&status, WNOHANG, 0);
|
|
#endif /* SYSVONLY */
|
|
if (pid > 0)
|
|
|
|
{
|
|
/* Ignore processes which are suspended but haven't exited
|
|
(this shouldn't happen) */
|
|
#if defined(SYSVONLY) || defined(WAITINT)
|
|
if (WIFSTOPPED(status)) break;
|
|
IOBuf[3] = status >> 8;
|
|
IOBuf[2] = status & 0xFF;
|
|
#else
|
|
if (status.w_stopval == WSTOPPED) break;
|
|
IOBuf[3] = status.w_T.w_Retcode;
|
|
IOBuf[2] = status.w_T.w_Termsig;
|
|
#endif /* SYSVONLY */
|
|
|
|
IOBuf[1] = pid & 0xFF;
|
|
IOBuf[0] = (pid >> 8) & 0xFF;
|
|
}
|
|
DBPRINT(("wait3 returned pid = %d.\n", pid));
|
|
}
|
|
|
|
break;
|
|
|
|
case 'C': /* Close stdin to subprocess */ break;
|
|
|
|
case 'K': /* Kill subprocess */ break;
|
|
|
|
#ifdef OCR
|
|
case 'w': /* Wait paticular process to die */
|
|
{
|
|
int pid, res, status;
|
|
|
|
pid = IOBuf[1] << 8 | IOBuf[2];
|
|
|
|
retry:
|
|
res = waitpid(pid, &status, WNOHANG);
|
|
if (res == -1 && errno == EINTR) goto retry;
|
|
|
|
if (res == pid) {
|
|
IOBuf[0] = res >> 24 & 0xFF;
|
|
IOBuf[1] = res >> 16 & 0xFF;
|
|
IOBuf[2] = res >> 8 & 0xFF;
|
|
IOBuf[3] = res & 0xFF;
|
|
} else {
|
|
IOBuf[0] = IOBuf[1] = IOBuf[2] = IOBuf[3] = 0;
|
|
}
|
|
} break;
|
|
|
|
case 'O': /* Fork OCR process */
|
|
if (slot >= 0) {
|
|
pid_t ppid;
|
|
ppid = getppid();
|
|
pid = fork();
|
|
if (pid == 0) {
|
|
int i;
|
|
int status, len;
|
|
struct sockaddr_un addr;
|
|
char PipeName[40];
|
|
extern int OCR_sv;
|
|
|
|
OCR_sv = socket(AF_UNIX, SOCK_STREAM, 0);
|
|
if (OCR_sv < 0) {
|
|
perror("slave socket");
|
|
exit(0);
|
|
}
|
|
sprintf(PipeName, "/tmp/LispPipe%d-%d", StartTime, slot);
|
|
addr.sun_family = AF_UNIX;
|
|
strcpy(addr.sun_path, PipeName);
|
|
len = strlen(PipeName) + sizeof(addr.sun_family);
|
|
status = connect(OCR_sv, &addr, len);
|
|
if (status < 0) {
|
|
perror("OCR slave connect");
|
|
OCR_sv = -1;
|
|
exit(0);
|
|
}
|
|
|
|
(void)ocr_proc(ppid);
|
|
OCR_sv = -1;
|
|
exit(1);
|
|
}
|
|
|
|
if (pid == -1) {
|
|
perror("unixcomm: fork OCR");
|
|
IOBuf[3] = 0;
|
|
} else {
|
|
IOBuf[1] = (pid >> 8) & 0xFF;
|
|
IOBuf[2] = pid & 0xFF;
|
|
}
|
|
} else
|
|
IOBuf[3] = 0;
|
|
break;
|
|
#endif /* OCR */
|
|
|
|
} /* End of switch */
|
|
|
|
/* Return the status/data packet */
|
|
write(LispPipeOut, IOBuf, 4);
|
|
}
|
|
}
|
|
|