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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for persistent rtrace and rpict processes. |
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* |
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* External symbols declared in ray.h |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#include "standard.h" |
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#include "random.h" |
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|
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#ifdef F_SETLKW |
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#include "paths.h" |
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#include "selcall.h" |
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#include <signal.h> |
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#include <sys/stat.h> |
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|
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#ifndef TIMELIM |
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#define TIMELIM (8*3600) /* time limit for holding pattern */ |
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#endif |
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|
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#ifndef freebsd |
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#define mkfifo(fn,md) mknod(fn, S_IFIFO|(md), 0) |
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#endif |
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|
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extern void io_process(); |
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|
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extern int headismine; /* boolean true if header belongs to me */ |
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|
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extern char *progname; /* global program name */ |
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|
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extern char *errfile; /* global error file name */ |
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|
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static char *persistfname = NULL; /* persist file name */ |
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static int persistfd = -1; /* persist file descriptor */ |
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|
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static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1]; |
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|
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|
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void |
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pfdetach() /* release persist (and header) resources */ |
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{ |
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if (persistfd >= 0) |
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close(persistfd); |
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persistfd = -1; |
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persistfname = NULL; |
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inpname[0] = '\0'; |
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outpname[0] = '\0'; |
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errname[0] = '\0'; |
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headismine = 0; |
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} |
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|
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|
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void |
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pfclean() /* clean up persist files */ |
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{ |
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if (persistfd >= 0) |
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close(persistfd); |
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if (persistfname != NULL) |
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unlink(persistfname); |
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if (inpname[0]) |
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unlink(inpname); |
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if (outpname[0]) |
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unlink(outpname); |
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if (errname[0]) |
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unlink(errname); |
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} |
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|
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|
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void |
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pflock(lf) /* place or release exclusive lock on file */ |
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int lf; |
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{ |
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struct flock fls; |
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|
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fls.l_type = lf ? F_WRLCK : F_UNLCK; |
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fls.l_whence = 0; |
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fls.l_start = 0L; |
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fls.l_len = 0L; |
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if (fcntl(persistfd, F_SETLKW, &fls) < 0) |
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error(SYSTEM, "cannot (un)lock persist file"); |
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} |
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|
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|
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persistfile(pfn) /* open persist file and lock it */ |
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char *pfn; |
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{ |
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persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0644); |
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if (persistfd >= 0) { |
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persistfname = pfn; |
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pflock(1); |
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return; |
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} |
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/* file exists -- switch to i/o process */ |
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persistfd = open(pfn, O_RDWR); |
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if (persistfd < 0) { |
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sprintf(errmsg, "cannot open persist file \"%s\"", pfn); |
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error(SYSTEM, errmsg); |
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} |
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pflock(1); |
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io_process(); /* never returns */ |
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} |
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|
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|
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static int got_io; |
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|
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static void sig_io() { got_io++; } |
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|
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static void sig_alrm() { quit(0); } |
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|
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|
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void |
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pfhold() /* holding pattern for idle rendering process */ |
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{ |
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void (*oldalrm)(); |
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char buf[512]; |
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register int n; |
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/* close input and output descriptors */ |
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close(fileno(stdin)); |
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close(fileno(stdout)); |
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if (errfile == NULL) |
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close(fileno(stderr)); |
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/* create named pipes for input and output */ |
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if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0) |
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goto createrr; |
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if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0) |
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goto createrr; |
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if (errfile == NULL && |
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mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0) |
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goto createrr; |
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sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(), |
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inpname, outpname, errname); |
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n = strlen(buf); |
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if (write(persistfd, buf, n) < n) |
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error(SYSTEM, "error writing persist file"); |
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lseek(persistfd, (off_t)0L, 0); |
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/* wait TIMELIM for someone to signal us */ |
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got_io = 0; |
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signal(SIGIO, sig_io); |
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oldalrm = (void (*)())signal(SIGALRM, sig_alrm); |
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alarm(TIMELIM); |
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pflock(0); /* unlock persist file for attach */ |
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while (!got_io) |
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pause(); /* wait for attach */ |
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alarm(0); /* turn off alarm */ |
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signal(SIGALRM, oldalrm); |
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signal(SIGIO, SIG_DFL); |
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pflock(1); /* grab persist file back */ |
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/* someone wants us; reopen stdin and stdout */ |
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/* |
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if (freopen(inpname, "r", stdin) == NULL) |
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goto openerr; |
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if (freopen(outpname, "w", stdout) == NULL) |
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goto openerr; |
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*/ |
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close(0); |
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if (open(inpname, O_RDONLY) != 0) |
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error(INTERNAL, "unexpected stdin file number"); |
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clearerr(stdin); |
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close(1); |
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if (open(outpname, O_WRONLY) != 1) |
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error(INTERNAL, "unexpected stdout file number"); |
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sleep(3); /* give them a chance to open their pipes */ |
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if (errname[0]) { |
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close(2); |
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if (open(errname, O_WRONLY) != 2) |
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error(INTERNAL, "unexpected stderr file number"); |
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unlink(errname); |
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errname[0] = '\0'; |
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} |
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unlink(inpname); |
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inpname[0] = '\0'; |
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unlink(outpname); |
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outpname[0] = '\0'; |
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return; |
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createrr: |
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error(SYSTEM, "cannot create named pipes in pfhold"); |
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openerr: |
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error(SYSTEM, "cannot open named pipes in pfhold"); |
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} |
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|
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|
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void |
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io_process() /* just act as go-between for actual process */ |
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{ |
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register char *cp; |
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register int nr, n; |
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char buf[BUFSIZ], *pfin, *pfout, *pferr; |
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int pid, nfds; |
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int fdout, fderr = -1; |
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int status = 0; |
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fd_set readfds, excepfds; |
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/* load persist file */ |
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n = 40; |
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while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) { |
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if (!n--) |
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error(USER, "unattended persist file?"); |
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pflock(0); |
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sleep(3+(3*getpid()+random())%13); /* wait until ready */ |
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pflock(1); |
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} |
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if (nr < 0) |
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error(SYSTEM, "error reading persist file"); |
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ftruncate(persistfd, (off_t)0L); /* truncate persist file */ |
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pfdetach(); /* close & release persist file */ |
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buf[nr] = '\0'; /* parse what we got */ |
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if ((cp = index(buf, ' ')) == NULL) |
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goto formerr; |
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*cp++ = '\0'; |
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if ((pid = atoi(cp)) <= 0) |
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goto formerr; |
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if ((cp = index(cp, '\n')) == NULL) |
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goto formerr; |
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pfin = ++cp; |
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if ((cp = index(cp, '\n')) == NULL) |
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goto formerr; |
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*cp++ = '\0'; |
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pfout = cp; |
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if ((cp = index(cp, '\n')) == NULL) |
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goto formerr; |
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*cp++ = '\0'; |
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pferr = cp; |
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if ((cp = index(cp, '\n')) == NULL) |
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goto formerr; |
283 |
*cp++ = '\0'; |
284 |
if (cp-buf != nr) |
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goto formerr; |
286 |
if (strcmp(buf, progname)) { |
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sprintf(errmsg, "persist file for %s, not %s", buf, progname); |
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error(USER, errmsg); |
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} |
290 |
/* wake up rendering process */ |
291 |
if (kill(pid, SIGIO) < 0) |
292 |
error(SYSTEM, "cannot signal rendering process in io_process"); |
293 |
/* fork child feeder process */ |
294 |
pid = fork(); |
295 |
if (pid < 0) |
296 |
error(SYSTEM, "fork failed in io_process"); |
297 |
if (pid == 0) { /* feeder loop */ |
298 |
int fdin; |
299 |
close(1); /* open input pipe */ |
300 |
if ((fdin = open(pfin, O_WRONLY)) < 0) |
301 |
error(SYSTEM, "cannot open feed pipe in io_process"); |
302 |
/* renderer stdin */ |
303 |
while ((nr = read(0, cp=buf, sizeof(buf))) > 0) { |
304 |
do { |
305 |
if ((n = write(fdin, cp, nr)) <= 0) |
306 |
goto writerr; |
307 |
cp += n; |
308 |
} while ((nr -= n) > 0); |
309 |
} |
310 |
if (nr < 0) |
311 |
goto readerr; |
312 |
_exit(0); |
313 |
} |
314 |
close(0); |
315 |
/* open output pipes, in order */ |
316 |
if ((fdout = open(pfout, O_RDONLY)) < 0) |
317 |
error(SYSTEM, "cannot open output pipe in io_process"); |
318 |
if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0) |
319 |
error(SYSTEM, "cannot open error pipe in io_process"); |
320 |
for ( ; ; ) { /* eater loop */ |
321 |
FD_ZERO(&readfds); |
322 |
FD_ZERO(&excepfds); |
323 |
nfds = 0; |
324 |
if (fdout >= 0) { |
325 |
FD_SET(fdout, &readfds); |
326 |
FD_SET(fdout, &excepfds); |
327 |
nfds = fdout+1; |
328 |
} |
329 |
if (fderr >= 0) { |
330 |
FD_SET(fderr, &readfds); |
331 |
FD_SET(fderr, &excepfds); |
332 |
nfds = fderr+1; |
333 |
} |
334 |
if (nfds == 0) |
335 |
break; /* all done, exit */ |
336 |
if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0) |
337 |
error(SYSTEM, "error in select call in io_process"); |
338 |
/* renderer stderr */ |
339 |
if (fderr >= 0 && (FD_ISSET(fderr, &readfds) || |
340 |
FD_ISSET(fderr, &excepfds))) { |
341 |
nr = read(fderr, cp=buf, sizeof(buf)); |
342 |
if (nr < 0) |
343 |
goto readerr; |
344 |
if (nr == 0) { |
345 |
close(fderr); |
346 |
/* close(2); don't close stderr! */ |
347 |
fderr = -1; |
348 |
} else { |
349 |
cp[nr] = '\0'; /* deduce status if we can */ |
350 |
n = strlen(progname); |
351 |
if (!strncmp(cp, progname, n) && |
352 |
cp[n++] == ':' && |
353 |
cp[n++] == ' ') { |
354 |
register struct erract *ep; |
355 |
for (ep = erract; ep < erract+NERRS; |
356 |
ep++) |
357 |
if (ep->pre[0] && |
358 |
!strncmp(cp+n, ep->pre, |
359 |
strlen(ep->pre))) { |
360 |
status = ep->ec; |
361 |
break; |
362 |
} |
363 |
} |
364 |
do { /* write message */ |
365 |
if ((n = write(2, cp, nr)) <= 0) |
366 |
goto writerr; |
367 |
cp += n; |
368 |
} while ((nr -= n) > 0); |
369 |
} |
370 |
} |
371 |
/* renderer stdout */ |
372 |
if (fdout >= 0 && (FD_ISSET(fdout, &readfds) || |
373 |
FD_ISSET(fdout, &excepfds))) { |
374 |
nr = read(fdout, cp=buf, sizeof(buf)); |
375 |
if (nr < 0) |
376 |
goto readerr; |
377 |
if (nr == 0) { /* EOF */ |
378 |
close(fdout); |
379 |
close(1); |
380 |
fdout = -1; |
381 |
} else |
382 |
do { /* write it all */ |
383 |
if ((n = write(1, cp, nr)) <= 0) |
384 |
goto writerr; |
385 |
cp += n; |
386 |
} while ((nr -= n) > 0); |
387 |
} |
388 |
} |
389 |
wait(0); /* wait for feeder process */ |
390 |
_exit(status); |
391 |
formerr: |
392 |
error(USER, "format error in persist file"); |
393 |
readerr: |
394 |
error(SYSTEM, "read error in io_process"); |
395 |
writerr: |
396 |
error(SYSTEM, "write error in io_process"); |
397 |
} |
398 |
|
399 |
#else |
400 |
|
401 |
void pfclean() {} |
402 |
|
403 |
#endif |