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#ifndef lint
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static const char RCSid[] = "$Id: persist.c,v 2.41 2008/05/01 15:50:28 greg Exp $";
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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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#include "copyright.h"
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#include <string.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "platform.h"
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#ifndef NON_POSIX /* XXX need abstraction for process management */
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#include <sys/wait.h>
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#endif
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#include "rtprocess.h" /* getpid() */
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#include "standard.h"
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#include "random.h"
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#include "ray.h"
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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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#ifndef TIMELIM
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#define TIMELIM (8*3600) /* time limit for holding pattern */
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#endif
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extern int headismine; /* boolean true if header belongs to me */
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extern char *progname; /* global program name */
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extern char *errfile; /* global error file name */
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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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static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1];
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typedef void (rsighandler_t)(int);
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static rsighandler_t sig_io;
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static rsighandler_t sig_alrm;
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extern void
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pfdetach(void) /* 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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extern void
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pfclean(void) /* 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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extern void
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pflock( /* place or release exclusive lock on file */
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int lf
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)
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{
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struct flock fls;
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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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extern void
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persistfile( /* open persist file and lock it */
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char *pfn
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)
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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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static int got_io;
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static void sig_io(int i) { got_io++; }
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static void sig_alrm(int i) { quit(0); }
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extern void
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pfhold(void) /* holding pattern for idle rendering process */
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{
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rsighandler_t *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(0);
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close(1);
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if (errfile == NULL)
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close(2);
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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)0, SEEK_SET);
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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 = 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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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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}
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extern void
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io_process(void) /* 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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#ifndef _WIN32 /* XXX we need a replacement for that one */
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ftruncate(persistfd, (off_t)0L); /* truncate persist file */
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#endif
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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 = strchr(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 = strchr(cp, '\n')) == NULL)
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goto formerr;
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pfin = ++cp;
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if ((cp = strchr(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 = strchr(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 = strchr(cp, '\n')) == NULL)
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goto formerr;
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*cp++ = '\0';
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if (cp-buf != nr)
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goto formerr;
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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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}
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/* wake up rendering process */
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if (kill(pid, SIGIO) < 0)
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error(SYSTEM, "cannot signal rendering process in io_process");
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/* fork child feeder process */
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pid = fork();
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if (pid < 0)
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error(SYSTEM, "fork failed in io_process");
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if (pid == 0) { /* feeder loop */
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int fdin;
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close(1); /* open input pipe */
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if ((fdin = open(pfin, O_WRONLY)) < 0)
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error(SYSTEM, "cannot open feed pipe in io_process");
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/* renderer stdin */
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while ((nr = read(0, cp=buf, sizeof(buf))) > 0) {
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do {
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if ((n = write(fdin, cp, nr)) <= 0)
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goto writerr;
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cp += n;
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} while ((nr -= n) > 0);
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}
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if (nr < 0)
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goto readerr;
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_exit(0);
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}
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close(0);
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/* open output pipes, in order */
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if ((fdout = open(pfout, O_RDONLY)) < 0)
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error(SYSTEM, "cannot open output pipe in io_process");
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if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0)
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error(SYSTEM, "cannot open error pipe in io_process");
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for ( ; ; ) { /* eater loop */
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FD_ZERO(&readfds);
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FD_ZERO(&excepfds);
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nfds = 0;
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if (fdout >= 0) {
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FD_SET(fdout, &readfds);
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FD_SET(fdout, &excepfds);
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nfds = fdout+1;
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}
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if (fderr >= 0) {
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FD_SET(fderr, &readfds);
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FD_SET(fderr, &excepfds);
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nfds = fderr+1;
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}
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if (nfds == 0)
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break; /* all done, exit */
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if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0)
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error(SYSTEM, "error in select call in io_process");
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/* renderer stderr */
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if (fderr >= 0 && (FD_ISSET(fderr, &readfds) ||
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FD_ISSET(fderr, &excepfds))) {
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nr = read(fderr, cp=buf, sizeof(buf));
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if (nr < 0)
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goto readerr;
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if (nr == 0) {
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close(fderr);
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/* close(2); don't close stderr! */
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fderr = -1;
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} else {
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cp[nr] = '\0'; /* deduce status if we can */
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n = strlen(progname);
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if (!strncmp(cp, progname, n) &&
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cp[n++] == ':' &&
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cp[n++] == ' ') {
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register struct erract *ep;
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for (ep = erract; ep < erract+NERRS;
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ep++)
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if (ep->pre[0] &&
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!strncmp(cp+n, ep->pre,
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strlen(ep->pre))) {
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status = ep->ec;
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break;
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}
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}
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do { /* write message */
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if ((n = write(2, cp, nr)) <= 0)
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goto writerr;
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cp += n;
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} while ((nr -= n) > 0);
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}
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}
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/* renderer stdout */
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if (fdout >= 0 && (FD_ISSET(fdout, &readfds) ||
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FD_ISSET(fdout, &excepfds))) {
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nr = read(fdout, cp=buf, sizeof(buf));
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if (nr < 0)
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goto readerr;
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if (nr == 0) { /* EOF */
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close(fdout);
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close(1);
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fdout = -1;
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} else
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do { /* write it all */
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if ((n = write(1, cp, nr)) <= 0)
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goto writerr;
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cp += n;
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} while ((nr -= n) > 0);
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}
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}
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kill(pid, SIGTERM); /* no more process to feed, so... */
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waitpid(pid, 0, 0); /* wait for feeder process */
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_exit(status);
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formerr:
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error(USER, "format error in persist file");
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readerr:
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error(SYSTEM, "read error in io_process");
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writerr:
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error(SYSTEM, "write error in io_process");
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}
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#else
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extern void pfclean(void) {}
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#endif
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