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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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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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#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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|
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#include "platform.h" |
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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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#include <signal.h> |
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#include <sys/stat.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 char *strcpy(), *index(); |
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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 (sighandler_t)(int); |
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static sighandler_t sig_io; |
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static sighandler_t sig_alrm; |
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pfdetach() /* release persist (and header) resources */ |
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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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} |
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pfclean() /* clean up persist files */ |
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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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} |
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pflock(lf) /* place or release exclusive lock on file */ |
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int lf; |
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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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} |
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persistfile(pfn) /* open persist file and lock it */ |
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char *pfn; |
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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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static int got_io; |
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static int sig_io() { got_io++; } |
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static void sig_io(int i) { got_io++; } |
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static int sig_alrm() { quit(0); } |
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static void sig_alrm(int i) { quit(0); } |
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pfhold() /* holding pattern for idle rendering process */ |
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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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int (*oldalrm)(); |
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sighandler_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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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 (mknod(mktemp(strcpy(inpname,TEMPLATE)), S_IFIFO|0600, 0) < 0) |
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if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0) |
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goto createrr; |
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if (mknod(mktemp(strcpy(outpname,TEMPLATE)), S_IFIFO|0600, 0) < 0) |
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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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mknod(mktemp(strcpy(errname,TEMPLATE)), S_IFIFO|0600, 0) < 0) |
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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, 0L, 0); |
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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 = (int (*)())signal(SIGALRM, sig_alrm); |
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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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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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if (freopen(errname, "w", stderr) == NULL) |
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goto openerr; |
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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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} |
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io_process() /* just act as go-between for actual process */ |
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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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} |
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if (nr < 0) |
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error(SYSTEM, "error reading persist file"); |
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ftruncate(persistfd, 0L); /* truncate 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 = index(buf, ' ')) == NULL) |
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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 = index(cp, '\n')) == NULL) |
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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 = index(cp, '\n')) == NULL) |
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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 = index(cp, '\n')) == NULL) |
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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 = index(cp, '\n')) == NULL) |
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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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} while ((nr -= n) > 0); |
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} |
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} |
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wait(0); /* wait for feeder process */ |
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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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#else |
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< |
pfclean() {} |
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extern void pfclean(void) {} |
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#endif |
