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/* Copyright (c) 1993 Regents of the University of California */ |
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/* Copyright (c) 1995 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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*/ |
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#include "standard.h" |
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#ifdef F_SETLKW |
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#include "paths.h" |
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#include <signal.h> |
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#include <sys/types.h> |
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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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|
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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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pfhold() /* holding pattern for idle rendering process */ |
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{ |
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char buf[128]; |
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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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fflush(stdout); |
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close(fileno(stdout)); |
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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) |
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if (mknod(mktemp(strcpy(inpname,TEMPLATE)), S_IFIFO|0600, 0) < 0) |
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goto createrr; |
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if (mknod(mktemp(strcpy(outpname,TEMPLATE)), S_IFIFO|0600) < 0) |
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if (mknod(mktemp(strcpy(outpname,TEMPLATE)), S_IFIFO|0600, 0) < 0) |
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goto createrr; |
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sprintf(buf, "%d\n%s\n%s\n", getpid(), inpname, outpname); |
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if (lseek(persistfd, 0L, 0) < 0) |
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error(SYSTEM, "seek error on persist file in pfhold"); |
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sprintf(buf, "%s %d\n%s\n%s\n", progname, getpid(), inpname, outpname); |
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if (lseek(persistfd, 0L, 0) < 0 || ftruncate(persistfd, 0L) < 0) |
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error(SYSTEM, "seek/truncate error on persist file"); |
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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 in pfhold"); |
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error(SYSTEM, "error writing persist file"); |
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/* wait TIMELIM for someone to signal us */ |
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signal(SIGIO, sig_noop); |
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alarm(TIMELIM); |
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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[4096], *pfin, *pfout; |
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char buf[512], *pfin, *pfout; |
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int pid; |
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/* load and close persist file */ |
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nr = read(persistfd, buf, sizeof(buf)); |
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nr = read(persistfd, buf, sizeof(buf)-1); |
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pfdetach(); |
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if (nr < 0) |
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error(SYSTEM, "cannot read persist file"); |
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buf[nr] = '\0'; |
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if ((cp = index(buf, '\n')) == NULL) |
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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(buf)) <= 0) |
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if ((pid = atoi(cp)) <= 0) |
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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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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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*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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error(SYSTEM, "fork failed in io_process"); |
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/* connect to appropriate pipe */ |
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if (pid) { /* parent passes renderer output */ |
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if (freopen(pfout, "r", stdin) == NULL) |
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close(0); |
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if (open(pfout, O_RDONLY) != 0) |
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error(SYSTEM, "cannot open input pipe in io_process"); |
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} else { /* child passes renderer input */ |
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if (freopen(pfin, "w", stdout) == NULL) |
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error(SYSTEM, "cannot open input pipe in io_process"); |
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close(1); |
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if (open(pfin, O_WRONLY) != 1) |
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error(SYSTEM, "cannot open output pipe in io_process"); |
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} |
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/* pass input to output */ |
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cp = buf; n = sizeof(buf); |
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while ((nr = read(fileno(stdin), cp, n)) > 0) { |
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nr += cp-buf; |
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if ((n = write(fileno(stdout), buf, nr)) <= 0) |
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error(SYSTEM, "write error in io_process"); |
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cp = buf; |
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while (n < nr) |
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*cp++ = buf[n++]; |
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n = sizeof(buf) - (cp-buf); |
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} |
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fclose(stdin); |
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fclose(stdout); |
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/* read as much as we can, write all of it */ |
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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(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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if (nr < 0) |
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error(SYSTEM, "read error in io_process"); |
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close(0); /* close input */ |
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close(1); /* close output */ |
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if (pid) /* parent waits for child */ |
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wait(0); |
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exit(0); /* all done, exit (not quit!) */ |
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formerr: |
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error(USER, "format error in persist file"); |
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writerr: |
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error(SYSTEM, "write error in io_process"); |
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} |
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|
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#else |
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pfclean() {} |
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|
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#endif |
