Date: Fri, 27 Oct 2000 17:04:40 -0700 (PDT) From: Ed Alley <alley1@llnl.gov> To: freebsd-questions@freebsd.org Cc: Ed Alley <wea@trevarno.llnl.gov> Subject: FreeBSD hangs when running ghostscripe as a print filter. Message-ID: <Pine.BSF.4.10.10010271656010.395-300000@trevarno.llnl.gov>
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[-- Attachment #1 --]
Hello:
My name is Ed Alley. I am running FreeBSD 3.3 on my home
computer. I have sent you two attachments: my printcap file
and a simplified version of the printer filter that I am running.
Whenever I output a large Postscript file, it appears that
Ghostscript takes all of the CPU ticks; it holds on and won't
release the CPU. While I wait for it to finish, my X-window
pointer freezes and sometimes the system freezes permanently;
I have even had it panic on me with a page fault.
Do you have any idea what is going on? I should note that
the very same setup with Linux runs OK. (:-<)
I am anxious to hear from you on this one; I have
been battling this one for months.
Ed Alley
wea@llnl.gov
[-- Attachment #2 --]
#
# Copyright (c) 1983 Regents of the University of California.
# All rights reserved.
#
# Redistribution and use in source and binary forms are permitted
# provided that this notice is preserved and that due credit is given
# to the University of California at Berkeley. The name of the University
# may not be used to endorse or promote products derived from this
# software without specific prior written permission. This software
# is provided ``as is'' without express or implied warranty.
#
# @(#)etc.printcap 5.2 (Berkeley) 5/5/88
#
lp|HP Laserjet 5P entry:\
:lp=/dev/lpt0:\
:sd=/var/spool/output/lp1:\
:lf=/var/log/lpd_errs:\
:lo=/var/spool/output/lp1/lock:\
:if=/usr/local/libexec/lpr/lp.if:\
:af=/var/account/lp1.acct:\
:pc#100:pl#66:pw#80:\
:mx#0:sh:sf
[-- Attachment #3 --]
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
/*
This printer filter turns my printer into a Postscript printer.
It does this by looking for the beginning string sequence "%!"
in stdin then rewinding by doing lseek to the beginning. If it
finds the test string it pipes stdin into ghostscript otherwise
it pipes stdin into cat.
*/
int write_b (int,char*,int);
main()
{
char cc[3];
int c;
int fds[2];
if ((c = getchar()) == EOF) exit (1);
cc[0] = c;
if ((c = getchar()) == EOF) exit (1);
cc[1] = c;
cc[2] = '\0';
if (strcmp( "%!", cc) == 0) { /* Check for Postscript */
pipe (fds);
switch (fork()) { /* We have Postscript so send it through gs */
case -1:
printf("Can't fork; quitting!\n");
exit (1);
case 0:
dup2(fds[1],1);
dup2(fds[1],2);
close(fds[0]);
close(fds[1]);
write(1,cc,2);
while ((c = getchar()) != EOF) /* Send it down the pipe to gs */
write_b(1,(char*)&c,1);
write_b(1,(char*)NULL, -1);
exit(0);
default:
dup2(fds[0],0);
close(fds[0]);
close(fds[1]);
execl("/usr/local/bin/gs", "gs", "-q", "-dNOPAUSE", "-dSAFER",
"-sPAPERSIZE=note", "-sDEVICE=ljet4", "-sOutputFile=-",
"-", (char*)NULL);
printf("Can't exec gs; quitting!\n");
exit(1);
}
} else if (cc[0] == '\033') { /* Check for PCL */
write(1,cc,2);
while ((c = getchar()) != EOF) /* It's PCL so send it along */
write_b(1,(char*)&c,1);
write_b(1,(char*)NULL,-1);
exit(0);
} else { /* Treat as pure text */
write(1,"\033%-12345X@PJL\n",14); /* Wrap it in PCL commands */
write(1,"@PJL ENTER LANGUAGE = PCL\n",26);
write(1,"\033E\033&k2G",7);
write(1,cc,2);
while ((c = getchar()) != EOF)
write_b(1,(char*)&c,1);
write_b(1,(char*)NULL,-1);
write(1,"\033E\033%-12345X",11);
exit(0);
}
}
/* Buffers characters before writing, then writes buffer. */
int write_b (int fd, char *cc, int n)
{
# define BUFSIZE 1024
static char *buff = NULL;
static int count = 0;
if (n > 0) {
if (buff == NULL) {
if ((buff = (char*)malloc(sizeof(char)*BUFSIZE)) == NULL)
return -1;
}
buff[count++] = *cc;
if (count >= BUFSIZE) {
write(fd, buff, BUFSIZE);
count = 0;
}
} else {
if (count > 0)
write (fd, buff, count);
if (buff != NULL) free (buff);
buff = NULL;
}
return 0;
}
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