xref: /csrg-svn/usr.sbin/lpr/lpd/printjob.c (revision 15811)

#ifndef lint
static char sccsid[] = "@(#)printjob.c	4.16 (Berkeley) 01/05/84";
#endif

/*
 * printjob -- print jobs in the queue.
 *
 *	NOTE: the lock file is used to pass information to lpq and lprm.
 *	it does not need to be removed because file locks are dynamic.
 */

#include "lp.h"

#define DORETURN	0		/* absorb fork error */
#define DOABORT		1		/* abort if dofork fails */

static char	title[80];		/* ``pr'' title */
static FILE	*cfp;			/* control file */
static int	pfd;			/* printer file descriptor */
static int	ofd;			/* output filter file descriptor */
static int	lfd;			/* lock file descriptor */
static int	pid;			/* pid of lpd process */
static int	prchild;		/* id of pr process */
static int	child;			/* id of any filters */
static int	ofilter;		/* id of output filter, if any */
static int	tof;			/* true if at top of form */
static int	count;			/* Number of files actually printed */
static int	remote;			/* true if sending files to remote */

static char	fromhost[32];		/* user's host machine */
static char	logname[32];		/* user's login name */
static char	jobname[100];		/* job or file name */
static char	class[32];		/* classification field */
static char	width[10] = "-w";	/* page width in characters */
static char	length[10] = "-l";	/* page length in lines */
static char	pxwidth[10] = "-x";	/* page width in pixels */
static char	pxlength[10] = "-y";	/* page length in pixels */
static char	indent[10] = "-i0";	/* indentation size in characters */
static char	tmpfile[] = "errsXXXXXX"; /* file name for filter output */

printjob()
{
	struct stat stb;
	register struct queue *q, **qp;
	struct queue **queue;
	register int i, nitems;
	long pidoff;
	extern int onintr();

	init();					/* set up capabilities */
	(void) write(1, "", 1);			/* ack that daemon is started */
	(void) close(1);			/* set up log file */
	(void) close(2);
	if (open(LF, O_WRONLY|O_APPEND) < 0)
		(void) open("/dev/null", O_WRONLY);
	dup(1);
	pid = getpid();				/* for use with lprm */
	setpgrp(0, pid);
	signal(SIGHUP, onintr);
	signal(SIGINT, onintr);
	signal(SIGQUIT, onintr);
	signal(SIGTERM, onintr);

	(void) mktemp(tmpfile);

	/*
	 * uses short form file names
	 */
	if (chdir(SD) < 0) {
		log("cannot chdir to %s", SD);
		exit(1);
	}
	if (stat(LO, &stb) == 0 && (stb.st_mode & 0100))
		exit(0);		/* printing disabled */
	lfd = open(LO, O_WRONLY|O_CREAT, 0644);
	if (lfd < 0) {
		log("cannot create %s", LO);
		exit(1);
	}
	if (flock(lfd, LOCK_EX|LOCK_NB) < 0) {
		if (errno == EWOULDBLOCK)	/* active deamon present */
			exit(0);
		log("cannot lock %s", LO);
		exit(1);
	}
	ftruncate(lfd, 0);
	/*
	 * write process id for others to know
	 */
	sprintf(line, "%u\n", pid);
	pidoff = i = strlen(line);
	if (write(lfd, line, i) != i) {
		log("cannot write daemon pid");
		exit(1);
	}
	/*
	 * search the spool directory for work and sort by queue order.
	 */
	if ((nitems = getq(&queue)) < 0) {
		log("can't scan spool directory %s", SD);
		exit(1);
	}
	if (nitems == 0)		/* no work to do */
		exit(0);
	if (stb.st_mode & 01) {		/* reset queue flag */
		if (fchmod(lfd, stb.st_mode & 0776) < 0)
			log("cannot chmod %s", LO);
	}
	openpr();			/* open printer or remote */
again:
	/*
	 * we found something to do now do it --
	 *    write the name of the current control file into the lock file
	 *    so the spool queue program can tell what we're working on
	 */
	for (qp = queue; nitems--; free((char *) q)) {
		q = *qp++;
		if (stat(q->q_name, &stb) < 0)
			continue;
	restart:
		(void) lseek(lfd, pidoff, 0);
		(void) sprintf(line, "%s\n", q->q_name);
		i = strlen(line);
		if (write(lfd, line, i) != i)
			log("can't write (%d) control file name", errno);
		if (!remote)
			i = printit(q->q_name);
		else
			i = sendit(q->q_name);
		/*
		 * Check to see if we are supposed to stop printing or
		 * if we are to rebuild the queue.
		 */
		if (fstat(lfd, &stb) == 0) {
			if (stb.st_mode & 0100)
				goto done;
			if (stb.st_mode & 01) {
				for (free((char *) q); nitems--; free((char *) q))
					q = *qp++;
				if (fchmod(lfd, stb.st_mode & 0776) < 0)
					log("cannot chmod %s", LO);
				break;
			}
		}
		if (i == 0)		/* file ok and printed */
			count++;
		else if (i > 0) {	/* try reprinting the job */
			log("restarting");
			if (ofilter > 0) {
				kill(ofilter, SIGCONT);	/* to be sure */
				(void) close(ofd);
				while ((i = wait(0)) > 0 && i != ofilter)
					;
				ofilter = 0;
			}
			(void) close(pfd);	/* close printer */
			if (ftruncate(lfd, pidoff) < 0)
				log("can't truncate lock file (%d)", errno);
			openpr();		/* try to reopen printer */
			goto restart;
		}
	}
	free((char *) queue);
	/*
	 * search the spool directory for more work.
	 */
	if ((nitems = getq(&queue)) < 0) {
		log("can't scan spool directory %s", SD);
		exit(1);
	}
	if (nitems == 0) {		/* no more work to do */
	done:
		if (count > 0) {	/* Files actually printed */
			if (!SF && !tof)
				(void) write(ofd, FF, strlen(FF));
			if (TR != NULL)		/* output trailer */
				(void) write(ofd, TR, strlen(TR));
		}
		(void) unlink(tmpfile);
		exit(0);
	}
	goto again;
}

char	fonts[4][50];	/* fonts for troff */

static char ifonts[4][18] = {
	"/usr/lib/vfont/R",
	"/usr/lib/vfont/I",
	"/usr/lib/vfont/B",
	"/usr/lib/vfont/S"
};

/*
 * The remaining part is the reading of the control file (cf)
 * and performing the various actions.
 * Returns 0 if everthing was OK, 1 if we should try to reprint the job and
 * -1 if a non-recoverable error occured.
 */
static
printit(file)
	char *file;
{
	register int i;
	int bombed = 0;

	/*
	 * open control file
	 */
	if ((cfp = fopen(file, "r")) == NULL) {
		log("control file (%s) open failure <errno = %d>", file, errno);
		return(0);
	}
	/*
	 * Reset troff fonts.
	 */
	for (i = 0; i < 4; i++)
		strcpy(fonts[i], ifonts[i]);

	/*
	 *      read the control file for work to do
	 *
	 *      file format -- first character in the line is a command
	 *      rest of the line is the argument.
	 *      valid commands are:
	 *
	 *		J -- "job name" on banner page
	 *		C -- "class name" on banner page
	 *              L -- "literal" user's name to print on banner
	 *		T -- "title" for pr
	 *		H -- "host name" of machine where lpr was done
	 *              P -- "person" user's login name
	 *              I -- "indent" amount to indent output
	 *              f -- "file name" name of text file to print
	 *		l -- "file name" text file with control chars
	 *		p -- "file name" text file to print with pr(1)
	 *		t -- "file name" troff(1) file to print
	 *		n -- "file name" ditroff(1) file to print
	 *		d -- "file name" dvi file to print
	 *		g -- "file name" plot(1G) file to print
	 *		v -- "file name" plain raster file to print
	 *		c -- "file name" cifplot file to print
	 *		1 -- "R font file" for troff
	 *		2 -- "I font file" for troff
	 *		3 -- "B font file" for troff
	 *		4 -- "S font file" for troff
	 *		N -- "name" of file (used by lpq)
	 *              U -- "unlink" name of file to remove
	 *                    (after we print it. (Pass 2 only)).
	 *		M -- "mail" to user when done printing
	 *
	 *      getline reads a line and expands tabs to blanks
	 */

	/* pass 1 */

	while (getline(cfp))
		switch (line[0]) {
		case 'H':
			strcpy(fromhost, line+1);
			if (class[0] == '\0')
				strncpy(class, line+1, sizeof(class)-1);
			continue;

		case 'P':
			strncpy(logname, line+1, sizeof(logname)-1);
			if (RS) {			/* restricted */
				if (getpwnam(logname) == (struct passwd *)0) {
					bombed = 2;
					sendmail(line+1, bombed);
					goto pass2;
				}
			}
			continue;

		case 'J':
			if (line[1] != '\0')
				strncpy(jobname, line+1, sizeof(jobname)-1);
			else
				strcpy(jobname, " ");
			continue;

		case 'C':
			if (line[1] != '\0')
				strncpy(class, line+1, sizeof(class)-1);
			else if (class[0] == '\0')
				gethostname(class, sizeof(class));
			continue;

		case 'T':	/* header title for pr */
			strncpy(title, line+1, sizeof(title)-1);
			continue;

		case 'L':	/* identification line */
			if (!SH)
				banner(line+1, jobname);
			continue;

		case '1':	/* troff fonts */
		case '2':
		case '3':
		case '4':
			if (line[1] != '\0')
				strcpy(fonts[line[0]-'1'], line+1);
			continue;

		case 'W':	/* page width */
			strncpy(width+2, line+1, sizeof(width)-3);
			continue;

		case 'I':	/* indent amount */
			strncpy(indent+2, line+1, sizeof(indent)-3);
			continue;

		default:	/* some file to print */
			switch (i = print(line[0], line+1)) {
			case -1:
				if (!bombed)
					bombed = 1;
				break;
			case 1:
				(void) fclose(cfp);
				return(1);
			case 2:
				bombed = 3;
				sendmail(logname, bombed);
			}
			title[0] = '\0';
			continue;

		case 'N':
		case 'U':
		case 'M':
			continue;
		}

	/* pass 2 */

pass2:
	fseek(cfp, 0L, 0);
	while (getline(cfp))
		switch (line[0]) {
		case 'M':
			if (bombed < 2)		/* already sent if >= 2 */
				sendmail(line+1, bombed);
			continue;

		case 'U':
			(void) unlink(line+1);
		}
	/*
	 * clean-up in case another control file exists
	 */
	(void) fclose(cfp);
	(void) unlink(file);
	return(bombed ? -1 : 0);
}

/*
 * Print a file.
 * Set up the chain [ PR [ | {IF, OF} ] ] or {IF, RF, TF, NF, DF, CF, VF}.
 * Return -1 if a non-recoverable error occured,
 * 2 if the filter detected some errors (but printed the job anyway),
 * 1 if we should try to reprint this job and
 * 0 if all is well.
 * Note: all filters take stdin as the file, stdout as the printer,
 * stderr as the log file, and must not ignore SIGINT.
 */
static
print(format, file)
	int format;
	char *file;
{
	register int n;
	register char *prog;
	int fi, fo;
	char *av[15], buf[BUFSIZ];
	int pid, p[2], stopped = 0;
	union wait status;

	if ((fi = open(file, O_RDONLY)) < 0) {
		log("%s: open failure <errno = %d>", file, errno);
		return(-1);
	}
	if (!SF && !tof) {		/* start on a fresh page */
		(void) write(ofd, FF, strlen(FF));
		tof = 1;
	}
	if (IF == NULL && (format == 'f' || format == 'l')) {
		tof = 0;
		while ((n = read(fi, buf, BUFSIZ)) > 0)
			if (write(ofd, buf, n) != n) {
				(void) close(fi);
				return(1);
			}
		(void) close(fi);
		return(0);
	}
	switch (format) {
	case 'p':	/* print file using 'pr' */
		if (IF == NULL) {	/* use output filter */
			prog = PR;
			av[0] = "pr";
			av[1] = width;
			av[2] = length;
			av[3] = "-h";
			av[4] = *title ? title : " ";
			av[5] = 0;
			fo = ofd;
			goto start;
		}
		pipe(p);
		if ((prchild = dofork(DORETURN)) == 0) {	/* child */
			dup2(fi, 0);		/* file is stdin */
			dup2(p[1], 1);		/* pipe is stdout */
			for (n = 3; n < NOFILE; n++)
				(void) close(n);
			execl(PR, "pr", width, length, "-h", *title ? title : " ", 0);
			log("cannot execl %s", PR);
			exit(2);
		}
		(void) close(p[1]);		/* close output side */
		(void) close(fi);
		if (prchild < 0) {
			prchild = 0;
			(void) close(p[0]);
			return(-1);
		}
		fi = p[0];			/* use pipe for input */
	case 'f':	/* print plain text file */
		prog = IF;
		av[1] = width;
		av[2] = length;
		av[3] = indent;
		n = 4;
		break;
	case 'l':	/* like 'f' but pass control characters */
		prog = IF;
		av[1] = "-c";
		av[2] = width;
		av[3] = length;
		av[4] = indent;
		n = 5;
		break;
	case 'r':	/* print a fortran text file */
		prog = RF;
		av[1] = width;
		av[2] = length;
		n = 3;
		break;
	case 't':	/* print troff output */
	case 'n':	/* print ditroff output */
	case 'd':	/* print tex output */
		(void) unlink(".railmag");
		if ((fo = creat(".railmag", FILMOD)) < 0) {
			log("cannot create .railmag");
			(void) unlink(".railmag");
		} else {
			for (n = 0; n < 4; n++) {
				if (fonts[n][0] != '/')
					(void) write(fo, "/usr/lib/vfont/", 15);
				(void) write(fo, fonts[n], strlen(fonts[n]));
				(void) write(fo, "\n", 1);
			}
			(void) close(fo);
		}
		prog = (format == 't') ? TF : (format == 'n') ? NF : DF;
		av[1] = pxwidth;
		av[2] = pxlength;
		n = 3;
		break;
	case 'c':	/* print cifplot output */
		prog = CF;
		av[1] = pxwidth;
		av[2] = pxlength;
		n = 3;
		break;
	case 'g':	/* print plot(1G) output */
		prog = GF;
		av[1] = pxwidth;
		av[2] = pxlength;
		n = 3;
		break;
	case 'v':	/* print raster output */
		prog = VF;
		av[1] = pxwidth;
		av[2] = pxlength;
		n = 3;
		break;
	default:
		(void) close(fi);
		log("illegal format character '%c'", format);
		return(-1);
	}
	if ((av[0] = rindex(prog, '/')) != NULL)
		av[0]++;
	else
		av[0] = prog;
	av[n++] = "-n";
	av[n++] = logname;
	av[n++] = "-h";
	av[n++] = fromhost;
	av[n++] = AF;
	av[n] = 0;
	fo = pfd;
	if (ofilter > 0) {		/* stop output filter */
		write(ofd, "\031\1", 2);
		while ((pid = wait3(&status, WUNTRACED, 0)) > 0 && pid != ofilter)
			;
		if (status.w_stopval != WSTOPPED) {
			(void) close(fi);
			log("output filter died (%d)", status.w_retcode);
			return(1);
		}
		stopped++;
	}
start:
	if ((child = dofork(DORETURN)) == 0) {	/* child */
		dup2(fi, 0);
		dup2(fo, 1);
		n = open(tmpfile, O_WRONLY|O_CREAT, 0664);
		if (n >= 0)
			dup2(n, 2);
		for (n = 3; n < NOFILE; n++)
			(void) close(n);
		execv(prog, av);
		log("cannot execl %s", prog);
		exit(2);
	}
	(void) close(fi);
	if (child < 0)
		status.w_retcode = 100;
	else
		while ((pid = wait(&status)) > 0 && pid != child)
			;
	child = 0;
	prchild = 0;
	if (stopped) {		/* restart output filter */
		if (kill(ofilter, SIGCONT) < 0) {
			log("cannot restart output filter");
			exit(1);
		}
	}
	tof = 0;
	if (!WIFEXITED(status)) {
		log("Daemon filter '%c' terminated (%d)", format, status.w_termsig);
		return(-1);
	} else if (status.w_retcode > 2) {
		log("Daemon filter '%c' exited (%d)", format, status.w_retcode);
		return(-1);
	} else if (status.w_retcode == 0)
		tof = 1;
	return(status.w_retcode);
}

/*
 * Send the daemon control file (cf) and any data files.
 * Return -1 if a non-recoverable error occured, 1 if a recoverable error and
 * 0 if all is well.
 */
static
sendit(file)
	char *file;
{
	register int linelen, err = 0;
	char last[132];

	/*
	 * open control file
	 */
	if ((cfp = fopen(file, "r")) == NULL) {
		log("control file (%s) open failure <errno = %d>", file, errno);
		return(0);
	}
	/*
	 *      read the control file for work to do
	 *
	 *      file format -- first character in the line is a command
	 *      rest of the line is the argument.
	 *      commands of interest are:
	 *
	 *            a-z -- "file name" name of file to print
	 *              U -- "unlink" name of file to remove
	 *                    (after we print it. (Pass 2 only)).
	 */

	/*
	 * pass 1
	 */
	while (getline(cfp)) {
	again:
		if (line[0] >= 'a' && line[0] <= 'z') {
			strcpy(last, line);
			while (linelen = getline(cfp))
				if (strcmp(last, line))
					break;
			if ((err = sendfile('\3', last+1)) > 0) {
				(void) fclose(cfp);
				return(1);
			} else if (err)
				break;
			if (linelen)
				goto again;
			break;
		}
	}
	if (!err && sendfile('\2', file) > 0) {
		(void) fclose(cfp);
		return(1);
	}
	/*
	 * pass 2
	 */
	fseek(cfp, 0L, 0);
	while (getline(cfp))
		if (line[0] == 'U')
			(void) unlink(line+1);
	/*
	 * clean-up incase another control file exists
	 */
	(void) fclose(cfp);
	(void) unlink(file);
	return(0);
}

/*
 * Send a data file to the remote machine and spool it.
 * Return positive if we should try resending.
 */
static
sendfile(type, file)
	char type, *file;
{
	register int f, i, amt;
	struct stat stb;
	char buf[BUFSIZ];
	int sizerr;

	if ((f = open(file, O_RDONLY)) < 0 || fstat(f, &stb) < 0) {
		log("file (%s) open failure <errno = %d>", file, errno);
		return(-1);
	}
	(void) sprintf(buf, "%c%d %s\n", type, stb.st_size, file);
	amt = strlen(buf);
	if (write(pfd, buf, amt) != amt) {
		(void) close(f);
		return(1);
	}
	if (noresponse()) {
		(void) close(f);
		return(1);
	}
	sizerr = 0;
	for (i = 0; i < stb.st_size; i += BUFSIZ) {
		amt = BUFSIZ;
		if (i + amt > stb.st_size)
			amt = stb.st_size - i;
		if (sizerr == 0 && read(f, buf, amt) != amt)
			sizerr = 1;
		if (write(pfd, buf, amt) != amt) {
			(void) close(f);
			return(1);
		}
	}
	(void) close(f);
	if (sizerr) {
		log("%s: changed size", file);
		(void) write(pfd, "\1", 1);  /* tell recvjob to ignore this file */
		return(-1);
	}
	if (write(pfd, "", 1) != 1)
		return(1);
	if (noresponse())
		return(1);
	return(0);
}

/*
 * Check to make sure there have been no errors and that both programs
 * are in sync with eachother.
 * Return non-zero if the connection was lost.
 */
static
noresponse()
{
	char resp;

	if (read(pfd, &resp, 1) != 1 || resp != '\0') {
		log("lost connection or error in recvjob");
		return(1);
	}
	return(0);
}

/*
 * Banner printing stuff
 */
static
banner(name1, name2)
	char *name1, *name2;
{
	time_t tvec;
	extern char *ctime();

	time(&tvec);
	if (!SF && !tof)
		(void) write(ofd, FF, strlen(FF));
	if (SB) {	/* short banner only */
		if (class[0]) {
			(void) write(ofd, class, strlen(class));
			(void) write(ofd, ":", 1);
		}
		(void) write(ofd, name1, strlen(name1));
		(void) write(ofd, "  Job: ", 7);
		(void) write(ofd, name2, strlen(name2));
		(void) write(ofd, "  Date: ", 8);
		(void) write(ofd, ctime(&tvec), 24);
		(void) write(ofd, "\n", 1);
	} else {	/* normal banner */
		(void) write(ofd, "\n\n\n", 3);
		scan_out(ofd, name1, '\0');
		(void) write(ofd, "\n\n", 2);
		scan_out(ofd, name2, '\0');
		if (class[0]) {
			(void) write(ofd,"\n\n\n",3);
			scan_out(ofd, class, '\0');
		}
		(void) write(ofd, "\n\n\n\n\t\t\t\t\tJob:  ", 15);
		(void) write(ofd, name2, strlen(name2));
		(void) write(ofd, "\n\t\t\t\t\tDate: ", 12);
		(void) write(ofd, ctime(&tvec), 24);
		(void) write(ofd, "\n", 1);
	}
	if (!SF)
		(void) write(ofd, FF, strlen(FF));
	tof = 1;
}

static char *
scnline(key, p, c)
	register char key, *p;
	char c;
{
	register scnwidth;

	for (scnwidth = WIDTH; --scnwidth;) {
		key <<= 1;
		*p++ = key & 0200 ? c : BACKGND;
	}
	return (p);
}

#define TRC(q)	(((q)-' ')&0177)

static
scan_out(scfd, scsp, dlm)
	int scfd;
	char *scsp, dlm;
{
	register char *strp;
	register nchrs, j;
	char outbuf[LINELEN+1], *sp, c, cc;
	int d, scnhgt;
	extern char scnkey[][HEIGHT];	/* in lpdchar.c */

	for (scnhgt = 0; scnhgt++ < HEIGHT+DROP; ) {
		strp = &outbuf[0];
		sp = scsp;
		for (nchrs = 0; ; ) {
			d = dropit(c = TRC(cc = *sp++));
			if ((!d && scnhgt > HEIGHT) || (scnhgt <= DROP && d))
				for (j = WIDTH; --j;)
					*strp++ = BACKGND;
			else
				strp = scnline(scnkey[c][scnhgt-1-d], strp, cc);
			if (*sp == dlm || *sp == '\0' || nchrs++ >= PW/(WIDTH+1)-1)
				break;
			*strp++ = BACKGND;
			*strp++ = BACKGND;
		}
		while (*--strp == BACKGND && strp >= outbuf)
			;
		strp++;
		*strp++ = '\n';
		(void) write(scfd, outbuf, strp-outbuf);
	}
}

static
dropit(c)
	char c;
{
	switch(c) {

	case TRC('_'):
	case TRC(';'):
	case TRC(','):
	case TRC('g'):
	case TRC('j'):
	case TRC('p'):
	case TRC('q'):
	case TRC('y'):
		return (DROP);

	default:
		return (0);
	}
}

/*
 * sendmail ---
 *   tell people about job completion
 */
static
sendmail(user, bombed)
	char *user;
	int bombed;
{
	register int i;
	int p[2], s;
	register char *cp;
	char buf[100];
	struct stat stb;
	FILE *fp;

	pipe(p);
	if ((s = dofork(DORETURN)) == 0) {		/* child */
		dup2(p[0], 0);
		for (i = 3; i < NOFILE; i++)
			(void) close(i);
		if ((cp = rindex(MAIL, '/')) != NULL)
			cp++;
		else
			cp = MAIL;
		sprintf(buf, "%s@%s", user, fromhost);
		execl(MAIL, cp, buf, 0);
		exit(0);
	} else if (s > 0) {				/* parent */
		dup2(p[1], 1);
		printf("To: %s@%s\n", user, fromhost);
		printf("Subject: printer job\n\n");
		printf("Your printer job ");
		if (*jobname)
			printf("(%s) ", jobname);
		switch (bombed) {
		case 0:
			printf("\ncompleted successfully\n");
			break;
		default:
		case 1:
			printf("\ncould not be printed\n");
			break;
		case 2:
			printf("\ncould not be printed without an account on %s\n", host);
			break;
		case 3:
			if (stat(tmpfile, &stb) < 0 || stb.st_size == 0 ||
			    (fp = fopen(tmpfile, "r")) == NULL) {
				printf("\nwas printed but had some errors\n");
				break;
			}
			printf("\nwas printed but had the following errors:\n");
			while ((i = getc(fp)) != EOF)
				putchar(i);
			(void) fclose(fp);
		}
		fflush(stdout);
		(void) close(1);
	}
	(void) close(p[0]);
	(void) close(p[1]);
	wait(&s);
}

/*
 * dofork - fork with retries on failure
 */
static
dofork(action)
	int action;
{
	register int i, pid;

	for (i = 0; i < 20; i++) {
		if ((pid = fork()) < 0) {
			sleep((unsigned)(i*i));
			continue;
		}
		/*
		 * Child should run as daemon instead of root
		 */
		if (pid == 0)
			setuid(DU);
		return(pid);
	}
	log("can't fork");

	switch (action) {
	case DORETURN:
		return (-1);
	default:
		log("bad action (%d) to dofork", action);
		/*FALL THRU*/
	case DOABORT:
		exit(1);
	}
	/*NOTREACHED*/
}

/*
 * Cleanup child processes when a signal is caught.
 */
static
onintr()
{
	(void) unlink(tmpfile);
	kill(0, SIGINT);
	if (ofilter > 0)
		kill(ofilter, SIGCONT);
	while (wait(0) > 0)
		;
	exit(0);
}

static
init()
{
	int status;

	if ((status = pgetent(line, printer)) < 0)
		fatal("can't open printer description file");
	else if (status == 0)
		fatal("unknown printer");
	if ((LP = pgetstr("lp", &bp)) == NULL)
		LP = DEFDEVLP;
	if ((RP = pgetstr("rp", &bp)) == NULL)
		RP = DEFLP;
	if ((LO = pgetstr("lo", &bp)) == NULL)
		LO = DEFLOCK;
	if ((ST = pgetstr("st", &bp)) == NULL)
		ST = DEFSTAT;
	if ((LF = pgetstr("lf", &bp)) == NULL)
		LF = DEFLOGF;
	if ((SD = pgetstr("sd", &bp)) == NULL)
		SD = DEFSPOOL;
	if ((DU = pgetnum("du")) < 0)
		DU = DEFUID;
	if ((FF = pgetstr("ff", &bp)) == NULL)
		FF = DEFFF;
	if ((PW = pgetnum("pw")) < 0)
		PW = DEFWIDTH;
	sprintf(&width[2], "%d", PW);
	if ((PL = pgetnum("pl")) < 0)
		PL = DEFLENGTH;
	sprintf(&length[2], "%d", PL);
	if ((PX = pgetnum("px")) < 0)
		PX = 0;
	sprintf(&pxwidth[2], "%d", PX);
	if ((PY = pgetnum("py")) < 0)
		PY = 0;
	sprintf(&pxlength[2], "%d", PY);
	RM = pgetstr("rm", &bp);
	AF = pgetstr("af", &bp);
	OF = pgetstr("of", &bp);
	IF = pgetstr("if", &bp);
	RF = pgetstr("rf", &bp);
	TF = pgetstr("tf", &bp);
	NF = pgetstr("nf", &bp);
	DF = pgetstr("df", &bp);
	GF = pgetstr("gf", &bp);
	VF = pgetstr("vf", &bp);
	CF = pgetstr("cf", &bp);
	TR = pgetstr("tr", &bp);
	RS = pgetflag("rs");
	SF = pgetflag("sf");
	SH = pgetflag("sh");
	SB = pgetflag("sb");
	RW = pgetflag("rw");
	BR = pgetnum("br");
	if ((FC = pgetnum("fc")) < 0)
		FC = 0;
	if ((FS = pgetnum("fs")) < 0)
		FS = 0;
	if ((XC = pgetnum("xc")) < 0)
		XC = 0;
	if ((XS = pgetnum("xs")) < 0)
		XS = 0;
	tof = !pgetflag("fo");
}

/*
 * Acquire line printer or remote connection.
 */
static
openpr()
{
	register int i, n;

	if (*LP) {
		for (i = 1; ; i = i < 32 ? i << 1 : i) {
			pfd = open(LP, RW ? O_RDWR : O_WRONLY);
			if (pfd >= 0)
				break;
			if (errno == ENOENT) {
				log("cannot open %s", LP);
				exit(1);
			}
			if (i == 1)
				status("waiting for %s to become ready (offline ?)", printer);
			sleep(i);
		}
		if (isatty(pfd))
			setty();
		status("%s is ready and printing", printer);
	} else if (RM != NULL) {
		for (i = 1; ; i = i < 512 ? i << 1 : i) {
			pfd = getport(RM);
			if (pfd >= 0) {
				(void) sprintf(line, "\2%s\n", RP);
				n = strlen(line);
				if (write(pfd, line, n) != n)
					break;
				if (noresponse())
					(void) close(pfd);
				else
					break;
			}
			if (i == 1)
				status("waiting for %s to come up", RM);
			sleep(i);
		}
		status("sending to %s", RM);
		remote = 1;
	} else {
		log("no line printer device or remote machine name");
		exit(1);
	}
	/*
	 * Start up an output filter, if needed.
	 */
	if (OF) {
		int p[2];
		char *cp;

		pipe(p);
		if ((ofilter = dofork(DOABORT)) == 0) {	/* child */
			dup2(p[0], 0);		/* pipe is std in */
			dup2(pfd, 1);		/* printer is std out */
			for (i = 3; i < NOFILE; i++)
				(void) close(i);
			if ((cp = rindex(OF, '/')) == NULL)
				cp = OF;
			else
				cp++;
			execl(OF, cp, width, length, 0);
			log("can't execl output filter %s", OF);
			exit(1);
		}
		(void) close(p[0]);		/* close input side */
		ofd = p[1];			/* use pipe for output */
	} else {
		ofd = pfd;
		ofilter = 0;
	}
}

struct bauds {
	int	baud;
	int	speed;
} bauds[] = {
	50,	B50,
	75,	B75,
	110,	B110,
	134,	B134,
	150,	B150,
	200,	B200,
	300,	B300,
	600,	B600,
	1200,	B1200,
	1800,	B1800,
	2400,	B2400,
	4800,	B4800,
	9600,	B9600,
	19200,	EXTA,
	38400,	EXTB,
	0,	0
};

/*
 * setup tty lines.
 */
static
setty()
{
	struct sgttyb ttybuf;
	register struct bauds *bp;

	if (ioctl(pfd, TIOCEXCL, (char *)0) < 0) {
		log("cannot set exclusive-use");
		exit(1);
	}
	if (ioctl(pfd, TIOCGETP, (char *)&ttybuf) < 0) {
		log("cannot get tty parameters");
		exit(1);
	}
	if (BR > 0) {
		for (bp = bauds; bp->baud; bp++)
			if (BR == bp->baud)
				break;
		if (!bp->baud) {
			log("illegal baud rate %d", BR);
			exit(1);
		}
		ttybuf.sg_ispeed = ttybuf.sg_ospeed = bp->speed;
	}
	ttybuf.sg_flags &= ~FC;
	ttybuf.sg_flags |= FS;
	if (ioctl(pfd, TIOCSETP, (char *)&ttybuf) < 0) {
		log("cannot set tty parameters");
		exit(1);
	}
	if (XC) {
		if (ioctl(pfd, TIOCLBIC, &XC) < 0) {
			log("cannot set local tty parameters");
			exit(1);
		}
	}
	if (XS) {
		if (ioctl(pfd, TIOCLBIS, &XS) < 0) {
			log("cannot set local tty parameters");
			exit(1);
		}
	}
}

/*VARARGS1*/
static
status(msg, a1, a2, a3)
	char *msg;
{
	register int fd;
	char buf[BUFSIZ];

	umask(0);
	fd = open(ST, O_WRONLY|O_CREAT, 0664);
	if (fd < 0 || flock(fd, LOCK_EX) < 0)
		fatal("cannot create status file");
	ftruncate(fd, 0);
	sprintf(buf, msg, a1, a2, a3);
	strcat(buf, "\n");
	(void) write(fd, buf, strlen(buf));
	(void) close(fd);
}