src/rt/persist.c

#ifndef lint
static const char       RCSid[] = "$Id: persist.c,v 2.38 2006/06/07 17:52:04 schorsch Exp $";
#endif
/*
 * Routines for persistent rtrace and rpict processes.
 *
 *  External symbols declared in ray.h
 */

#include "copyright.h"

#include <string.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifndef NON_POSIX /* XXX need abstraction for process management */
 #include <sys/wait.h>
#endif

#include "platform.h"
#include "rtprocess.h" /* getpid() */
#include "standard.h"
#include "random.h"
#include "ray.h"

#ifdef F_SETLKW
#include "paths.h"
#include "selcall.h"

#ifndef TIMELIM
#define TIMELIM         (8*3600)        /* time limit for holding pattern */
#endif

extern int      headismine;     /* boolean true if header belongs to me */
extern char     *progname;      /* global program name */
extern char     *errfile;       /* global error file name */
static char     *persistfname = NULL;   /* persist file name */
static int      persistfd = -1;         /* persist file descriptor */
static char     inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1];

typedef void (sighandler_t)(int);
static sighandler_t sig_io;
static sighandler_t sig_alrm;


extern void
pfdetach(void)          /* release persist (and header) resources */
{
        if (persistfd >= 0)
                close(persistfd);
        persistfd = -1;
        persistfname = NULL;
        inpname[0] = '\0';
        outpname[0] = '\0';
        errname[0] = '\0';
        headismine = 0;
}


extern void
pfclean(void)           /* clean up persist files */
{
        if (persistfd >= 0)
                close(persistfd);
        if (persistfname != NULL)
                unlink(persistfname);
        if (inpname[0])
                unlink(inpname);
        if (outpname[0])
                unlink(outpname);
        if (errname[0])
                unlink(errname);
}


extern void
pflock(         /* place or release exclusive lock on file */
        int     lf
)
{
        struct flock    fls;

        fls.l_type = lf ? F_WRLCK : F_UNLCK;
        fls.l_whence = 0;
        fls.l_start = 0L;
        fls.l_len = 0L;
        if (fcntl(persistfd, F_SETLKW, &fls) < 0)
                error(SYSTEM, "cannot (un)lock persist file");
}


extern void
persistfile(    /* open persist file and lock it */
        char    *pfn
)
{
        persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0644);
        if (persistfd >= 0) {
                persistfname = pfn;
                pflock(1);
                return;
        }
                                /* file exists -- switch to i/o process */
        persistfd = open(pfn, O_RDWR);
        if (persistfd < 0) {
                sprintf(errmsg, "cannot open persist file \"%s\"", pfn);
                error(SYSTEM, errmsg);
        }
        pflock(1);
        io_process();   /* never returns */
}


static int      got_io;

static void sig_io(int i) { got_io++; }

static void sig_alrm(int i) { quit(0); }


extern void
pfhold(void)            /* holding pattern for idle rendering process */
{
        sighandler_t    *oldalrm;
        char    buf[512];
        register int    n;
                                /* close input and output descriptors */
        close(0);
        close(1);
        if (errfile == NULL)
                close(2);
                                /* create named pipes for input and output */
        if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0)
                goto createrr;
        if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0)
                goto createrr;
        if (errfile == NULL &&
                mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0)
                goto createrr;
        sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(),
                        inpname, outpname, errname);
        n = strlen(buf);
        if (write(persistfd, buf, n) < n)
                error(SYSTEM, "error writing persist file");
        lseek(persistfd, (off_t)0, SEEK_SET);
                                /* wait TIMELIM for someone to signal us */
        got_io = 0;
        signal(SIGIO, sig_io);
        oldalrm = signal(SIGALRM, sig_alrm);
        alarm(TIMELIM);
        pflock(0);                      /* unlock persist file for attach */
        while (!got_io)
                pause();                /* wait for attach */
        alarm(0);                       /* turn off alarm */
        signal(SIGALRM, oldalrm);
        signal(SIGIO, SIG_DFL);
        pflock(1);                      /* grab persist file back */
                                /* someone wants us; reopen stdin and stdout */
        /*
        if (freopen(inpname, "r", stdin) == NULL)
                goto openerr;
        if (freopen(outpname, "w", stdout) == NULL)
                goto openerr;
        */
        close(0);
        if (open(inpname, O_RDONLY) != 0)
                error(INTERNAL, "unexpected stdin file number");
        clearerr(stdin);
        close(1);
        if (open(outpname, O_WRONLY) != 1)
                error(INTERNAL, "unexpected stdout file number");
        sleep(3);               /* give them a chance to open their pipes */
        if (errname[0]) {
                close(2);
                if (open(errname, O_WRONLY) != 2)
                        error(INTERNAL, "unexpected stderr file number");
                unlink(errname);
                errname[0] = '\0';
        }
        unlink(inpname);
        inpname[0] = '\0';
        unlink(outpname);
        outpname[0] = '\0';
        return;
createrr:
        error(SYSTEM, "cannot create named pipes in pfhold");
openerr:
        error(SYSTEM, "cannot open named pipes in pfhold");
}


extern void
io_process(void)                /* just act as go-between for actual process */
{
        register char   *cp;
        register int    nr, n;
        char    buf[BUFSIZ], *pfin, *pfout, *pferr;
        int     pid, nfds;
        int     fdout, fderr = -1;
        int     status = 0;
        fd_set  readfds, excepfds;
                                        /* load persist file */
        n = 40;
        while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) {
                if (!n--)
                        error(USER, "unattended persist file?");
                pflock(0);
                sleep(3+(3*getpid()+random())%13);      /* wait until ready */
                pflock(1);
        }
        if (nr < 0)
                error(SYSTEM, "error reading persist file");
#ifndef _WIN32 /* XXX we need a replacement for that one */
        ftruncate(persistfd, (off_t)0L);        /* truncate persist file */
#endif
        pfdetach();                     /* close & release persist file */
        buf[nr] = '\0';                 /* parse what we got */
        if ((cp = strchr(buf, ' ')) == NULL)
                goto formerr;
        *cp++ = '\0';
        if ((pid = atoi(cp)) <= 0)
                goto formerr;
        if ((cp = strchr(cp, '\n')) == NULL)
                goto formerr;
        pfin = ++cp;
        if ((cp = strchr(cp, '\n')) == NULL)
                goto formerr;
        *cp++ = '\0';
        pfout = cp;
        if ((cp = strchr(cp, '\n')) == NULL)
                goto formerr;
        *cp++ = '\0';
        pferr = cp;
        if ((cp = strchr(cp, '\n')) == NULL)
                goto formerr;
        *cp++ = '\0';
        if (cp-buf != nr)
                goto formerr;
        if (strcmp(buf, progname)) {
                sprintf(errmsg, "persist file for %s, not %s", buf, progname);
                error(USER, errmsg);
        }
                                        /* wake up rendering process */
        if (kill(pid, SIGIO) < 0)
                error(SYSTEM, "cannot signal rendering process in io_process");
                                        /* fork child feeder process */
        pid = fork();
        if (pid < 0)
                error(SYSTEM, "fork failed in io_process");
        if (pid == 0) {                 /* feeder loop */
                int     fdin;
                close(1);               /* open input pipe */
                if ((fdin = open(pfin, O_WRONLY)) < 0)
                        error(SYSTEM, "cannot open feed pipe in io_process");
                                                /* renderer stdin */
                while ((nr = read(0, cp=buf, sizeof(buf))) > 0) {
                        do {
                                if ((n = write(fdin, cp, nr)) <= 0)
                                        goto writerr;
                                cp += n;
                        } while ((nr -= n) > 0);
                }
                if (nr < 0)
                        goto readerr;
                _exit(0);
        }
        close(0);
                                        /* open output pipes, in order */
        if ((fdout = open(pfout, O_RDONLY)) < 0)
                error(SYSTEM, "cannot open output pipe in io_process");
        if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0)
                error(SYSTEM, "cannot open error pipe in io_process");
        for ( ; ; ) {                   /* eater loop */
                FD_ZERO(&readfds);
                FD_ZERO(&excepfds);
                nfds = 0;
                if (fdout >= 0) {
                        FD_SET(fdout, &readfds);
                        FD_SET(fdout, &excepfds);
                        nfds = fdout+1;
                }
                if (fderr >= 0) {
                        FD_SET(fderr, &readfds);
                        FD_SET(fderr, &excepfds);
                        nfds = fderr+1;
                }
                if (nfds == 0)
                        break;                  /* all done, exit */
                if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0)
                        error(SYSTEM, "error in select call in io_process");
                                                /* renderer stderr */
                if (fderr >= 0 && (FD_ISSET(fderr, &readfds) ||
                                FD_ISSET(fderr, &excepfds))) {
                        nr = read(fderr, cp=buf, sizeof(buf));
                        if (nr < 0)
                                goto readerr;
                        if (nr == 0) {
                                close(fderr);
                                /* close(2);    don't close stderr! */
                                fderr = -1;
                        } else {
                                cp[nr] = '\0';  /* deduce status if we can */
                                n = strlen(progname);
                                if (!strncmp(cp, progname, n) &&
                                                cp[n++] == ':' &&
                                                cp[n++] == ' ') {
                                        register struct erract  *ep;
                                        for (ep = erract; ep < erract+NERRS;
                                                        ep++)
                                                if (ep->pre[0] &&
                                                        !strncmp(cp+n, ep->pre,
                                                            strlen(ep->pre))) {
                                                        status = ep->ec;
                                                        break;
                                                }
                                }
                                do {            /* write message */
                                        if ((n = write(2, cp, nr)) <= 0)
                                                goto writerr;
                                        cp += n;
                                } while ((nr -= n) > 0);
                        }
                }
                                                /* renderer stdout */
                if (fdout >= 0 && (FD_ISSET(fdout, &readfds) ||
                                FD_ISSET(fdout, &excepfds))) {
                        nr = read(fdout, cp=buf, sizeof(buf));
                        if (nr < 0)
                                goto readerr;
                        if (nr == 0) {          /* EOF */
                                close(fdout);
                                close(1);
                                fdout = -1;
                        } else
                                do {            /* write it all */
                                        if ((n = write(1, cp, nr)) <= 0)
                                                goto writerr;
                                        cp += n;
                                } while ((nr -= n) > 0);
                }
        }
        kill(pid, SIGTERM);     /* no more process to feed, so... */
        waitpid(pid, 0, 0);     /* wait for feeder process */
        _exit(status);
formerr:
        error(USER, "format error in persist file");
readerr:
        error(SYSTEM, "read error in io_process");
writerr:
        error(SYSTEM, "write error in io_process");
}

#else

extern void pfclean(void) {}

#endif
Revision:	2.39
Committed:	Mon Apr 21 07:31:30 2008 UTC (16 years ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.38:	+4 -2 lines
Log Message:	Scons update for mingw.
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.39	static const char RCSid[] = "$Id: persist.c,v 2.38 2006/06/07 17:52:04 schorsch Exp $";
3	greg	2.1	#endif
4			/*
5			* Routines for persistent rtrace and rpict processes.
6	greg	2.26	*
7			* External symbols declared in ray.h
8			*/
9
10	greg	2.27	#include "copyright.h"
11	greg	2.1
12	schorsch	2.29	#include <string.h>
13			#include <signal.h>
14			#include <sys/stat.h>
15	schorsch	2.38	#include <sys/types.h>
16	schorsch	2.39	#ifndef NON_POSIX /* XXX need abstraction for process management */
17			#include <sys/wait.h>
18			#endif
19	schorsch	2.29
20	greg	2.33	#include "platform.h"
21	schorsch	2.30	#include "rtprocess.h" /* getpid() */
22	greg	2.1	#include "standard.h"
23	gregl	2.25	#include "random.h"
24	schorsch	2.34	#include "ray.h"
25	greg	2.6
26			#ifdef F_SETLKW
27	greg	2.1	#include "paths.h"
28	gregl	2.21	#include "selcall.h"
29	greg	2.1
30	greg	2.2	#ifndef TIMELIM
31			#define TIMELIM (83600) / time limit for holding pattern */
32	greg	2.26	#endif
33
34	greg	2.1	extern int headismine; /* boolean true if header belongs to me */
35	greg	2.12	extern char progname; / global program name */
36	greg	2.14	extern char errfile; / global error file name */
37	greg	2.1	static char persistfname = NULL; / persist file name */
38			static int persistfd = -1; /* persist file descriptor */
39	schorsch	2.34	static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1];
40	greg	2.1
41	schorsch	2.34	typedef void (sighandler_t)(int);
42			static sighandler_t sig_io;
43			static sighandler_t sig_alrm;
44	greg	2.1
45
46	schorsch	2.34	extern void
47			pfdetach(void) /* release persist (and header) resources */
48	greg	2.1	{
49			if (persistfd >= 0)
50			close(persistfd);
51			persistfd = -1;
52			persistfname = NULL;
53			inpname[0] = '\0';
54			outpname[0] = '\0';
55	greg	2.14	errname[0] = '\0';
56	greg	2.1	headismine = 0;
57			}
58
59
60	schorsch	2.34	extern void
61			pfclean(void) /* clean up persist files */
62	greg	2.1	{
63			if (persistfd >= 0)
64			close(persistfd);
65			if (persistfname != NULL)
66			unlink(persistfname);
67			if (inpname[0])
68			unlink(inpname);
69			if (outpname[0])
70			unlink(outpname);
71	greg	2.14	if (errname[0])
72			unlink(errname);
73	greg	2.1	}
74
75
76	schorsch	2.34	extern void
77			pflock( /* place or release exclusive lock on file */
78			int lf
79			)
80	greg	2.1	{
81			struct flock fls;
82
83			fls.l_type = lf ? F_WRLCK : F_UNLCK;
84			fls.l_whence = 0;
85			fls.l_start = 0L;
86			fls.l_len = 0L;
87			if (fcntl(persistfd, F_SETLKW, &fls) < 0)
88			error(SYSTEM, "cannot (un)lock persist file");
89			}
90
91
92	schorsch	2.34	extern void
93			persistfile( /* open persist file and lock it */
94			char *pfn
95			)
96	greg	2.1	{
97	greg	2.13	persistfd = open(pfn, O_WRONLY\|O_CREAT\|O_EXCL, 0644);
98	greg	2.1	if (persistfd >= 0) {
99			persistfname = pfn;
100			pflock(1);
101			return;
102			}
103			/* file exists -- switch to i/o process */
104			persistfd = open(pfn, O_RDWR);
105			if (persistfd < 0) {
106			sprintf(errmsg, "cannot open persist file \"%s\"", pfn);
107			error(SYSTEM, errmsg);
108			}
109			pflock(1);
110			io_process(); /* never returns */
111			}
112
113
114	greg	2.13	static int got_io;
115	greg	2.1
116	schorsch	2.34	static void sig_io(int i) { got_io++; }
117	greg	2.1
118	schorsch	2.34	static void sig_alrm(int i) { quit(0); }
119	greg	2.13
120
121	schorsch	2.34	extern void
122			pfhold(void) /* holding pattern for idle rendering process */
123	greg	2.1	{
124	schorsch	2.34	sighandler_t *oldalrm;
125	greg	2.12	char buf[512];
126	greg	2.1	register int n;
127			/* close input and output descriptors */
128	greg	2.37	close(0);
129			close(1);
130	greg	2.16	if (errfile == NULL)
131	greg	2.37	close(2);
132	greg	2.1	/* create named pipes for input and output */
133	greg	2.26	if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0)
134	greg	2.1	goto createrr;
135	greg	2.26	if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0)
136	greg	2.1	goto createrr;
137	greg	2.14	if (errfile == NULL &&
138	greg	2.26	mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0)
139	greg	2.14	goto createrr;
140			sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(),
141			inpname, outpname, errname);
142	greg	2.1	n = strlen(buf);
143			if (write(persistfd, buf, n) < n)
144	greg	2.10	error(SYSTEM, "error writing persist file");
145	greg	2.32	lseek(persistfd, (off_t)0, SEEK_SET);
146	greg	2.2	/* wait TIMELIM for someone to signal us */
147	greg	2.13	got_io = 0;
148			signal(SIGIO, sig_io);
149	schorsch	2.34	oldalrm = signal(SIGALRM, sig_alrm);
150	greg	2.2	alarm(TIMELIM);
151	greg	2.15	pflock(0); /* unlock persist file for attach */
152	greg	2.13	while (!got_io)
153	greg	2.15	pause(); /* wait for attach */
154			alarm(0); /* turn off alarm */
155	greg	2.13	signal(SIGALRM, oldalrm);
156	greg	2.2	signal(SIGIO, SIG_DFL);
157	greg	2.17	pflock(1); /* grab persist file back */
158	greg	2.1	/* someone wants us; reopen stdin and stdout */
159	greg	2.26	/*
160	greg	2.1	if (freopen(inpname, "r", stdin) == NULL)
161			goto openerr;
162			if (freopen(outpname, "w", stdout) == NULL)
163			goto openerr;
164	greg	2.26	*/
165			close(0);
166			if (open(inpname, O_RDONLY) != 0)
167			error(INTERNAL, "unexpected stdin file number");
168			clearerr(stdin);
169			close(1);
170			if (open(outpname, O_WRONLY) != 1)
171			error(INTERNAL, "unexpected stdout file number");
172	gregl	2.22	sleep(3); /* give them a chance to open their pipes */
173	greg	2.14	if (errname[0]) {
174	greg	2.26	close(2);
175			if (open(errname, O_WRONLY) != 2)
176			error(INTERNAL, "unexpected stderr file number");
177	greg	2.14	unlink(errname);
178			errname[0] = '\0';
179			}
180	greg	2.1	unlink(inpname);
181			inpname[0] = '\0';
182			unlink(outpname);
183			outpname[0] = '\0';
184			return;
185			createrr:
186			error(SYSTEM, "cannot create named pipes in pfhold");
187			openerr:
188			error(SYSTEM, "cannot open named pipes in pfhold");
189			}
190
191
192	schorsch	2.34	extern void
193			io_process(void) /* just act as go-between for actual process */
194	greg	2.1	{
195			register char *cp;
196			register int nr, n;
197	greg	2.16	char buf[BUFSIZ], pfin, pfout, *pferr;
198			int pid, nfds;
199	gregl	2.22	int fdout, fderr = -1;
200	gregl	2.23	int status = 0;
201	gregl	2.22	fd_set readfds, excepfds;
202	greg	2.15	/* load persist file */
203	greg	2.17	n = 40;
204	greg	2.15	while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) {
205	greg	2.17	if (!n--)
206			error(USER, "unattended persist file?");
207	greg	2.15	pflock(0);
208	gregl	2.25	sleep(3+(3getpid()+random())%13); / wait until ready */
209	greg	2.15	pflock(1);
210			}
211			if (nr < 0)
212	greg	2.14	error(SYSTEM, "error reading persist file");
213	schorsch	2.28	#ifndef _WIN32 /* XXX we need a replacement for that one */
214	greg	2.26	ftruncate(persistfd, (off_t)0L); /* truncate persist file */
215	schorsch	2.28	#endif
216	greg	2.17	pfdetach(); /* close & release persist file */
217			buf[nr] = '\0'; /* parse what we got */
218	schorsch	2.29	if ((cp = strchr(buf, ' ')) == NULL)
219	greg	2.1	goto formerr;
220			*cp++ = '\0';
221	greg	2.12	if ((pid = atoi(cp)) <= 0)
222	greg	2.1	goto formerr;
223	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
224	greg	2.1	goto formerr;
225	greg	2.12	pfin = ++cp;
226	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
227	greg	2.12	goto formerr;
228	greg	2.1	*cp++ = '\0';
229			pfout = cp;
230	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
231	greg	2.1	goto formerr;
232			*cp++ = '\0';
233	greg	2.14	pferr = cp;
234	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
235	greg	2.14	goto formerr;
236			*cp++ = '\0';
237	greg	2.1	if (cp-buf != nr)
238			goto formerr;
239	greg	2.12	if (strcmp(buf, progname)) {
240			sprintf(errmsg, "persist file for %s, not %s", buf, progname);
241			error(USER, errmsg);
242			}
243	greg	2.16	/* wake up rendering process */
244	greg	2.2	if (kill(pid, SIGIO) < 0)
245	greg	2.1	error(SYSTEM, "cannot signal rendering process in io_process");
246	gregl	2.22	/* fork child feeder process */
247			pid = fork();
248			if (pid < 0)
249			error(SYSTEM, "fork failed in io_process");
250			if (pid == 0) { /* feeder loop */
251			int fdin;
252			close(1); /* open input pipe */
253			if ((fdin = open(pfin, O_WRONLY)) < 0)
254			error(SYSTEM, "cannot open feed pipe in io_process");
255			/* renderer stdin */
256			while ((nr = read(0, cp=buf, sizeof(buf))) > 0) {
257			do {
258			if ((n = write(fdin, cp, nr)) <= 0)
259			goto writerr;
260			cp += n;
261			} while ((nr -= n) > 0);
262			}
263			if (nr < 0)
264			goto readerr;
265			_exit(0);
266			}
267			close(0);
268			/* open output pipes, in order */
269	greg	2.16	if ((fdout = open(pfout, O_RDONLY)) < 0)
270			error(SYSTEM, "cannot open output pipe in io_process");
271			if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0)
272			error(SYSTEM, "cannot open error pipe in io_process");
273	gregl	2.22	for ( ; ; ) { /* eater loop */
274	greg	2.16	FD_ZERO(&readfds);
275			FD_ZERO(&excepfds);
276			nfds = 0;
277			if (fdout >= 0) {
278			FD_SET(fdout, &readfds);
279			FD_SET(fdout, &excepfds);
280			nfds = fdout+1;
281	greg	2.14	}
282	greg	2.16	if (fderr >= 0) {
283			FD_SET(fderr, &readfds);
284			FD_SET(fderr, &excepfds);
285			nfds = fderr+1;
286			}
287			if (nfds == 0)
288			break; /* all done, exit */
289	gregl	2.22	if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0)
290	greg	2.16	error(SYSTEM, "error in select call in io_process");
291			/* renderer stderr */
292			if (fderr >= 0 && (FD_ISSET(fderr, &readfds) \|\|
293			FD_ISSET(fderr, &excepfds))) {
294			nr = read(fderr, cp=buf, sizeof(buf));
295			if (nr < 0)
296			goto readerr;
297			if (nr == 0) {
298			close(fderr);
299	greg	2.18	/* close(2); don't close stderr! */
300	greg	2.16	fderr = -1;
301	gregl	2.24	} else {
302	gregl	2.23	cp[nr] = '\0'; /* deduce status if we can */
303			n = strlen(progname);
304			if (!strncmp(cp, progname, n) &&
305			cp[n++] == ':' &&
306			cp[n++] == ' ') {
307			register struct erract *ep;
308			for (ep = erract; ep < erract+NERRS;
309			ep++)
310			if (ep->pre[0] &&
311			!strncmp(cp+n, ep->pre,
312			strlen(ep->pre))) {
313			status = ep->ec;
314			break;
315			}
316			}
317			do { /* write message */
318	greg	2.16	if ((n = write(2, cp, nr)) <= 0)
319			goto writerr;
320			cp += n;
321			} while ((nr -= n) > 0);
322	gregl	2.24	}
323	greg	2.16	}
324			/* renderer stdout */
325			if (fdout >= 0 && (FD_ISSET(fdout, &readfds) \|\|
326			FD_ISSET(fdout, &excepfds))) {
327			nr = read(fdout, cp=buf, sizeof(buf));
328			if (nr < 0)
329			goto readerr;
330			if (nr == 0) { /* EOF */
331			close(fdout);
332			close(1);
333			fdout = -1;
334			} else
335			do { /* write it all */
336			if ((n = write(1, cp, nr)) <= 0)
337			goto writerr;
338			cp += n;
339			} while ((nr -= n) > 0);
340			}
341	greg	2.1	}
342	greg	2.36	kill(pid, SIGTERM); /* no more process to feed, so... */
343	greg	2.35	waitpid(pid, 0, 0); /* wait for feeder process */
344	gregl	2.23	_exit(status);
345	greg	2.1	formerr:
346			error(USER, "format error in persist file");
347	greg	2.16	readerr:
348			error(SYSTEM, "read error in io_process");
349			writerr:
350			error(SYSTEM, "write error in io_process");
351	greg	2.1	}
352	greg	2.6
353	greg	2.8	#else
354
355	schorsch	2.34	extern void pfclean(void) {}
356	greg	2.8
357	greg	2.6	#endif