src/rt/persist.c

#ifndef lint
static const char       RCSid[] = "$Id: persist.c,v 2.33 2003/10/22 02:06:35 greg 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 "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(fileno(stdin));
        close(fileno(stdout));
        if (errfile == NULL)
                close(fileno(stderr));
                                /* 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);
                }
        }
        wait(0);                /* wait for feeder process */ /* XXX platform */
        _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:	2.34
Committed:	Tue Mar 30 16:13:01 2004 UTC (20 years, 1 month ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.33:	+28 -27 lines
Log Message:	Continued ANSIfication. There are only bits and pieces left now.
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.34	static const char RCSid[] = "$Id: persist.c,v 2.33 2003/10/22 02:06:35 greg 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
16	greg	2.33	#include "platform.h"
17	schorsch	2.30	#include "rtprocess.h" /* getpid() */
18	greg	2.1	#include "standard.h"
19	gregl	2.25	#include "random.h"
20	schorsch	2.34	#include "ray.h"
21	greg	2.6
22			#ifdef F_SETLKW
23	greg	2.1	#include "paths.h"
24	gregl	2.21	#include "selcall.h"
25	greg	2.1
26	greg	2.2	#ifndef TIMELIM
27			#define TIMELIM (83600) / time limit for holding pattern */
28	greg	2.26	#endif
29
30	greg	2.1	extern int headismine; /* boolean true if header belongs to me */
31	greg	2.12	extern char progname; / global program name */
32	greg	2.14	extern char errfile; / global error file name */
33	greg	2.1	static char persistfname = NULL; / persist file name */
34			static int persistfd = -1; /* persist file descriptor */
35	schorsch	2.34	static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1];
36	greg	2.1
37	schorsch	2.34	typedef void (sighandler_t)(int);
38			static sighandler_t sig_io;
39			static sighandler_t sig_alrm;
40	greg	2.1
41
42	schorsch	2.34	extern void
43			pfdetach(void) /* release persist (and header) resources */
44	greg	2.1	{
45			if (persistfd >= 0)
46			close(persistfd);
47			persistfd = -1;
48			persistfname = NULL;
49			inpname[0] = '\0';
50			outpname[0] = '\0';
51	greg	2.14	errname[0] = '\0';
52	greg	2.1	headismine = 0;
53			}
54
55
56	schorsch	2.34	extern void
57			pfclean(void) /* clean up persist files */
58	greg	2.1	{
59			if (persistfd >= 0)
60			close(persistfd);
61			if (persistfname != NULL)
62			unlink(persistfname);
63			if (inpname[0])
64			unlink(inpname);
65			if (outpname[0])
66			unlink(outpname);
67	greg	2.14	if (errname[0])
68			unlink(errname);
69	greg	2.1	}
70
71
72	schorsch	2.34	extern void
73			pflock( /* place or release exclusive lock on file */
74			int lf
75			)
76	greg	2.1	{
77			struct flock fls;
78
79			fls.l_type = lf ? F_WRLCK : F_UNLCK;
80			fls.l_whence = 0;
81			fls.l_start = 0L;
82			fls.l_len = 0L;
83			if (fcntl(persistfd, F_SETLKW, &fls) < 0)
84			error(SYSTEM, "cannot (un)lock persist file");
85			}
86
87
88	schorsch	2.34	extern void
89			persistfile( /* open persist file and lock it */
90			char *pfn
91			)
92	greg	2.1	{
93	greg	2.13	persistfd = open(pfn, O_WRONLY\|O_CREAT\|O_EXCL, 0644);
94	greg	2.1	if (persistfd >= 0) {
95			persistfname = pfn;
96			pflock(1);
97			return;
98			}
99			/* file exists -- switch to i/o process */
100			persistfd = open(pfn, O_RDWR);
101			if (persistfd < 0) {
102			sprintf(errmsg, "cannot open persist file \"%s\"", pfn);
103			error(SYSTEM, errmsg);
104			}
105			pflock(1);
106			io_process(); /* never returns */
107			}
108
109
110	greg	2.13	static int got_io;
111	greg	2.1
112	schorsch	2.34	static void sig_io(int i) { got_io++; }
113	greg	2.1
114	schorsch	2.34	static void sig_alrm(int i) { quit(0); }
115	greg	2.13
116
117	schorsch	2.34	extern void
118			pfhold(void) /* holding pattern for idle rendering process */
119	greg	2.1	{
120	schorsch	2.34	sighandler_t *oldalrm;
121	greg	2.12	char buf[512];
122	greg	2.1	register int n;
123			/* close input and output descriptors */
124			close(fileno(stdin));
125			close(fileno(stdout));
126	greg	2.16	if (errfile == NULL)
127			close(fileno(stderr));
128	greg	2.1	/* create named pipes for input and output */
129	greg	2.26	if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0)
130	greg	2.1	goto createrr;
131	greg	2.26	if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0)
132	greg	2.1	goto createrr;
133	greg	2.14	if (errfile == NULL &&
134	greg	2.26	mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0)
135	greg	2.14	goto createrr;
136			sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(),
137			inpname, outpname, errname);
138	greg	2.1	n = strlen(buf);
139			if (write(persistfd, buf, n) < n)
140	greg	2.10	error(SYSTEM, "error writing persist file");
141	greg	2.32	lseek(persistfd, (off_t)0, SEEK_SET);
142	greg	2.2	/* wait TIMELIM for someone to signal us */
143	greg	2.13	got_io = 0;
144			signal(SIGIO, sig_io);
145	schorsch	2.34	oldalrm = signal(SIGALRM, sig_alrm);
146	greg	2.2	alarm(TIMELIM);
147	greg	2.15	pflock(0); /* unlock persist file for attach */
148	greg	2.13	while (!got_io)
149	greg	2.15	pause(); /* wait for attach */
150			alarm(0); /* turn off alarm */
151	greg	2.13	signal(SIGALRM, oldalrm);
152	greg	2.2	signal(SIGIO, SIG_DFL);
153	greg	2.17	pflock(1); /* grab persist file back */
154	greg	2.1	/* someone wants us; reopen stdin and stdout */
155	greg	2.26	/*
156	greg	2.1	if (freopen(inpname, "r", stdin) == NULL)
157			goto openerr;
158			if (freopen(outpname, "w", stdout) == NULL)
159			goto openerr;
160	greg	2.26	*/
161			close(0);
162			if (open(inpname, O_RDONLY) != 0)
163			error(INTERNAL, "unexpected stdin file number");
164			clearerr(stdin);
165			close(1);
166			if (open(outpname, O_WRONLY) != 1)
167			error(INTERNAL, "unexpected stdout file number");
168	gregl	2.22	sleep(3); /* give them a chance to open their pipes */
169	greg	2.14	if (errname[0]) {
170	greg	2.26	close(2);
171			if (open(errname, O_WRONLY) != 2)
172			error(INTERNAL, "unexpected stderr file number");
173	greg	2.14	unlink(errname);
174			errname[0] = '\0';
175			}
176	greg	2.1	unlink(inpname);
177			inpname[0] = '\0';
178			unlink(outpname);
179			outpname[0] = '\0';
180			return;
181			createrr:
182			error(SYSTEM, "cannot create named pipes in pfhold");
183			openerr:
184			error(SYSTEM, "cannot open named pipes in pfhold");
185			}
186
187
188	schorsch	2.34	extern void
189			io_process(void) /* just act as go-between for actual process */
190	greg	2.1	{
191			register char *cp;
192			register int nr, n;
193	greg	2.16	char buf[BUFSIZ], pfin, pfout, *pferr;
194			int pid, nfds;
195	gregl	2.22	int fdout, fderr = -1;
196	gregl	2.23	int status = 0;
197	gregl	2.22	fd_set readfds, excepfds;
198	greg	2.15	/* load persist file */
199	greg	2.17	n = 40;
200	greg	2.15	while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) {
201	greg	2.17	if (!n--)
202			error(USER, "unattended persist file?");
203	greg	2.15	pflock(0);
204	gregl	2.25	sleep(3+(3getpid()+random())%13); / wait until ready */
205	greg	2.15	pflock(1);
206			}
207			if (nr < 0)
208	greg	2.14	error(SYSTEM, "error reading persist file");
209	schorsch	2.28	#ifndef _WIN32 /* XXX we need a replacement for that one */
210	greg	2.26	ftruncate(persistfd, (off_t)0L); /* truncate persist file */
211	schorsch	2.28	#endif
212	greg	2.17	pfdetach(); /* close & release persist file */
213			buf[nr] = '\0'; /* parse what we got */
214	schorsch	2.29	if ((cp = strchr(buf, ' ')) == NULL)
215	greg	2.1	goto formerr;
216			*cp++ = '\0';
217	greg	2.12	if ((pid = atoi(cp)) <= 0)
218	greg	2.1	goto formerr;
219	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
220	greg	2.1	goto formerr;
221	greg	2.12	pfin = ++cp;
222	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
223	greg	2.12	goto formerr;
224	greg	2.1	*cp++ = '\0';
225			pfout = cp;
226	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
227	greg	2.1	goto formerr;
228			*cp++ = '\0';
229	greg	2.14	pferr = cp;
230	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
231	greg	2.14	goto formerr;
232			*cp++ = '\0';
233	greg	2.1	if (cp-buf != nr)
234			goto formerr;
235	greg	2.12	if (strcmp(buf, progname)) {
236			sprintf(errmsg, "persist file for %s, not %s", buf, progname);
237			error(USER, errmsg);
238			}
239	greg	2.16	/* wake up rendering process */
240	greg	2.2	if (kill(pid, SIGIO) < 0)
241	greg	2.1	error(SYSTEM, "cannot signal rendering process in io_process");
242	gregl	2.22	/* fork child feeder process */
243			pid = fork();
244			if (pid < 0)
245			error(SYSTEM, "fork failed in io_process");
246			if (pid == 0) { /* feeder loop */
247			int fdin;
248			close(1); /* open input pipe */
249			if ((fdin = open(pfin, O_WRONLY)) < 0)
250			error(SYSTEM, "cannot open feed pipe in io_process");
251			/* renderer stdin */
252			while ((nr = read(0, cp=buf, sizeof(buf))) > 0) {
253			do {
254			if ((n = write(fdin, cp, nr)) <= 0)
255			goto writerr;
256			cp += n;
257			} while ((nr -= n) > 0);
258			}
259			if (nr < 0)
260			goto readerr;
261			_exit(0);
262			}
263			close(0);
264			/* open output pipes, in order */
265	greg	2.16	if ((fdout = open(pfout, O_RDONLY)) < 0)
266			error(SYSTEM, "cannot open output pipe in io_process");
267			if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0)
268			error(SYSTEM, "cannot open error pipe in io_process");
269	gregl	2.22	for ( ; ; ) { /* eater loop */
270	greg	2.16	FD_ZERO(&readfds);
271			FD_ZERO(&excepfds);
272			nfds = 0;
273			if (fdout >= 0) {
274			FD_SET(fdout, &readfds);
275			FD_SET(fdout, &excepfds);
276			nfds = fdout+1;
277	greg	2.14	}
278	greg	2.16	if (fderr >= 0) {
279			FD_SET(fderr, &readfds);
280			FD_SET(fderr, &excepfds);
281			nfds = fderr+1;
282			}
283			if (nfds == 0)
284			break; /* all done, exit */
285	gregl	2.22	if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0)
286	greg	2.16	error(SYSTEM, "error in select call in io_process");
287			/* renderer stderr */
288			if (fderr >= 0 && (FD_ISSET(fderr, &readfds) \|\|
289			FD_ISSET(fderr, &excepfds))) {
290			nr = read(fderr, cp=buf, sizeof(buf));
291			if (nr < 0)
292			goto readerr;
293			if (nr == 0) {
294			close(fderr);
295	greg	2.18	/* close(2); don't close stderr! */
296	greg	2.16	fderr = -1;
297	gregl	2.24	} else {
298	gregl	2.23	cp[nr] = '\0'; /* deduce status if we can */
299			n = strlen(progname);
300			if (!strncmp(cp, progname, n) &&
301			cp[n++] == ':' &&
302			cp[n++] == ' ') {
303			register struct erract *ep;
304			for (ep = erract; ep < erract+NERRS;
305			ep++)
306			if (ep->pre[0] &&
307			!strncmp(cp+n, ep->pre,
308			strlen(ep->pre))) {
309			status = ep->ec;
310			break;
311			}
312			}
313			do { /* write message */
314	greg	2.16	if ((n = write(2, cp, nr)) <= 0)
315			goto writerr;
316			cp += n;
317			} while ((nr -= n) > 0);
318	gregl	2.24	}
319	greg	2.16	}
320			/* renderer stdout */
321			if (fdout >= 0 && (FD_ISSET(fdout, &readfds) \|\|
322			FD_ISSET(fdout, &excepfds))) {
323			nr = read(fdout, cp=buf, sizeof(buf));
324			if (nr < 0)
325			goto readerr;
326			if (nr == 0) { /* EOF */
327			close(fdout);
328			close(1);
329			fdout = -1;
330			} else
331			do { /* write it all */
332			if ((n = write(1, cp, nr)) <= 0)
333			goto writerr;
334			cp += n;
335			} while ((nr -= n) > 0);
336			}
337	greg	2.1	}
338	schorsch	2.34	wait(0); /* wait for feeder process / / XXX platform */
339	gregl	2.23	_exit(status);
340	greg	2.1	formerr:
341			error(USER, "format error in persist file");
342	greg	2.16	readerr:
343			error(SYSTEM, "read error in io_process");
344			writerr:
345			error(SYSTEM, "write error in io_process");
346	greg	2.1	}
347	greg	2.6
348	greg	2.8	#else
349
350	schorsch	2.34	extern void pfclean(void) {}
351	greg	2.8
352	greg	2.6	#endif