src/rt/persist.c

#ifndef lint
static const char       RCSid[] = "$Id: persist.c,v 2.43 2013/11/08 18:08:07 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 <sys/types.h>

#include "platform.h"
#ifndef NON_POSIX /* XXX need abstraction for process management */
 #include <sys/wait.h>
#endif

#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 (rsighandler_t)(int);
static rsighandler_t sig_io;
static rsighandler_t sig_alrm;


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;
}


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);
}


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");
}


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); }


void
pfhold(void)            /* holding pattern for idle rendering process */
{
        rsighandler_t   *oldalrm;
        char    buf[512];
        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 */
        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");
}


void
io_process(void)                /* just act as go-between for actual process */
{
        char    *cp;
        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");
        ftruncate(persistfd, (off_t)0L);        /* truncate persist file */
        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++] == ' ') {
                                        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

void pfclean(void) {}

#endif
Revision:	2.44
Committed:	Sun Mar 6 01:13:18 2016 UTC (8 years, 2 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R4, rad5R2, rad5R1, rad5R3, HEAD
Changes since 2.43:	+1 -3 lines
Log Message:	Prepare for SCons build on Win32 and Win64
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	schorsch	2.44	static const char RCSid[] = "$Id: persist.c,v 2.43 2013/11/08 18:08:07 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	schorsch	2.38	#include <sys/types.h>
16	schorsch	2.40
17			#include "platform.h"
18	schorsch	2.39	#ifndef NON_POSIX /* XXX need abstraction for process management */
19			#include <sys/wait.h>
20			#endif
21	schorsch	2.29
22	schorsch	2.30	#include "rtprocess.h" /* getpid() */
23	greg	2.1	#include "standard.h"
24	gregl	2.25	#include "random.h"
25	schorsch	2.34	#include "ray.h"
26	greg	2.6
27			#ifdef F_SETLKW
28	greg	2.1	#include "paths.h"
29	gregl	2.21	#include "selcall.h"
30	greg	2.1
31	greg	2.2	#ifndef TIMELIM
32			#define TIMELIM (83600) / time limit for holding pattern */
33	greg	2.26	#endif
34
35	greg	2.1	extern int headismine; /* boolean true if header belongs to me */
36	greg	2.12	extern char progname; / global program name */
37	greg	2.14	extern char errfile; / global error file name */
38	greg	2.1	static char persistfname = NULL; / persist file name */
39			static int persistfd = -1; /* persist file descriptor */
40	schorsch	2.34	static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1];
41	greg	2.1
42	greg	2.42	typedef void (rsighandler_t)(int);
43			static rsighandler_t sig_io;
44			static rsighandler_t sig_alrm;
45	greg	2.1
46
47	greg	2.43	void
48	schorsch	2.34	pfdetach(void) /* release persist (and header) resources */
49	greg	2.1	{
50			if (persistfd >= 0)
51			close(persistfd);
52			persistfd = -1;
53			persistfname = NULL;
54			inpname[0] = '\0';
55			outpname[0] = '\0';
56	greg	2.14	errname[0] = '\0';
57	greg	2.1	headismine = 0;
58			}
59
60
61	greg	2.43	void
62	schorsch	2.34	pfclean(void) /* clean up persist files */
63	greg	2.1	{
64			if (persistfd >= 0)
65			close(persistfd);
66			if (persistfname != NULL)
67			unlink(persistfname);
68			if (inpname[0])
69			unlink(inpname);
70			if (outpname[0])
71			unlink(outpname);
72	greg	2.14	if (errname[0])
73			unlink(errname);
74	greg	2.1	}
75
76
77	greg	2.43	void
78	schorsch	2.34	pflock( /* place or release exclusive lock on file */
79			int lf
80			)
81	greg	2.1	{
82			struct flock fls;
83
84			fls.l_type = lf ? F_WRLCK : F_UNLCK;
85			fls.l_whence = 0;
86			fls.l_start = 0L;
87			fls.l_len = 0L;
88			if (fcntl(persistfd, F_SETLKW, &fls) < 0)
89			error(SYSTEM, "cannot (un)lock persist file");
90			}
91
92
93	greg	2.43	void
94	schorsch	2.34	persistfile( /* open persist file and lock it */
95			char *pfn
96			)
97	greg	2.1	{
98	greg	2.13	persistfd = open(pfn, O_WRONLY\|O_CREAT\|O_EXCL, 0644);
99	greg	2.1	if (persistfd >= 0) {
100			persistfname = pfn;
101			pflock(1);
102			return;
103			}
104			/* file exists -- switch to i/o process */
105			persistfd = open(pfn, O_RDWR);
106			if (persistfd < 0) {
107			sprintf(errmsg, "cannot open persist file \"%s\"", pfn);
108			error(SYSTEM, errmsg);
109			}
110			pflock(1);
111			io_process(); /* never returns */
112			}
113
114
115	greg	2.13	static int got_io;
116	greg	2.1
117	schorsch	2.34	static void sig_io(int i) { got_io++; }
118	greg	2.1
119	schorsch	2.34	static void sig_alrm(int i) { quit(0); }
120	greg	2.13
121
122	greg	2.43	void
123	schorsch	2.34	pfhold(void) /* holding pattern for idle rendering process */
124	greg	2.1	{
125	greg	2.42	rsighandler_t *oldalrm;
126	greg	2.12	char buf[512];
127	greg	2.43	int n;
128	greg	2.1	/* close input and output descriptors */
129	greg	2.37	close(0);
130			close(1);
131	greg	2.16	if (errfile == NULL)
132	greg	2.37	close(2);
133	greg	2.1	/* create named pipes for input and output */
134	greg	2.26	if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0)
135	greg	2.1	goto createrr;
136	greg	2.26	if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0)
137	greg	2.1	goto createrr;
138	greg	2.14	if (errfile == NULL &&
139	greg	2.26	mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0)
140	greg	2.14	goto createrr;
141			sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(),
142			inpname, outpname, errname);
143	greg	2.1	n = strlen(buf);
144			if (write(persistfd, buf, n) < n)
145	greg	2.10	error(SYSTEM, "error writing persist file");
146	greg	2.32	lseek(persistfd, (off_t)0, SEEK_SET);
147	greg	2.2	/* wait TIMELIM for someone to signal us */
148	greg	2.13	got_io = 0;
149			signal(SIGIO, sig_io);
150	schorsch	2.34	oldalrm = signal(SIGALRM, sig_alrm);
151	greg	2.2	alarm(TIMELIM);
152	greg	2.15	pflock(0); /* unlock persist file for attach */
153	greg	2.13	while (!got_io)
154	greg	2.15	pause(); /* wait for attach */
155			alarm(0); /* turn off alarm */
156	greg	2.13	signal(SIGALRM, oldalrm);
157	greg	2.2	signal(SIGIO, SIG_DFL);
158	greg	2.17	pflock(1); /* grab persist file back */
159	greg	2.1	/* someone wants us; reopen stdin and stdout */
160	greg	2.26	close(0);
161			if (open(inpname, O_RDONLY) != 0)
162			error(INTERNAL, "unexpected stdin file number");
163			clearerr(stdin);
164			close(1);
165			if (open(outpname, O_WRONLY) != 1)
166			error(INTERNAL, "unexpected stdout file number");
167	gregl	2.22	sleep(3); /* give them a chance to open their pipes */
168	greg	2.14	if (errname[0]) {
169	greg	2.26	close(2);
170			if (open(errname, O_WRONLY) != 2)
171			error(INTERNAL, "unexpected stderr file number");
172	greg	2.14	unlink(errname);
173			errname[0] = '\0';
174			}
175	greg	2.1	unlink(inpname);
176			inpname[0] = '\0';
177			unlink(outpname);
178			outpname[0] = '\0';
179			return;
180			createrr:
181			error(SYSTEM, "cannot create named pipes in pfhold");
182			}
183
184
185	greg	2.43	void
186	schorsch	2.34	io_process(void) /* just act as go-between for actual process */
187	greg	2.1	{
188	greg	2.43	char *cp;
189			int nr, n;
190	greg	2.16	char buf[BUFSIZ], pfin, pfout, *pferr;
191			int pid, nfds;
192	gregl	2.22	int fdout, fderr = -1;
193	gregl	2.23	int status = 0;
194	gregl	2.22	fd_set readfds, excepfds;
195	greg	2.15	/* load persist file */
196	greg	2.17	n = 40;
197	greg	2.15	while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) {
198	greg	2.17	if (!n--)
199			error(USER, "unattended persist file?");
200	greg	2.15	pflock(0);
201	gregl	2.25	sleep(3+(3getpid()+random())%13); / wait until ready */
202	greg	2.15	pflock(1);
203			}
204			if (nr < 0)
205	greg	2.14	error(SYSTEM, "error reading persist file");
206	greg	2.26	ftruncate(persistfd, (off_t)0L); /* truncate persist file */
207	greg	2.17	pfdetach(); /* close & release persist file */
208			buf[nr] = '\0'; /* parse what we got */
209	schorsch	2.29	if ((cp = strchr(buf, ' ')) == NULL)
210	greg	2.1	goto formerr;
211			*cp++ = '\0';
212	greg	2.12	if ((pid = atoi(cp)) <= 0)
213	greg	2.1	goto formerr;
214	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
215	greg	2.1	goto formerr;
216	greg	2.12	pfin = ++cp;
217	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
218	greg	2.12	goto formerr;
219	greg	2.1	*cp++ = '\0';
220			pfout = cp;
221	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
222	greg	2.1	goto formerr;
223			*cp++ = '\0';
224	greg	2.14	pferr = cp;
225	schorsch	2.29	if ((cp = strchr(cp, '\n')) == NULL)
226	greg	2.14	goto formerr;
227			*cp++ = '\0';
228	greg	2.1	if (cp-buf != nr)
229			goto formerr;
230	greg	2.12	if (strcmp(buf, progname)) {
231			sprintf(errmsg, "persist file for %s, not %s", buf, progname);
232			error(USER, errmsg);
233			}
234	greg	2.16	/* wake up rendering process */
235	greg	2.2	if (kill(pid, SIGIO) < 0)
236	greg	2.1	error(SYSTEM, "cannot signal rendering process in io_process");
237	gregl	2.22	/* fork child feeder process */
238			pid = fork();
239			if (pid < 0)
240			error(SYSTEM, "fork failed in io_process");
241			if (pid == 0) { /* feeder loop */
242			int fdin;
243			close(1); /* open input pipe */
244			if ((fdin = open(pfin, O_WRONLY)) < 0)
245			error(SYSTEM, "cannot open feed pipe in io_process");
246			/* renderer stdin */
247			while ((nr = read(0, cp=buf, sizeof(buf))) > 0) {
248			do {
249			if ((n = write(fdin, cp, nr)) <= 0)
250			goto writerr;
251			cp += n;
252			} while ((nr -= n) > 0);
253			}
254			if (nr < 0)
255			goto readerr;
256			_exit(0);
257			}
258			close(0);
259			/* open output pipes, in order */
260	greg	2.16	if ((fdout = open(pfout, O_RDONLY)) < 0)
261			error(SYSTEM, "cannot open output pipe in io_process");
262			if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0)
263			error(SYSTEM, "cannot open error pipe in io_process");
264	gregl	2.22	for ( ; ; ) { /* eater loop */
265	greg	2.16	FD_ZERO(&readfds);
266			FD_ZERO(&excepfds);
267			nfds = 0;
268			if (fdout >= 0) {
269			FD_SET(fdout, &readfds);
270			FD_SET(fdout, &excepfds);
271			nfds = fdout+1;
272	greg	2.14	}
273	greg	2.16	if (fderr >= 0) {
274			FD_SET(fderr, &readfds);
275			FD_SET(fderr, &excepfds);
276			nfds = fderr+1;
277			}
278			if (nfds == 0)
279			break; /* all done, exit */
280	gregl	2.22	if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0)
281	greg	2.16	error(SYSTEM, "error in select call in io_process");
282			/* renderer stderr */
283			if (fderr >= 0 && (FD_ISSET(fderr, &readfds) \|\|
284			FD_ISSET(fderr, &excepfds))) {
285			nr = read(fderr, cp=buf, sizeof(buf));
286			if (nr < 0)
287			goto readerr;
288			if (nr == 0) {
289			close(fderr);
290	greg	2.18	/* close(2); don't close stderr! */
291	greg	2.16	fderr = -1;
292	gregl	2.24	} else {
293	gregl	2.23	cp[nr] = '\0'; /* deduce status if we can */
294			n = strlen(progname);
295			if (!strncmp(cp, progname, n) &&
296			cp[n++] == ':' &&
297			cp[n++] == ' ') {
298	greg	2.43	struct erract *ep;
299	gregl	2.23	for (ep = erract; ep < erract+NERRS;
300			ep++)
301			if (ep->pre[0] &&
302			!strncmp(cp+n, ep->pre,
303			strlen(ep->pre))) {
304			status = ep->ec;
305			break;
306			}
307			}
308			do { /* write message */
309	greg	2.16	if ((n = write(2, cp, nr)) <= 0)
310			goto writerr;
311			cp += n;
312			} while ((nr -= n) > 0);
313	gregl	2.24	}
314	greg	2.16	}
315			/* renderer stdout */
316			if (fdout >= 0 && (FD_ISSET(fdout, &readfds) \|\|
317			FD_ISSET(fdout, &excepfds))) {
318			nr = read(fdout, cp=buf, sizeof(buf));
319			if (nr < 0)
320			goto readerr;
321			if (nr == 0) { /* EOF */
322			close(fdout);
323			close(1);
324			fdout = -1;
325			} else
326			do { /* write it all */
327			if ((n = write(1, cp, nr)) <= 0)
328			goto writerr;
329			cp += n;
330			} while ((nr -= n) > 0);
331			}
332	greg	2.1	}
333	greg	2.36	kill(pid, SIGTERM); /* no more process to feed, so... */
334	greg	2.35	waitpid(pid, 0, 0); /* wait for feeder process */
335	gregl	2.23	_exit(status);
336	greg	2.1	formerr:
337			error(USER, "format error in persist file");
338	greg	2.16	readerr:
339			error(SYSTEM, "read error in io_process");
340			writerr:
341			error(SYSTEM, "write error in io_process");
342	greg	2.1	}
343	greg	2.6
344	greg	2.8	#else
345
346	greg	2.43	void pfclean(void) {}
347	greg	2.8
348	greg	2.6	#endif