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/* Copyright (c) 1993 Regents of the University of California */ |
2 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
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|
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/* |
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* Routines for persistent rtrace and rpict processes. |
6 |
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* |
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* External symbols declared in ray.h |
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*/ |
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|
10 |
< |
#include "standard.h" |
11 |
< |
#include "paths.h" |
10 |
> |
#include "copyright.h" |
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> |
|
12 |
> |
#include <string.h> |
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#include <signal.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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|
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#include "platform.h" |
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#include "rtprocess.h" /* getpid() */ |
18 |
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#include "standard.h" |
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#include "random.h" |
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|
21 |
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#ifdef F_SETLKW |
22 |
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#include "paths.h" |
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#include "selcall.h" |
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|
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#ifndef TIMELIM |
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#define TIMELIM (8*3600) /* time limit for holding pattern */ |
27 |
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#endif |
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|
29 |
< |
extern char *strcpy(), *index(); |
29 |
> |
extern void io_process(); |
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|
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extern int headismine; /* boolean true if header belongs to me */ |
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|
33 |
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extern char *progname; /* global program name */ |
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|
35 |
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extern char *errfile; /* global error file name */ |
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|
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static char *persistfname = NULL; /* persist file name */ |
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static int persistfd = -1; /* persist file descriptor */ |
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|
40 |
< |
static char inpname[TEMPLEN+1], outpname[TEMPLEN+1]; |
40 |
> |
static char inpname[TEMPLEN+1], outpname[TEMPLEN+1], errname[TEMPLEN+1]; |
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|
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|
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+ |
void |
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pfdetach() /* release persist (and header) resources */ |
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{ |
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if (persistfd >= 0) |
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persistfname = NULL; |
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inpname[0] = '\0'; |
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outpname[0] = '\0'; |
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errname[0] = '\0'; |
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headismine = 0; |
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} |
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|
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|
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void |
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pfclean() /* clean up persist files */ |
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{ |
60 |
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if (persistfd >= 0) |
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unlink(inpname); |
66 |
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if (outpname[0]) |
67 |
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unlink(outpname); |
68 |
+ |
if (errname[0]) |
69 |
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unlink(errname); |
70 |
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} |
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|
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73 |
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void |
74 |
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pflock(lf) /* place or release exclusive lock on file */ |
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int lf; |
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{ |
85 |
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} |
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|
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|
88 |
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void |
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persistfile(pfn) /* open persist file and lock it */ |
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char *pfn; |
91 |
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{ |
92 |
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persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0666); |
92 |
> |
persistfd = open(pfn, O_WRONLY|O_CREAT|O_EXCL, 0644); |
93 |
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if (persistfd >= 0) { |
94 |
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persistfname = pfn; |
95 |
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pflock(1); |
106 |
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} |
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108 |
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|
109 |
< |
int sig_noop() {} |
109 |
> |
static int got_io; |
110 |
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|
111 |
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static void sig_io() { got_io++; } |
112 |
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|
113 |
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static void sig_alrm() { quit(0); } |
114 |
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|
115 |
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|
116 |
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void |
117 |
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pfhold() /* holding pattern for idle rendering process */ |
118 |
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{ |
119 |
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char buf[128]; |
119 |
> |
void (*oldalrm)(); |
120 |
> |
char buf[512]; |
121 |
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register int n; |
122 |
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/* close input and output descriptors */ |
123 |
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close(fileno(stdin)); |
99 |
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fflush(stdout); |
124 |
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close(fileno(stdout)); |
125 |
+ |
if (errfile == NULL) |
126 |
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close(fileno(stderr)); |
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/* create named pipes for input and output */ |
128 |
< |
if (mknod(mktemp(strcpy(inpname,TEMPLATE)), S_IFIFO|0600) < 0) |
128 |
> |
if (mkfifo(mktemp(strcpy(inpname,TEMPLATE)), 0600) < 0) |
129 |
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goto createrr; |
130 |
< |
if (mknod(mktemp(strcpy(outpname,TEMPLATE)), S_IFIFO|0600) < 0) |
130 |
> |
if (mkfifo(mktemp(strcpy(outpname,TEMPLATE)), 0600) < 0) |
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goto createrr; |
132 |
< |
sprintf(buf, "%d\n%s\n%s\n", getpid(), inpname, outpname); |
133 |
< |
if (lseek(persistfd, 0L, 0) < 0) |
134 |
< |
error(SYSTEM, "seek error on persist file in pfhold"); |
132 |
> |
if (errfile == NULL && |
133 |
> |
mkfifo(mktemp(strcpy(errname,TEMPLATE)), 0600) < 0) |
134 |
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goto createrr; |
135 |
> |
sprintf(buf, "%s %d\n%s\n%s\n%s\n", progname, getpid(), |
136 |
> |
inpname, outpname, errname); |
137 |
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n = strlen(buf); |
138 |
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if (write(persistfd, buf, n) < n) |
139 |
< |
error(SYSTEM, "error writing persist file in pfhold"); |
139 |
> |
error(SYSTEM, "error writing persist file"); |
140 |
> |
lseek(persistfd, (off_t)0, SEEK_SET); |
141 |
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/* wait TIMELIM for someone to signal us */ |
142 |
< |
signal(SIGIO, sig_noop); |
142 |
> |
got_io = 0; |
143 |
> |
signal(SIGIO, sig_io); |
144 |
> |
oldalrm = (void (*)())signal(SIGALRM, sig_alrm); |
145 |
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alarm(TIMELIM); |
146 |
< |
pflock(0); |
147 |
< |
pause(); |
148 |
< |
alarm(0); |
146 |
> |
pflock(0); /* unlock persist file for attach */ |
147 |
> |
while (!got_io) |
148 |
> |
pause(); /* wait for attach */ |
149 |
> |
alarm(0); /* turn off alarm */ |
150 |
> |
signal(SIGALRM, oldalrm); |
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signal(SIGIO, SIG_DFL); |
152 |
< |
pflock(1); |
152 |
> |
pflock(1); /* grab persist file back */ |
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/* someone wants us; reopen stdin and stdout */ |
154 |
+ |
/* |
155 |
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if (freopen(inpname, "r", stdin) == NULL) |
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goto openerr; |
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if (freopen(outpname, "w", stdout) == NULL) |
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goto openerr; |
159 |
+ |
*/ |
160 |
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close(0); |
161 |
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if (open(inpname, O_RDONLY) != 0) |
162 |
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error(INTERNAL, "unexpected stdin file number"); |
163 |
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clearerr(stdin); |
164 |
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close(1); |
165 |
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if (open(outpname, O_WRONLY) != 1) |
166 |
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error(INTERNAL, "unexpected stdout file number"); |
167 |
+ |
sleep(3); /* give them a chance to open their pipes */ |
168 |
+ |
if (errname[0]) { |
169 |
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close(2); |
170 |
+ |
if (open(errname, O_WRONLY) != 2) |
171 |
+ |
error(INTERNAL, "unexpected stderr file number"); |
172 |
+ |
unlink(errname); |
173 |
+ |
errname[0] = '\0'; |
174 |
+ |
} |
175 |
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unlink(inpname); |
176 |
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inpname[0] = '\0'; |
177 |
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unlink(outpname); |
184 |
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} |
185 |
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|
186 |
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|
187 |
< |
io_process() /* just act as conduits to and from actual process */ |
187 |
> |
void |
188 |
> |
io_process() /* just act as go-between for actual process */ |
189 |
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{ |
190 |
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register char *cp; |
191 |
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register int nr, n; |
192 |
< |
char buf[4096], *pfin, *pfout; |
193 |
< |
int pid; |
194 |
< |
/* load and close persist file */ |
195 |
< |
nr = read(persistfd, buf, sizeof(buf)); |
196 |
< |
pfdetach(); |
192 |
> |
char buf[BUFSIZ], *pfin, *pfout, *pferr; |
193 |
> |
int pid, nfds; |
194 |
> |
int fdout, fderr = -1; |
195 |
> |
int status = 0; |
196 |
> |
fd_set readfds, excepfds; |
197 |
> |
/* load persist file */ |
198 |
> |
n = 40; |
199 |
> |
while ((nr = read(persistfd, buf, sizeof(buf)-1)) == 0) { |
200 |
> |
if (!n--) |
201 |
> |
error(USER, "unattended persist file?"); |
202 |
> |
pflock(0); |
203 |
> |
sleep(3+(3*getpid()+random())%13); /* wait until ready */ |
204 |
> |
pflock(1); |
205 |
> |
} |
206 |
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if (nr < 0) |
207 |
< |
error(SYSTEM, "cannot read persist file"); |
208 |
< |
buf[nr] = '\0'; |
209 |
< |
if ((cp = index(buf, '\n')) == NULL) |
207 |
> |
error(SYSTEM, "error reading persist file"); |
208 |
> |
#ifndef _WIN32 /* XXX we need a replacement for that one */ |
209 |
> |
ftruncate(persistfd, (off_t)0L); /* truncate persist file */ |
210 |
> |
#endif |
211 |
> |
pfdetach(); /* close & release persist file */ |
212 |
> |
buf[nr] = '\0'; /* parse what we got */ |
213 |
> |
if ((cp = strchr(buf, ' ')) == NULL) |
214 |
|
goto formerr; |
215 |
|
*cp++ = '\0'; |
216 |
< |
if ((pid = atoi(buf)) <= 0) |
216 |
> |
if ((pid = atoi(cp)) <= 0) |
217 |
|
goto formerr; |
218 |
< |
pfin = cp; |
155 |
< |
if ((cp = index(cp, '\n')) == NULL) |
218 |
> |
if ((cp = strchr(cp, '\n')) == NULL) |
219 |
|
goto formerr; |
220 |
+ |
pfin = ++cp; |
221 |
+ |
if ((cp = strchr(cp, '\n')) == NULL) |
222 |
+ |
goto formerr; |
223 |
|
*cp++ = '\0'; |
224 |
|
pfout = cp; |
225 |
< |
if ((cp = index(cp, '\n')) == NULL) |
225 |
> |
if ((cp = strchr(cp, '\n')) == NULL) |
226 |
|
goto formerr; |
227 |
|
*cp++ = '\0'; |
228 |
+ |
pferr = cp; |
229 |
+ |
if ((cp = strchr(cp, '\n')) == NULL) |
230 |
+ |
goto formerr; |
231 |
+ |
*cp++ = '\0'; |
232 |
|
if (cp-buf != nr) |
233 |
|
goto formerr; |
234 |
< |
/* wake up rendering process */ |
234 |
> |
if (strcmp(buf, progname)) { |
235 |
> |
sprintf(errmsg, "persist file for %s, not %s", buf, progname); |
236 |
> |
error(USER, errmsg); |
237 |
> |
} |
238 |
> |
/* wake up rendering process */ |
239 |
|
if (kill(pid, SIGIO) < 0) |
240 |
|
error(SYSTEM, "cannot signal rendering process in io_process"); |
241 |
< |
pid = fork(); /* fork i/o process */ |
241 |
> |
/* fork child feeder process */ |
242 |
> |
pid = fork(); |
243 |
|
if (pid < 0) |
244 |
|
error(SYSTEM, "fork failed in io_process"); |
245 |
< |
/* connect to appropriate pipe */ |
246 |
< |
if (pid) { /* parent passes renderer output */ |
247 |
< |
if (freopen(pfout, "r", stdin) == NULL) |
248 |
< |
error(SYSTEM, "cannot open input pipe in io_process"); |
249 |
< |
} else { /* child passes renderer input */ |
250 |
< |
if (freopen(pfin, "w", stdout) == NULL) |
251 |
< |
error(SYSTEM, "cannot open input pipe in io_process"); |
245 |
> |
if (pid == 0) { /* feeder loop */ |
246 |
> |
int fdin; |
247 |
> |
close(1); /* open input pipe */ |
248 |
> |
if ((fdin = open(pfin, O_WRONLY)) < 0) |
249 |
> |
error(SYSTEM, "cannot open feed pipe in io_process"); |
250 |
> |
/* renderer stdin */ |
251 |
> |
while ((nr = read(0, cp=buf, sizeof(buf))) > 0) { |
252 |
> |
do { |
253 |
> |
if ((n = write(fdin, cp, nr)) <= 0) |
254 |
> |
goto writerr; |
255 |
> |
cp += n; |
256 |
> |
} while ((nr -= n) > 0); |
257 |
> |
} |
258 |
> |
if (nr < 0) |
259 |
> |
goto readerr; |
260 |
> |
_exit(0); |
261 |
|
} |
262 |
< |
/* pass input to output */ |
263 |
< |
cp = buf; n = sizeof(buf); |
264 |
< |
while ((nr = read(fileno(stdin), cp, n)) > 0) { |
265 |
< |
nr += cp-buf; |
266 |
< |
if ((n = write(fileno(stdout), buf, nr)) <= 0) |
267 |
< |
error(SYSTEM, "write error in io_process"); |
268 |
< |
cp = buf; |
269 |
< |
while (n < nr) |
270 |
< |
*cp++ = buf[n++]; |
271 |
< |
n = sizeof(buf) - (cp-buf); |
262 |
> |
close(0); |
263 |
> |
/* open output pipes, in order */ |
264 |
> |
if ((fdout = open(pfout, O_RDONLY)) < 0) |
265 |
> |
error(SYSTEM, "cannot open output pipe in io_process"); |
266 |
> |
if (pferr[0] && (fderr = open(pferr, O_RDONLY)) < 0) |
267 |
> |
error(SYSTEM, "cannot open error pipe in io_process"); |
268 |
> |
for ( ; ; ) { /* eater loop */ |
269 |
> |
FD_ZERO(&readfds); |
270 |
> |
FD_ZERO(&excepfds); |
271 |
> |
nfds = 0; |
272 |
> |
if (fdout >= 0) { |
273 |
> |
FD_SET(fdout, &readfds); |
274 |
> |
FD_SET(fdout, &excepfds); |
275 |
> |
nfds = fdout+1; |
276 |
> |
} |
277 |
> |
if (fderr >= 0) { |
278 |
> |
FD_SET(fderr, &readfds); |
279 |
> |
FD_SET(fderr, &excepfds); |
280 |
> |
nfds = fderr+1; |
281 |
> |
} |
282 |
> |
if (nfds == 0) |
283 |
> |
break; /* all done, exit */ |
284 |
> |
if (select(nfds, &readfds, NULL, &excepfds, NULL) < 0) |
285 |
> |
error(SYSTEM, "error in select call in io_process"); |
286 |
> |
/* renderer stderr */ |
287 |
> |
if (fderr >= 0 && (FD_ISSET(fderr, &readfds) || |
288 |
> |
FD_ISSET(fderr, &excepfds))) { |
289 |
> |
nr = read(fderr, cp=buf, sizeof(buf)); |
290 |
> |
if (nr < 0) |
291 |
> |
goto readerr; |
292 |
> |
if (nr == 0) { |
293 |
> |
close(fderr); |
294 |
> |
/* close(2); don't close stderr! */ |
295 |
> |
fderr = -1; |
296 |
> |
} else { |
297 |
> |
cp[nr] = '\0'; /* deduce status if we can */ |
298 |
> |
n = strlen(progname); |
299 |
> |
if (!strncmp(cp, progname, n) && |
300 |
> |
cp[n++] == ':' && |
301 |
> |
cp[n++] == ' ') { |
302 |
> |
register struct erract *ep; |
303 |
> |
for (ep = erract; ep < erract+NERRS; |
304 |
> |
ep++) |
305 |
> |
if (ep->pre[0] && |
306 |
> |
!strncmp(cp+n, ep->pre, |
307 |
> |
strlen(ep->pre))) { |
308 |
> |
status = ep->ec; |
309 |
> |
break; |
310 |
> |
} |
311 |
> |
} |
312 |
> |
do { /* write message */ |
313 |
> |
if ((n = write(2, cp, nr)) <= 0) |
314 |
> |
goto writerr; |
315 |
> |
cp += n; |
316 |
> |
} while ((nr -= n) > 0); |
317 |
> |
} |
318 |
> |
} |
319 |
> |
/* renderer stdout */ |
320 |
> |
if (fdout >= 0 && (FD_ISSET(fdout, &readfds) || |
321 |
> |
FD_ISSET(fdout, &excepfds))) { |
322 |
> |
nr = read(fdout, cp=buf, sizeof(buf)); |
323 |
> |
if (nr < 0) |
324 |
> |
goto readerr; |
325 |
> |
if (nr == 0) { /* EOF */ |
326 |
> |
close(fdout); |
327 |
> |
close(1); |
328 |
> |
fdout = -1; |
329 |
> |
} else |
330 |
> |
do { /* write it all */ |
331 |
> |
if ((n = write(1, cp, nr)) <= 0) |
332 |
> |
goto writerr; |
333 |
> |
cp += n; |
334 |
> |
} while ((nr -= n) > 0); |
335 |
> |
} |
336 |
|
} |
337 |
< |
fclose(stdin); |
338 |
< |
fclose(stdout); |
191 |
< |
if (pid) /* parent waits for child */ |
192 |
< |
wait(0); |
193 |
< |
exit(0); /* all done, exit (not quit!) */ |
337 |
> |
wait(0); /* wait for feeder process */ |
338 |
> |
_exit(status); |
339 |
|
formerr: |
340 |
|
error(USER, "format error in persist file"); |
341 |
+ |
readerr: |
342 |
+ |
error(SYSTEM, "read error in io_process"); |
343 |
+ |
writerr: |
344 |
+ |
error(SYSTEM, "write error in io_process"); |
345 |
|
} |
346 |
+ |
|
347 |
+ |
#else |
348 |
+ |
|
349 |
+ |
void pfclean() {} |
350 |
+ |
|
351 |
+ |
#endif |