34 |
|
|
35 |
|
static FILE *ambfp = NULL; /* ambient file pointer */ |
36 |
|
static int nunflshed; /* number of unflushed ambient values */ |
37 |
– |
static FILE *ambinp = NULL; /* input pointer for ambient i/o */ |
37 |
|
|
38 |
|
static double avsum = 0.; /* computed ambient value sum (log) */ |
39 |
|
static unsigned int navsum = 0; /* number of values in avsum */ |
40 |
|
static unsigned int nambvals = 0; /* total number of indirect values */ |
41 |
+ |
static FILE *ambinp = NULL; /* auxiliary file for input */ |
42 |
|
static off_t lastpos = -1; /* last flush position */ |
43 |
|
|
44 |
|
#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
68 |
|
static int extambient(SCOLOR cr, AMBVAL *ap, FVECT pv, FVECT nv, |
69 |
|
FVECT uvw[3]); |
70 |
|
|
71 |
+ |
#ifdef F_SETLKW |
72 |
+ |
static void aflock(int typ); |
73 |
+ |
#endif |
74 |
|
|
75 |
+ |
|
76 |
|
void |
77 |
|
setambres( /* set ambient resolution */ |
78 |
|
int ar |
115 |
|
void |
116 |
|
setambient(void) /* initialize calculation */ |
117 |
|
{ |
118 |
< |
int exists; |
118 |
> |
int readonly = 0; |
119 |
|
off_t flen; |
120 |
|
AMBVAL amb; |
121 |
|
/* make sure we're fresh */ |
131 |
|
error(WARNING, errmsg); |
132 |
|
return; |
133 |
|
} |
134 |
< |
exists = access(ambfile, F_OK) == 0; /* check existence, first */ |
135 |
< |
ambfp = fopen(ambfile, "a+"); /* try read/append */ |
136 |
< |
if (!exists & (ambfp == NULL)) { |
137 |
< |
sprintf(errmsg, "cannot create ambient file \"%s\"", ambfile); |
138 |
< |
error(SYSTEM, errmsg); |
139 |
< |
} |
136 |
< |
if (ambfp == NULL) { /* try opening read-only? */ |
137 |
< |
if ((ambfp = fopen(ambfile, "r")) == NULL) { |
138 |
< |
sprintf(errmsg, |
139 |
< |
"cannot open ambient file \"%s\" for reading", |
140 |
< |
ambfile); |
141 |
< |
error(SYSTEM, errmsg); |
142 |
< |
} |
143 |
< |
exists = -1; /* flag read-only */ |
144 |
< |
} else if (exists) |
145 |
< |
rewind(ambfp); /* XXX not necessary? */ |
146 |
< |
|
147 |
< |
if (exists) { |
148 |
< |
initambfile(0); /* file already exists */ |
149 |
< |
lastpos = ftell(ambfp); |
134 |
> |
/* open ambient file */ |
135 |
> |
if ((ambfp = fopen(ambfile, "r+")) == NULL) |
136 |
> |
readonly = (ambfp = fopen(ambfile, "r")) != NULL; |
137 |
> |
if (ambfp != NULL) { |
138 |
> |
initambfile(0); /* file exists */ |
139 |
> |
lastpos = ftello(ambfp); |
140 |
|
while (readambval(&amb, ambfp)) |
141 |
< |
avstore(&amb); /* load what we can */ |
142 |
< |
if (exists < 0) { /* read-only? */ |
141 |
> |
avstore(&amb); |
142 |
> |
if (readonly) { |
143 |
|
sprintf(errmsg, |
144 |
|
"loaded %u values from read-only ambient file", |
145 |
|
nambvals); |
146 |
|
error(WARNING, errmsg); |
147 |
|
fclose(ambfp); /* close file so no writes */ |
148 |
|
ambfp = NULL; |
149 |
< |
return; |
149 |
> |
return; /* avoid ambsync() */ |
150 |
|
} |
151 |
|
/* align file pointer */ |
152 |
|
lastpos += (off_t)nambvals*AMBVALSIZ; |
153 |
|
flen = lseek(fileno(ambfp), 0, SEEK_END); |
154 |
|
if (flen != lastpos) { |
155 |
|
sprintf(errmsg, |
156 |
< |
"ignoring last %lu values in ambient file (corrupted)", |
157 |
< |
(unsigned long)((flen - lastpos)/AMBVALSIZ)); |
156 |
> |
"ignoring last %ld values in ambient file (corrupted)", |
157 |
> |
(flen - lastpos)/AMBVALSIZ); |
158 |
|
error(WARNING, errmsg); |
169 |
– |
/* fseek() not needed? */ |
159 |
|
fseeko(ambfp, lastpos, SEEK_SET); |
160 |
|
ftruncate(fileno(ambfp), lastpos); |
161 |
|
} |
162 |
< |
} else { |
163 |
< |
initambfile(1); /* else start new file */ |
162 |
> |
} else if ((ambfp = fopen(ambfile, "w+")) != NULL) { |
163 |
> |
initambfile(1); /* else create new file */ |
164 |
|
fflush(ambfp); |
165 |
< |
lastpos = ftell(ambfp); |
165 |
> |
lastpos = ftello(ambfp); |
166 |
> |
} else { |
167 |
> |
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
168 |
> |
error(SYSTEM, errmsg); |
169 |
|
} |
170 |
+ |
#ifdef F_SETLKW |
171 |
+ |
aflock(F_UNLCK); /* release file */ |
172 |
+ |
#endif |
173 |
|
} |
174 |
|
|
175 |
|
|
177 |
|
ambdone(void) /* close ambient file and free memory */ |
178 |
|
{ |
179 |
|
if (ambfp != NULL) { /* close ambient file */ |
180 |
< |
fclose(ambfp); /* don't call ambsync() */ |
180 |
> |
ambsync(); |
181 |
> |
fclose(ambfp); |
182 |
|
ambfp = NULL; |
183 |
< |
lastpos = -1; |
188 |
< |
if (ambinp != NULL) { |
183 |
> |
if (ambinp != NULL) { |
184 |
|
fclose(ambinp); |
185 |
|
ambinp = NULL; |
186 |
|
} |
187 |
+ |
lastpos = -1; |
188 |
|
} |
189 |
|
/* free ambient tree */ |
190 |
|
unloadatree(&atrunk, avfree); |
631 |
|
|
632 |
|
if (!AMBFLUSH) |
633 |
|
error(INTERNAL, "BUFSIZ too small in initambfile"); |
634 |
+ |
#ifdef F_SETLKW |
635 |
+ |
aflock(cre8 ? F_WRLCK : F_RDLCK); |
636 |
+ |
#endif |
637 |
|
SET_FILE_BINARY(ambfp); |
638 |
|
if (mybuf == NULL) |
639 |
< |
mybuf = (char *)bmalloc(BUFSIZ); |
639 |
> |
mybuf = (char *)bmalloc(BUFSIZ+8); |
640 |
|
setbuf(ambfp, mybuf); |
641 |
|
nunflshed = 0; |
642 |
|
retry: |
667 |
|
putambmagic(ambfp); |
668 |
|
} else if (getheader(ambfp, amb_headline, NULL) < 0 || !hasambmagic(ambfp)) { |
669 |
|
if (--ntries > 0 && ftell(ambfp) == 0) { |
670 |
+ |
#ifdef F_SETLKW |
671 |
+ |
aflock(F_UNLCK); |
672 |
|
clearerr(ambfp); |
673 |
|
sleep(2); |
674 |
+ |
aflock(F_RDLCK); |
675 |
+ |
#else |
676 |
+ |
clearerr(ambfp); |
677 |
+ |
sleep(2); |
678 |
+ |
#endif |
679 |
|
goto retry; |
680 |
|
} |
681 |
|
error(USER, "bad/incompatible ambient file"); |
813 |
|
} |
814 |
|
|
815 |
|
|
816 |
+ |
#ifdef F_SETLKW |
817 |
+ |
|
818 |
+ |
static void |
819 |
+ |
aflock( /* lock/unlock ambient file */ |
820 |
+ |
int typ |
821 |
+ |
) |
822 |
+ |
{ |
823 |
+ |
static struct flock fls; /* static so initialized to zeroes */ |
824 |
+ |
|
825 |
+ |
if (typ == fls.l_type) /* already called? */ |
826 |
+ |
return; |
827 |
+ |
|
828 |
+ |
fls.l_type = typ; |
829 |
+ |
do |
830 |
+ |
if (fcntl(fileno(ambfp), F_SETLKW, &fls) != -1) |
831 |
+ |
return; |
832 |
+ |
while (errno == EINTR); |
833 |
+ |
|
834 |
+ |
error(SYSTEM, "cannot (un)lock ambient file"); |
835 |
+ |
} |
836 |
+ |
|
837 |
+ |
|
838 |
|
int |
839 |
|
ambsync(void) /* synchronize ambient file */ |
840 |
|
{ |
841 |
< |
off_t newpos; |
814 |
< |
int n; |
841 |
> |
off_t flen; |
842 |
|
AMBVAL avs; |
843 |
+ |
int n; |
844 |
|
|
845 |
|
if (ambfp == NULL) /* no ambient file? */ |
846 |
|
return(0); |
847 |
< |
|
848 |
< |
if (nunflshed > 0) { /* append new values? */ |
849 |
< |
if (fflush(ambfp) < 0) |
850 |
< |
return(EOF); |
823 |
< |
newpos = lseek(fileno(ambfp), 0, SEEK_CUR); |
824 |
< |
} else |
825 |
< |
newpos = lseek(fileno(ambfp), 0, SEEK_END); |
826 |
< |
|
827 |
< |
if (newpos < 0) |
847 |
> |
/* gain appropriate access */ |
848 |
> |
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
849 |
> |
/* see if file has grown */ |
850 |
> |
if ((flen = lseek(fileno(ambfp), 0, SEEK_END)) < 0) |
851 |
|
goto seekerr; |
852 |
< |
/* how many others added? */ |
853 |
< |
n = (newpos - lastpos)/AMBVALSIZ - nunflshed; |
854 |
< |
nunflshed = 0; |
855 |
< |
if (n <= 0) { /* no one helping this time? */ |
856 |
< |
lastpos = newpos; |
834 |
< |
return(0); |
835 |
< |
} |
836 |
< |
if (ambinp == NULL) { /* else need to open for input? */ |
837 |
< |
ambinp = fopen(ambfile, "r"); |
838 |
< |
if (ambinp == NULL) { |
839 |
< |
sprintf(errmsg, "cannot reopen ambient file \"%s\"", |
840 |
< |
ambfile); |
841 |
< |
error(SYSTEM, errmsg); |
852 |
> |
if ((n = flen - lastpos) > 0) { /* file has grown */ |
853 |
> |
if (ambinp == NULL) { /* get new file pointer */ |
854 |
> |
ambinp = fopen(ambfile, "rb"); |
855 |
> |
if (ambinp == NULL) |
856 |
> |
error(SYSTEM, "fopen failed in ambsync"); |
857 |
|
} |
858 |
< |
SET_FILE_BINARY(ambinp); |
859 |
< |
} |
860 |
< |
/* read from last endpoint */ |
861 |
< |
if (fseeko(ambinp, lastpos, SEEK_SET) < 0) |
862 |
< |
goto seekerr; |
863 |
< |
while (n-- > 0) { /* load new contributed values */ |
864 |
< |
if (!readambval(&avs, ambinp)) { |
865 |
< |
sprintf(errmsg, "ambient file \"%s\" corrupted", |
866 |
< |
ambfile); |
867 |
< |
error(WARNING, errmsg); |
868 |
< |
break; |
858 |
> |
if (fseeko(ambinp, lastpos, SEEK_SET) < 0) |
859 |
> |
goto seekerr; |
860 |
> |
while (n >= AMBVALSIZ) { /* load contributed values */ |
861 |
> |
if (!readambval(&avs, ambinp)) { |
862 |
> |
sprintf(errmsg, |
863 |
> |
"ambient file \"%s\" corrupted near character %ld", |
864 |
> |
ambfile, flen - n); |
865 |
> |
error(WARNING, errmsg); |
866 |
> |
break; |
867 |
> |
} |
868 |
> |
avstore(&avs); |
869 |
> |
n -= AMBVALSIZ; |
870 |
|
} |
871 |
< |
avstore(&avs); |
871 |
> |
lastpos = flen - n; /* check alignment */ |
872 |
> |
if (n && lseek(fileno(ambfp), lastpos, SEEK_SET) < 0) |
873 |
> |
goto seekerr; |
874 |
|
} |
875 |
< |
lastpos = newpos; /* update endpoint */ |
876 |
< |
return(0); |
875 |
> |
n = fflush(ambfp); /* calls write() at last */ |
876 |
> |
lastpos += (off_t)nunflshed*AMBVALSIZ; |
877 |
> |
aflock(F_UNLCK); /* release file */ |
878 |
> |
nunflshed = 0; |
879 |
> |
return(n); |
880 |
|
seekerr: |
881 |
|
error(SYSTEM, "seek failed in ambsync"); |
882 |
|
return(EOF); /* pro forma return */ |
883 |
|
} |
884 |
+ |
|
885 |
+ |
#else /* ! F_SETLKW */ |
886 |
+ |
|
887 |
+ |
int |
888 |
+ |
ambsync(void) /* flush ambient file */ |
889 |
+ |
{ |
890 |
+ |
if (ambfp == NULL) |
891 |
+ |
return(0); |
892 |
+ |
nunflshed = 0; |
893 |
+ |
return(fflush(ambfp)); |
894 |
+ |
} |
895 |
+ |
|
896 |
+ |
#endif /* ! F_SETLKW */ |