Ok, so I started looking at the internals of dietlibc, and I noticed the
data returned by getdents64 looks as I would expect, but the struct
dirent64 does not match it. Apparently the way these things are being
compiled it ends up with sizeof(uint64_t) = 4, so the struct fields don't
line up.
I think I will be filing a bug against dietlibc in the morning. It seems
compiling with "diet gcc -g -D_FILE_OFFSET_BITS=64" causes readdir to
break, at least on sparc.
Ivan
(gdb) break getdents64
Breakpoint 2 at 0x116dc
(gdb) run
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /home/ivan/deb/util-vserver-0.30.216-pre2864/src/showattr
vc_get_iattr(): Function not implemented
ERR .
Breakpoint 2, 0x000116dc in getdents64 ()
(gdb) bt
#0 0x000116dc in getdents64 ()
#1 0x0001114c in readdir64 ()
#2 0x00010230 in Ereaddir (path=0x11730 ".")
at ./ensc_wrappers/wrappers-dirent.hc:38
#3 iterateFilesystem (path=0x11730 ".") at src/fstool.c:83
#4 0x000106b8 in processFile (path=0x11730 ".") at src/fstool.c:162
#5 0x00010ae8 in main (argc=1, argv=<value optimized out>) at src/fstool.c:236
(gdb) disas
Dump of assembler code for function getdents64:
0x000116dc <getdents64+0>: b 0x10e44 <__unified_syscall>
0x000116e0 <getdents64+4>: mov 0x9a, %g1
End of assembler dump.
(gdb) fini
Run till exit from #0 0x000116dc in getdents64 ()
0x0001114c in readdir64 ()
(gdb) print o1
No symbol "o1" in current context.
(gdb) print $o1
$1 = -134234112
(gdb) print/x $o1
$2 = 0xf7ffc000
(gdb) x/10 0xf7ffc000
0xf7ffc000: 0x00000000 0x0000e105 0x00000000 0x033036bc
0xf7ffc010: 0x00200876 0x6c696d69 0x742e6300 0x00000000
0xf7ffc020: 0x00000000 0x0000e0c6
(gdb) print (char*) 0xf7ffc013
$3 = 0xf7ffc013 "vlimit.c"
(gdb) bt
#0 0x0001114c in readdir64 ()
#1 0x00010230 in Ereaddir (path=0x11730 ".")
at ./ensc_wrappers/wrappers-dirent.hc:38
#2 iterateFilesystem (path=0x11730 ".") at src/fstool.c:83
#3 0x000106b8 in processFile (path=0x11730 ".") at src/fstool.c:162
#4 0x00010ae8 in main (argc=1, argv=<value optimized out>) at src/fstool.c:236
(gdb) fini
Run till exit from #0 0x0001114c in readdir64 ()
Ereaddir (path=0x11730 ".") at ./ensc_wrappers/wrappers-dirent.hc:40
40 FatalErrnoError(res==0 && errno!=0, "readdir()");
(gdb) print res
$4 = <value optimized out>
(gdb) print $o0
$5 = -134234112
(gdb) print $o1
$6 = 71472
(gdb) print/x $o0
$7 = 0xf7ffc000
(gdb) x/10 0xf7ffc000
0xf7ffc000: 0x00000000 0x0000e105 0x00000000 0x033036bc
0xf7ffc010: 0x00200876 0x6c696d69 0x742e6300 0x00000000
0xf7ffc020: 0x00000000 0x0000e0c6
(gdb) bt
#0 Ereaddir (path=0x11730 ".") at ./ensc_wrappers/wrappers-dirent.hc:40
#1 iterateFilesystem (path=0x11730 ".") at src/fstool.c:83
#2 0x000106b8 in processFile (path=0x11730 ".") at src/fstool.c:162
#3 0x00010ae8 in main (argc=1, argv=<value optimized out>) at src/fstool.c:236
(gdb) fini
Run till exit from #0 Ereaddir (path=0x11730 ".")
at ./ensc_wrappers/wrappers-dirent.hc:40
86 if (ent==0) break;
(gdb) print ent
$8 = (struct dirent64 *) 0xf7ffc000
(gdb) print *ent
$9 = {d_ino = 0, d_off = 57605, d_reclen = 0, d_type = 0 '\000',
d_name = "\000\003\060\066\274\000 \bvlimit.c", '\000' <repeats 11
times>"\340, \306\000\000\000\000\003\251~\030\000 \btunctl.c", '\000' <repeats
11 times>"\341, \b\000\000\000\000\003\254\336\340\000 \butil.h", '\000'
<repeats 13 times>"\347, \246\000\000\000\000\004\267\204L\000
\bvreboot.o\000\000\000\000\000\000\000\000\000\000\340\366\000\000\000\000\004\363\344\245\000(\bmask2prefix.c",
'\000' <repeats 14 times>"\350, \001\000\000\000\000\006\211\325+\000
\bexec-remount\000\000\000\000\000\000\000\340\356\000\000\000\000\a\242\023\065\000
\bnattribute.c\000\000\000\000\000\000\000\347\351\000\000\000\000\b"...}
(gdb) print ent->d_name
$10 = "\000\003\060\066\274\000 \bvlimit.c", '\000' <repeats 11 times>"\340,
\306\000\000\000\000\003\251~\030\000 \btunctl.c", '\000' <repeats 11
times>"\341, \b\000\000\000\000\003\254\336\340\000 \butil.h", '\000' <repeats
13 times>"\347, \246\000\000\000\000\004\267\204L\000
\bvreboot.o\000\000\000\000\000\000\000\000\000\000\340\366\000\000\000\000\004\363\344\245\000(\bmask2prefix.c",
'\000' <repeats 14 times>"\350, \001\000\000\000\000\006\211\325+\000
\bexec-remount\000\000\000\000\000\000\000\340\356\000\000\000\000\a\242\023\065\000
\bnattribute.c\000\000\000\000\000\000\000\347\351\000\000\000\000\b"...
(gdb) print &ent->d_name
$11 = (char (*)[256]) 0xf7ffc00b
(gdb) print &ent->d_ino
$12 = (long unsigned int *) 0xf7ffc000
(gdb) print &ent->d_off
$13 = (long int *) 0xf7ffc004
(gdb) print &ent->d_reclen
$14 = (short unsigned int *) 0xf7ffc008
(gdb) print &ent->d_type
$15 = (unsigned char *) 0xf7ffc00a ""
(gdb) print sizeof(struct dirent64)
$16 = 268
(gdb) print sizeof(struct dirent)
No struct type named dirent.
(gdb) print sizeof(ent->d_ino)
$17 = 4
(gdb) print sizeof(uint64_t)
$18 = 4
(gdb)
