FreeTDS Development Group

["ZIGLIO, Frediano, VF-IT" <Frediano.Ziglio AT vodafone.com>]

I'm adding some tests to libTDS. Here you are some results.

$ ./dataread
dataread.c: Testing conversion from server
dataread: tds_checks.c:135: tds_check_tds_extra: Assertion `result_found || 
tds->current_results == ((void *)0)' failed.
Abortito (core dumped)
$ gdb ./dataread core.22607
GNU gdb Red Hat Linux (5.3.90-0.20030710.41rh)
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This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db 
library "/lib/libthread_db.so.1".

Core was generated by `./dataread'.
Program terminated with signal 6, Aborted.
Reading symbols from 
/home/freddy/cpp/freetds/freetds64/src/tds/.libs/libtds.so.5...done.
Loaded symbols for 
/home/freddy/cpp/freetds/freetds64/src/tds/.libs/libtds.so.5
Reading symbols from /lib/i686/libc.so.6...done.
Loaded symbols for /lib/i686/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libnss_files.so.2...done.
Loaded symbols for /lib/libnss_files.so.2
Reading symbols from /lib/libnss_dns.so.2...done.
Loaded symbols for /lib/libnss_dns.so.2
Reading symbols from /lib/libresolv.so.2...done.
Loaded symbols for /lib/libresolv.so.2
Reading symbols from /usr/lib/gconv/ISO8859-1.so...done.
Loaded symbols for /usr/lib/gconv/ISO8859-1.so
Reading symbols from /usr/lib/gconv/CP1252.so...done.
Loaded symbols for /usr/lib/gconv/CP1252.so
#0  0x4d200b31 in kill () from /lib/i686/libc.so.6
(gdb) bt
#0  0x4d200b31 in kill () from /lib/i686/libc.so.6
#1  0x4d2007f5 in raise () from /lib/i686/libc.so.6
#2  0x4d201f28 in abort () from /lib/i686/libc.so.6
#3  0x4d1f9c58 in __assert_fail () from /lib/i686/libc.so.6
#4  0x4002022e in tds_check_tds_extra (tds=0x804c080) at tds_checks.c:142
#5  0x4000a47b in tds_process_result_tokens (tds=0x804c080, 
result_type=0xbffff71c, done_flags=0x0) at token.c:509
#6  0x08048e04 in test (type=0x8049aa2 "BIT", value=0x0, result=0x8049aa6 
"1") at dataread.c:57
#7  0x080490aa in main (argc=1, argv=0xbffff9d4) at dataread.c:136
(gdb) print *(TDSSOCKET*)0x804c080
$1 = {s = 3, major_version = 8, minor_version = 0, product_version = 
2281701570, product_name = 0x807e0b0 "Microsoft SQL Server",
  capabilities = 
"\001\t\000\000\006m\177▒▒▒▒\002\t\000\000\000\000\nh\000\000", broken_dates 
= 0 '\0', option_flag2 = 3 '\003',
  in_buf = 0x806d9b8 "\201\001", out_buf = 0x807e128 "", in_buf_max = 357, 
in_pos = 22, out_pos = 8, in_len = 22, in_flag = 4 '\004', out_flag = 1 
'\001',
  last_packet = 1 '\001', parent = 0x0, current_results = 0x807e010, res_info 
= 0x0, num_comp_info = 0, comp_info = 0x0, param_info = 0x0, cursor = 0x0,
  has_status = 0 '\0', ret_status = 0, state = 0 '\0', rows_affected = -1, 
timeout = 0, longquery_timeout = 0, longquery_func = 0, longquery_param = 0x0,
  queryStarttime = 1101982485, env = 0x804c358, num_dyns = 0, cur_dyn = 0x0, 
dyns = 0x0, emul_little_endian = 0, date_fmt = 0x0, tds_ctx = 0x804c068,
  char_conv_count = 5, char_convs = 0x806db70, connection = 0x0, spid = -1, 
collation = "\t\004▒\0004", env_chg_func = 0, chkintr = 0, hndlintr = 0,
  internal_sp_called = 0, client_cursor_id = 0}

"Assertion `result_found || tds->current_results == ((void *)0)' failed" 
means that current_results do not point to any known data. From gdb you can 
see that current_results point to a buffer however we can find this buffer in 
res_info, param_info, compute, cursors or dynamic... I always though that 
current_results should point to one of these members... valgrind prove that 
there is no memory leaks however I don't understand how this can happen....

freddy77