void mysql_debug(const char * debug);debug - a string representing the debug operation to perform. See description below.
Enables debug output for development and debug purposes by using Fred Fish's DBUG library. For using this function the mariadb-client library must be compiled with debug support.
Almost all MariaDB binaries use the DBUG library and one can get a trace of the program execution by using the --debug command line option with the binary. This will only work if the binary is compiled for debugging (compiler option -DDBUG_ON).
Returns void.
The debug control string is a sequence of colon separated fields as follows:
field_1:field_2:field_nEach field consists of a mandatory flag character followed by an optional "," and comma separated list of modifiers:
flag[,modifier,modifier,...,modifier]The currently recognized flag characters are:
d
Enable output from DBUG_ macros for the current state. May be followed by a list of keywords which selects output only for the DBUG macros with that keyword. A null list of keywords implies output for all macros.
D
Delay after each debugger output line. The argument is the number of tenths of seconds to delay, subject to machine capabilities. I.E. -#D,20 is delay two seconds.
f
Limit debugging and/or tracing, and profiling to the list of named functions. Note that a null list will disable all functions. The appropriate "d" or "t" flags must still be given, this flag only limits their actions if they are enabled.
F
Identify the source file name for each line of debug or trace output.
i
Identify the process with the pid for each line of debug or trace output.
g
Enable profiling. Create a file called 'dbugmon.out' containing information that can be used to profile the program. May be followed by a list of keywords that select profiling only for the functions in that list. A null list implies that all functions are considered.
L
Identify the source file line number for each line of debug or trace output.
n
Print the current function nesting depth for each line of debug or trace output.
N
Number each line of dbug output.
o
Redirect the debugger output stream to the specified file. The default output is stderr.
O
As o but the file is really flushed between each write. When needed the file is closed and reopened between each write.
a
Like o, but opens for append.
A
Like O, but opens for append.
p
Limit debugger actions to specified processes. A process must be identified with the DBUG_PROCESS macro and match one in the list for debugger actions to occur.
P
Print the current process name for each line of debug or trace output.
r
When pushing a new state, do not inherit the previous state's function nesting level. Useful when the output is to start at the left margin.
S
Do function _sanity(file,line) at each debugged function until _sanity() returns something that differs from 0. (Mostly used with safemalloc)
t
Enable function call/exit trace lines. May be followed by a list (containing only one modifier) giving a numeric maximum trace level, beyond which no output will occur for either debugging or tracing macros. The default is a compile time option.
mysql_debug_end()