= The BOINC diagnostics API =

BOINC applications can call
{{{
int boinc_init_diagnostics(int flags)
}}}
to initialize various diagnostic functions. '''This call should be made early in the program - before `boinc_init()` - so that error info is routed appropriately.''' `flags` is formed by or'ing together a subset of the following flags:
{{{
#define BOINC_DIAG_DUMPCALLSTACKENABLED     0x00000001L
#define BOINC_DIAG_HEAPCHECKENABLED         0x00000002L
#define BOINC_DIAG_MEMORYLEAKCHECKENABLED   0x00000004L
#define BOINC_DIAG_ARCHIVESTDERR            0x00000008L
#define BOINC_DIAG_ARCHIVESTDOUT            0x00000010L
#define BOINC_DIAG_REDIRECTSTDERR           0x00000020L
#define BOINC_DIAG_REDIRECTSTDOUT           0x00000040L
#define BOINC_DIAG_REDIRECTSTDERROVERWRITE  0x00000080L
#define BOINC_DIAG_REDIRECTSTDOUTOVERWRITE  0x00000100L
#define BOINC_DIAG_TRACETOSTDERR            0x00000200L
#define BOINC_DIAG_TRACETOSTDOUT            0x00000400L
}}}

The flags are as follows. Applications are advised to use at least `BOINC_DIAG_DUMPCALLSTACKENABLED`, `BOINC_DIAG_REDIRECTSTDERR`, and `BOINC_DIAG_TRACETOSTDERR`.

 '''BOINC_DIAG_DUMPCALLSTACKENABLED '''::
	If the application crashes, write a symbolic call stack to stderr. If you use this in a Windows app, you must include lib/stackwalker_win.cpp in the compile, and you must include the .pdb (symbol) file in your app version bundle.
 '''BOINC_DIAG_HEAPCHECKENABLED'''::
	Check the integrity of the malloc heap every N allocations. (N is line 120 in diagnostics.C; default 1024).
 '''BOINC_DIAG_MEMORYLEAKCHECKENABLED'''::
	When process exits, write descriptions of any outstanding memory allocations to stderr.
 '''BOINC_DIAG_ARCHIVESTDERR'''::
	Rename stderr.txt to stderr.old on startup.
 '''BOINC_DIAG_ARCHIVESTDOUT'''::
	Rename stdout.txt to stdout.old on startup.
 '''BOINC_DIAG_REDIRECTSTDERR'''::
	Redirect stderr to stderr.txt.
 '''BOINC_DIAG_REDIRECTSTDOUT'''::
	Redirect stdout to stdout.txt.
 '''BOINC_DIAG_REDIRECTSTDERROVERWRITE'''::
	Overwrite stderr.txt (default is to append).
 '''BOINC_DIAG_REDIRECTSTDOUTOVERWRITE'''::
	Overwrite stdout.txt (default is to append).
 '''BOINC_DIAG_TRACETOSTDERR'''::
	Write TRACE macros to stderr (Windows specific).
 '''BOINC_DIAG_TRACETOSTDOUT'''::
	Write TRACE macros to stdout (Windows specific).