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Yeah, good question.  No particular good answer, I suppose.  If someone wants it, I suppose I can revise the patch.  I would say that this would not be the most striking use of #define for enumerating values.  E.g., DIF_SUBR_*, DOF_SECT_*, DTRACEFLT_*, DTRACEOPT_*, DTRACE_STABILITY_*, DTRACE_CLASS_*, DTRACE_CONST_*, DT_IDENT_*, DT_LINK_*, DT_PRAGMA_*, DTRACE_CONSUME_*, DTRACE_STATUS_*, DTRACE_TRACEMEM_*, DTRACE_AGGWALK_*, and DTRACE_OBJ_*.  All give symbolic names to sequences of integers using #define.  There is strong precedence for the practice. >> diff --git a/libdtrace/dt_prov_uprobe.c b/libdtrace/dt_prov_uprobe.c >> @@ -232,6 +233,10 @@ grow_strtab(dtrace_hdl_t *dtp) >> +#define USDT_FLAG_UNINITIALIZED 0 >> +#define USDT_FLAG_POSSIBLE 1 >> +#define USDT_FLAG_IGNORE 2