Add an allocation limit injection facility

src/fellow_inject.h

@@ -100,6 +100,18 @@ fc_inj_err(const char *err)
 #define FC_INJ fc_inj_injected(__func__, __LINE__)
 #define FC_ERRSTR(x) fc_inj_err(x)
 
+_Thread_local size_t size_limit = SIZE_MAX;
+
+#define FC_INJ_SZLIM(x) do {						\
+		if (x > size_limit) {					\
+			DBG("%s limited from %zu to %zu",		\
+			    #x, x, size_limit);				\
+			x = size_limit;					\
+		}							\
+		size_limit = SIZE_MAX;					\
+	} while (0)
+#define FC_INJ_SZLIM_SET(x) size_limit = x
+
 #else  // FCERR_INJECT
 
 #define FC_INJ 0
@@ -107,6 +119,7 @@ fc_inj_err(const char *err)
 #define fc_inj_reset() (void)0
 #define fc_inj_set(x) (void)0
 #define fc_inj_count() 0
-
+#define FC_INJ_SZLIM(x) (void)0
+#define FC_INJ_SZLIM_SET(x) (void)0
 
 #endif // FCERR_INJECT

src/flint.lnt

@@ -78,7 +78,7 @@
 // symbol not ref (constructor)
 -esym(528, init_fcos_transitions, assert_fcos*)
 -esym(755, BWIT_*)
--esym(755, fc_inj_*)
+-esym(755, fc_inj_*, FC_INJ_SZLIM_SET)	// not referenced
 
 // fellow_io_uring.c
 -emacro(835, BLKDISCARD)