diff --git a/include/common/initcall.h b/include/common/initcall.h
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+++ b/include/common/initcall.h
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+/*
+ * include/common/initcall.h
+ *
+ * Initcall management.
+ *
+ * Copyright (C) 2018 Willy Tarreau - w@1wt.eu
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _COMMON_INIT_H
+#define _COMMON_INIT_H
+
+/* List of known init stages. If others are added, please declare their
+ * section at the end of the file below.
+ */
+enum init_stage {
+	STG_PREPARE = 0,      // preset variables, tables, list heads
+	STG_LOCK,             // pre-initialize locks
+	STG_ALLOC,            // allocate required structures
+	STG_POOL,             // create pools
+	STG_REGISTER,         // register static lists (keywords etc)
+	STG_INIT,             // subsystems normal initialization
+	STG_SIZE              // size of the stages array, must be last
+};
+
+/* This is the descriptor for an initcall */
+struct initcall {
+	void (*const fct)(void *arg1, void *arg2, void *arg3);
+	void *arg1;
+	void *arg2;
+	void *arg3;
+};
+
+/* Declare a static variable in the init section dedicated to stage <stg>,
+ * with an element referencing function <function> and arguments <a1..a3>.
+ * <linenum> is needed to deduplicate entries created from a same file. The
+ * trick with (stg<STG_SIZE) consists in verifying that stg if a valid enum
+ * value from the initcall set, and to emit a warning or error if it is not.
+ * The function's type is cast so that it is technically possible to call a
+ * function taking other argument types, provided they are all the same size
+ * as a pointer (args are cast to (void*)). Do not use this macro directly,
+ * use INITCALL{0..3}() instead.
+ */
+#define __DECLARE_INITCALL(stg, linenum, function, a1, a2, a3)     \
+        static const struct initcall *__initcb_##linenum           \
+	    __attribute__((__used__,__section__("init_"#stg))) =   \
+	        (stg < STG_SIZE) ? &(const struct initcall) {      \
+		.fct = (void (*)(void *,void *,void *))function,   \
+		.arg1 = (void *)(a1),                              \
+		.arg2 = (void *)(a2),                              \
+		.arg3 = (void *)(a3),                              \
+	} : NULL
+
+/* This is used to resolve <linenum> to an integer before calling
+ * __DECLARE_INITCALL(). Do not use this macro directly, use INITCALL{0..3}()
+ * instead.
+ */
+#define _DECLARE_INITCALL(...) \
+	__DECLARE_INITCALL(__VA_ARGS__)
+
+/* This requires that function <function> is called with pointer argument
+ * <argument> during init stage <stage> which must be one of init_stage.
+ */
+#define INITCALL0(stage, function)                                     \
+	_DECLARE_INITCALL(stage, __LINE__, function, 0, 0, 0)
+
+/* This requires that function <function> is called with pointer argument
+ * <argument> during init stage <stage> which must be one of init_stage.
+ */
+#define INITCALL1(stage, function, arg1)                               \
+	_DECLARE_INITCALL(stage, __LINE__, function, arg1, 0, 0)
+
+/* This requires that function <function> is called with pointer arguments
+ * <arg1..2> during init stage <stage> which must be one of init_stage.
+ */
+#define INITCALL2(stage, function, arg1, arg2)                         \
+	_DECLARE_INITCALL(stage, __LINE__, function, arg1, arg2, 0)
+
+/* This requires that function <function> is called with pointer arguments
+ * <arg1..3> during init stage <stage> which must be one of init_stage.
+ */
+#define INITCALL3(stage, function, arg1, arg2, arg3)                   \
+	_DECLARE_INITCALL(stage, __LINE__, function, arg1, arg2, arg3)
+
+/* Iterate pointer p (of type initcall**) over all registered calls at
+ * stage <stg>.
+ */
+#define FOREACH_INITCALL(p,stg)                                               \
+	for ((p) = &(__start_init_##stg); (p) < &(__stop_init_##stg); (p)++)
+
+/* Declare a section for stage <stg>. The start and stop pointers are set by
+ * the linker itself, which is why they're declared extern here. The weak
+ * attribute is used so that we declare them ourselves if the section is
+ * empty. The corresponding sections must contain exclusively pointers to
+ * make sure each location may safely be visited by incrementing a pointer.
+ */
+#define DECLARE_INIT_SECTION(stg)                                                   \
+	extern __attribute__((__weak__)) const struct initcall *__start_init_##stg; \
+	extern __attribute__((__weak__)) const struct initcall *__stop_init_##stg
+
+/* Declare all initcall sections here */
+DECLARE_INIT_SECTION(STG_PREPARE);
+DECLARE_INIT_SECTION(STG_LOCK);
+DECLARE_INIT_SECTION(STG_ALLOC);
+DECLARE_INIT_SECTION(STG_POOL);
+DECLARE_INIT_SECTION(STG_REGISTER);
+DECLARE_INIT_SECTION(STG_INIT);
+
+/* not needed anymore */
+#undef DECLARE_INIT_SECTION
+
+/* Run the initcalls for stage <stg>. The test on <stg> is only there to
+ * ensure it is a valid initcall stage.
+ */
+#define RUN_INITCALLS(stg)                                                     \
+	do {                                                                   \
+		const struct initcall **ptr;                                   \
+		if (stg >= STG_SIZE)                                           \
+			break;                                                 \
+		FOREACH_INITCALL(ptr, stg)                                     \
+			(*ptr)->fct((*ptr)->arg1, (*ptr)->arg2, (*ptr)->arg3); \
+	} while (0)
+
+#endif /* _COMMON_INIT_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */