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An example interface with 32 and 64 bit variants
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| // User defines a different type | |
| #define MYLONG int | |
| #include "interface.h" | |
| #include "stdio.h" | |
| // User callback using his own type | |
| int test(const int i, const my_long var, const int j) { | |
| printf("i = %d\n",i); | |
| printf("var = %lld\n",(long long) var); | |
| printf("j = %d\n",j); | |
| printf("%lld\n", 2LL*var-11); | |
| return var - 7; | |
| } | |
| int main() { | |
| // This is what user sees | |
| api_func functionPtr = &test; | |
| define_callback(functionPtr); | |
| // Simulate callback call | |
| call_callback(); | |
| return 0; | |
| } |
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| #pragma once | |
| // MYLONG is defined differently internally and externally (before importing this file) | |
| typedef MYLONG my_long; | |
| // Callback definition | |
| typedef int (*api_func)(const int, const my_long, const int); // surround by int to test alignment issues | |
| void define_callback(api_func fptr); | |
| void call_callback(); |
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| #define MYLONG long long | |
| #include "interface.h" | |
| // Callback handling | |
| api_func callback_ptr = 0; | |
| void define_callback(api_func fptr) { | |
| callback_ptr = fptr; | |
| } | |
| void call_callback() { | |
| (*callback_ptr)(1000, 100000, 100); | |
| (*callback_ptr)(1000, 10000000000, 100); // will overflow when user uses int | |
| } |
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| CC=gcc | |
| CFLAGS=-g -Wall -fPIC | |
| LDFLAGS=-Wall | |
| SRC= $(wildcard *.c) | |
| OBJ= $(SRC:.c=.o) | |
| all: $(OBJ) runtime runtime_static runtime_dynamic | |
| %.o: %.c | |
| $(CC) -c $< $(CFLAGS) -o $@ | |
| libinternal.so: internal.o | |
| $(CC) -shared -o $@ $^ $(LDFLAGS) | |
| libinternal.a: internal.o | |
| ar rcs $@ $^ | |
| runtime: $(OBJ) | |
| $(CC) $(CFLAGS) -o $@ $(OBJ) $(LDFLAGS) | |
| runtime_static: libinternal.a example.o | |
| $(CC) example.o -o $@ -L. -linternal $(LDFLAGS) | |
| runtime_dynamic: libinternal.so example.o | |
| $(CC) example.o -o $@ -L. -linternal $(LDFLAGS) | |
| clean: | |
| rm -f *.a *.so *.o | |
| realclean: clean | |
| rm -f runtime runtime_static runtime_dynamic |
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