mac os x dyld 插件

// libinterposers.c
   
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
   
typedef struct interpose_s {
    void *new_func;
    void *orig_func;
} interpose_t;
   
int my_open(const char *, int, mode_t);
int my_close(int);
   
static const interpose_t interposers[] \
    __attribute__ ((section("__DATA, __interpose"))) = {
        { (void *)my_open,  (void *)open  },
        { (void *)my_close, (void *)close },
    };
   
int
my_open(const char *path, int flags, mode_t mode)
{
    int ret = open(path, flags, mode);
    printf("--> %d = open(%s, %x, %x)\n", ret, path, flags, mode);
    return ret;
}
   
int
my_close(int d)
{
    int ret = close(d);
    printf("--> %d = close(%d)\n", ret, d);
    return ret;
}

输入 但是没效果先放到这里

haidragondeMacBook-Air:2-11 haidragon$ gcc -Wall -dynamiclib -o /tmp/libinterposers.dylib ./libinterposers.c 
./libinterposers.c:15:26: warning: unused variable 'interposers' [-Wunused-const-variable]
static const interpose_t interposers[] \
                         ^
1 warning generated.
haidragondeMacBook-Air:2-11 haidragon$ DYLD_INSERT_LIBRARIES=/tmp/libinterposers.dylib cat /dev/null
haidragondeMacBook-Air:2-11 haidragon$