LD_PRELOAD-hook系统函数

函数调用

测试程序

gcc test.c -o test # cat test.c // test.c #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <string.h> int main() { int fd = open("/tmp/test.txt", O_CREAT | O_WRONLY | O_TRUNC, 0644); if (fd < 0) { perror("open"); return 1; } const char *msg = "hello preload hook\n"; write(fd, msg, strlen(msg)); close(fd); return 0; }

hook系统函数open和write

gcc -shared -fPIC hook.c -o hook.so -ldl # cat hook.c #define _GNU_SOURCE #include <dlfcn.h> #include <stdio.h> #include &