当ltrace命中一个rand函数时,它用4个参数显示它: rand(0,0x5649bd4e6010,0x7f0955490760,0x7f09551cf7b0) = 0x17382962
兰德不接受任何争论。这里显示的是什么?
编辑以添加示例:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main() {
srand((unsigned int)time(NULL));
int r = (rand() % 4096);
printf("The number is: %d\n", r);
}
编译并使用ltrace运行:
$ ltrace ./demo
__libc_start_main(0x4005f6, 1, 0x7ffe1e719fa8, 0x400650 <unfinished ...>
time(0) = 1515331941
srand(0x5a522165, 0x7ffe1e719fa8, 0x7ffe1e719fb8, 0) = 0
rand(0x7f75b1a4b620, 0x7ffe1e719e7c, 0x7f75b1a4b0a4, 0x7f75b1a4b11c) = 0x354b8023
printf("The number is: %d\n", 35The number is: 35
) = 18
+++ exited (status 0) +++
$ ltrace ./demo
__libc_start_main(0x4005f6, 1, 0x7fffa0bf3a18, 0x400650 <unfinished ...>
time(0) = 1515331963
srand(0x5a52217b, 0x7fffa0bf3a18, 0x7fffa0bf3a28, 0) = 0
rand(0x7f6e22884620, 0x7fffa0bf38ec, 0x7f6e228840a4, 0x7f6e2288411c) = 0x6667c0f4
printf("The number is: %d\n", 244The number is: 244
) = 19
+++ exited (status 0) +++
rand显示的参数是什么?
rand(0x7f6e22884620, 0x7fffa0bf38ec, 0x7f6e228840a4, 0x7f6e2288411c) = 0x6667c0f4
0x7f6e22884620,0x7fffa0bf38ec,0x7f6e228840a4,0x7f6e2288411c是什么?
发布于 2018-01-07 13:41:32
根据x86-64abi约定,ltrace
显示了传递参数的少数寄存器的内容。
对于其他函数,ltrace
知道它们的API (即它们的签名),所以更巧妙地显示参数。
请参阅ltrace(1)和原型库发现部分。
https://stackoverflow.com/questions/48131925
复制相似问题