找到指向 argv[0] 的指针，以便我可以更改它 [英] Finding pointer to argv[0] so I can change it

问题描述

在 Solaris 上，我通过 getexecname 获得了一个指向 argv[0] 的指针，然后我可以在该位置 memcpy.(根据 在没有/proc/self/的情况下查找当前可执行文件的路径exe)

On Solaris I got a pointer to argv[0] with getexecname and then I can memcpy at that location. (per Finding current executable's path without /proc/self/exe)

我想知道如何在 Linux 中获得指向 argv[0] 的指针我在 /proc/self/exe 上做了 readlink 但是它没有给我一个指向它的指针.

I was wondering how to get a pointer to argv[0] in Linux I did readlink on /proc/self/exe but it doesn't give me a pointer to it.

谢谢

推荐答案

对于 readlink，自带缓冲区.你分配一个缓冲区，传入一个指向它的指针，readlink 将把结果存储在那里:

For readlink, Bring Your Own Buffer. You allocate a buffer, pass in a pointer to it, and readlink will store the results there:

#include <unistd.h>
#include <linux/limits.h>

int main() {
  char buffer[PATH_MAX];

  int size = readlink("/proc/self/exe", buffer, sizeof(buffer));
  buffer[size] = '\0';

  // buffer is now the char* holding the filename

  printf("The executable is %s\n", buffer);
}

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