c - 为什么 readlink 函数会导致分段错误而不是将路径字符串移动到指针？

Question

当我运行代码时

char* dirPath = (char*) malloc(pathSize); // pathSize is 512 and its pre defined
readlink("/proc/self/exe",dirPath,pathSize); //segfault here

它段错误。我已经尝试增加 pathSize 的值或将 pathSize 值大一传递到 readlink。我还将 /proc/self/exe 放在单独的变量中并传递它也不起作用。通过 gdb 运行程序说。

Program received signal SIGSEGV, Segmentation fault.
__memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:384
384     ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No such file or directory.

代码工作了很长时间，但最近才破解