来自FILE *的C打印文件路径 [英] C print file path from FILE*

问题描述

FILE * fd = fopen ("/tmp/12345","wb");

如果我具有变量fd，如何打印文件路径? (/tmp/12345)在Linux环境中.

If I have the variable fd , how can I print the file path ? (/tmp/12345) in Linux env.

推荐答案

您不能.不只是标准C.

You can't. Not with just standard C.

在Linux上，您可以执行以下操作:

On Linux you can do:

#include <stdio.h>
#include <unistd.h>
#include <limits.h>
#include <stdlib.h>


int print_filename(FILE *f)
{
    char buf[PATH_MAX];
    char fnmbuf[sizeof "/prof/self/fd/0123456789"];
    sprintf(fnmbuf,"/proc/self/fd/%d", fileno(f));
    ssize_t nr;
    if(0>(nr=readlink(fnmbuf, buf, sizeof(buf)))) return -1;
    else buf[nr]='\0';
    return puts(buf);
}

int main(void)
{
    FILE * f = fopen ("/tmp/12345","wb");
    if (0==f) return EXIT_FAILURE;
    print_filename(f);

}

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