On 21 July 2016 at 12:37, Alex Bligh <a...@alex.org.uk> wrote:
>
> On Linux (and indeed most if not all POSIX like systems)
> one cannot get a file path from the file descriptor number.
> This is irrespective of programming language used.
While your statement is true generally, it is actually possible so long as
the file descriptor refers to an existing file. Consider:
$ fd2path < main.go
/home/pwaller/.local/src/github.com/pwaller/fd2path/main.go
Code:
package main
import (
"fmt"
"log"
"os"
)
func main() {
fd := os.Stdin.Fd()
fileName, err := os.Readlink(fmt.Sprint("/proc/self/fd/", fd))
if err != nil {
log.Fatal(err)
}
fmt.Println(fileName)
}
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