### Function

# GLib fdwalk_set_cloexec

since: 2.80

#### Declaration

    int
    g_fdwalk_set_cloexec (
      int lowfd
    )

#### Description

Mark every file descriptor equal to or greater than `lowfd` to be closed at the next `execve()` or similar, as if via the `FD_CLOEXEC` flag.

Typically `lowfd` will be 3, to leave standard input, standard output and standard error open after exec.

This is the same as Linux `close_range (lowfd, ~0U, CLOSE_RANGE_CLOEXEC)`, but portable to other OSs and to older versions of Linux.

This function is async-signal safe, making it safe to call from a signal handler or a `GSpawnChildSetupFunc`, as long as `lowfd` is non-negative. See `signal(7)` and `signal-safety(7)` for more details.

Available since: 2.80

#### Parameters

`lowfd`

  Type: `int`

  Minimum fd to act on, which must be non-negative.

#### Return value

Type: `int`

0 on success, -1 with errno set on error.