closefrom
fn
int closefrom(int lowfd)Close every file descriptor equal to or greater than lowfd.
Typically lowfd will be 3, to leave standard input, standard output and standard error open.
This is the same as Linux close_range (lowfd, ~0U, 0), but portable to other OSs and to older versions of Linux. Equivalently, it is the same as BSD closefrom (lowfd), but portable, and async-signal-safe on all OSs.
This function is async-signal safe, making it safe to call from a signal handler or a [glib.types.SpawnChildSetupFunc], as long as lowfd is non-negative. See signal(7)) and
signal-safety(7)) for more details.
Parameters
lowfd | Minimum fd to close, which must be non-negative |
Returns
0 on success, -1 with errno set on error