closefrom
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 callback@GLib.SpawnChildSetupFunc, as long as @lowfd is non-negative. See man:signal(7) and man:signal-safety(7) for more details.
Return
0 on success, -1 with errno set on error
Since
2.80
Parameters
lowfd
Minimum fd to close, which must be non-negative