open_pipe

Similar to the UNIX pipe call, but on modern systems like Linux uses the pipe2 system call, which atomically creates a pipe with the configured flags.

As of GLib 2.78, the supported flags are `O_CLOEXEC`/`FD_CLOEXEC` (see below) and `O_NONBLOCK`. Prior to GLib 2.78, only `FD_CLOEXEC` was supported — if you wanted to configure `O_NONBLOCK` then that had to be done separately with `fcntl()`.

Since GLib 2.80, the constants g_unix_pipe_end_read and g_unix_pipe_end_write can be used as mnemonic indexes in fds.

It is a programmer error to call this function with unsupported flags, and a critical warning will be raised.

As of GLib 2.78, it is preferred to pass `O_CLOEXEC` in, rather than `FD_CLOEXEC`, as that matches the underlying `pipe()` API more closely. Prior to 2.78, only `FD_CLOEXEC` was supported. Support for `FD_CLOEXEC` may be deprecated and removed in future.

Parameters:

fds	Array of two integers
flags	Bitfield of file descriptor flags, as for fcntl

Returns:

true on success, false if not (and errno will be set).