def add_close_childfds(self, start_fd, except_fd=-1):
"""Add to a SpawnFileAction a series of 'closes' that will close all of
the fds >= startfd in the child process. A single fd may be skipped,
provided that it is given as the optional except argument."""
if not isinstance(start_fd, int):
raise TypeError("start_fd must be int type")
if not isinstance(except_fd, int):
raise TypeError("except_fd must be int type")
# Set up walk_data for fdwalk.
wd = ffi.new("walk_data *", [0])
wd.skip_fd = ffi.cast("int", except_fd)
wd.start_fd = ffi.cast("int", start_fd)
wd.fap = self.fa
# Perform the walk.
lib.fdwalk(walk_func, wd)
def walk_func(data, fd):
wd = ffi.cast("walk_data *", data)
if fd >= wd.start_fd and fd != wd.skip_fd:
rc = lib.posix_spawn_file_actions_addclose(wd.fap, fd)
_check_error(rc)
return 0
