Creates a FIFO special file with name file_name. mode
specifies the FIFO’s permissions. It is modified by the process’s umask in the usual way: the permissions
of the created file are (mode & ~umask).
static VALUE
rb_file_s_mkfifo(int argc, VALUE *argv)
{
VALUE path;
struct mkfifo_arg ma;
ma.mode = 0666;
rb_check_arity(argc, 1, 2);
if (argc > 1) {
ma.mode = NUM2MODET(argv[1]);
}
path = argv[0];
FilePathValue(path);
path = rb_str_encode_ospath(path);
ma.path = RSTRING_PTR(path);
if (rb_thread_call_without_gvl(nogvl_mkfifo, &ma, RUBY_UBF_IO, 0)) {
rb_sys_fail_path(path);
}
return INT2FIX(0);
}