Public APIs to provide rb_fd_select().
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- Ruby developers ruby-.nosp@m.core.nosp@m.@ruby.nosp@m.-lan.nosp@m.g.org
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Several Unix platforms support file descriptors bigger than FD_SETSIZE in select(2) system call.
When fd_set is not big enough to hold big file descriptors, it should be allocated dynamically. Note that this assumes fd_set is structured as bitmap.
rb_fd_init allocates the memory. rb_fd_term frees the memory. rb_fd_set may re-allocate bitmap.
So rb_fd_set doesn't reject file descriptors bigger than FD_SETSIZE.
Definition in file largesize.h.