The glibc/musl select library call doesn't verify nfds is < FD_SETSIZE so you could create your own fd_set as large as you want it. glibc: https://github.com/b

The glibc/musl select library call doesn't verify nfds is < FD_SETSIZE so you could create your own fd_set as large as you want it. glibc: https://github.com/bminor/glibc/blob/master/sysdeps/unix/sysv/linux/select.c https://github.com/bminor/glibc/blob/master/sysdeps/unix/sys... musl: https://git.musl-libc.org/cgit/musl/tree/src/select/select.c https://git.musl-libc.org/cgit/musl/tree/src/select/select.c *BSD allows you to define your own FD_SETSIZE before including system headers.