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Possible to get a non-blocking file descriptor?

Any way to get a file descriptor for polling? Non-blocking preferably.

Add some examples or use-cases

This was a very nice surprise, looks almost exactly like what I need! But how do I use it?
Could you perhaps add a couple of simple example use-cases to the README?

Failed Build For Cygwin

hi and if i want use this on cygwin, i build it but :::::::

c99 -std=c99 -Wall -Wextra -pedantic -O2 -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE  -c -o bus.o bus.c
c99 -std=c99 -Wall -Wextra -pedantic -O2 -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE  -c -o libbus.o libbus.c
libbus.c: In function ‘create_semaphores’:
libbus.c:220:14: error: storage size of ‘values’ isn’t known
  220 |  union semun values;
      |              ^~~~~~
libbus.c:229:11: warning: left shift count >= width of type [-Wshift-count-overflow]
  229 |   r *= (1 << (8 * sizeof(key_t) - 2)) - 1;
      |           ^~
libbus.c:220:14: warning: unused variable ‘values’ [-Wunused-variable]
  220 |  union semun values;
      |              ^~~~~~
libbus.c: In function ‘create_shared_memory’:
libbus.c:280:11: warning: left shift count >= width of type [-Wshift-count-overflow]
  280 |   r *= (1 << (8 * sizeof(key_t) - 2)) - 1;
      |           ^~
libbus.c: In function ‘semaphore_op_timed’:
libbus.c:368:9: warning: implicit declaration of function ‘semtimedop’ [-Wimplicit-function-declaration]
  368 |  return semtimedop(bus->sem_id, &op, (size_t)1, timeout);
      |         ^~~~~~~~~~
libbus.c: In function ‘write_semaphore’:
libbus.c:383:14: error: storage size of ‘semval’ isn’t known
  383 |  union semun semval;
      |              ^~~~~~
libbus.c:383:14: warning: unused variable ‘semval’ [-Wunused-variable]
libbus.c:386:1: warning: control reaches end of non-void function [-Wreturn-type]
  386 | }
      | ^
make: *** [<builtin>: libbus.o] Error 1

in waiting, i can do nc -lU filesocket and nc -U filesocket

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