c - How to transmit data from an interrupt handler to an user application? -

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a device produces interrupt managed handler in kernel. need send message flag, user application receives notification of interruption has occurred, , can perform procedure. example, wake process. how do this?

imho posix style solution write device driver receives interrupts in kernel. user space program open device file , icoctl() or read() it, blocking until @ least 1 event had arrived. suggest, user space program should read bit more:

  • how many events have arrived far?)
  • has call blocked (e.g. there no events queued when reading device)

this you, see when program misisng events (e.g. because has ben deleayed in previous cycle).


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