Messages in this thread | | | From | "Lee, Shuyu" <> | Subject | How to notify a user process from within a driver | Date | Thu, 1 May 2003 15:23:04 -0400 |
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Hello, All.
I am working on a device driver. One of the features of the hardware is multi-channel I/O control. In order for a user process to communicate with the hardware, my design is for the user process to call the driver's ioctl to register a semaphore for each I/O channel, then wait on them. When the hardware detects an input, the ISR then BH will wake up the user process. This sounds straightforward in principle. Because there are two types of semaphores in Linux (one for kernel, and one for user), I am not sure how this can be accomplished. Any help would be greatly appreciated.
My development environment is: 1) OS: RedHat 7.2 (Linux 2.4.7), 2) gcc: 3.2.1, 3) PC: one P-III (HP kayak) with 128Mbyte of memory, 4) Bus: PCI.
Shuyu
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