QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
When writing to a file within an interrupt, the QNX4 program segfaults |
| Ref. No. |
QNX.000010196 |
| Category(ies) |
Development |
| Issue |
I'm writing a progam that services interrupts from an add-on card, kicks a proxy, reads 4 bytes of data from the card and then writes it to a file (SanDisk). When using fwrite the program segfaults after about 1000 interrupts. when using write, it segfaults randomly. Are the any issues/bugs with interrupts and writing to files?x0d
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| Solution |
The functions 'write' and 'fwrite' are not interupt safe. You shouldn'tx0d make any kernel calls from within an interupt. Use IPC (Interprocess Communication) to get a process to do the dirty work for your interrupt handler.
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