Someone from Intel please answer this: Im trying to write a wrapper for the ioctl commands to mimic the kernel level API for the uDbg library. The function Im working w/ is int uDbg_SetNumUword(uDbg_Handle_T dbgH, unsigned int uEngMask, unsigned int uWordAddr, unsigned short numWords, unsigned int *uWord) Inside SA1_CoreLibs/ue/main.c where the ioctl is actually handled, we find this code: case UENG_SETNUMUWORD: { uEng_setNumUword_T d; if (copy_from_user(&d, (void *)arg, sizeof(d))) return -EFAULT; size = d.numWords * sizeof(unsigned int); buf = kmalloc(size, GFP_KERNEL); if (buf == NULL) return -ENOMEM; if (copy_from_user(buf, (void *)d.uWord, size)) { kfree(buf); return -EFAULT; } if (uEng_setNumUword(d.uEng, d.uAddr, d.numWords, &d.uWord)) { printk("ue: UENG_SETNUMUWORD failed\n"); kfree(buf); return -EFAULT; } kfree(buf); break; } and SA1_CoreLibs/debug_1200/debug_1200.hxx defines Debug_SetNumUword_T to be typedef struct Debug_SetNumUword_S{ unsigned int uEngMask; unsigned int uWordAddr; unsigned short numWords; unsigned int uWord; } Debug_SetNumUword_T; But this cant be right---isnt the purpose of buf to copy the data from the POINTER uWord (whereas now its not a pointer, its just and int) AND shouldn't buf be passed to uEng_setNumUword instead of &d.uWord inside the case statement? Let me know if Im an idiot or if this has been fixed in a newer version... Austen McDonald austen@cc.gatech.edu God does not care about our mathematical difficulties. He integrates empirically. -- Albert Einstein