Copy_to_user return value
This function may sleep. Description. Copy data from user space to kernel space. Returns number of bytes that could not be copied. On success, this ... ,User context only. This function may sleep. Description. Copy data from kernel space to user space. Returns number of bytes that could not be copied ... , It took quite a bit of debugging, but in the end Tsyvarev's hint (the comment about not calling copy_to_user with a spinlock taken) seems to have ..., What user-space interface do you use for communication? Regardless what user space interface you use (chardev, ioctl, ...), the signature of ..., If I understood your question right you have to return -EFAULT which accordingly to manual page means. EFAULT The address pointed to by ...,Here is the description of the return value. unsigned long copy_from_user (void *to, const void __user *from, unsigned long count) The return value is the ... , The copy_from_user function can fail for various reasons (typically because of an invalid address), copying only part of the requested data, ..., Like get_user , it accepts a variable (which contains the value to write) and a ... As with copy_to_user , the function returns zero on success and ..., Linux Device Driver - IOCTL (copy_to_user & copy_from_user) 在linux/include/linux/fs.h. ... return 0; } // mainly io control between user and kernel // args are pointed ... num 是XNUM命令時要change的value (default 是10 )
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 Copy_to_user return value 相關參考資料
copy_from_user
This function may sleep. Description. Copy data from user space to kernel space. Returns number of bytes that could not be copied. On success, this ... https://www.fsl.cs.sunysb.edu copy_to_user
User context only. This function may sleep. Description. Copy data from kernel space to user space. Returns number of bytes that could not be copied ... https://www.fsl.cs.sunysb.edu copy_to_user returns an error in a char device read function ...
It took quite a bit of debugging, but in the end Tsyvarev's hint (the comment about not calling copy_to_user with a spinlock taken) seems to have ... https://stackoverflow.com Linux- copy_to_user not working, always return the buffer size ...
What user-space interface do you use for communication? Regardless what user space interface you use (chardev, ioctl, ...), the signature of ... https://stackoverflow.com Passing return value to setsockopts() caller if copy_to_user ...
If I understood your question right you have to return -EFAULT which accordingly to manual page means. EFAULT The address pointed to by ... https://stackoverflow.com return value of copy_from_user() - linux - jQuery - sql
Here is the description of the return value. unsigned long copy_from_user (void *to, const void __user *from, unsigned long count) The return value is the ... https://jquery.developreferenc return value of copy_from_user() - Stack Overflow
The copy_from_user function can fail for various reasons (typically because of an invalid address), copying only part of the requested data, ... https://stackoverflow.com User space memory access from the Linux kernel – Build ...
Like get_user , it accepts a variable (which contains the value to write) and a ... As with copy_to_user , the function returns zero on success and ... https://developer.ibm.com [轉貼] Linux Device Driver - IOCTL (copy_to_user ... - 只是記事本
Linux Device Driver - IOCTL (copy_to_user & copy_from_user) 在linux/include/linux/fs.h. ... return 0; } // mainly io control between user and kernel // args are pointed ... num 是XNUM命令時要change... https://mybeauty.pixnet.net |