Copy_from_user return value
copy_from_user Objective function is to copy data from user space to the kernel space, not failed to return ... That flag is __range_ok The return value. ,A return value of 0 indicates a successful copy. Why do you want to print the buffer as string i.e using %s in printk(). Is buff a character string in the ... ,Re: copy_from_user returns a positive value? From: David S. Miller ([email protected]) Date: Fri Feb 15 2002 - 18:24:55 EST. ,2016年6月29日 — copy_to_user内核空间与用户空间数据传递的通道是copy_to_user和copy_from_user，刚开始使用时对他们的返回值非常困惑。按照”常理”，返回值应该是copy ... ,2019年3月1日 — I have printed the results (i.e. data array) in the read_func and can see that the read is expected value , but when after copy_to_user, when I ... ,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 ... ,So with the function copy_from_user(), the user space to the kernel space is copied. ... so if the full copy is successful, the return value is 0. ,The copy_from_user function can fail for various reasons (typically because of an invalid address), copying only part of the requested data, ... ,2019年9月17日 — It seems that they always return 0 . static inline int copy_from_user(void *to, const void __user ... ,Copy data from kernel space to user space. Caller must check the specified block with access_ok before calling this function. Returns number of bytes that ...
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 Copy_from_user return value 相關參考資料
copy_from_user analysis - Programmer Sought
copy_from_user Objective function is to copy data from user space to the kernel space, not failed to return ... That flag is __range_ok The return value. https://www.programmersought.c copy_from_user function prints junk values - Stack Overflow
A return value of 0 indicates a successful copy. Why do you want to print the buffer as string i.e using %s in printk(). Is buff a character string in the ... https://stackoverflow.com copy_from_user returns a positive val - Linux-Kernel Archive: Re
Re: copy_from_user returns a positive value? From: David S. Miller ([email protected]) Date: Fri Feb 15 2002 - 18:24:55 EST. http://lkml.iu.edu copy_to_user copy_from_user返回值_andylauren的专栏 ...
2016年6月29日 — copy_to_user内核空间与用户空间数据传递的通道是copy_to_user和copy_from_user，刚开始使用时对他们的返回值非常困惑。按照”常理”，返回值应该是copy ... https://blog.csdn.net copy_to_user does not return expected data - Stack Overflow
2019年3月1日 — I have printed the results (i.e. data array) in the read_func and can see that the read is expected value , but when after copy_to_user, when I ... https://stackoverflow.com 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 ... https://stackoverflow.com Copy_to_user() and copy_from_user() functions in linux ...
So with the function copy_from_user(), the user space to the kernel space is copied. ... so if the full copy is successful, the return value is 0. https://www.programmersought.c 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 When does copy_fromto_user returns a non-zero value ...
2019年9月17日 — It seems that they always return 0 . static inline int copy_from_user(void *to, const void __user ... https://stackoverflow.com __copy_to_user
Copy data from kernel space to user space. Caller must check the specified block with access_ok before calling this function. Returns number of bytes that ... https://www.kernel.org |