Copies data between user and kernel memory.
#include <sys/types.h> #include <sys/ernno.h> #include <sys/uio.h> int copyinstr64 (from64, to, max, actual); unsigned long long from64; caddr_t to; uint max; uint * actual;
| from64 | Specifies the address of character string to copy. |
| to | Specifies the address to which the character string is to be copied. |
| max | Specifies the number of characters to be copied. |
| actual | Specifies a parameter, passed by reference, that is updated by the copyinstr64 service with the actual number of characters copied. |
The copyinstr64 service permits a user to copy character data from one location to another. The source location must be in user space or can be in kernel space if the caller is a kernel process. The destination is in kernel space.
This service will operate correctly for both 32-bit and 64-bit user address spaces. The from64 parameter is interpreted as being a non-remapped 32-bit address for the case where the current user address space is 32- bits. If the current user address space is 64-bits, then from64 is treated as a 64-bit address.
The copyinstr64 kernel service can be called from the process environment only.
| 0 | Indicates a successful operation. |
| E2BIG | Indicates insufficient space to complete the copy. |
| EIO | Indicates that a permanent I/O error occurred while referencing data. |
| ENOSPC | Indicates insufficient file system or paging space. |
| EFAULT | Indicates that the user has insufficient authority to access the data, or the address specified in the from64 parameter is not valid. |
The copyinstr64 kernel service and copyout64 kernel service.
Accessing User-Mode Data While in Kernel Mode and Memory Kernel Services in AIX 5L Version 5.2 Kernel Extensions and Device Support Programming Concepts.