Initialize structures used by the REMAP macro to call the __remap subroutine.
#include <sys/types.h> #include <sys/errno.h> #include <sys/remap.h>
REMAP_SETUP(remap_num, remap_addr) int remap_num; void * remap_addr;
REMAP_SETUP_WITH_LEN(remap_num, remap_addr, length) int remap_num; void * remap_addr; unsigned int length;
The REMAP_SETUP macro initializes the structures used by the REMAP macro to call the __remap subroutine. This macro should be used in conjunction with the REMAP_DCL(), REMAP(), REMAPPED(), and REMAP_HANDLEx macros. The macro depends on the structures declared by REMAP_DCL.
Here is an example of the usage of REMAP_SETUP:
int
naccept (int s,
struct sockaddr * name,
int * anamelan)
{
REMAP_DCL (2); <--2 addrs to remap
int rc;
REMAP_SETUP_WITH_LEN(0, name, *anamelan); <--1st addr, explicit len
REMAP_SETUP (1, anamelen); <--2nd addr, implied len
REMAP (3); <-------+------------------3 parameters to pass
V
rc = __naccept (REMAP_HANDLE3, s, REMAPPED(0), REMAPPED(1));
return rc; ^ ^
} | |
1st remapped addr 2nd remapped addr
In the example shown, there are 2 addresses to be remapped (name and anamelen). REMAP_DCL(2) is used to declare the structures necessary for the remapping of 2 addresses. The first address range to be remapped (name) is defined to be of length *anamelen. Therefore REMAP_SETUP_WITH_LEN is called to set up the first remapping (remapping #0) so the length can be specified. The length of the 2nd range (remapping #1) is implied by the type (int), so REMAP_SETUP is used.
REMAP is then called, and nparms is 3 since there are a total of 3 parameters for the naccept system call. Finally, the 32-bit system call is called passing the remap_handle structure followed by the parameters, including the remapped addresses. The REMAP_HANDLE3 macro is used to pass the remap_handle structure appropriate for a system call with 3 parameters. The REMAPPED macros are used to pass remapped address #0 (name) and remapped address #1 (anamelen).
This service may only be called from a 64-bit user process.
| remap_num | the sequential number (count starts at 0) indicating which remapping this is. |
| remap_addr | the address of the start of the range to be remapped. |
| length | the size of the address range to be remapped. |
Since REMAP_SETUP is a statement and not an expression, it has no return value.
The REMAP_SETUP macro is defined in sys/remap.h.
The REMAP macro, REMAP_DCL macro, __remap subroutine, remap_64 kernel service, the as_remap64 kernel service, the as_unremap64 kernel service.
Memory Kernel Services and Understanding Virtual Memory Manager Interfaces in AIX Version 4 Kernel Extensions and Device Support Programming Concepts.