AIX 5L v5.2 Technical Reference: Kernel and Subsystems

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This booklet presents information regarding kernel providers, gadget motive force operations, dossier approach operations, subroutines, the configuration subsystem, the communications subsystem, the low functionality terminal (LFT) subsystem, the logical quantity subsystem, the M-audio catch and playback adapter subsystem, the printer subsystem, the SCSI subsystem, and the serial DASD subsystem.This e-book is a part of the six-volume technical reference set, AIX 5L model 5.2 Technical Reference, that gives info on method calls, kernel extension calls, and subroutines within the following volumes: * AIX 5L model 5.2 Technical Reference: Base working approach and Extensions quantity 1 and AIX 5L model 5.2 Technical Reference: Base working procedure and Extensions quantity 2 supply info on procedure calls, subroutines, services, macros, and statements linked to base working process runtime companies. * AIX 5L model 5.2 Technical Reference: Communications quantity 1 and AIX 5L model 5.2 Technical Reference: Communications quantity 2 supply info on access issues, capabilities, method calls, subroutines, and operations regarding communications companies. * AIX 5L model 5.2 Technical Reference: Kernel and Subsystems quantity 1 and AIX 5L model 5.2 Technical Reference: Kernel and Subsystems quantity 2 offer information regarding kernel companies, machine driving force operations, dossier process operations, subroutines, the configuration subsystem, the communications subsystem, the low functionality terminal (LFT) subsystem, the logical quantity subsystem, the M-audio catch and playback adapter subsystem, the printer subsystem, the SCSI subsystem, and the serial DASD subsystem.

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This service is provided so that system calls and device driver top half routines can safely access user data. The copyin64 service ensures that the user has the appropriate authority to access the data. It also provides recovery from paging I/O errors that would otherwise cause the system to crash. 44 Technical Reference: Kernel and Subsystems, Volume 1 This service will operate correctly for both 32-bit and 64-bit user address spaces. The uaddr64 parameter is interpreted as being a non-remapped 32-bit address for the case where the current user address space is 32- bits.

Specifies the address of user data. Specifies the number of bytes to copy. Chapter 1. Kernel Services 47 Description The copyout service copies the specified number of bytes from kernel memory to user memory. It is provided so that system calls and device driver top half routines can safely access user data. The copyout service ensures that the user has the appropriate authority to access the data. This service also provides recovery from paging I/O errors that would otherwise cause the system to crash.

Points to a var structure representing the current values of system-configurable variables. Points to a var structure representing the new or proposed values of system-configurable variables. The cur and new var structures are both in the system address space. Description The configuration notification control block contains the address of a notification routine. This structure is intended to be used as a list element in a list of similar control blocks maintained by the kernel. Each control block has the following definition: struct cfgncb { struct cfgncb *cbnext; struct cfgncb *cbprev; int (*func)(); }; /* next block on chain */ /* prev control block on chain */ /* notification function */ The cfgndel or cfgnadd kernel service can be used to add or delete a cfgncb control block from the cfgncb list.

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