i386_set_ldt

Function - Set per-thread segment descriptors.

SYNOPSIS

kern_return_t   i386_set_ldt
                (thread_act_t                        target_act,
                 int                             first_selector,
                 descriptor_list_t                    desc_list);

PARAMETERS

target_act

[in thread send right] Thread whose segment descriptors are to be set.

first_selector

[in scalar] Selector value (segment register value) corresponding to the first segment whose descriptor is to be set.

desc_list

[pointer to in array of descriptor_t] Array of segment descriptors. The following forms are permitted:

• Empty descriptor. The ACC_P flag (segment present) may or may not be set.

• ACC_CALL_GATE--Converted into a system call gate. The ACC_P flag must be set.

All other descriptors must have both the ACC_P flag set and specify user mode access (ACC_PL_U).

• ACC_DATA.

• ACC_DATA_W.

• ACC_DATA_E.

• ACC_DATA_EW.

• ACC_CODE.

• ACC_CODE_R.

• ACC_CODE_C.

• ACC_CODE_CR.

• ACC_CALL_GATE_16.

• ACC_CALL_GATE.

DESCRIPTION

The i386_set_ldt function allows a thread to have a private local descriptor table (LDT) which allows its local segments to map various ranges of its address space.

RETURN VALUES

Only generic errors apply.

RELATED INFORMATION

Functions: i386_get_ldt.