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vm_map_stack (9)

>> vm_map_stack (9) ( FreeBSD man: Ядро )

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NAME



vm_map_stack

 
vm_map_growstack

 - manage process stacks

SYNOPSIS

   #include <sys/param.h>
   #include <vm/vm.h>
   #include <vm/vm_map.h>
int Fo vm_map_stack Fa vm_map_t map vm_offset_t addrbos vm_size_t max_ssize vm_prot_t prot Fa vm_prot_t max int cow Fc Ft int vm_map_growstack (struct proc *p vm_offset_t addr);

DESCRIPTION

The vm_map_stack ();
function maps a process stack for a new process image. The stack is mapped Fa addrbos in Fa map , with a maximum size of Fa max_ssize . Copy-on-write flags passed in Fa cow are also applied to the new mapping. Protection bits are supplied by Fa prot and Fa max .

It is typically called by execve(2).

The vm_map_growstack ();
function is responsible for growing a stack for the process Fa p to the desired address Fa addr , similar to the legacy sbrk(2) call.

IMPLEMENTATION NOTES

The vm_map_stack ();
function calls vm_map_insert9 to create its mappings.

The vm_map_growstack ();
function acquires the Giant lock, and the process lock on Fa p , for the duration of the call.

RETURN VALUES

The vm_map_stack ();
function returns KERN_SUCCESS if the mapping was allocated successfully.

Otherwise, if mapping the stack would exceed the process's VMEM resource limit, or if the specified bottom-of-stack address is out of range for the map, or if there is already a mapping at the address which would result, or if Fa max_ssize could not be accommodated within the current mapping, KERN_NO_SPACE is returned.

Other possible return values for this function are documented in vm_map_insert9.

The vm_map_growstack ();
function returns KERN_SUCCESS if Fa addr is already mapped, or if the stack was grown successfully.

It also returns KERN_SUCCESS if Fa addr is outside the stack range; this is done in order to preserve compatibility with the deprecated grow ();
function previously located in the file vm_machdep.c