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VM_MAP_STACK (9) \| Kernel routines \| Unix Manual Pages \| :man▋ NAME vm_map_stack, vm_map_growstack - manage process stacks CONTENTS Synopsis Description Implementation Notes Return Values See Also Authors SYNOPSIS .In sys/param.h .In vm/vm.h .In vm/vm_map.h int .Fo vm_map_stack "vm_map_t map" "vm_offset_t addrbos" "vm_size_t max_ssize" "vm_prot_t prot" "vm_prot_t max" "int cow" .Fc 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 addrbos* in map, with a maximum size of max_ssize. Copy-on-write flags passed in cow are also applied to the new mapping. Protection bits are supplied by prot and max. It is typically called by execve(2). The `vm_map_growstack` function is responsible for growing a stack for the process p to the desired address addr, similar to the legacy sbrk(2) call. IMPLEMENTATION NOTES The `vm_map_stack` function calls vm_map_insert(9) to create its mappings. The `vm_map_growstack` function acquires the Giant lock, and the process lock on 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 max_ssize could not be accomodated within the current mapping, `KERN_NO_SPACE` is returned. Other possible return values for this function are documented in vm_map_insert(9). The `vm_map_growstack` function returns `KERN_SUCCESS` if addr is already mapped, or if the stack was grown successfully. It also returns `KERN_SUCCESS` if 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`. SEE ALSO vm_map(9), vm_map_insert(9) AUTHORS

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