Provided by: freebsd-manpages_6.2-1_all
vm_map_stack, vm_map_growstack - manage process stacks
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);
vm_map_growstack(struct proc *p, vm_offset_t addr);
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)
The vm_map_stack() function calls vm_map_insert(9) to create its
The vm_map_growstack() function acquires the Giant lock, and the process
lock on p, for the duration of the call.
The vm_map_stack() function returns KERN_SUCCESS if the mapping was
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
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.
This manual page was written by Bruce M Simpson 〈email@example.com〉.