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#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
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.
The vm_map_stack() and vm_map_growstack() functions acquire the process lock on p for the duration of the call.
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 accommodated 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.
VM_MAP_STACK (9) | January 11, 2013 |
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