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munmap() and do_munmap(): Removing an Address Interval
The do_munmap() function removes an address interval from a specified process address space. The function is declared in <linux/mm.h>:
int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
The first parameter specifies the address space from which the interval starting at address start of length len bytes is removed. On success, zero is returned. Otherwise, a negative error code is returned.
The munmap() System Call
The munmap() system call is exported to user-space as a means to allow processes to remove address intervals from their address space; it is the complement of the mmap() system call:
int munmap(void *start, size_t length)
The system call is defined in mm/mmap.c and acts as a very simple wrapper to do_munmap():
asmlinkage long sys_munmap(unsigned long addr, size_t len)
{
int ret;
struct mm_struct *mm;
mm = current->mm;
down_write(&mm->mmap_sem);
ret = do_munmap(mm, addr, len);
up_write(&mm->mmap_sem);
return ret;
}
