Function nc::mincore

pub fn mincore(start: usize, len: size_t, vec: *const u8) -> Result<(), Errno>

mincore() returns the memory residency status of the pages in the current process's address space specified by [addr, addr + len). The status is returned in a vector of bytes. The least significant bit of each byte is 1 if the referenced page is in memory, otherwise it is zero.

Because the status of a page can change after mincore() checks it but before it returns to the application, the returned vector may contain stale information. Only locked pages are guaranteed to remain in memory.

return values: zero - success -EFAULT - vec points to an illegal address -EINVAL - addr is not a multiple of PAGE_SIZE -ENOMEM - Addresses in the range [addr, addr + len] are invalid for the address space of this process, or specify one or more pages which are not currently mapped -EAGAIN - A kernel resource was temporarily unavailable.