RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 22:27:35 +00:00
Code Issues Activity Actions

LibC: Make the madvise advice field a value instead of a bitfield

Browse source 
The advices are almost always exclusive of one another, and while POSIX
does not define madvise, most other unix-like and *BSD systems also only
accept a singular value per call.
This commit is contained in:
Idan Horowitz 2021-10-28 20:57:53 +03:00
parent 48f92f6482
commit fc13d0782f
2 changed files with 4 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Kernel/Syscalls/mmap.cpp
View file

@ -424,18 +424,14 @@ ErrorOr<FlatPtr> Process::sys$madvise(Userspace<void*> address, size_t size, int
return EINVAL;
if (!region->is_mmap())
return EPERM;
bool set_volatile = advice & MADV_SET_VOLATILE;
bool set_nonvolatile = advice & MADV_SET_NONVOLATILE;
if (set_volatile && set_nonvolatile)
return EINVAL;
if (set_volatile || set_nonvolatile) {
if (advice == MADV_SET_VOLATILE || advice == MADV_SET_NONVOLATILE) {
if (!region->vmobject().is_anonymous())
return EINVAL;
auto& vmobject = static_cast<Memory::AnonymousVMObject&>(region->vmobject());
if (!vmobject.is_purgeable())
return EINVAL;
bool was_purged = false;
TRY(vmobject.set_volatile(set_volatile, was_purged));
TRY(vmobject.set_volatile(advice == MADV_SET_VOLATILE, was_purged));
return was_purged ? 1 : 0;
}
return EINVAL;