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

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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
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4
Kernel/API/POSIX/sys/mman.h
View file

@ -31,8 +31,8 @@ extern "C" {
#define MAP_FAILED ((void*)-1)
#define MADV_SET_VOLATILE 0x100
#define MADV_SET_NONVOLATILE 0x200
#define MADV_SET_VOLATILE 0x1
#define MADV_SET_NONVOLATILE 0x2
#define MS_SYNC 1
#define MS_ASYNC 2

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;