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Kernel: Add MADV_GET_VOLATILE for checking the volatile flag

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Sometimes you might want to know if a purgeable region is volatile.
This commit is contained in:
Andreas Kling 2019-12-18 20:48:24 +01:00
parent 1ad5568759
commit 487f9b373b
3 changed files with 8 additions and 0 deletions
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6
Kernel/Process.cpp
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@ -363,6 +363,12 @@ int Process::sys$madvise(void* address, size_t size, int advice)
vmobject.set_was_purged(false); vmobject.set_was_purged(false);
return was_purged ? 1 : 0; return was_purged ? 1 : 0;
} }
if (advice & MADV_GET_VOLATILE) {
if (!region->vmobject().is_purgeable())
return -EPERM;
auto& vmobject = static_cast<PurgeableVMObject&>(region->vmobject());
return vmobject.is_volatile() ? 0 : 1;
}
return -EINVAL; return -EINVAL;
} }

1
Kernel/UnixTypes.h
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@ -36,6 +36,7 @@
#define MADV_SET_VOLATILE 0x100 #define MADV_SET_VOLATILE 0x100
#define MADV_SET_NONVOLATILE 0x200 #define MADV_SET_NONVOLATILE 0x200
#define MADV_GET_VOLATILE 0x400
#define F_DUPFD 0 #define F_DUPFD 0
#define F_GETFD 1 #define F_GETFD 1

1
Libraries/LibC/mman.h
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@ -20,6 +20,7 @@
#define MADV_SET_VOLATILE 0x100 #define MADV_SET_VOLATILE 0x100
#define MADV_SET_NONVOLATILE 0x200 #define MADV_SET_NONVOLATILE 0x200
#define MADV_GET_VOLATILE 0x400
__BEGIN_DECLS __BEGIN_DECLS