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Kernel+LibC: Add minherit() and MAP_INHERIT_ZERO

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This patch adds the minherit() syscall originally invented by OpenBSD.
Only the MAP_INHERIT_ZERO mode is supported for now. If set on an mmap
region, that region will be zeroed out on fork().
This commit is contained in:
Andreas Kling 2020-04-12 20:22:26 +02:00
parent dd00175ae2
commit c19b56dc99
8 changed files with 58 additions and 1 deletions
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6
Libraries/LibC/mman.cpp
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@ -81,4 +81,10 @@ int madvise(void* address, size_t size, int advice)
int rc = syscall(SC_madvise, address, size, advice);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int minherit(void* address, size_t size, int inherit)
{
int rc = syscall(SC_minherit, address, size, inherit);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}

3
Libraries/LibC/mman.h
View file

@ -49,6 +49,8 @@
#define MADV_SET_NONVOLATILE 0x200
#define MADV_GET_VOLATILE 0x400
#define MAP_INHERIT_ZERO 1
__BEGIN_DECLS
void* mmap(void* addr, size_t, int prot, int flags, int fd, off_t);
@ -58,5 +60,6 @@ int munmap(void*, size_t);
int mprotect(void*, size_t, int prot);
int set_mmap_name(void*, size_t, const char*);
int madvise(void*, size_t, int advice);
int minherit(void*, size_t, int inherit);
__END_DECLS