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minherit(2) [opendarwin man page]

MINHERIT(2)						      BSD System Calls Manual						       MINHERIT(2)

NAME
minherit -- control the inheritance of pages SYNOPSIS
#include <sys/types.h> #include <sys/mman.h> int minherit(caddr_t addr, size_t len, int inherit); DESCRIPTION
The minherit() system call changes the specified pages to have the inheritance characteristic inherit, which can be set to VM_INHERIT_NONE, VM_INHERIT_COPY, or VM_INHERIT_SHARE. Not all implementations will guarantee that the inheritance characteristic can be set on a page basis; the granularity of changes may be as large as an entire region. SEE ALSO
madvise(2), mincore(2), mprotect(2), msync(2), munmap(2) HISTORY
The minherit() function first appeared in OpenBSD. BSD
June 9, 1993 BSD

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MINHERIT(2)						      BSD System Calls Manual						       MINHERIT(2)

NAME
minherit -- control the inheritance of pages LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/mman.h> int minherit(void *addr, size_t len, int inherit); DESCRIPTION
The minherit() system call changes the specified range of virtual addresses to have the specified fork-time inheritance characteristic inherit, which can be set to MAP_INHERIT_NONE, MAP_INHERIT_COPY, or MAP_INHERIT_SHARE. Also possible is MAP_INHERIT_DEFAULT, which defaults to MAP_INHERIT_COPY. Not all implementations will guarantee that the inheritance characteristic can be set on a page basis; the granularity of changes may be as large as an entire region. Normally, the entire address space is marked MAP_INHERIT_COPY; when the process calls fork(), the child receives a (virtual) copy of the entire address space. Pages or regions marked MAP_INHERIT_SHARE are shared between the address spaces, while pages or regions marked MAP_INHERIT_NONE will be unmapped in the child. RETURN VALUES
The minherit() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi- cate the error. ERRORS
minherit() will fail if: [EINVAL] An invalid region or invalid parameters were specified. SEE ALSO
fork(2), madvise(2), mincore(2), mprotect(2), msync(2), munmap(2) HISTORY
The minherit() function first appeared in OpenBSD. BUGS
If a particular port does not support page-granularity inheritance, there's no way to figure out how large a region is actually affected by minherit(). BSD
October 7, 2006 BSD
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