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  __syscall(2)
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  accept(2)
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  acct(2)
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  aio_cancel(2)
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  fchdir(2)
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  flock(2)
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  fsync(2)
  ftruncate(2)
  futimes(2)
  getdents(2)
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  getegid(2)
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  i386_get_ioperm(2)
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  i386_vm86(2)
  intro(2)
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  mincore(2)
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  mkdir(2)
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  ntp_adjtime(2)
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  open(2)
  pathconf(2)
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  posix_madvise(2)
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  vfork(2)
  wait(2)
  wait3(2)
  wait4(2)
  waitpid(2)
  write(2)
  writev(2)

mincore(2)

NAME

     mincore -- determine residency of memory pages


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <sys/mman.h>

     int
     mincore(const void *addr, size_t len, char *vec);


DESCRIPTION

     The mincore() system call determines whether each of the pages in the
     region beginning at addr and continuing for len bytes is resident.  The
     status is returned in the vec array, one character per page.  Each char-
     acter is either 0 if the page is not resident, or a combination of the
     following flags (defined in <sys/mman.h>):

     MINCORE_INCORE	       Page is in core (resident).

     MINCORE_REFERENCED        Page has been referenced by us.

     MINCORE_MODIFIED	       Page has been modified by us.

     MINCORE_REFERENCED_OTHER  Page has been referenced.

     MINCORE_MODIFIED_OTHER    Page has been modified.

     The information returned by mincore() may be out of date by the time the
     system call returns.  The only way to ensure that a page is resident is
     to lock it into memory with the mlock(2) system call.


RETURN VALUES

     The mincore() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.


ERRORS

     The mincore() system call will fail if:

     [EINVAL]		The virtual address range specified by the addr and
			len arguments is not valid.

     [EFAULT]		The vec argument points to an illegal address.


SEE ALSO

     madvise(2), mlock(2), mprotect(2), msync(2), munmap(2), getpagesize(3)


HISTORY

     The mincore() system call first appeared in 4.4BSD.

FreeBSD 5.4		       January 17, 2003 		   FreeBSD 5.4

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