mincore(2) - NetBSD Manual Pages

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MINCORE(2)                NetBSD Programmer's Manual                MINCORE(2)


NAME

     mincore - determine residency of memory pages


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <sys/mman.h>

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


DESCRIPTION

     The mincore() system call allows a process to obtain information about
     whether pages are core resident.  The status of the memory range is re-
     turned in the character-per-page array vec.  If the page is resident, the
     least significant bit of the corresponding character in vec will be set.
     Other bits are reserved for additional information which future implemen-
     tations may return.

     Note that the status of each page may change between the call to
     mincore() and the return of the page status information.  In order to
     guarantee that pages will remain in core, the address range must be
     locked with mlock(2).


RETURN VALUES

     mincore() returns 0 on success, or -1 on failure and sets the variable
     errno to indicate the error.


ERRORS

     The mincore() call will fail if:

     [EFAULT]      vec points to an illegal address.

     [EINVAL]      addr is not a multiple of the system page size.

     [EINVAL]      len is equal to 0.

     [ENOMEM]      The address range specified is invalid for the calling pro-
                   cess, or one or more of the pages specified in the range
                   are not mapped.


SEE ALSO

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


HISTORY

     The mincore() function first appeared in 4.4BSD.

NetBSD 1.6.2                     June 6, 1999                                1