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MINCORE(2) NetBSD System Calls Manual MINCORE(2)
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mincore -- determine residency of memory pages
Standard C Library (libc, -lc)
mincore(void *addr, size_t len, char *vec);
The mincore() system call tells whether the pages covering len bytes of
data starting at addr are core resident in the process. The status of
the memory range is returned in the character-per-page array vec. If the
page is resident, the least significant bit of the corresponding charac-
ter in vec will be set. Other bits are reserved for additional informa-
tion which future implementations 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).
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
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
process, or one or more of the pages specified in the
range are not mapped.
madvise(2), mlock(2), mprotect(2), msync(2), munmap(2), sysconf(3)
The mincore() function first appeared in 4.4BSD.
NetBSD 9.99 June 6, 1999 NetBSD 9.99