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mincore(2) [osx man page]

MINCORE(2)						      BSD System Calls Manual							MINCORE(2)

mincore -- determine residency of memory pages SYNOPSIS
#include <sys/types.h> #include <sys/mman.h> int mincore(caddr_t addr, size_t len, char *vec); DESCRIPTION
The mincore() system call allows a process to obtain information about whether pages are core resident. The current core residency of the pages is returned in the character array vec. For each entry in the character array vec, the following bit values may be set depending upon the state of the page: MINCORE_INCORE 0x1 /* Page is incore */ MINCORE_REFERENCED 0x2 /* Page has been referenced by us */ MINCORE_MODIFIED 0x4 /* Page has been modified by us */ MINCORE_REFERENCED_OTHER 0x8 /* Page has been referenced */ MINCORE_MODIFIED_OTHER 0x10 /* Page has been modified */ RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
[EINVAL] addr is not a valid address for user mode. [EFAULT] an error occurred trying to copy to the output character array vec. SEE ALSO
madvise(2), minherit(2), mlock(2), mprotect(2), msync(2), munmap(2) HISTORY
The mincore() function first appeared in 4.4BSD. BSD
June 9, 1993 BSD

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

mincore - get information on whether pages are in core SYNOPSIS
#include <unistd.h> #include <sys/mman.h> int mincore(void *start, size_t length, unsigned char *vec); DESCRIPTION
The mincore function requests a vector describing which pages of a file are in core and can be read without disk access. The kernel will supply data for length bytes following the start address. On return, the kernel will have filled vec with bytes, of which the least signif- icant bit indicates if a page is core resident. For mincore to return successfully, start must lie on a page boundary. It is the caller's responsibility to round up to the nearest page. The length parameter need not be a multiple of the page size. The vector vec must be large enough to contain length/PAGE_SIZE bytes. One may obtain the page size from getpagesize(2). RETURN VALUE
On success, mincore returns zero. On error, -1 is returned, and errno is set appropriately. ERRORS
EAGAIN kernel is temporarily out of resources EINVAL start is not a multiple of the page size, or len has a non-positive value EFAULT vec points to an invalid address ENOMEM address to address + length contained unmapped memory, or memory not part of a file. BUGS
mincore should return a bit vector and not a byte vector. As of Linux 2.4.5, it is not possible to gain information on the core residency of pages which are not backed by a file. In other words, calling mincore on an region returned by an anonymous mmap(2) does not work and sets errno to ENOMEM. Unless pages are locked in memory, the contents of vec may be stale by the time they reach userspace. CONFORMING TO
mincore does not appear to be part of POSIX or the Single Unix Specification. HISTORY
The mincore() function first appeared in 4.4BSD. AVAILABILITY
Since Linux 2.3.99pre1 and glibc 2.2. SEE ALSO
getpagesize(2), mmap(2) Linux 2.4.5 2001-06-03 MINCORE(2)
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