NAME
mman — memory mapping definitions
DESCRIPTION
The
<sys/mman.h>
header defines the following symbolic constants
for use with the
madvise()
function:
- MADV_NORMAL
No further special treatment.
- MADV_RANDOM
Expect random page references.
- MADV_SEQUENTIAL
Expect sequential page references.
- MADV_WILLNEED
Will need these pages.
- MADV_DONTNEED
Will not need these pages.
- MADV_SPACEAVAIL
Ensure that resources are reserved.
The following symbolic constants are defined for use with the
mmap()
and
mprotect()
functions:
- PROT_READ
Region can be read.
- PROT_WRITE
Region can be written.
- PROT_EXEC
Region can be executed.
- PROT_NONE
Region cannot be accessed.
The following symbolic constants are defined for use with the
mmap()
function:
- MAP_FILE
Map a file.
- MAP_ANONYMOUS
Map an unnamed memory region.
- MAP_VARIABLE
Place region at implementation-computed address.
- MAP_FIXED
Place region at specified address.
- MAP_SHARED
Share changes made to mapped region.
- MAP_PRIVATE
Changes to mapped region are private to a process.
The following symbolic constants are defined for use with the
msync()
function:
- MS_SYNC
Perform synchronous writes.
- MS_ASYNC
Perform asynchronous writes.
- MS_INVALIDATE
Invalidate cached pages.
The following symbolic constants are defined for use with the
msem_init(),
msem_lock(),
and
msem_unlock()
functions:
- MSEM_LOCKED
Create semaphore in locked state.
- MSEM_UNLOCKED
Create semaphore in unlocked state.
- MSEM_IF_NOWAIT
Do not wait if semaphore is locked.
- MSEM_IF_WAITERS
Do not unlock if semaphore has no waiters.
The
typedef struct msemaphore
is defined for use with the
msem_init(),
msem_lock(),
msem_unlock(),
and
msem_remove()
functions.
