madvise - Advise the system of the expected paging behavior of a process
int madvise (
int behav );
Specifies the address of the region to which the advice refers. Specifies the length in bytes of the region specified by the addr parameter. Specifies the behavior of the region. The following values for the behav parameter are defined in the sys/mman.h header file: No further special treatment Expect random page references Expect sequential references Will need these pages Do not need these pages
The system will free any whole pages in the specified region. All modifications will be lost and any swapped out pages will be discarded. Subsequent access to the region will result in a zero-fill-on-demand fault as though it is being accessed for the first time. Reserved swap space is not affected by this call. Ensure that resources are reserved
The madvise() function permits a process to advise the system about its expected future behavior in referencing a mapped file or shared memory region.
Only a few values of the behav parameter values are operational on Tru64 UNIX systems. Non-operational values cause the system to always return success (zero).
Upon successful completion, the madvise() function returns zero. Otherwise, -1 is returned and errno is set to indicate the error.
If the madvise() function fails, errno may be set to one of the following values: The behav parameter is invalid. The behav parameter specifies MADV_SPACEAVAIL and resources cannot be reserved.
Functions: mmap(2) delim off