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These system calls give you access to virtual memory facilities.
Memory management functions
| getpagesize | get system page size | 
| memcntl | memory management control | 
| mmap | map pages of memory | 
| mprotect | set protection of memory mapping | 
| munmap | unmap pages of memory | 
| plock | lock process, text, or data in memory | 
| brk sbrk | dynamically allocate memory space |