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When using copy-on-write semantics to share memory among processes, how can you test if a memory page is writable or if it is marked as read-only? Can this be done by calling a specific assembler code, or reading a certain spot in memory, or through the OS’s API?
On Linux you can examine /proc/pid/maps:
The first column is the virtual memory address range, the second column contains the permissions (read, write, execute, and private), columns 3-6 contain the offset, major and minor device numbers, the inode, and the name of memory mapped files.