I am a big fan of Java’s MappedByteBuffers for situations like this. It is blazing fast. Below is a snippet I put together for you that maps a buffer to the file, seeks to the middle, and then searches backwards to a newline character. This should be enough to get you going? I have similar … Read more
The correct terms are memory mapped files and anonymous mappings. When referring to memory mapping, one is usually referring to mmap(2). There are 2 categories for using mmap. One category is SHARED vs PRIVATE mappings. The other category is FILE vs ANONYMOUS mappings. Mixed together you get the 4 following combinations: PRIVATE FILE MAPPING SHARED … Read more
busybox devmem busybox devmem is a tiny CLI utility that mmaps /dev/mem. You can get it in Ubuntu with: sudo apt-get install busybox Usage: read 4 bytes from the physical address 0x12345678: sudo busybox devmem 0x12345678 Write 0x9abcdef0 to that address: sudo busybox devmem 0x12345678 w 0x9abcdef0 Source: https://github.com/mirror/busybox/blob/1_27_2/miscutils/devmem.c#L85 mmap MAP_SHARED When mmapping /dev/mem, you … Read more