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What's your all time favorite UNIX/Linux book?

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Old 07-16-2012
What's your all time favorite UNIX/Linux book?

I can bet everyone has their one favorite book even though we have had read many books on UNIX or Linux. My all time favorite is "Unix Power Tools". This book always made me geeky and I loved the little tricks/tips in the book. I still do!

The next favorite would be "Prentice Hall Unix and Linux System Administration Handbook".

Even though we get carried away by virtualization, zones, LPAR, nPAR, vPAR, and God knows what more, we still feel a little nostalgic when somebody talks about age old chroot or BSD jails, dont we?

So what's that book of yours that always gives you reason to know more?

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MREMAP(2)						     Linux Programmer's Manual							 MREMAP(2)

mremap - re-map a virtual memory address SYNOPSIS
#include <unistd.h> #include <sys/mman.h> void * mremap(void *old_address, size_t old_size , size_t new_size, unsigned long flags); DESCRIPTION
mremap expands (or shrinks) an existing memory mapping, potentially moving it at the same time (controlled by the flags argument and the available virtual address space). old_address is the old address of the virtual memory block that you want to expand (or shrink). Note that old_address has to be page aligned. old_size is the old size of the virtual memory block. new_size is the requested size of the virtual memory block after the resize. The flags argument is a bitmap of flags. In Linux the memory is divided into pages. A user process has (one or) several linear virtual memory segments. Each virtual memory seg- ment has one or more mappings to real memory pages (in the page table). Each virtual memory segment has its own protection (access rights), which may cause a segmentation violation if the memory is accessed incorrectly (e.g., writing to a read-only segment). Accessing virtual memory outside of the segments will also cause a segmentation violation. mremap uses the Linux page table scheme. mremap changes the mapping between virtual addresses and memory pages. This can be used to implement a very efficient realloc. FLAGS
MREMAP_MAYMOVE indicates if the operation should fail, or change the virtual address if the resize cannot be done at the current virtual address. RETURN VALUE
On success mremap returns a pointer to the new virtual memory area. On error, -1 is returned, and errno is set appropriately. ERRORS
EINVAL An invalid argument was given. Most likely old_address was not page aligned. EFAULT "Segmentation fault." Some address in the range old_address to old_address+old_size is an invalid virtual memory address for this process. You can also get EFAULT even if there exist mappings that cover the whole address space requested, but those mappings are of different types. EAGAIN The memory segment is locked and cannot be re-mapped. ENOMEM The memory area cannot be expanded at the current virtual address, and the MREMAP_MAYMOVE flag is not set in flags. Or, there is not enough (virtual) memory available. NOTES
With current glibc includes, in order to get the definition of MREMAP_MAYMOVE, you need to define _GNU_SOURCE before including <sys/mman.h>. CONFORMING TO
This call is Linux-specific, and should not be used in programs intended to be portable. 4.2BSD had a (never actually implemented) mremap(2) call with completely different semantics. SEE ALSO
getpagesize(2), realloc(3), malloc(3), brk(2), sbrk(2), mmap(2) Your favorite OS text book for more information on paged memory. (Modern Operating Systems by Andrew S. Tannenbaum, Inside Linux by Ran- dolf Bentson, The Design of the UNIX Operating System by Maurice J. Bach.) Linux 1.3.87 1996-04-12 MREMAP(2)

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