Linux assembly HOWTO by Boldyshev K.

By Boldyshev K.

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5d 01 Feb 2000 Revised by: konst Resources (former "Pointers") section completely redone, various URL updates. 5c 05 Dec 1999 Revised by: konst New pointers, updates and some rearrangements. Rewrite of sgml source. 5b 19 Sep 1999 Revised by: konst Discussion about libc or not libc continues. New web pointers and and overall updates. 5a 01 Aug 1999 Revised by: konst Quick Start section rearranged, added GAS example. Several new web pointers. 5 01 Aug 1999 Revised by: konstfare GAS has 16−bit mode.

Since each fd that you have open is just an index, and it only needs to be on or off for each fd_set, you need only 1024 bits for an fd_set structure. 1024 / 32 = 32 longs needed to represent the structure. Now, for the loose example. Suppose you want to read from a file descriptor (w/o timeout). − Allocate the equivalent to an fd_set. data my_fds: times 32 dd 0 − open the file descriptor that you want to read from. − set that bit in the fd_set structure. First, you need to figure out which of the 32 dwords the bit is in.

Examine kernel source code (that can be built as module) for details. 18",0 The only thing this example does is reporting its actions. m Chapter 8. Frequently Asked Questions 29 Linux Assembly HOWTO Now you can play with it using insmod/rmmod/lsmod (root privilidged are required); a lot of fun, huh? 6. How do I allocate memory dynamically? text ; ;allocate memory ; %define LIMIT 0x4000000 ; about 100Megs mov call ebx,0 sys_brk ; get bottom of data segment cmp je eax,−1 erro1 ; ok? add mov call eax,LIMIT ebx,eax sys_brk ; allocate +LIMIT memory cmp je eax,−1 erro1 ; ok?

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