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Index > Linux > Malloc: what is SysCall analog for malloc?

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narada



Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk
narada
As i see, fasm uses syscall#45 to get memory, but in my sources #45==Sys_Brk...

Can anybody help me with this...


Description: Syscalls... from my sources... no malloc founded(((
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Filename: syscalls.inc
Filesize: 6.68 KB
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Post 13 Apr 2009, 16:13
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asmcoder



Joined: 02 Jun 2008
Posts: 784
asmcoder
[content deleted]


Last edited by asmcoder on 14 Aug 2009, 14:52; edited 1 time in total
Post 13 Apr 2009, 17:36
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
There is no one actually, if you malloc twice and then dealloc the first malloc you can't SYS_BRK to free without first moving the memory block of the second allocation to the beginning.

You have to implement the memory heap yourself, libc does that way.

Then you have the change of using SYS_MMAP2 which is kinda Windows' VirtualAlloc but extended to support even more (like CreateFileMapping+MapViewOfFile).
Post 13 Apr 2009, 18:26
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
Post 13 Apr 2009, 19:18
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narada



Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk
narada
thanks )
Post 13 Apr 2009, 19:23
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narada



Joined: 15 Feb 2008
Posts: 77
Location: Ukraine, Dnepropetrovsk
narada
P.S. sys_brk is ok, becouse I need only 1 buffer for crypt/decrypt.
Post 13 Apr 2009, 20:13
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