Messages in this thread | | | From | "sting sting" <> | Subject | do_brk() trace mystery | Date | Fri, 12 Mar 2004 21:39:15 +0200 |
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Hello, for debugging purpoese I had used the strace utilitty. The command I had traced with starce was "cat /proc/interrupts".
Well , I saw that there were not a few calls to the brk() system calls.
What I know is the brk() is a system call that is intended to enlarge procees memory and is supposed to be called by the memory manager when sensing that a process needs more memory.
But I did a search on the kernel tree fo do_brk() and I found only 5 entries (in 2.6 kernel and also in 2.4.24). One of the was the declaration in mm.h; the other was implementation in mmap.c
Now the 2 others were in binfmt_out.c and in binfmt_elf.c
(in 2.4.20 it is also in ksyms.c ; in 2.6 it is not but it is in mm/nommu.c)
So the mystery is : who calls the brk() system call when I type "cat /proc/interrupts"
It does not seem to me that it is binfmt_out.c and in binfmt_elf.c (Or am I wrong)?
(BTW,searching for sys_mmap gives 2 results: \linux-2.4.24\arch\i386\kernel\sys_i386.c and the entry.s file)
regards, Sting
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