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Date: Fri, 21 Mar 2014 14:02:04 -0400
From: Rich Felker <dalias@...ifal.cx>
To: John Mudd <johnbmudd@...il.com>
Cc: musl <musl@...ts.openwall.com>
Subject: Re: Build on linux 2.6 and run on linux 2.4?
On Fri, Mar 21, 2014 at 01:54:34PM -0400, John Mudd wrote:
> Here is the regular and strace output on 2.4 kernel, more specifically
> Linux 2.4.21-4.EL #1 Fri Oct 3 18:13:58 EDT 2003 i686 i686 i386 GNU/Linux.
>
> $ test_threads2
> Counter value functionCount1: 1
> Counter value functionCount1: 2
> Counter value functionCount1: 3
> Counter value functionCount2: 4
> Counter value functionCount2: 5
> Counter value functionCount2: 6
> Counter value functionCount2: 7
> Counter value functionCount1: 8
> Counter value functionCount1: 9
> Counter value functionCount1: 10
> Final count: 10
> $
>
> $ strace test_threads2
> execve("/home/jmudd/test_threads2", ["test_threads2"], [/* 26 vars */]) = 0
> rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
> set_thread_area({entry_number:-1 -> 6, base_addr:0x804e540, limit:1048575,
> seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
> seg_not_present:0, useable:1}) = 0
> set_tid_address(0x804e558) = 25884
> mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb75ea000
> mprotect(0xb75eb000, 86016, PROT_READ|PROT_WRITE) = 0
> clone(child_stack=0xb75fff30,
> flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED,
> parent_tidptr=0xb75fff58, {entry_number:6, base_addr:0xb75fff40,
> limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
> seg_not_present:0, useable:1}, child_tidptr=0xb75fff58) = 25885
> mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb75d4000
> mprotect(0xb75d5000, 86016, PROT_READ|PROT_WRITE) = 0
> clone(child_stack=0xb75e9f30,
> flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED,
> parent_tidptr=0xb75e9f58, {entry_number:6, base_addr:0xb75e9f40,
> limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
> seg_not_present:0, useable:1}, child_tidptr=0xb75e9f58) = 25886
> futex(0xb75fff58, FUTEX_WAIT, 25885, NULLCounter value functionCount1: 1
> Counter value functionCount1: 2
> Counter value functionCount1: 3
> Counter value functionCount2: 4
> Counter value functionCount2: 5
> Counter value functionCount2: 6
> Counter value functionCount2: 7
> Counter value functionCount1: 8
> Counter value functionCount1: 9
> Counter value functionCount1: 10
> ) = 0
> munmap(0xb75ea000, 90112) = 0
> munmap(0xb75d4000, 90112) = 0
> writev(1, [{"Final count: 10", 15}, {"\n", 1}], 2Final count: 10
> ) = 16
> exit_group(0) = ?
> $
Is this a stock 2.4.x kernel or a distro-modified one that might have
things backported from 2.6?
Can you re-run the strace with:
strace -f -o logfile test_threads2
-f is needed to trace anything but the main thread/original process,
and -o to a file produces nicer output (pid/tid on each line) than the
usual default.
Rich
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