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Message-ID: <CAGDMk9E=qDgt2C0JpxnoNxDUU+cBaD=K99KPTWDbXfKzBLXMbQ@mail.gmail.com>
Date: Fri, 21 Mar 2014 15:48:31 -0400
From: John Mudd <johnbmudd@...il.com>
To: Rich Felker <dalias@...ifal.cx>
Cc: musl <musl@...ts.openwall.com>
Subject: Re: Build on linux 2.6 and run on linux 2.4?
$ getconf GNU_LIBPTHREAD_VERSION
NPTL 0.60
$
So that's it, I lucked out? I can start building my apps on a modern Linux
and still run on my older ones? If so then this is like being told time
travel is possible.
On Fri, Mar 21, 2014 at 2:24 PM, John Mudd <johnbmudd@...il.com> wrote:
> $ cat /etc/*-release
> LSB_VERSION="1.3"
> Red Hat Enterprise Linux AS release 3 (Taroon)
> [jmudd@...s jmudd]$ lsb_release -a
> LSB Version: 1.3
> Distributor ID: RedHatEnterpriseAS
> Description: Red Hat Enterprise Linux AS release 3 (Taroon)
> Release: 3
> Codename: Taroon
> $ uname -mrs
> Linux 2.4.21-4.EL i686
> $ cat /proc/version
> Linux version 2.4.21-4.EL (bhcompile@...fy.perf.redhat.com) (gcc version
> 3.2.3 20030502 (Red Hat Linux 3.2.3-20)) #1 Fri Oct 3 18:13:58 EDT 2003
> $
>
>
> logfile:
> 25920 execve("/home/jmudd/test_threads2", ["test_threads2"], [/* 26 vars
> */]) = 0
> 25920 rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0
> 25920 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
> 25920 set_tid_address(0x804e558) = 25920
> 25920 mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb75ea000
> 25920 mprotect(0xb75eb000, 86016, PROT_READ|PROT_WRITE) = 0
> 25920 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) = 25921
> 25920 mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0xb75d4000
> 25920 mprotect(0xb75d5000, 86016, PROT_READ|PROT_WRITE) = 0
> 25920 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) = 25922
> 25920 futex(0xb75fff58, FUTEX_WAIT, 25921, NULL <unfinished ...>
> 25922 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25922 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25920 <... futex resumed> ) = -1 EINTR (Interrupted system
> call)
> 25922 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25920 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25920 futex(0xb75fff58, FUTEX_WAIT, 25921, NULL <unfinished ...>
> 25921 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25921 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25920 <... futex resumed> ) = -1 EINTR (Interrupted system
> call)
> 25921 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25920 --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25920 futex(0xb75fff58, FUTEX_WAIT, 25921, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0e8, FUTEX_WAIT, 0, NULL <unfinished ...>
> 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
> 25921 writev(1, [{"Counter value functionCount1: 1", 31}, {"\n", 1}], 2) =
> 32
> 25921 futex(0x804e0e8, FUTEX_WAIT, 1, NULL <unfinished ...>
> 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 writev(1, [{"Counter value functionCount1: 2", 31}, {"\n", 1}], 2) =
> 32
> 25921 futex(0x804e0e8, FUTEX_WAIT, 2, NULL <unfinished ...>
> 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 writev(1, [{"Counter value functionCount1: 3", 31}, {"\n", 1}], 2) =
> 32
> 25921 futex(0x804e0e8, FUTEX_WAIT, 3, NULL <unfinished ...>
> 25922 writev(1, [{"Counter value functionCount2: 4", 31}, {"\n", 1}], 2) =
> 32
> 25922 writev(1, [{"Counter value functionCount2: 5", 31}, {"\n", 1}], 2) =
> 32
> 25922 writev(1, [{"Counter value functionCount2: 6", 31}, {"\n", 1}], 2) =
> 32
> 25922 writev(1, [{"Counter value functionCount2: 7", 31}, {"\n", 1}], 2) =
> 32
> 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 writev(1, [{"Counter value functionCount1: 8", 31}, {"\n", 1}], 2) =
> 32
> 25921 futex(0x804e0e8, FUTEX_WAIT, 4, NULL <unfinished ...>
> 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 writev(1, [{"Counter value functionCount1: 9", 31}, {"\n", 1}], 2) =
> 32
> 25921 futex(0x804e0e8, FUTEX_WAIT, 5, NULL <unfinished ...>
> 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL <unfinished ...>
> 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1
> 25921 <... futex resumed> ) = 0
> 25921 writev(1, [{"Counter value functionCount1: 10", 32}, {"\n", 1}], 2)
> = 33
> 25921 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
> 25921 _exit(0) = ?
> 25920 <... futex resumed> ) = 0
> 25920 munmap(0xb75ea000, 90112) = 0
> 25920 futex(0xb75e9f58, FUTEX_WAIT, 25922, NULL <unfinished ...>
> 25922 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0
> 25922 _exit(0) = ?
> 25920 <... futex resumed> ) = 0
> 25920 munmap(0xb75d4000, 90112) = 0
> 25920 writev(1, [{"Final count: 10", 15}, {"\n", 1}], 2) = 16
> 25920 exit_group(0) = ?
>
>
>
> On Fri, Mar 21, 2014 at 2:02 PM, Rich Felker <dalias@...ifal.cx> wrote:
>
>> 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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