Re: [fpc-devel]Re: Bug in AssignPipe() on Linux
This is the culprit. On my system (SuSE 7.1) I have /etc/localtime: symbolic link to /usr/share/zoneinfo/CST6CDT - but I can't find a file named timezone anywhere. It is a FPC/FCL/LCL/Lazarus bug, but mostly fpc. I've to talk to Peter first before fixing this. ___ fpc-devel maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel]Re: Bug in AssignPipe() on Linux
It is a FPC/FCL/LCL/Lazarus bug, but mostly fpc.
I don't use Lazarus - ironically, I ran into this bug while
trying to recompile a program that interfaces FPC with NEdit.
It doesn't use Lazarus or GTK, but it uses popen(F, 'ppc386 -iV', 'R')
to check the compiler version. As a temporary workaround, I can use
oldlinux.popen() or shell('ppc386 -iV version.txt') and read the
result from there.
Thanks a bunch for your help - I would never have guessed
the timezone file had anything to do with opening a pipe!
The real, more fundamental problem a convention change about
errorhandling.
A side effect is that uncatched errors internally in the RTL can propagate
to the next call.
The actual (convention) problem was that assignpipe read errno when the
call hadn't failed. This was no problem in the old convention
(errno/linuxerror reset to zero on succesfull call) but is in the new one.
PS: For some reason my posts never get nested in the right
thread - Maybe pipermail doesn't like yahoo's headers ?
Maybe the yahoo client or server mutilates some headers. I don't use
threading in email atm, so I wouldn't know.
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[fpc-devel]Re: Bug in AssignPipe() on Linux
Did you try the example I posted?
Yes, and it runs fine.
Peter
hmmm...
I have tried everything you suggested ( and everything else I can think of )
but I still can't get it to work.
Could someone else please try this with the Linux 1.9.0 compiler,
and let me know the results ?
program pipetest;
uses errors, unix;
var
pipi, pipo: text;
begin
AssignPipe(pipi, pipo);
perror('AssignPipe', LinuxError);
end.
Thanks,
- Jeff
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Re: [fpc-devel]Re: Bug in AssignPipe() on Linux
Jeff Pohlmeyer:
I do not try your sample(I remove it and install 1.0.10),
but the lazarus IDE on my pc always show the same error(can not create pipe)
with FPC 1.9.0 Compiler!
Did you try the example I posted?
Yes, and it runs fine.
Peter
hmmm...
I have tried everything you suggested ( and everything else I can think of )
but I still can't get it to work.
Could someone else please try this with the Linux 1.9.0 compiler,
and let me know the results ?
program pipetest;
uses errors, unix;
var
pipi, pipo: text;
begin
AssignPipe(pipi, pipo);
perror('AssignPipe', LinuxError);
end.
Thanks,
- Jeff
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= = = = = = = = = = = = = = = = = = = =
GongYu
[EMAIL PROTECTED]
2003-11-09
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Re: [fpc-devel]Re: Bug in AssignPipe() on Linux
GongYu wrote: Jeff Pohlmeyer: I do not try your sample(I remove it and install 1.0.10), but the lazarus IDE on my pc always show the same error(can not create pipe) with FPC 1.9.0 Compiler! This won't help us to improve FPC... ___ fpc-devel maillist - [EMAIL PROTECTED] http://lists.freepascal.org/mailman/listinfo/fpc-devel
Re: [fpc-devel]Re: Bug in AssignPipe() on Linux
pipi, pipo: text;
begin
AssignPipe(pipi, pipo);
perror('AssignPipe', LinuxError);
end.
I've tried it, with fpc 1.9.0 (binary rpm downloaded from sf).
$ fpc pipetest.pp
Hint: End of reading config file /etc/fpc.cfg
Free Pascal Compiler version 1.9.0 [2003/11/05] for i386
Copyright (c) 1993-2002 by Florian Klaempfl
Target OS: Linux for i386
Compiling pipetest.pp
Linking pipetest
9 Lines compiled, 0.7 sec
$ ./pipetest
AssignPipe: Success
- Do an strace, and see if there is a function that fails.
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Re: [fpc-devel]Re: Bug in AssignPipe() on Linux
[ Charset ISO-8859-1 unsupported, converting... ]
Marco van de Voort wrote:
- Do an strace, and see if there is a function that fails.
Everything seems OK.
$ strace pipetest
execve(/home/plc/Pascal/test1.9/pipetest, [pipetest], [/* 63 vars */]) = 0
sigaction(SIGFPE, {0x805a9d4, [], 0}, {SIG_DFL}, 0x40054d58) = 0
sigaction(SIGSEGV, {0x805a9d4, [], 0}, {SIG_DFL}, 0x40054d58) = 0
sigaction(SIGBUS, {0x805a9d4, [], 0}, {SIG_DFL}, 0x40054d58) = 0
sigaction(SIGILL, {0x805a9d4, [], 0}, {SIG_DFL}, 0x40054d58) = 0
getpid()= 4307
readlink(/proc/4307/exe, /home/plc/Pascal/test1.9/pipetest, 255) = 33
open(/etc/timezone, O_RDONLY) = 3
This is the culprit. People that have this file don't have the problem.
If this one goes wrong, the errno value remains there, and the next
decision that bases itself on linuxerror goes wrong.
This is why it was hard to reproduce:
In my case, this happens
getpid()= 3953
readlink(/proc/3953/exe, /export/home/marcov/pipetest, 255) = 28
open(/etc/timezone, O_RDONLY) = -1 ENOENT (No such file or directory)
- failed
stat(/etc/localtime, {st_mode=S_IFREG|0644, st_size=1074, ...}) = 0
open(/etc/localtime, O_RDONLY)= 3
- found, but errno is untouched.
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