Re: libpthread shared library version number

On Thu, 2 Nov 2006, Dan Nelson wrote:

> In the last episode (Nov 02), Wesley Morgan said:
>> I swapped a few e-mails with Maxime Henrion, but the gist of things
>> was that after enabling symbol versioning, I immediately rebuilt
>> everything -- world, ports, kernel. The random crashes I experienced
>> were most apparent with two applications, csup and games/uqm from
>> ports. Xorg would also crash every now and then... An example of what
>> gdb showed me is:
>>
>>     Updating collection ports-all/cvs
>>      Checkout ports/devel/ccrtp/Makefile
>>     Error set: No such file or directory
>>     Updater failed: Cannot create directories leading to
>>     "/usr/ports/devel/ccrtp/Makefile": Unknown error: 0
>>
>>     Breakpoint 1, mkdirhier (path=0x8c40180 "/usr/ports/devel/ccrtp",
>>     mask=18) at misc.c:293
>>     293                             errno = 0;
>>     (gdb) n
>>     294                             if (access(path, F_OK) == 0) {
>>     (gdb)
>>     298                             perror("Error set");
>>     (gdb)
>>     Error set: No such file or directory
>>     299                             if (errno != ENOENT) {
>>     (gdb)
>>     300                                     path[i] = '/';
>>     (gdb) print errno
>>     $1 = 0
>>     (gdb)
>>
>>     It seems that errno is being changed somewhere else?? I'm getting all
>>     kinds of wild results checking errno during execution in gdb.
>>     Sometimes it claims to be 2 or 22, sometimes 0. I'll have to build a
>>     UP kernel and see if that fixes the problem. Trying to use libthr
>>     instead of libpthread dies strangely in thr_getscheduler(). Ugh.
>
> That sort of looks like the perror() call zeroed out errno, which it
> may do, since it calls a bunch of stdio functions.  Try saving errno in
> another variable before calling perror.

I tried several things in misc.c:mkdirhier() at the time, such as 
resetting the value of errno just prior to the call to 
access(), artificially setting it, and I'm somewhat sure I 
tried that saving it at the time, without success. I can't be completely 
sure because I simply switched back to cvsup after a few hours of 
fiddling, before ultimately reverting back to non-versioned libraries.


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