" getline(cin,stream) " gives segmentation fault error

Question

Hi
In our application, we have a client and a server. Client and server communicate from network with inetd services. server listens the port with fd_set and get the the string with " select " as a command line argument. everything looks fine in communication but when the client sent a string over the network and server tries the read with getline(cin,stream ), application throws a segmentation fault error.
Code:
struct timeval t;
t.tv_sec=60;
t.tv_usec=0;
fd_set rset;
FD_ZERO(&rset);
FD_SET(STDIN_FILENO, &rset);
if(select(2, &rset,NULL,NULL,&t) == 0)
return NULL;
getline(cin, stream); *//application crashes here*
How can we solve this error ?
thanks for your kindly answers.
regards
aykut

Answer 1

Aykut wrote:
Thanks for your addressing Andrew. i have already tried it. nothing have changed. well, i have read SunStudio11_Cpp_UserGuide and applied what it says. i think, my error is not related with standart compiler. this caused by 3rdparty tools. i am working on them right now.It's quite possible that your 3rd party tools are causing your problem, but given the dependencies between the C++ run-time libraries and the thread library, the link statement you provided earlier still has problems:
/sunpro/11/bin/CC -xildoff /dev_obj/users/src/project/sample.o -L/dev_obj/users/src/lib -lcommonCode -L/3rdparty/sybase/ebf10536/lib -lblk_r -lct_r -lcs_r -lcomn_r -ltcl_r -lintl_r -L/usr/lib -lCstd -lnsl -ldl -lthread -lposix4 -lintl -lresolv -lsocket -lc -lcrypt -L/usr/perl5/5.00503/sun4-solaris/CORE -lperl /usr/perl5/5.00503/sun4-solaris/auto/DynaLoader/DynaLoader.a -L/3rdparty/roguewave/SUNPRO60/12s/lib -lctl12s8 -ldbt12s8 -ltls12s8 -L/3rdparty/roguewave/SUNPRO60/12s/lib -lstd12s8 -o /dev_obj/users/src/project/sampleYou should remove "-L/usr/lib -lCstd" from your link step, and probably "-lc" also.
Also, your compile steps include the "-staticlib=libC" option, but your link step does not. That may or may not cause problems. You can try adding it to your link step, but try that after removing the extra library options, because that option probably does nothing when supplied to a compile-only step.
Finally, what patch level are patches 108434 and 108434 at? The latest versions of those patches are 108434-24 and 108435-24:
http://developers.sun.com/sunstudio/downloads/patches/ss11_patches.html
In my experience, the patch levels have a huge impact on C++ run-time issues. Note that there are dramatic dependencies on the levels of those patches. Do not compile on a machine at 108434-24 and try running on a machine at 108434-14, for example. All your machines pretty much must be at the same patch level for these series of patches.
If none of that works, and you can't isolate the problem to your third-party tools, you can try using the newer thread library, located in /usr/lib/lwp and /usr/lib/lwp/64, IIRC (I don't have access to a Solaris 8 box right now to check). You can add "-R/usr/lib/lwp" to your link statement and pick up the newer thread model.
You should also explore upgrading Solaris. Solaris 8 is pretty much no longer supported and as you're finding out, there are some rather intricate dependencies under Solaris 8 that Sun really did a good job removing in Solaris 9 and especially Solaris 10.