fprintf crases
Hi All,
I am getting this issue ,
when I am running my test.so under the following OS configuration,uname -a output as the below
SunOS hello_test 5.9 Generic_118558-35 sun4u sparc SUNW,Sun-Blade-100,
I get Crash occurred in function fprintf from module /usr/lib/libc.so.1.
But the same shared object if I run in a machine with following configuration I
SunOS bdcnetra03 5.9 Generic_117171-17 sun4u sparc SUNW,UltraSPARC-IIi-cEngine don't get any issue.
Any suggestions or help would be appreciated. Is there any issue accros OS version as they mismatch (one Generic_118558-35 and other as Generic_117171-17 ) although their release is same (5.9).
Thanks and regards
-A
[733 byte] By [
ujara] at [2007-11-27 6:37:30]
# 1
Hello.
a) Are you sure all arguments are correct?
b) Are you sure the FILE* argument is correct and the file is OK?
c) How long is the string you want to print (number of characters written to the file)?
d) If you use "%s" are you sure all the strings are NUL-terminated?
Martin
# 3
> Hi,
> I am wondering if those were the issue then it should
> be consistent across all OS versions isn't it?
Hello
Your problem is not the OS kernel it is one of the libraries - I think it is a different version of libc.so.1 - or it is a difference on the two machines having nothing to do with the OS version.
The first problem could be very simple: On one machine fopen() succeeds while on the other machine fopen() fails. So the FILE* argument is NULL in one case.
Another problem can be caused by other operations that are not correct:
f=fopen(filename,"w");
strcpy(uninitialized_pointer_variable,"xyz");
fprintf(f,"Hello.\n");
The actual value of "uninitialized_pointer_variable" depends on many factors. It may be "&f" and so the contents of f is destroyed.
Functions with a variable number of arguments often depend on the previous command if the arguments are wrong:
f=fopen(filename,"w");
anyFunction();
fprintf(f,"%s\n" /* a string is missing here */);
Now it is depending on the actual implementation of "anyFunction" (If the "fprintf" directly follows the "fopen" anyFunction=fopen) - this means on the version of libc.so.1 - if the program is running or not.
Martin
# 4
Hi,
Thanks for the reply and update.
Can you tell me as how do I find the version of libc.so.1 on a particular machine?
And what other differences should I look in among the different machines to figure out the issue.Also suggest me some workaround.
Looking forward for your response.
Thanks
-A
ujara at 2007-7-12 18:05:56 >
