On Wed, 21 Mar 2007, Dan Price wrote:
On Wed 21 Mar 2007 at 10:24PM, allen mathias wrote:
Apologies for not posting this earlier. This is the source code.
int main()
{
string line;
ofstream fsmo;
fsmo.open("temp.temp.ae");
ifstream fsm;
fsm.open("temp.ae");
getline(fsm, line);
while(line!="eof")
{
fsmo << line<< endl;
getline(fsm, line);
}
return 0;
}
If you run your two variants under truss -c, you may see that under CC
this seems to generate an excess of lseek's. I'm not sure why:
This is the problem with the default C++ library, I believe.
Alexander
Here's an example from /usr/dict/words (I stuck "eof" at the end of it):
CC:
lseek .571 150890
write(6, " a d m o n i t i o n\n", 11) = 11
lseek(6, 0, SEEK_CUR) = 2763
lseek(6, 0, SEEK_CUR) = 2763
lseek(6, 0, SEEK_CUR) = 2763
lseek(6, 0, SEEK_CUR) = 2763
lseek(6, 0, SEEK_END) = 2763
lseek(6, 2763, SEEK_SET) = 2763
g++:
lseek .000 1
write(6, " a d m o n i s h\n", 9) = 9
write(6, " a d m o n i t i o n\n", 11) = 11
write(6, " a d o\n", 4) = 4
That's not good, although I don't know why that might be happening.
Could you confirm whether you are indeed seeing this happen?
-dp
--
Daniel Price - Solaris Kernel Engineering - [EMAIL PROTECTED] - blogs.sun.com/dp
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