Permission Denied Error

[tewari68]

Hi,

I get the permission denied error while writing to a file, the code is

string fName = "/var/tmp/" + m_messageID + ".log";
ofstream dbfile1 (fName.c_str(), ios::app);
system("uname -n >> dbfile1");

the file fName already exists and contains some text.

Appreciate any help.

Thanks,
Tewari

 

[cpjust]

What are the permissions on that file?
Are you the owner of the file?

 

[Salem]

> system("uname -n >> dbfile1");
This isn't the file you're writing to.

string cmd = "uname -n >> " + fName;
system( cmd.c_str() );

But you already have the file open with
ofstream dbfile1 (fName.c_str(), ios::app);
Which I think you should just delete from the code.

--

 

[tewari68]

Hi Salem,
Your code works.
However I have one more problem in this case I am calling exim with -v option and want to redirect the output generated to the file.

string mailerSwitch1;
   string mailerSwitch2;
   string mSwitch;
   string switchOptn;
   string lessSign;
   string space;
   string systemCall;
   string Ch;
   const char * systemCallExec;

mailerSwitch1 = " -f ";
   mailerSwitch2 = " -v ";
   mSwitch = " -oMr";
   switchOptn = " processed";
   space = " ";
   lessSign = " < ";

systemCall = m_mailer + mailerSwitch2 + mailerSwitch1 + Ch + space + m_envelopTo + lessSign + finalEmailDestination;

string fname = "/var/tmp/" + m_msgid + ".log";
ofstream dbfile (fname.c_str(), ios::app);
               string cmd;
               cmd = systemCall + " >> " + fname;
               
               system(cmd.c_str());

Here the output still goes to the std out and not redirected to the file.
Can you suggest the changes.

THanks,
Tewari

 

[Salem]

> cmd = systemCall + " >> " + fname;
Print this out, to see what you have.

Then paste it into a console window - does it still not redirect properly, or does it do what you want?



--

 

[tewari68]

Hi,
Ya I pasted it on the console window still the output goes to the stdout and not the file.

The call is to exim with -v -f option.

The systemCall looks like 
/var/exim -v -f abc@yahoo.com < /var/tmp/filename >> filename.log

 

[Salem]

Perhaps it's writing to stderr, rather than stdout.

If it is just stderr, then you can redirect this as well

/var/exim -v -f abc@yahoo.com < /var/tmp/filename >> filename.log 2>&1

Or if it's particularly poorly written, perhaps its writing directly to the terminal.

Does it look like normal text output (like you get from say 'ls'), or does it look like its using some kind of terminal control to give the impression of some kind of "windows" in a terminal environment (say split panes, input lines, menus etc).

--

 

[tewari68]

Hi Salem,
Ya I overlooked that exim was writing to stderr not stdout with -v option.
Now it works fine.

Thanks for the help.