redirecting stdout/stderr on execl

[shea martin]

consider the following code:

ofstream logFile("out.txt");
streambuf *outbuf = cout.rdbuf(logFile.rdbuf());
streambuf *errbuf = err.rdbuf(logFile.rdbuf());

cout << "this goes to log file\n";

//out put from following command is NOT put in logFile
execlp("echo", "echo", "hello there", (char*)0);

How can I make the output of the command I exec be directed to that file
too.

Thanks,

~Shea M.

[shea martin]

I figured it out:


#define STDOUT 1
#define STDERR 2

dup2(logFile.rdbuf()->fd(),STDOUT);
dup2(logFile.rdbuf()->fd(),STDERR);

shea martin wrote:

> consider the following code:
>
> ofstream logFile("out.txt");
> streambuf *outbuf = cout.rdbuf(logFile.rdbuf());
> streambuf *errbuf = err.rdbuf(logFile.rdbuf());
>
> cout << "this goes to log file\n";
>
> //out put from following command is NOT put in logFile
> execlp("echo", "echo", "hello there", (char*)0);
>
> How can I make the output of the command I exec be directed to that file
> too.
>
> Thanks,
>
> ~Shea M.
>

[Barry Margolin]

In article <3F1C57FD.7080004@telus.net>,
shea martin <samworks@telus.net> wrote:

>I figured it out:
>
>
>#define STDOUT 1
>#define STDERR 2

You should probabably make use of the standard macros STDOUT_FILENO and
STDERR_FILENO from <unistd.h>.

>dup2(logFile.rdbuf()->fd(),STDOUT);
>dup2(logFile.rdbuf()->fd(),STDERR);

--
Barry Margolin, [email]barry.margolin@level3.com[/email]
Level(3), Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.

[shea martin]

I fugured that there must be such thing, but didn't see it. Thanks.

Barry Margolin wrote:

> In article <3F1C57FD.7080004@telus.net>,
> shea martin <samworks@telus.net> wrote:
>

>>I figured it out:
>>
>>
>>#define STDOUT 1
>>#define STDERR 2

>
>
> You should probabably make use of the standard macros STDOUT_FILENO and
> STDERR_FILENO from <unistd.h>.
>
>

>>dup2(logFile.rdbuf()->fd(),STDOUT);
>>dup2(logFile.rdbuf()->fd(),STDERR);

>
>