use popen system call. it will give u the flexibility to read the out put.
# man popen
On 5/10/05, Sandeep <sandeep@xxxxxxxxxxxxxxx> wrote:
>
>
>
>
> ---------- Forwarded message ----------
> From: "Sachin Rane" <sachin.trane@xxxxxxxxx>
> To: "'Sandeep'" <sandeep@xxxxxxxxxxxxxxx>
> Date: Tue, 10 May 2005 11:05:50 -0700
> Subject: RE: How to use a shell command in an application?
> Hi Sandeep,
>
> Could you forward my reply to 'kernelnewbies@xxxxxxxxxxxx' and 'Yasmine
> Habib'?
> This mail may not reach them because of firewall settings.
>
> /****************************************************/
> // Below is the example of executing shell command
> // "cat > /proc/iomem" from application
> //
> /****************************************************/
>
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <stdio.h>
>
> int main(void)
> {
> int fd_exec;
> char *const arg_list[]= {
> "cat",
> "/proc/iomem",
> NULL
> };
> if(fork() == 0)
> {
> /*** Please note below 3 statements can be replaced by the above two
> statements viz close(1) & open(...) ***/
> fd_exec = open("/tmp/iomemdump", O_CREAT | O_WRONLY );
> dup2(fd_exec,1);
> close(fd_exec);
> execvp("/bin/cat",arg_list);
> }
> printf("Hello\n");
> return 0;
> }
>
> Regards,
> Sachin Rane
>
> -----Original Message-----
> From: kernelnewbies-bounce@xxxxxxxxxxxx
> [mailto:kernelnewbies-bounce@xxxxxxxxxxxx]On Behalf Of Sandeep
> Sent: Monday, May 09, 2005 10:07 PM
> To: Yasmine Habib
> Cc: kernelnewbies@xxxxxxxxxxxx
> Subject: Re: How to use a shell command in an application?
>
> Yasmine Habib wrote:
>
> >How can i use a shell command inside a program or application? in
> >other words, i am writing a small scheduler that needs to get the
> >current cpu usage/utliization of a processor at a certain time. using
> >"top", "free", "vmstat" provide me with required information but just
> >as a display when used as a shell command. i need the code to be
> >written inside my scheduler.
> >
> >
> You can try it out with the system( ) call. This will give you the
> flexibility to run any command that u can run in the shell.
>
> sandeep
>
> >Thank you
> >
> >--
> >Kernelnewbies: Help each other learn about the Linux kernel.
> >Archive: http://mail.nl.linux.org/kernelnewbies/
> >FAQ: http://kernelnewbies.org/faq/
> >
> >
> >
> >
>
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-----------
S K T
-----------
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Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
