On Tue, May 10, 2005 at 11:12:40 +0530, Sandeep wrote:
> /****************************************************/
> // Below is the example of executing shell command
> // "cat > /proc/iomem" from application
> //
> /****************************************************/
1) Are you sure you want to invoke "cat > /proc/iomem" and not simply
open /proc/iomem for writing ?!?!
2) Are you sure you want to *write* to /proc/iomem? I'd bet you really
want to read from it -- now that's "cat /proc/iomem" from shell (and
just opening it for read in C code).
> #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;
> }
Hm. You are really invoking "cat /proc/iomem > /tmp/iomemdump". Could
you pleas explain the point in doing so? You want to simply read
/proc/iomem, no?
-------------------------------------------------------------------------------
Jan 'Bulb' Hudec <bulb@xxxxxx>
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