Obtaining foreground process group ID of other terminal using system calls
Sreeram B S
sreeramabsc at yahoo.com
Fri Dec 16 04:15:27 UTC 2005
Hi friends,
How can I obtain the foreground process group ID of other terminals using C system calls?
Suppose, that I am working on /dev/tty1. Now, if I want my program to obtain the foreground process group ID of terminal /dev/tty2, then which system call should I use? Also, kindly tell me the usage of that system call.
I tried ioctl() system call, but it failed. The program in which I used ioctl() (but failed) is:
-----------------------------------------------------------------------------
#include <stdio.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
int main() {
int pid;
int fd;
fd = open("/dev/tty1", O_RDONLY);
if ( fd == -1 )
{
perror ("open");
exit (1);
}
if ( ioctl(fd, TIOCGPGRP, &pid) == -1 )
{
perror ("ioctl");
exit (1);
}
printf ("PGRP = %d\n", pid);
exit (0);
}
The error I am getting is this:
ioctl: Inappropriate ioctl for device
------------------------------------------------------------------------------
Kindly suggest me as to how I can achieve the task?
Thanks,
Sreeram
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.busybox.net/pipermail/busybox/attachments/20051215/22c6d36e/attachment-0001.htm
More information about the busybox
mailing list