sched_setscheduler() and usage issues ....please help

["Arun Srinivas" <getarunsri@hotmail.com>]

I am trying to set the SCHED_FIFO  policy for my process.I am using 
sched_setscheduler() function to do this.

I am following the correct syntax and running it as root process.I am using 
the given syntax i.e.,
int sched_setscheduler(pid_t pid, int policy, const struct sched_param *p);
(SCHED_FIFO for the policy and priority in the range of 1 to 99 for p).

But the function returns with an value of -1. I am trying to call this 
function from the user-space.

1) Is this usage correct?
2)How do I read the error code (i.e., text description of what kiind of 
error occurred like for eg., ESRCH,EPERM,EINVAL).

Please help.

thanks
Arun

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