> The man page says it all > > !EPERM! > the calling process does not have superuser > permissions > > you cannot unless you have superuser permissions. > Dear Manish, Thanks for the information. I have seen the man pages and find the following. EPERM The caller does not have appropriate privileges to set the specified scheduling policy and parameters. I have tried to set the super user permissions to a normal user through user and groups. However I found there are lot of different groups exists like adm apache avahi bin daemon dbus dip etc. Which groups shall I need to select for setting the super user permissions? Thanks in advance. Thanks and Regards, Srinivas G -- To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html