On Thu, Nov 08, 2001 at 09:54:48AM +0530, kannan ram wrote: > I want to trace the reading file of the user .I redircted the originel > sys_read through another function.In that function I just used one printk > statement to notify the redirction.When the module is inserted ,the message > is diplayed continuosly.What went wrong? is it possible to find the users > reading thru modules apart from strace.Thank u in advance for ur kind help. Kannan, depending upon what sort of read information you want, you may need to hook many more locations. If you are just after the sys_read stuff, well, it *is* called often. You might like to change your code to increment a variable, and print the value of the variable every 1000 times sys_read is called, or something similar, perhaps just to see what sort of differences Note that in a typical kernel compile, get_write_access is called roughly 1.3 million times. sys_read gets called every time a process wants keyboard input, needs to read from a file, a pipe, etc.. so, I would expect sys_read to be called often.. :) (Note that if you want to catch *all* reads, you might as well consider many pieces of files read if the process does a mmap on the file.. :) -- The Bill of Rights: 7 out of 10 rights haven't been sold yet! Contact your congressman for details how *you* can buy one today! -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
