Hello, I had a question regarding making some changes to the execution of system calls. I am relatively new to kernel programming and the working of the kernel and wanted to make sure, that my modifications will not have serious consequences in some other part of the kernel. ( dont want to see smoke from the cpu :) ) I wanted to monitor the execution of system calls, mainly I want to record when system calls fail and make note of those. I need to check the return value in EAX register and if the call returned an error, increment a counter and set some flags and may be write it to a file. I need to store how many calls fail for a particular process. I have coded the part which does the stuff that I need to, but I am not sure where should I make a call to this function. I think this is to be done in entry.S, immediately after the call indexing the sys_call table returns and the return value of the sys call is saved. >From entry.S -> ENTRY(system_call) : : : jne tracesys cmpl $(NR_syscalls), %eax jae badsys call *SYMBOL_NAME(sys_call_table)(,%eax,4) movl %eax,EAX(%esp) # is this where i can make a call to my funct ? ENTRY(ret_from_sys_call) : : : This question is probably meant for the kernel related mailing lists and I apologize for placing it here. Thank you. Ashish. Graduate Student Dept of Computer Science Rochester Institute of Technology -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
