Related files

• loop.c - Small test program
  
• nointerrupt.h - No interrupt system call header
  
• nointerrupt.s - No interrupt system call user land library call
  
• nokill.h - No kill system call header
  
• nokill.s - No kill system call user land library call
  
• arch/ - Linux kernel arch directory with changed files and patches
  
• include/ - Linux kernel include directory with changed files and patches
  
• kernel/ - Linux kernel kernel directory with changed files and patches
  

Descriptions

• nokill
  • sets a flag in the task structure for the process
  • when this flag is set, the only pid that can deliver the SIGKILL signal is pid 1 (init)
  • takes an int as a parameter, the process pid
  • returns an int, 0 is success, anything else is an error
• nointerrupt
  • sets a flag in the task structure for the process
  • when this flag is set, the only pid that can deliver the SIGINT signal is pid 1 (init)
  • takes an int as a parameter, the process pid
  • returns an int, 0 is success, anything else is an error

Caveats

• ctrl-c from the command line
  • usually a ctrl-c at the command line will send the SIGINT signal to the current process
  • for some reason, the signal sending does not take the sys_kill system call path
  • because the sending path is different, calling nointerrupt will not stop a ctrl-c
• constant locking and unlocking of task list and task locks
  • the constant locking and unlocking of these locks could lead to slowed performance