testsuite/systemtap.samples/system_func.stp


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#! stap

# test the system() function

global saw_echo, did_cat

probe kernel.function("sys_open") {
  if (!saw_echo) {
    # very inefficient. Testing only. DO NOT DO THIS
    msg="echo sys_open"
    system(msg)
    saw_echo = 1
  }
}

probe timer.ms(100) {
  # should fail	
  system("cat __xyzzy123ABC__")
  did_cat = 1
}

probe timer.ms(150) { 
	if (saw_echo && did_cat)
		exit() 
}

probe begin {
  # should succeed
  system("whoami")
}

probe end {
  # should succeed
  system("echo DONE")
}