# Error Handling¶↑

coredump_on_error()
Syntax:
coredump_on_error(1 or 0)
Description:
On unix machines, sets a flag which requests (1) a coredump in case of memory or bus errors.

nrn_feenableexcept()
Syntax:
nrn_feenableexcept(boolean)
Description:
Sets or turns off a flag which, if on, causes a SIGFPE when a floating error occurs which consist of divide by zero, overflow, or invalid result. Known to work on linux. Turning on the flag is very helpful in finding the code location at which a variable is assigned a value of NaN or Inf. For a serial model, this is most easily done when running under gdb. For a parallel model, one can combine with coredump_on_error and, to force a coredump on abort(), use the bash command ‘ulimit -c unlimited’.

show_errmess_always()
Syntax:
show_errmess_always(boolean)
Description:
Sets or turns off a flag which, if on, always prints the error message even if normally turned off by an execute1() statement or other call to the interpreter.

execerror()
Syntax:
execerror("message1", "message2")
Description:
Raise an error and print the messages along with an interpreter stack trace. If there are no arguments, then nothing is printed.