Signal handling (`signal.h`)¶

Include signal.h for signal constants and abnormal program termination.

Types and Macros¶

Name	Meaning
`SIGABRT`	Abnormal termination signal (abort).
`SIGFPE`	Erroneous arithmetic operation.
`SIGILL`	Illegal instruction.
`SIGINT`	Interactive attention signal.
`SIGSEGV`	Invalid memory access.
`SIGTERM`	Termination request.
`_sig_fn_t`	Signal handler function type.
`SIG_DFL`	Default signal action: terminate the program.
`SIG_IGN`	Ignore the signal.
`SIG_ERR`	Returned by signal() on error.

The signal numbers and handler constants provide C89 source compatibility. CP/M does not install or deliver asynchronous signal handlers.

Function	Summary
`int raise(int sig)`	Send signal sig to the running program. SIGABRT calls abort(); all other signals are no-ops on CP/M 2.2.
`void (signal(int sig, void (func)(int)))(int)`	Install func as the handler for signal sig; returns the previous handler or SIG_ERR. On CP/M 2.2 there is no async signal delivery, so SIG_ERR is always returned.

signal() always returns SIG_ERR; neither SIG_DFL, SIG_IGN, nor a user-provided handler can be installed on CP/M 2.2.

raise(SIGABRT) calls abort() and does not return. Raising any other defined signal is a no-op that returns zero.