C signal representation of S/370 exceptions

S/370 exceptions and abends are mapped to C signals. Therefore, if both of the following condition are true, you can apply C signal handling functions to S/370 exceptions and abends:

You have set the TRAP(ON,SPIE) or the TRAP(ON,NOSPIE) runtime option (Language Environment condition handling is enabled)
You do not request in the assembler user exit or in the ABPERC runtime option that any of the abends be percolated (ABPERC(NONE))

Following are the C signal representations for the following exceptions.

For S/370 exceptions generated by the hardware or math library, see Table 1. Some of the exceptions listed in the table can be masked off for normal Language Environment execution.
For abends, see Table 2.

Table 1. Mapping of S/370 exceptions to C signals
Interrupt code	Interrupt code description	C signal type
01	Operation exception	SIGILL
02	Privileged-operation exception	SIGILL
03	Execution exception	SIGILL
04	Protection exception	SIGSEGV
05	Addressing exception	SIGSEGV
06	Specification exception	SIGILL
07	Data exception	SIGFPE
08	Fixed-point overflow exception	n/a
09	Fixed-point divide exception	SIGFPE
10	Decimal-overflow exception	SIGFPE
11	Decimal-divide exception	SIGFPE
12	Exponent-overflow exception	SIGFPE
13	Exponent-underflow exception	n/a
14	Significance exception	n/a
15	Floating-point divide exception	SIGFPE

Table 2 lists the C signal type for abends that can occur under Language Environment.

Table 2. Mapping of abend signals to C signals
Message	Abend Description	C Signal Type
CEE3250	User-initiated abends (SVC 13)	SIGABND
CEE3250	MVS(VSAM or others)-initiated abends	SIGABND
No message delivered	Language Environment abends for severity 4 errors (U40xx)	n/a
No message delivered	Language Environment-initiated abends	n/a