Signal Handling Function Prototypes
The header file <signal.h> contains a number of function prototypes that are associated with signal handling.
raise()signal()_GetExcData()
The _GetExcData() function is an ILE C/C++ extension
that allows you to obtain information about the exception message
associated with the signal and returns a structure containing information
about the exception message. The _GetExcData() function
returns the same structure that is passed to the #pragma
exception_handler directive.
signal() function
specifies the action that is performed when a signal is raised. There
are ten signals that are represented as macros in the <signal.h>
header file. In addition, the macro SIGALL has the semantics of a
signal but with some unique characteristics. The ten signals are as
follows: - SIGABRT
- Abnormal program end.
- SIGFPE
- Arithmetic operation error, such as dividing by zero.
- SIGILL
- An instruction that is not allowed.
- SIGINT
- System interrupt, such as receiving an interactive attention signal.
- SIGIO
- Record file error condition.
- SIGOTHER
- All other *ESCAPE and *STATUS messages that do not map to any other signals.
- SIGSEGV
- The access to storage is not valid.
- SIGTERM
- A end request is sent to the program.
- SIGUSR1
- Reserved for user-defined signal handler.
- SIGUSR2
- Reserved for user-defined signal handler.
- SIG_IGN
- Ignore the signal.
- SIG_DFL
- Default action for the signal.
SIGALL is an ILE C/C++ extension that allows you to register your
own default-handling function for all signals whose action is SIG_DFL.
This default-handling function can be registered by using the signal() function
with SIGALL, as shown in the example section. A function check is
not a signal and cannot be monitored for by the signal function. SIGALL
cannot be signaled by the raise() function.