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Supported Signals

The signals supported by Release 6.00 can be divided into three groups: signals managed only by SAS/C, signals managed exclusively by USS, and signals with dual support. For dual-support signals, you can define during program startup which signals are to be handled by USS and which are to be handled by the SAS/C library.

Signals managed exclusively by SAS/C are

SIGASY1-8	application-defined asynchronous signals
SIGFPDIV	floating-point division by 0
SIGFPOFL	floating-point overflow
SIGFPUFL	floating-point underflow
SIGIDIV	integer division by 0
SIGIUCV	VM inter-user communication signal
SIGMEM	no memory available for stack space
SIGUSR3-8	application-defined synchronous signals.

Signals managed exclusively by USS are

SIGCHLD	child process stopped
SIGCONT	continue process if stopped
SIGHUP	controlling terminal hangup
SIGKILL	process terminated (cannot be blocked)
SIGPIPE	write to a pipe that is not open for reading
SIGQUIT	interactively terminate process
SIGSTOP	process stopped (cannot be blocked)
SIGTRAP	debugging signal
SIGTSTP	interactively stop process
SIGTTIN	background process read from controlling terminal
SIGTTOU	background process write to controlling terminal.

Signals managed either by SAS/C or USS are

SIGABND	system ABEND
SIGABRT	abort function called
SIGALRM	real-time expiration signal
SIGFPE	general computational error
SIGILL	illegal instruction executed
SIGINT	interactive terminal attention signal
SIGIO	undefined
SIGSEGV	illegal memory access
SIGTERM	termination request
SIGUSR1-2	application-defined synchronous signals.

Each signal that may be managed by SAS/C is described in detail later in this section. See the POSIX.1 standard or The POSIX.1 Standard: A Programmer's Guide (Zlotnick 1991), for information on the signals defined by POSIX and managed by USS. All signals that can be used with the library have assigned numbers in the header file <signal.h> . Always refer to signals by their names, not their numbers, because signal numbers are not portable.

Note:    The library permits you to raise the signals SIGIO and SIGTERM , but at the present it does not assign a meaning to these signals.  

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