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Standard C Libraries
2.10
<SIGNAL.H> SIGNAL HANDLING
The header file signal.h consists of a type, several macros and two functions that
specify how the program handles signals while it is executing. A signal is a condition
that may be reported during the program execution. Signals are synchronous, occur-
ring under software control via the raise function.
A signal may be handled by:
? Default handling ( SIG_DFL ); the signal is treated as a fatal error and execution
stops
? Ignoring the signal ( SIG_IGN ); the signal is ignored and control is returned to the
user application
? Handling the signal with a function designated via signal .
By default all signals are handled by the default handler, which is identified by SIG_DFL .
The type sig_atomic_t is an integer type that the program access atomically. When
this type is used with the keyword volatile , the signal handler can share the data
objects with the rest of the program.
sig_atomic_t
Description:
Include:
Prototype:
SIG_DFL
Description:
Include:
SIG_ERR
Description:
Include:
SIG_IGN
Description:
Include:
? 2008 Microchip Technology Inc.
A type used by a signal handler
<signal.h>
typedef int sig_atomic_t;
Used as the second argument and/or the return value for signal to
specify that the default handler should be used for a specific signal.
<signal.h>
Used as the return value for signal when it cannot complete a
request due to an error.
<signal.h>
Used as the second argument and/or the return value for signal to
specify that the signal should be ignored.
<signal.h>
DS51456E-page 33
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SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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