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signal cppreference.com
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signal

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C
 
 
<tbody> </tbody>
<signal.h>
void (*signal( int sig, void (*handler) (int))) (int);
sig. , , , .
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Sets the error handler for signal sig. The signal handler can be set so that default handling will occur, signal is ignored, or an user-defined function is called.
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, signal(sig, SIG_DFL) . , AF .
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When signal handler is set to a function and a signal occurs, it is implementation defined whether signal(sig, SIG_DFL) will be executed immediately before the start of signal handler. Also, the implementation can prevent some implementation-defined set af signals from occurring while the signal handler runs.
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SIGFPE, SIGILL SIGSEGV, . .
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If the user defined function returns when handling SIGFPE, SIGILL or SIGSEGV, the behavior is undefined. In most implementations the program terminates.
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abort raise, ,
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If the signal handler is called as a result of abort or raise, the behavior is undefined if any of the following requirements is not followed:
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  • raise.
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    the signal handler calls raise.
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  • volatile sig_atomic_t.
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    the signal handler refers to an object of static storage duration which is not declared as volatile sig_atomic_t.
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  • , abort, _Exit, signal , .
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    the signal handler calls any function within the standard library, except abort, _Exit, or signal with the first argument not being the number of the signal currently handled.
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sig
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the signal to set the signal handler to. It can be an implementation-defined value or one of the following values:

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handler
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void fun(int sig);
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the signal handler. This must be one of the following:
  • SIG_DFL macro. The signal handler is set to default signal handler.
  • SIG_IGN macro. The signal is ignored.
  • pointer to a function. The signature of the function must be equivalent to the following:
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void fun(int sig);
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SIG_ERR ( ).
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Previous signal handler on success or SIG_ERR on failure (setting a signal handler can be disabled on some implementations).
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C++ signal
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