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  • C Standard Library: 9 Signals: <signal.h>

    9 Signals: <signal.h>
    The header <signal.h> provides facilities for handling exceptional conditions that arise during
    execution, such as an interrupt signal from an external source or an error in execution.
    void (*signal(int sig, void (*handler)(int)))(int)
    signal determines how subsequent signals will be handled. If handler is SIG_DFL, the
    implementation-defined default behavior is used, if it is SIG_IGN, the signal is ignored;
    otherwise, the function pointed to by handler will be called, with the argument of the type of
    signal. Valid signals include
    SIGABRT abnormal termination, e.g., from abort
    SIGFPE arithmetic error, e.g., zero divide or overflow
    SIGILL illegal function image, e.g., illegal instruction
    SIGINT interactive attention, e.g., interrupt
    SIGSEGV illegal storage access, e.g., access outside memory limits
    SIGTERM termination request sent to this program
    signal returns the previous value of handler for the specific signal, or SIG_ERR if an error
    occurs.
    When a signal sig subsequently occurs, the signal is restored to its default behavior; then the
    signal-handler function is called, as if by (*handler)(sig). If the handler returns, execution
    will resume where it was when the signal occurred.
    The initial state of signals is implementation-defined.
    int raise(int sig)
    raise sends the signal sig to the program; it returns non-zero if unsuccessful.

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  • 原文地址:https://www.cnblogs.com/freewater/p/2973436.html
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