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bsd_signal (3)
  • >> bsd_signal (3) ( Solaris man: Библиотечные вызовы )
  • bsd_signal (3) ( Linux man: Библиотечные вызовы )
  • bsd_signal (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    bsd_signal - simplified signal facilities
     
    

    SYNOPSIS

    #include <signal.h>
    
    void (*bsd_signal(int sig, void (*func)(int)))(int);
    

     

    DESCRIPTION

    The bsd_signal() function provides a partially compatible interface for programs written to historical system interfaces (see USAGE below).

    The function call bsd_signal(sig, func) has an effect as if implemented as:

    void (*bsd_signal(int sig, void (*func)(int)))(int)
    {
        struct sigaction act, oact;
    
        act.sa_handler = func;
        act.sa_flags = SA_RESTART;
        sigemptyset(&act.sa_mask);
        sigaddset(&act.sa_mask, sig);
        if (sigaction(sig, &act, &oact) == -1)
             return(SIG_ERR);
        return(oact.sa_handler);
    }
    

    The handler function should be declared:

    void handler(int sig);
    

    where sig is the signal number. The behavior is undefined if func is a function that takes more than one argument, or an argument of a different type.  

    RETURN VALUES

    Upon successful completion, bsd_signal() returns the previous action for sig. Otherwise, SIG_ERR is returned and errno is set to indicate the error.  

    ERRORS

    Refer to sigaction(2).  

    USAGE

    This function is a direct replacement for the BSD signal(3UCB) function for simple applications that are installing a single-argument signal handler function. If a BSD signal handler function is being installed that expects more than one argument, the application has to be modified to use sigaction(2). The bsd_signal() function differs from signal(3UCB) in that the SA_RESTART flag is set and the SA_RESETHAND will be clear when bsd_signal() is used. The state of these flags is not specified for signal(3UCB).  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

     

    SEE ALSO

    sigaction(2), sigaddset(3C), sigemptyset(3C), signal(3UCB), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    USAGE
    ATTRIBUTES
    SEE ALSO


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