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sysv_signal (3)
  • >> sysv_signal (3) ( Linux man: Библиотечные вызовы )
  •  

    NAME

    sysv_signal - signal handling with System V semantics
     
    

    SYNOPSIS

    #define _GNU_SOURCE
    #include <signal.h>

    typedef void (*sighandler_t)(int);

    sighandler_t sysv_signal(int signum, sighandler_t handler);  

    DESCRIPTION

    The sysv_signal() function takes the same arguments, and performs the same task, as signal(2).

    However sysv_signal() provides the System V unreliable signal semantics, that is: a) the disposition of the signal is reset to the default when the handler is invoked; b) delivery of further instances of the signal is not blocked while the signal handler is executing; and c) if the handler interrupts (certain) blocking system calls, then the system call is not automatically restarted.  

    RETURN VALUE

    The sysv_signal() function returns the previous value of the signal handler, or SIG_ERR on error.  

    ERRORS

    As for signal(2).  

    CONFORMING TO

    This function is non-standard.  

    NOTES

    Use of sysv_signal() should be avoided; use sigaction(2) instead.

    On older Linux systems, sysv_signal() and signal(2) were equivalent. But on newer systems, signal(2) provides reliable signal semantics; see signal(2) for details.

    The use of sighandler_t is a GNU extension; this type is only defined if the _GNU_SOURCE feature test macro is defined.  

    SEE ALSO

    sigaction(2), signal(2), bsd_signal(3), feature_test_macros(7), signal(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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