Library /sys$common/syshlp/helplib.hlb  —  CRTL  sigpause  Description
    See the sigblock function for information about the mask
    argument.

    When control returns to sigpause, the function restores the
    previous set of masked signals, sets errno to EINTR, and returns
    -1 to indicate an interrupt. The value EINTR is defined in the
    <errno.h> header file.
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