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`raise'--send a signal

     #include <signal.h>
     int raise(int SIG);
     int _raise_r(void *REENT, int SIG);
Send the signal SIG (one of the macros from ``sys/signal.h'').  This
interrupts your program's normal flow of execution, and allows a signal
handler (if you've defined one, using `signal') to take control.
   The alternate function `_raise_r' is a reentrant version.  The extra
argument REENT is a pointer to a reentrancy structure.
The result is `0' if SIG was successfully raised, `1' otherwise.
However, the return value (since it depends on the normal flow of
execution) may not be visible, unless the signal handler for SIG
terminates with a `return' or unless `SIG_IGN' is in effect for this
ANSI C requires `raise', but allows the full set of signal numbers to
vary from one implementation to another.
   Required OS subroutines: `getpid', `kill'.