raise—send a signal #include <signal.h>
int raise(int sig);
int _raise_r(void *reent, int sig);
Description
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.
Returns
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 signal.
Portability
ANSI C requires raise, but allows the full set of signal numbers
to vary from one implementation to another.
Required OS subroutines: getpid, kill.