HP-UX Reference (11i v2 04/09) - 2 System Calls (vol 5)

signal(2) signal(2)

then test the variables. If they have not changed, call

sigpause() to wait for the signal.

Threads Considerations

The signal disposition (such as catch/ignore/default) established by

signal() is shared by all threads in

the process. Blocked signal masks are maintained by each thread.

signal() is used to set the signal disposition for sig to

SIG_IGN or to SIG_DFL for a signal whose

default action is to ignore the signal, any instances of sig pending on the process or any of the threads

will be discarded. The signals are discarded regardless of whether the signal is blocked by any of the

threads.

For more information regarding signals and threads, refer to signal (5).

EXAMPLES

The following call to

signal() sets up a signal-catching function for the

SIGINT signal:

void myhandler();

(void) signal(SIGINT, myhandler);

WARNINGS

signal() should not be used in conjunction with the facilities described under bsdproc (3C), sigac-

tion (2), sigset (3C), or sigvector (2).

signal() does not detect an invalid value for action , and if it does not equal SIG_DFL

or SIG_IGN,

or point to a valid function address, subsequent receipt of the signal sig causes undeﬁned results.

AUTHOR

signal() was developed by HP, AT&T, and the University of California, Berkeley.