signal.2 (2010 09)

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.

The use of this function is unspeciﬁed in a multithreaded process.

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.