sunos man page for siginterrupt

siginterrupt(3UCB)				     SunOS/BSD Compatibility Library Functions					siginterrupt(3UCB)

NAME
       siginterrupt - allow signals to interrupt functions

SYNOPSIS
       /usr/ucb/cc [ flag ... ] file ...

       int siginterrupt( sig,  flag);
	     int sig, flag;

DESCRIPTION
       siginterrupt() is used to change the function restart behavior when a function is interrupted by the specified signal. If the flag is false(0), then functions will be restarted if they are interrupted by the specified signal and no data has been  transferred	yet.  System  call
       restart is the default behavior when the signal(3C) routine is used.

       If the flag is true,   (1), then restarting of functions is disabled.  If a function is interrupted by the specified signal and no data has
       been transferred, the function will return
	-1 with errno set to EINTR. Interrupted functions that have started transferring data will return the amount of data actually transferred.

       Issuing a siginterrupt() call during the execution of a signal handler will cause the new action to take place on the  next  signal  to	be
       caught.

NOTES
       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-threaded applications is unsupported.

       This library routine uses an extension of the sigvec(3UCB) function that is not available in 4.2 BSD, hence it should not be used if  back-
       ward compatibility is needed.

RETURN VALUES
       A  0 value indicates that the call succeeded. A	-1 value indicates that the call failed and  errno is set to indicate the error.

ERRORS
       siginterrupt() may return the following error:

       EINVAL	sig is not a valid signal.

SEE ALSO
       sigblock(3UCB), sigvec(3UCB), signal(3C)

SunOS 5.10							    19 Feb 1993 						siginterrupt(3UCB)