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BSD 2.11 - man page for siginterrupt (bsd section 3)

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       siginterrupt - allow signals to interrupt system calls

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

       Siginterrupt  is  used  to  change  the system call restart behavior when a system call is
       interrupted by the specified signal.  If the flag is false (0), then system calls 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 on 4.2 BSD.

       If the flag is true (1), then restarting of system calls is disabled.  If a system call is
       interrupted by the specified signal and no data has been transferred, the system call will
       return -1 with errno set to EINTR.  Interrupted system calls that have  started	transfer-
       ring  data  will return the amount of data actually transferred.  System call interrupt is
       the signal behavior found on 4.1 BSD and AT&T System V UNIX systems.

       Note that the new 4.2 BSD signal handling semantics are not  altered  in  any  other  way.
       Most notably, signal handlers always remain installed until explicitly changed by a subse-
       quent sigvec(2) call, and the signal mask operates as documented in  sigvec(2).	 Programs
       may switch between restartable and interruptible system call operation as often as desired
       in the execution of a program.

       Issuing a siginterrupt(3) call during the execution of a signal handler will cause the new
       action to take place on the next signal to be caught.

       This  library routine uses an extension of the sigvec(2) system call that is not available
       in 4.2BSD, hence it should not be used if backward compatibility is needed.

       A 0 value indicates that the call succeeded.  A -1 value indicates that an invalid  signal
       number has been supplied.

       sigvec(2), sigblock(2), sigpause(2), sigsetmask(2).

4.3 Berkeley Distribution		   May 15, 1985 			  SIGINTERRUPT(3)
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