siginterrupt man page on Ultrix

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siginterrupt(3)						       siginterrupt(3)

Name
       siginterrupt - allow signals to interrupt system calls

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

Description
       The system call 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  transferring  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
       systems.

       Note  that  the	new  signal  handling semantics are not altered in any
       other way.  Most notably, signal handlers always remain installed until
       explicitly  changed  by a subsequent call, and the signal mask operates
       as documented in Programs may switch between restartable and interruptā€
       ible  system  call  operation as often as desired in the execution of a
       program.

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

Environment
       This  library  routine uses an extension of the system call that is not
       available in ULTRIX 2.0 or earlier versions.  Hence it  should  not  be
       used if backward compatibility is needed.

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

See Also
       sigvec(2), sigblock(2), sigpause(2), sigsetmask(2)

4.3 Berkeley Distribution				       siginterrupt(3)
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