# 2.11BSD#431 - /usr/man/cat3/siginterrupt.0

    SIGINTERRUPT(3)     UNIX Programmer's Manual	  SIGINTERRUPT(3)

    NAME
         siginterrupt - allow signals to interrupt system calls

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

    DESCRIPTION
         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 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
         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 docu-
         mented in sigvec(2).  Programs may switch between restart-
         able 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.

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

    RETURN VALUE
         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).

    Printed 11/26/99	  May 15, 1985				1

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