siginterrupt(3)         (BSD Compatibility Package)         siginterrupt(3)


   NAME
         siginterrupt - allow signals to interrupt system calls

   SYNOPSIS
         cc [ flag... ] file ... -lucb

         int 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 when the signal(3)
         routine is used.

         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.

         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
         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.

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

   SEE ALSO
         sigblock(3), sigpause(3), sigsetmask(3), sigvec(3), signal(3).

         signal(2) in the Programmer's Reference Manual.













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