siginterrupt(3)    UNIX System V(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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