On Friday 28 February 2003 11:23, you wrote: > On Thu, Feb 27, 2003 at 11:43:08AM -0800, Seth Arnold wrote: > > On Thu, Feb 27, 2003 at 08:30:50PM +0100, Frank A. Uepping wrote: > > > > #define ERESTARTNOHAND 514 /* restart if no handler.. */ > > > > > > What handler (signal handler)? > > > > Yes; BSD introduced restartable systemcalls around 1985 or so; if the > > system call was interrupted by a signal, rather than simply returning > > EINTR, it would try to restart the system call for the process. > > > > I suggest checking out W Richard Stevens's absolutely wonderful book, > > Advanced Programming in the Unix Environment. It is well worth its cost. > > ... the syscall is restarted if: > > - It returns -ERESTARTSYS and the signal handler did not exit via > a longjump or terminate the process. > - It returns -ERESTARTNOHAND and the signal is ignored. It should set > errno EINTR if it is handled since ERESTARTNOHAND is only defined in > kernel. > >---- Jan 'Bulb' Hudec <bulb@ucw.cz> That is -ERESTARTNOHAND makes that the SA_RESTART flag is ignored (when there is a sig handler). Thus someone should use this in a file_operations::poll() when a signal arrives here, because select() is never subject to restarting, right? /FAU -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
