Ian Lance Taylor <ian@xxxxxxxx> writes: > What is the logic behind obsoleting AC_SYS_RESTARTABLE_SYSCALLS in > current versions of autoconf? I searched the mailing lists at > gnu.org Here's the announcement of that change: http://mail.gnu.org/archive/html/bug-autoconf/2001-06/msg00042.html Short summary: I surveyed uses of AC_SYS_RESTARTABLE_SYSCALLS in GNU code, and found only one use (in Bash), and it was used incorrectly. I therefore concluded AC_SYS_RESTARTABLE_SYSCALLS was not needed any more, and (worse) that it was confusing Autoconf users. > The manual, and the program, suggest using sigaction with SA_RESTART. > This is obviously useless. Firstly not every system supports > SA_RESTART Which systems don't? That info would be good to add to the manual. > AC_SYS_RESTARTABLE_SYSCALLS is for systems which do not provide > sigaction. That part of the manual gives advice to people writing new code, and I think it's safe to assume SA_RESTART in newly written code. Many GNU programs do that now, to no ill effect that I know of. If I'm wrong, though, I'd like to fix the manual. AC_SYS_RESTARTABLE_SYSCALLS is still in autoconf, so nothing has been broken (yet :-). If people still need it for something, we'll keep it.
