Commit 41f9404e authored by Glenn Morris's avatar Glenn Morris

* configure.in (BROKEN_SA_RESTART): Doc fix.

* src/sysdep.c, src/s/irix6-5.h: Related comments.
parent 929e7845
2012-07-07 Glenn Morris <rgm@gnu.org>
* configure.in (BROKEN_SA_RESTART): Doc fix.
* configure.in: Rather than checking for things then undef'ing
them on some platforms, simply don't check for them.
(getwd): Don't check for it on unixware.
......
......@@ -3140,9 +3140,11 @@ case $opsys in
gnu-kfreebsd) opsysfile="s/gnu-linux.h" ;;
hpux11)
dnl SA_RESTART resets the timeout of `select', so don't use it.
AC_DEFINE(BROKEN_SA_RESTART, 1, [Define if SA_RESTART should not
be used.])
dnl See comments in sysdep.c:sys_signal.
dnl SA_RESTART resets the timeout of `select' on hpux11.
dnl Defining BROKEN_SA_RESTART is not the same as undef'ing SA_RESTART.
AC_DEFINE(BROKEN_SA_RESTART, 1, [Define if SA_RESTART should only
be used in batch mode.])
dnl It works to open the pty's tty in the parent (Emacs), then
dnl close and reopen it in the child.
AC_DEFINE(USG_SUBTTY_WORKS, 1, [Define for USG systems where it
......
......@@ -80,7 +80,7 @@ char *_getpty();
#define NARROWPROTO 1
#undef SA_RESTART
#undef SA_RESTART /* not the same as defining BROKEN_SA_RESTART */
#undef TIOCSIGSEND /* defined in usg5-4-common.h */
......
......@@ -1484,9 +1484,10 @@ sys_signal (int signal_number, signal_handler_t action)
#if defined (SA_RESTART)
/* Emacs mostly works better with restartable system services. If this
flag exists, we probably want to turn it on here.
However, on some systems this resets the timeout of `select'
which means that `select' never finishes if it keeps getting signals.
BROKEN_SA_RESTART is defined on those systems. */
However, on some systems (only hpux11 at present) this resets the
timeout of `select' which means that `select' never finishes if
it keeps getting signals.
We define BROKEN_SA_RESTART on those systems. */
/* It's not clear why the comment above says "mostly works better". --Stef
When SYNC_INPUT is set, we don't want SA_RESTART because we need to poll
for pending input so we need long-running syscalls to be interrupted
......
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