* Re: FreeBSD compatability feature request
2004-04-17 22:22 FreeBSD compatability feature request Vincent Stemen
2004-04-18 18:10 ` Peter Stephenson
@ 2004-04-19 11:28 ` Peter Stephenson
1 sibling, 0 replies; 3+ messages in thread
From: Peter Stephenson @ 2004-04-19 11:28 UTC (permalink / raw)
To: Vincent Stemen, zsh-users
Vincent Stemen wrote:
> Here is the FreeBSD manual entry:
>
> -T trapsasync
> When waiting for a child, execute traps immediately. If this
> option is not set, traps are executed after the child exits,
> as specified in IEEE Std 1003.2 (``POSIX.2'') This nonstandard
> option is useful for putting guarding shells around children
> that block signals. The surrounding shell may kill the child
> or it may just return control to the tty and leave the child
> alone, like this:
>
> sh -T -c "trap 'exit 1' 2 ; some-blocking-program"
Good(ish) news...
Just tried this out, and it looks like the `trapsasync' behaviour
is the standard (and only) one in zsh. Hence it doesn't conform to
POSIX (which isn't likely to be an earth-shattering revelation to zsh
regulars).
This means that almost everything we need for both behaviours is already
there. It remains to add the option TRAPS_ASYNC, turned on by default
in non-Bourne mode for compatibility, and make sure we can still handle
SIGCHLD when the option is unset.
Someone already had the foresight to handle sh options separately, so -T
does the right thing in sh or ksh emulation and the example you gave
should now work as expected.
Further follow-ups should probably go to zsh-workers.
Index: Doc/Zsh/options.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/options.yo,v
retrieving revision 1.30
diff -u -r1.30 options.yo
--- Doc/Zsh/options.yo 6 Mar 2004 00:23:03 -0000 1.30
+++ Doc/Zsh/options.yo 19 Apr 2004 11:13:25 -0000
@@ -1189,6 +1189,14 @@
Remove any right prompt from display when accepting a command
line. This may be useful with terminals with other cut/paste methods.
)
+pindex(TRAPS_ASYNC)
+cindex(traps, asynchronous)
+item(tt(TRAPS_ASYNC) <C> <Z>)(
+While waiting for a program to exit, run traps immediately. Otherwise
+the trap is run after the program has exited. Note this does not affect
+the point at which traps are run for any case other than when the shell is
+waiting for a child process.
+)
pindex(TYPESET_SILENT)
item(tt(TYPESET_SILENT))(
If this is unset, executing any of the `tt(typeset)' family of
@@ -1366,6 +1374,7 @@
subsect(sh/ksh emulation set)
startsitem()
sitem(tt(-C))(em(NO_)CLOBBER)
+sitem(tt(-T))(TRAPS_ASYNC)
sitem(tt(-X))(MARK_DIRS)
sitem(tt(-a))(ALL_EXPORT)
sitem(tt(-b))(NOTIFY)
Index: Src/jobs.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/jobs.c,v
retrieving revision 1.25
diff -u -r1.25 jobs.c
--- Src/jobs.c 17 Feb 2004 10:41:37 -0000 1.25
+++ Src/jobs.c 19 Apr 2004 11:13:25 -0000
@@ -994,7 +994,11 @@
int q = queue_signal_level();
Job jn = jobtab + job;
- dont_queue_signals();
+ queue_not_sigchld++;
+ if (isset(TRAPSASYNC))
+ dont_queue_signals();
+ else
+ queue_signals();
child_block(); /* unblocked during child_suspend() */
if (jn->procs || jn->auxprocs) { /* if any forks were done */
jn->stat |= STAT_LOCKED;
@@ -1026,6 +1030,9 @@
}
child_unblock();
restore_queue_signals(q);
+ if (!queueing_enabled)
+ run_queued_signals();
+ queue_not_sigchld--;
}
/* wait for running job to finish */
Index: Src/options.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/options.c,v
retrieving revision 1.17
diff -u -r1.17 options.c
--- Src/options.c 6 Mar 2004 00:23:03 -0000 1.17
+++ Src/options.c 19 Apr 2004 11:13:25 -0000
@@ -203,6 +203,7 @@
{NULL, "singlelinezle", OPT_KSH, SINGLELINEZLE},
{NULL, "sunkeyboardhack", 0, SUNKEYBOARDHACK},
{NULL, "transientrprompt", 0, TRANSIENTRPROMPT},
+{NULL, "trapsasync", OPT_EMULATE|OPT_NONBOURNE, TRAPSASYNC},
{NULL, "typesetsilent", OPT_EMULATE|OPT_BOURNE, TYPESETSILENT},
{NULL, "unset", OPT_EMULATE|OPT_BSHELL, UNSET},
{NULL, "verbose", 0, VERBOSE},
@@ -346,7 +347,7 @@
/* Q */ 0,
/* R */ 0,
/* S */ 0,
- /* T */ 0,
+ /* T */ TRAPSASYNC,
/* U */ 0,
/* V */ 0,
/* W */ 0,
Index: Src/signals.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/signals.c,v
retrieving revision 1.25
diff -u -r1.25 signals.c
--- Src/signals.c 25 Mar 2004 10:07:15 -0000 1.25
+++ Src/signals.c 19 Apr 2004 11:13:25 -0000
@@ -49,7 +49,7 @@
/* Variables used by signal queueing */
/**/
-mod_export int queueing_enabled, queue_front, queue_rear;
+mod_export int queueing_enabled, queue_front, queue_rear, queue_not_sigchld;
/**/
mod_export int signal_queue[MAX_QUEUE_SIZE];
/**/
@@ -425,7 +425,8 @@
}
#endif
- if (queueing_enabled) { /* Are we queueing signals now? */
+ /* Are we queueing signals now? */
+ if (queueing_enabled && (sig != SIGCHLD || !queue_not_sigchld)) {
int temp_rear = ++queue_rear % MAX_QUEUE_SIZE;
DPUTS(temp_rear == queue_front, "BUG: signal queue full");
Index: Src/zsh.h
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/zsh.h,v
retrieving revision 1.54
diff -u -r1.54 zsh.h
--- Src/zsh.h 11 Mar 2004 14:25:12 -0000 1.54
+++ Src/zsh.h 19 Apr 2004 11:13:25 -0000
@@ -1523,6 +1523,7 @@
SINGLELINEZLE,
SUNKEYBOARDHACK,
TRANSIENTRPROMPT,
+ TRAPSASYNC,
TYPESETSILENT,
UNSET,
VERBOSE,
--
Peter Stephenson <pws@csr.com> Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK Tel: +44 (0)1223 692070
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