zsh-3.1.5 zsh-3.1.5

1 files changed, 94 insertions, 0 deletions

diff --git a/Src/signals.h b/Src/signals.h
new file mode 100644
index 000000000..b6485e6b3
--- /dev/null
+++ b/Src/signals.h
@@ -0,0 +1,94 @@
+/*
+ * signals.h - header file for signals handling code
+ *
+ * This file is part of zsh, the Z shell.
+ *
+ * Copyright (c) 1992-1997 Paul Falstad
+ * All rights reserved.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and to distribute modified versions of this software for any
+ * purpose, provided that the above copyright notice and the following
+ * two paragraphs appear in all copies of this software.
+ *
+ * In no event shall Paul Falstad or the Zsh Development Group be liable
+ * to any party for direct, indirect, special, incidental, or consequential
+ * damages arising out of the use of this software and its documentation,
+ * even if Paul Falstad and the Zsh Development Group have been advised of
+ * the possibility of such damage.
+ *
+ * Paul Falstad and the Zsh Development Group specifically disclaim any
+ * warranties, including, but not limited to, the implied warranties of
+ * merchantability and fitness for a particular purpose.  The software
+ * provided hereunder is on an "as is" basis, and Paul Falstad and the
+ * Zsh Development Group have no obligation to provide maintenance,
+ * support, updates, enhancements, or modifications.
+ *
+ */
+
+#define SIGNAL_HANDTYPE RETSIGTYPE (*)_((int))
+
+#ifndef HAVE_KILLPG
+# define killpg(pgrp,sig) kill(-(pgrp),sig)
+#endif
+
+#define SIGZERR   (SIGCOUNT+1)
+#define SIGDEBUG  (SIGCOUNT+2)
+#define VSIGCOUNT (SIGCOUNT+3)
+#define SIGEXIT    0
+
+#ifdef SV_BSDSIG
+# define SV_INTERRUPT SV_BSDSIG
+#endif
+
+/* If not a POSIX machine, then we create our *
+ * own POSIX style signal sets functions.     */
+#ifndef POSIX_SIGNALS
+# define sigemptyset(s)    (*(s) = 0)
+# if NSIG == 32
+#  define sigfillset(s)    (*(s) = ~(sigset_t)0, 0)
+# else
+#  define sigfillset(s)    (*(s) = (1 << NSIG) - 1, 0)
+# endif
+# define sigaddset(s,n)    (*(s) |=  (1 << ((n) - 1)), 0)
+# define sigdelset(s,n)    (*(s) &= ~(1 << ((n) - 1)), 0)
+# define sigismember(s,n)  ((*(s) & (1 << ((n) - 1))) != 0)
+#endif   /* ifndef POSIX_SIGNALS */
+ 
+#define child_block()      signal_block(signal_mask(SIGCHLD))
+#define child_unblock()    signal_unblock(signal_mask(SIGCHLD))
+#define child_suspend(S)   signal_suspend(SIGCHLD, S)
+
+/* ignore a signal */
+#define signal_ignore(S)   signal(S, SIG_IGN)
+
+/* return a signal to it default action */
+#define signal_default(S)  signal(S, SIG_DFL)
+
+/* Use a circular queue to save signals caught during    *
+ * critical sections of code.  You call queue_signals to *
+ * start queueing, and unqueue_signals to process the    *
+ * queue and stop queueing.  Since the kernel doesn't    *
+ * queue signals, it is probably overkill for zsh to do  *
+ * this, but it shouldn't hurt anything to do it anyway. */
+
+/* Right now I'm queueing all signals, but maybe we only *
+ * need to queue SIGCHLD.  Anybody know?                 */
+
+#define MAX_QUEUE_SIZE 16
+
+#define queue_signals()    (queueing_enabled++)
+
+#define unqueue_signals()  do { \
+    DPUTS(!queueing_enabled, "BUG: unqueue_signals called but not queueing"); \
+    if (!--queueing_enabled) { \
+	while (queue_front != queue_rear) {      /* while signals in queue */ \
+	    sigset_t oset; \
+	    queue_front = (queue_front + 1) % MAX_QUEUE_SIZE; \
+	    oset = signal_setmask(signal_mask_queue[queue_front]); \
+	    handler(signal_queue[queue_front]);  /* handle queued signal   */ \
+	    signal_setmask(oset); \
+	} \
+    } \
+} while (0)