xfunc_die: resurrect (actually, it's "svn add" being forgotten again)

diff --git a/libbb/xfunc_die.c b/libbb/xfunc_die.c
new file mode 100644 (file)
index 0000000..357494d
--- /dev/null
+++ b/libbb/xfunc_die.c
@@ -0,0 +1,40 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2008 by Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ */
+
+/* Keeping it separate allows to NOT suck in stdio for VERY small applets.
+ * Try building busybox with only "true" enabled... */
+
+#include "libbb.h"
+
+int die_sleep;
+#if ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH
+jmp_buf die_jmp;
+#endif
+
+void xfunc_die(void)
+{
+       if (die_sleep) {
+               if ((ENABLE_FEATURE_PREFER_APPLETS || ENABLE_HUSH)
+                && die_sleep < 0
+               ) {
+                       /* Special case. We arrive here if NOFORK applet
+                        * calls xfunc, which then decides to die.
+                        * We don't die, but jump instead back to caller.
+                        * NOFORK applets still cannot carelessly call xfuncs:
+                        * p = xmalloc(10);
+                        * q = xmalloc(10); // BUG! if this dies, we leak p!
+                        */
+                       /* -2222 means "zero" (longjmp can't pass 0)
+                        * run_nofork_applet() catches -2222. */
+                       longjmp(die_jmp, xfunc_error_retval ? xfunc_error_retval : -2222);
+               }
+               sleep(die_sleep);
+       }
+       exit(xfunc_error_retval);
+}