add a worklist framework, which will be used for atomic operations on

files.

suggested and help by deraadt@

1 files changed, 92 insertions, 0 deletions

diff --git a/usr.bin/cvs/worklist.c b/usr.bin/cvs/worklist.c
new file mode 100644
index 00000000000..2c6ae0bd0e5
--- /dev/null
+++ b/usr.bin/cvs/worklist.c
@@ -0,0 +1,92 @@
+/*	$OpenBSD: worklist.c,v 1.1 2006/03/08 20:18:41 joris Exp $	*/
+/*
+ * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#include "log.h"
+#include "worklist.h"
+#include "xmalloc.h"
+
+/*
+ * adds an path to a worklist.
+ */
+void
+cvs_worklist_add(const char *path, struct cvs_wklhead *worklist)
+{
+	size_t len;
+	struct cvs_worklist *wkl;
+	sigset_t old, new;
+
+	wkl = (struct cvs_worklist *)xmalloc(sizeof(*wkl));
+	memset(wkl, 0, sizeof(*wkl));
+
+	len = strlcpy(wkl->wkl_path, path, sizeof(wkl->wkl_path));
+	if (len >= sizeof(wkl->wkl_path))
+		fatal("path truncation in cvs_worklist_add");
+
+	sigfillset(&new);
+	sigprocmask(SIG_BLOCK, &new, &old);
+	SLIST_INSERT_HEAD(worklist, wkl, wkl_list);
+	sigprocmask(SIG_SETMASK, &old, NULL);
+}
+
+/*
+ * run over the given worklist, calling cb for each element.
+ * this is just like cvs_worklist_clean(), except we block signals first.
+ */
+void
+cvs_worklist_run(struct cvs_wklhead *list, void (*cb)(struct cvs_worklist *))
+{
+	sigset_t old, new;
+
+	sigfillset(&new);
+	sigprocmask(SIG_BLOCK, &new, &old);
+
+	cvs_worklist_clean(list, cb);
+
+	sigprocmask(SIG_SETMASK, &old, NULL);
+}
+
+/*
+ * clean the worklist by passing the elements to the specified callback
+ */
+void
+cvs_worklist_clean(struct cvs_wklhead *list, void (*cb)(struct cvs_worklist *))
+{
+	struct cvs_worklist *wkl;
+
+	while ((wkl = SLIST_FIRST(list)) != NULL) {
+		SLIST_REMOVE_HEAD(list, wkl_list);
+		cb(wkl);
+		xfree(wkl);
+	}
+}
+
+void
+cvs_worklist_unlink(struct cvs_worklist *wkl)
+{
+	(void)unlink(wkl->wkl_path);
+}