Imported Upstream version 0.4.0

[deb_pkgs/spamass-milter.git] / daemon.c

diff --git a/daemon.c b/daemon.c
new file mode 100644 (file)
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--- /dev/null
+++ b/daemon.c
@@ -0,0 +1,74 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *     The Regents of the University of California.  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. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)daemon.c   8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+/* $FreeBSD: src/lib/libc/gen/daemon.c,v 1.5 2002/02/01 00:57:29 obrien Exp $ */
+
+/* $Id: daemon.c,v 1.1 2003/10/21 21:40:32 dnelson Exp $ */
+
+#include <fcntl.h>
+#include <paths.h>
+#include <unistd.h>
+
+int
+daemon(nochdir, noclose)
+       int nochdir, noclose;
+{
+       int fd;
+
+       switch (fork()) {
+       case -1:
+               return (-1);
+       case 0:
+               break;
+       default:
+               _exit(0);
+       }
+
+       if (setsid() == -1)
+               return (-1);
+
+       if (!nochdir)
+               (void)chdir("/");
+
+       if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
+               (void)dup2(fd, STDIN_FILENO);
+               (void)dup2(fd, STDOUT_FILENO);
+               (void)dup2(fd, STDERR_FILENO);
+               if (fd > 2)
+                       (void)~close(fd);
+       }
+       return (0);
+}