Add daemon function for Solaris 10 which lacks it.

compat/Makefile.am

@@ -137,6 +137,12 @@ libcompat_la_SOURCES += getifaddrs_solaris.c
 endif
 endif
 
+if !HAVE_DAEMON
+if HOST_SOLARIS
+libcompat_la_SOURCES += daemon_solaris.c
+endif
+endif
+
 if !HAVE_ARC4RANDOM_UNIFORM
 libcompat_la_SOURCES += arc4random_uniform.c
 endif

compat/daemon_solaris.c

@@ -0,0 +1,64 @@
+/*	$OpenBSD: daemon.c,v 1.7 2010/07/27 22:29:09 marco Exp $ */
+/*-
+ * 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. 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.
+ */
+
+#include <fcntl.h>
+#include <paths.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+int
+daemon(int nochdir, int 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);
+}

configure.ac

@@ -101,7 +101,7 @@ LDFLAGS="$LDFLAGS $CLANG_FLAGS"
 # check functions that are expected to be in libc
 AC_CHECK_FUNCS([adjfreq ntp_adjtime adjtimex])
 AC_CHECK_FUNCS([arc4random arc4random_uniform asprintf explicit_bzero])
-AC_CHECK_FUNCS([closefrom getentropy memmem poll reallocarray])
+AC_CHECK_FUNCS([closefrom daemon getentropy memmem poll reallocarray])
 AC_CHECK_FUNCS([setproctitle setgroups])
 AC_CHECK_FUNCS([setregid setresgid setreuid setresuid])
 AC_CHECK_FUNCS([strlcat strlcpy strtonum sysconf])
@@ -128,6 +128,7 @@ AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
 AM_CONDITIONAL([HAVE_CLOSEFROM], [test "x$ac_cv_func_closefrom" = xyes])
 AM_CONDITIONAL([HAVE_CLOCK_GETRES], [test "x$ac_cv_func_clock_getres" = xyes])
 AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "x$ac_cv_func_clock_gettime" = xyes])
+AM_CONDITIONAL([HAVE_DAEMON], [test "x$ac_cv_func_daemon" = xyes])
 AM_CONDITIONAL([HAVE_EXPLICIT_BZERO], [test "x$ac_cv_func_explicit_bzero" = xyes])
 AM_CONDITIONAL([HAVE_GETENTROPY], [test "x$ac_cv_func_getentropy" = xyes])
 AM_CONDITIONAL([HAVE_IFADDRS_H], [test "x$ac_cv_header_ifaddrs_h" = xyes])