Flatten bind9 vendor work area

1 files changed, 204 insertions, 0 deletions

diff --git a/lib/isc/unix/resource.c b/lib/isc/unix/resource.c
new file mode 100644
index 0000000..703ec27
--- /dev/null
+++ b/lib/isc/unix/resource.c
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2000, 2001  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: resource.c,v 1.12 2004/03/05 05:11:46 marka Exp $ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/time.h>	/* Required on some systems for <sys/resource.h>. */
+#include <sys/resource.h>
+
+#include <isc/platform.h>
+#include <isc/resource.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+static isc_result_t
+resource2rlim(isc_resource_t resource, int *rlim_resource) {
+	isc_result_t result = ISC_R_SUCCESS;
+
+	switch (resource) {
+	case isc_resource_coresize:
+		*rlim_resource = RLIMIT_CORE;
+		break;
+	case isc_resource_cputime:
+		*rlim_resource = RLIMIT_CPU;
+		break;		
+	case isc_resource_datasize:
+		*rlim_resource = RLIMIT_DATA;
+		break;		
+	case isc_resource_filesize:
+		*rlim_resource = RLIMIT_FSIZE;
+		break;		
+	case isc_resource_lockedmemory:
+#ifdef RLIMIT_MEMLOCK
+		*rlim_resource = RLIMIT_MEMLOCK;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_openfiles:
+#ifdef RLIMIT_NOFILE
+		*rlim_resource = RLIMIT_NOFILE;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_processes:
+#ifdef RLIMIT_NPROC
+		*rlim_resource = RLIMIT_NPROC;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_residentsize:
+#ifdef RLIMIT_RSS
+		*rlim_resource = RLIMIT_RSS;
+#else
+		result = ISC_R_NOTIMPLEMENTED;
+#endif
+		break;
+	case isc_resource_stacksize:
+		*rlim_resource = RLIMIT_STACK;
+		break;
+	default:
+                /*
+		 * This test is not very robust if isc_resource_t
+		 * changes, but generates a clear assertion message.
+		 */
+		REQUIRE(resource >= isc_resource_coresize &&
+			resource <= isc_resource_stacksize);
+
+		result = ISC_R_RANGE;
+		break;
+	}
+
+	return (result);
+}
+
+isc_result_t
+isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value) {
+	struct rlimit rl;
+	ISC_PLATFORM_RLIMITTYPE rlim_value;
+	int unixresult;
+	int unixresource;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result != ISC_R_SUCCESS)
+		return (result);
+
+	if (value == ISC_RESOURCE_UNLIMITED)
+		rlim_value = RLIM_INFINITY;
+
+	else {
+		/*
+		 * isc_resourcevalue_t was chosen as an unsigned 64 bit
+		 * integer so that it could contain the maximum range of
+		 * reasonable values.  Unfortunately, this exceeds the typical
+		 * range on Unix systems.  Ensure the range of
+		 * ISC_PLATFORM_RLIMITTYPE is not overflowed.
+		 */
+		isc_resourcevalue_t rlim_max;
+		isc_boolean_t rlim_t_is_signed =
+			ISC_TF(((double)(ISC_PLATFORM_RLIMITTYPE)-1) < 0);
+
+		if (rlim_t_is_signed)
+			rlim_max = ~((ISC_PLATFORM_RLIMITTYPE)1 <<
+				     (sizeof(ISC_PLATFORM_RLIMITTYPE) * 8 - 1));
+		else
+			rlim_max = (ISC_PLATFORM_RLIMITTYPE)-1;
+
+		if (value > rlim_max)
+			value = rlim_max;
+
+		rlim_value = value;
+	}
+
+	/*
+	 * The BIND 8 documentation reports:
+	 *
+	 *	Note: on some operating systems the server cannot set an
+	 *	unlimited value and cannot determine the maximum number of
+	 *	open files the kernel can support. On such systems, choosing
+	 *	unlimited will cause the server to use the larger of the
+	 *	rlim_max for RLIMIT_NOFILE and the value returned by
+	 *	sysconf(_SC_OPEN_MAX). If the actual kernel limit is larger
+	 *	than this value, use limit files to specify the limit
+	 *	explicitly.
+	 *
+	 * The CHANGES for 8.1.2-T3A also mention:
+	 *
+	 *	352. [bug] Because of problems with setting an infinite
+	 *	rlim_max for RLIMIT_NOFILE on some systems, previous versions
+	 *	of the server implemented "limit files unlimited" by setting
+	 *	the limit to the value returned by sysconf(_SC_OPEN_MAX).  The
+	 *	server will now use RLIM_INFINITY on systems which allow it.
+	 *
+	 * At some point the BIND 8 server stopped using SC_OPEN_MAX for this
+	 * purpose at all, but it isn't clear to me when or why, as my access
+	 * to the CVS archive is limited at the time of this writing.  What
+	 * BIND 8 *does* do is to set RLIMIT_NOFILE to either RLIMIT_INFINITY
+	 * on a half dozen operating systems or to FD_SETSIZE on the rest,
+	 * the latter of which is probably fewer than the real limit.  (Note
+	 * that libisc's socket module will have problems with any fd over
+	 * FD_SETSIZE.  This should be fixed in the socket module, not a
+	 * limitation here.  BIND 8's eventlib also has a problem, making
+	 * its RLIMIT_INFINITY setting useless, because it closes and ignores
+	 * any fd over FD_SETSIZE.)
+	 *
+	 * More troubling is the reference to some operating systems not being
+	 * able to set an unlimited value for the number of open files.  I'd
+	 * hate to put in code that is really only there to support archaic
+	 * systems that the rest of libisc won't work on anyway.  So what this
+	 * extremely verbose comment is here to say is the following:
+	 *
+	 *   I'm aware there might be an issue with not limiting the value
+	 *   for RLIMIT_NOFILE on some systems, but since I don't know yet
+	 *   what those systems are and what the best workaround is (use
+	 *   sysconf()?  rlim_max from getrlimit()?  FD_SETSIZE?) so nothing
+	 *   is currently being done to clamp the value for open files.
+	 */
+
+	rl.rlim_cur = rl.rlim_max = rlim_value;
+	unixresult = setrlimit(unixresource, &rl);
+
+	if (unixresult == 0)
+		return (ISC_R_SUCCESS);
+	else
+		return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_resource_getlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	int unixresult;
+	int unixresource;
+	struct rlimit rl;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result == ISC_R_SUCCESS) {
+		unixresult = getrlimit(unixresource, &rl);
+		INSIST(unixresult == 0);
+		*value = rl.rlim_max;
+	}
+
+	return (result);
+}