Adding upstream version 1:9.18.19.upstream/1%9.18.19upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/lib/isc/resource.c b/lib/isc/resource.c
new file mode 100644
index 0000000..d83762c
--- /dev/null
+++ b/lib/isc/resource.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <sys/resource.h>
+#include <sys/time.h> /* Required on some systems for <sys/resource.h>. */
+#include <sys/types.h>
+
+#include <isc/resource.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#ifdef __linux__
+#include <linux/fs.h> /* To get the large NR_OPEN. */
+#endif		      /* ifdef __linux__ */
+
+#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  /* ifdef RLIMIT_MEMLOCK */
+		result = ISC_R_NOTIMPLEMENTED;
+#endif /* ifdef RLIMIT_MEMLOCK */
+		break;
+	case isc_resource_openfiles:
+#ifdef RLIMIT_NOFILE
+		*rlim_resource = RLIMIT_NOFILE;
+#else  /* ifdef RLIMIT_NOFILE */
+		result = ISC_R_NOTIMPLEMENTED;
+#endif /* ifdef RLIMIT_NOFILE */
+		break;
+	case isc_resource_processes:
+#ifdef RLIMIT_NPROC
+		*rlim_resource = RLIMIT_NPROC;
+#else  /* ifdef RLIMIT_NPROC */
+		result = ISC_R_NOTIMPLEMENTED;
+#endif /* ifdef RLIMIT_NPROC */
+		break;
+	case isc_resource_residentsize:
+#ifdef RLIMIT_RSS
+		*rlim_resource = RLIMIT_RSS;
+#else  /* ifdef RLIMIT_RSS */
+		result = ISC_R_NOTIMPLEMENTED;
+#endif /* ifdef RLIMIT_RSS */
+		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;
+	rlim_t 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
+		 * rlim_t is not overflowed.
+		 */
+		isc_resourcevalue_t rlim_max;
+		bool rlim_t_is_signed = (((double)(rlim_t)-1) < 0);
+
+		if (rlim_t_is_signed) {
+			rlim_max = ~((rlim_t)1 << (sizeof(rlim_t) * 8 - 1));
+		} else {
+			rlim_max = (rlim_t)-1;
+		}
+
+		if (value > rlim_max) {
+			value = rlim_max;
+		}
+
+		rlim_value = value;
+	}
+
+	rl.rlim_cur = rl.rlim_max = rlim_value;
+	unixresult = setrlimit(unixresource, &rl);
+
+	if (unixresult == 0) {
+		return (ISC_R_SUCCESS);
+	}
+
+#if defined(OPEN_MAX) && defined(__APPLE__)
+	/*
+	 * The Darwin kernel doesn't accept RLIM_INFINITY for rlim_cur; the
+	 * maximum possible value is OPEN_MAX.  BIND8 used to use
+	 * sysconf(_SC_OPEN_MAX) for such a case, but this value is much
+	 * smaller than OPEN_MAX and is not really effective.
+	 */
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		rl.rlim_cur = OPEN_MAX;
+		unixresult = setrlimit(unixresource, &rl);
+		if (unixresult == 0) {
+			return (ISC_R_SUCCESS);
+		}
+	}
+#elif defined(__linux__)
+#ifndef NR_OPEN
+#define NR_OPEN (1024 * 1024)
+#endif /* ifndef NR_OPEN */
+
+	/*
+	 * Some Linux kernels don't accept RLIM_INFINIT; the maximum
+	 * possible value is the NR_OPEN defined in linux/fs.h.
+	 */
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		rl.rlim_cur = rl.rlim_max = NR_OPEN;
+		unixresult = setrlimit(unixresource, &rl);
+		if (unixresult == 0) {
+			return (ISC_R_SUCCESS);
+		}
+	}
+#endif /* if defined(OPEN_MAX) && defined(__APPLE__) */
+	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
+		if (getrlimit(unixresource, &rl) == 0) {
+			rl.rlim_cur = rl.rlim_max;
+			unixresult = setrlimit(unixresource, &rl);
+			if (unixresult == 0) {
+				return (ISC_R_SUCCESS);
+			}
+		}
+	}
+	return (isc__errno2result(errno));
+}
+
+isc_result_t
+isc_resource_getlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	int unixresource;
+	struct rlimit rl;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	if (getrlimit(unixresource, &rl) != 0) {
+		return (isc__errno2result(errno));
+	}
+
+	*value = rl.rlim_max;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_resource_getcurlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	int unixresource;
+	struct rlimit rl;
+	isc_result_t result;
+
+	result = resource2rlim(resource, &unixresource);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	if (getrlimit(unixresource, &rl) != 0) {
+		return (isc__errno2result(errno));
+	}
+
+	*value = rl.rlim_cur;
+	return (ISC_R_SUCCESS);
+}