/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
- * Permission to use, copy, modify, and/or 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.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
*
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
*/
#include <config.h>
return max_fds;
}
-/* Translates 'host_name', which may be a DNS name or an IP address, into a
- * numeric IP address in '*addr'. Returns 0 if successful, otherwise a
- * positive errno value. */
+/* Translates 'host_name', which must be a string representation of an IP
+ * address, into a numeric IP address in '*addr'. Returns 0 if successful,
+ * otherwise a positive errno value. */
int
lookup_ip(const char *host_name, struct in_addr *addr)
{
if (!inet_aton(host_name, addr)) {
- struct hostent *he = gethostbyname(host_name);
- if (he == NULL) {
- struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
- VLOG_ERR_RL(&rl, "gethostbyname(%s): %s", host_name,
- (h_errno == HOST_NOT_FOUND ? "host not found"
- : h_errno == TRY_AGAIN ? "try again"
- : h_errno == NO_RECOVERY ? "non-recoverable error"
- : h_errno == NO_ADDRESS ? "no address"
- : "unknown error"));
- return ENOENT;
- }
- addr->s_addr = *(uint32_t *) he->h_addr;
+ struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
+ VLOG_ERR_RL(&rl, "\"%s\" is not a valid IP address", host_name);
+ return ENOENT;
}
return 0;
}
: htonl(0)); /* ??? */
}
+/* Returns a readable and writable fd for /dev/null, if successful, otherwise
+ * a negative errno value. The caller must not close the returned fd (because
+ * the same fd will be handed out to subsequent callers). */
+int
+get_null_fd(void)
+{
+ static int null_fd = -1;
+ if (null_fd < 0) {
+ null_fd = open("/dev/null", O_RDWR);
+ if (null_fd < 0) {
+ int error = errno;
+ VLOG_ERR("could not open /dev/null: %s", strerror(error));
+ return -error;
+ }
+ }
+ return null_fd;
+}
+
int
read_fully(int fd, void *p_, size_t size, size_t *bytes_read)
{