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67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/* common.c
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*
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* Common helper functions for testing SO_REUSEADDR behaviour
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*
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* Copyright Red Hat
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*/
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#include <errno.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <sys/socket.h>
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#include "common.h"
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int sock_reuseaddr(void)
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{
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int y = 1;
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int s;
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s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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if (s < 0)
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die("socket(): %s\n", strerror(errno));
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if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &y, sizeof(y)) , 0)
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die("SO_REUSEADDR: %s\n", strerror(errno));
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return s;
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}
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/* Send a token via the given connected socket */
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void send_token(int s, long token)
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{
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ssize_t rc;
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rc = send(s, &token, sizeof(token), 0);
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if (rc < 0)
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die("send(): %s\n", strerror(errno));
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if (rc < sizeof(token))
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die("short send()\n");
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}
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/* Attempt to receive a token via the given socket.
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*
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* Returns true if we received the token, false if we got an EAGAIN, dies in any
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* other case */
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bool recv_token(int s, long token)
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{
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ssize_t rc;
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long buf;
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rc = recv(s, &buf, sizeof(buf), MSG_DONTWAIT);
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if (rc < 0) {
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if (errno == EWOULDBLOCK)
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return false;
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die("recv(): %s\n", strerror(errno));
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}
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if (rc < sizeof(buf))
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die("short recv()\n");
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if (buf != token)
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die("data mismatch\n");
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return true;
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}
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