74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* This file is part of the Project Athena Zephyr Notification System.
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* It contains source for the ZOpenPort function.
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*
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* Created by: Robert French
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*
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* $Id$
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*
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* Copyright (c) 1987 by the Massachusetts Institute of Technology.
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* For copying and distribution information, see the file
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* "mit-copyright.h".
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*/
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#ifndef lint
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static const char rcsid_ZOpenPort_c[] = "$Id$";
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#endif
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#include <internal.h>
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#include <sys/socket.h>
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Code_t
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ZOpenPort(u_short *port)
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{
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struct sockaddr_in bindin;
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unsigned int len;
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int val = 1;
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(void) ZClosePort();
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if ((__Zephyr_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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__Zephyr_fd = -1;
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return errno;
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}
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bindin.sin_family = AF_INET;
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if (port && *port) {
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bindin.sin_port = *port;
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if (setsockopt(__Zephyr_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof val) < 0)
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return errno;
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} else {
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bindin.sin_port = 0;
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}
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bindin.sin_addr.s_addr = INADDR_ANY;
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if (bind(__Zephyr_fd, (struct sockaddr *)&bindin, sizeof(bindin)) < 0) {
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if (errno == EADDRINUSE && port && *port)
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return ZERR_PORTINUSE;
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else
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return errno;
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}
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if (port && *port) {
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/* turn SO_REUSEADDR back off so no one else can steal it */
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val = 0;
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if (setsockopt(__Zephyr_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof val) < 0)
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return errno;
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}
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if (!bindin.sin_port) {
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len = sizeof(bindin);
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if (getsockname(__Zephyr_fd, (struct sockaddr *)&bindin, &len))
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return errno;
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}
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__Zephyr_port = bindin.sin_port;
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__Zephyr_open = 1;
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if (port)
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*port = bindin.sin_port;
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return ZERR_NONE;
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}
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