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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZOpenPort function.
*
* Created by: Robert French
*
* $Source$
* $Author$
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
/* $Header$ */
#include <zephyr/mit-copyright.h>
#include <zephyr/zephyr_internal.h>
#include <sys/socket.h>
Code_t ZOpenPort(port)
u_short *port;
{
int retval;
struct sockaddr_in bindin;
(void) ZClosePort();
if ((__Zephyr_fd = socket(AF_INET,SOCK_DGRAM,0)) < 0) {
__Zephyr_fd = -1;
return (errno);
}
bindin.sin_family = AF_INET;
if (port && *port)
bindin.sin_port = *port;
else
/*NOSTRICT*/
bindin.sin_port = htons((u_short)((getpid()*8)&0xfff)+
(((int)random()>>4)&0xf)+1024);
bindin.sin_addr.s_addr = INADDR_ANY;
do {
if ((retval = bind(__Zephyr_fd,&bindin,sizeof(bindin))) < 0) {
if (errno == EADDRINUSE) {
if (port && *port)
return (ZERR_PORTINUSE);
else
/*NOSTRICT*/
bindin.sin_port = htons(ntohs(bindin.
sin_port)
+1);
}
else
return (errno);
}
} while (retval < 0 && (!port || !*port));
__Zephyr_port = bindin.sin_port;
__Zephyr_open = 1;
if (port)
*port = bindin.sin_port;
return (ZERR_NONE);
}
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