blob: bdf3709db6dff84d665dc36d29cc06e394c105f0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* 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)
int *port;
{
int retval;
struct sockaddr_in bindin;
ZClosePort();
if ((__Zephyr_fd = socket(AF_INET,SOCK_DGRAM,0)) < 0) {
__Zephyr_fd = -1;
return (ZERR_UNIX);
}
bindin.sin_family = AF_INET;
if (port && *port)
bindin.sin_port = htons(*port);
else
bindin.sin_port = htons(((getpid()*8)&0xfff)+
((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)
return (ZERR_PORTINUSE);
else
bindin.sin_port = htons(ntohs(bindin.
sin_port)
+1);
}
else
return (ZERR_UNIX);
}
} while (retval < 0 && port);
__Zephyr_port = ntohs(bindin.sin_port);
if (port)
*port = ntohs(bindin.sin_port);
return (ZERR_NONE);
}
|