1 b3994ec5 2003-12-11 devnull #include <u.h>
 2 b3994ec5 2003-12-11 devnull #define NOPLAN9DEFINES
 3 b3994ec5 2003-12-11 devnull #include <libc.h>
 4 b3994ec5 2003-12-11 devnull #include <sys/socket.h>
 5 b3994ec5 2003-12-11 devnull #include <sys/uio.h>
 6 b3994ec5 2003-12-11 devnull #include <unistd.h>
 7 b3994ec5 2003-12-11 devnull #include <errno.h>
 8 b3994ec5 2003-12-11 devnull 
 9 b3994ec5 2003-12-11 devnull typedef struct Sendfd Sendfd;
10 b3994ec5 2003-12-11 devnull struct Sendfd {
11 b3994ec5 2003-12-11 devnull 	struct cmsghdr cmsg;
12 b3994ec5 2003-12-11 devnull 	int fd;
13 b3994ec5 2003-12-11 devnull };
14 b3994ec5 2003-12-11 devnull 
15 b3994ec5 2003-12-11 devnull int
16 b3994ec5 2003-12-11 devnull sendfd(int s, int fd)
17 b3994ec5 2003-12-11 devnull {
18 b3994ec5 2003-12-11 devnull 	char buf[1];
19 b3994ec5 2003-12-11 devnull 	struct iovec iov;
20 b3994ec5 2003-12-11 devnull 	struct msghdr msg;
21 b3994ec5 2003-12-11 devnull 	int n;
22 b3994ec5 2003-12-11 devnull 	Sendfd sfd;
23 b3994ec5 2003-12-11 devnull 
24 b3994ec5 2003-12-11 devnull 	buf[0] = 0;
25 b3994ec5 2003-12-11 devnull 	iov.iov_base = buf;
26 b3994ec5 2003-12-11 devnull 	iov.iov_len = 1;
27 b3994ec5 2003-12-11 devnull 
28 b3994ec5 2003-12-11 devnull 	memset(&msg, 0, sizeof msg);
29 b3994ec5 2003-12-11 devnull 	msg.msg_iov = &iov;
30 b3994ec5 2003-12-11 devnull 	msg.msg_iovlen = 1;
31 b3994ec5 2003-12-11 devnull 
32 b3994ec5 2003-12-11 devnull 	sfd.cmsg.cmsg_len = sizeof sfd;
33 b3994ec5 2003-12-11 devnull 	sfd.cmsg.cmsg_level = SOL_SOCKET;
34 b3994ec5 2003-12-11 devnull 	sfd.cmsg.cmsg_type = SCM_RIGHTS;
35 b3994ec5 2003-12-11 devnull 	sfd.fd = fd;
36 b3994ec5 2003-12-11 devnull 
37 8f314994 2004-03-02 devnull 	msg.msg_control = (caddr_t)&sfd;
38 b3994ec5 2003-12-11 devnull 	msg.msg_controllen = sizeof sfd;
39 b3994ec5 2003-12-11 devnull 
40 b3994ec5 2003-12-11 devnull 	if((n=sendmsg(s, &msg, 0)) != iov.iov_len)
41 b3994ec5 2003-12-11 devnull 		return -1;
42 b3994ec5 2003-12-11 devnull 	return 0;
43 b3994ec5 2003-12-11 devnull }
44 b3994ec5 2003-12-11 devnull 
45 b3994ec5 2003-12-11 devnull int
46 b3994ec5 2003-12-11 devnull recvfd(int s)
47 b3994ec5 2003-12-11 devnull {
48 b3994ec5 2003-12-11 devnull 	int n;
49 b3994ec5 2003-12-11 devnull 	char buf[1];
50 b3994ec5 2003-12-11 devnull 	struct iovec iov;
51 b3994ec5 2003-12-11 devnull 	struct msghdr msg;
52 b3994ec5 2003-12-11 devnull 	Sendfd sfd;
53 b3994ec5 2003-12-11 devnull 
54 b3994ec5 2003-12-11 devnull 	iov.iov_base = buf;
55 b3994ec5 2003-12-11 devnull 	iov.iov_len = 1;
56 b3994ec5 2003-12-11 devnull 
57 b3994ec5 2003-12-11 devnull 	memset(&msg, 0, sizeof msg);
58 b3994ec5 2003-12-11 devnull 	msg.msg_name = 0;
59 b3994ec5 2003-12-11 devnull 	msg.msg_namelen = 0;
60 b3994ec5 2003-12-11 devnull 	msg.msg_iov = &iov;
61 b3994ec5 2003-12-11 devnull 	msg.msg_iovlen = 1;
62 b3994ec5 2003-12-11 devnull 
63 b3994ec5 2003-12-11 devnull 	memset(&sfd, 0, sizeof sfd);
64 b3994ec5 2003-12-11 devnull 	sfd.fd = -1;
65 b3994ec5 2003-12-11 devnull 	sfd.cmsg.cmsg_len = sizeof sfd;
66 b3994ec5 2003-12-11 devnull 	sfd.cmsg.cmsg_level = SOL_SOCKET;
67 b3994ec5 2003-12-11 devnull 	sfd.cmsg.cmsg_type = SCM_RIGHTS;
68 b3994ec5 2003-12-11 devnull 
69 8f314994 2004-03-02 devnull 	msg.msg_control = (caddr_t)&sfd;
70 b3994ec5 2003-12-11 devnull 	msg.msg_controllen = sizeof sfd;
71 b3994ec5 2003-12-11 devnull 
72 b3994ec5 2003-12-11 devnull 	if((n=recvmsg(s, &msg, 0)) < 0)
73 b3994ec5 2003-12-11 devnull 		return -1;
74 b3994ec5 2003-12-11 devnull 	if(n==0 && sfd.fd==-1){
75 b3994ec5 2003-12-11 devnull 		werrstr("eof in recvfd");
76 b3994ec5 2003-12-11 devnull 		return -1;
77 b3994ec5 2003-12-11 devnull 	}
78 b3994ec5 2003-12-11 devnull 	return sfd.fd;
79 b3994ec5 2003-12-11 devnull }