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#include <u.h>
#define NOPLAN9DEFINES
#include <libc.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <unistd.h>
#include <errno.h>
typedef struct Sendfd Sendfd;
struct Sendfd {
struct cmsghdr cmsg;
int fd;
};
int
sendfd(int s, int fd)
{
char buf[1];
struct iovec iov;
struct msghdr msg;
int n;
Sendfd sfd;
buf[0] = 0;
iov.iov_base = buf;
iov.iov_len = 1;
memset(&msg, 0, sizeof msg);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
sfd.cmsg.cmsg_len = sizeof sfd;
sfd.cmsg.cmsg_level = SOL_SOCKET;
sfd.cmsg.cmsg_type = SCM_RIGHTS;
sfd.fd = fd;
msg.msg_control = (caddr_t)&sfd;
msg.msg_controllen = sizeof sfd;
if((n=sendmsg(s, &msg, 0)) != iov.iov_len)
return -1;
return 0;
}
int
recvfd(int s)
{
int n;
char buf[1];
struct iovec iov;
struct msghdr msg;
Sendfd sfd;
iov.iov_base = buf;
iov.iov_len = 1;
memset(&msg, 0, sizeof msg);
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
memset(&sfd, 0, sizeof sfd);
sfd.fd = -1;
sfd.cmsg.cmsg_len = sizeof sfd;
sfd.cmsg.cmsg_level = SOL_SOCKET;
sfd.cmsg.cmsg_type = SCM_RIGHTS;
msg.msg_control = (caddr_t)&sfd;
msg.msg_controllen = sizeof sfd;
if((n=recvmsg(s, &msg, 0)) < 0)
return -1;
if(n==0 && sfd.fd==-1){
werrstr("eof in recvfd");
return -1;
}
return sfd.fd;
}
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