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util: move recv_fd and send_fd in a separate file

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It will be used in the parasite

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Andrey Vagin
2012-02-01 13:00:49 +03:00
committed by Cyrill Gorcunov
parent fd7c44dd86
commit 1465fade3b
4 changed files with 85 additions and 71 deletions
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68
util-net.c Normal file
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@@ -0,0 +1,68 @@
#include <sys/socket.h>
#include <sys/un.h>
#include "syscall.h"
int send_fd(int sock, struct sockaddr_un *saddr, int len, int fd)
{
struct msghdr hdr;
struct iovec data;
char cmsgbuf[CMSG_SPACE(sizeof(int))];
struct cmsghdr* cmsg;
int *cmsg_data;
char dummy = '*';
data.iov_base = &dummy;
data.iov_len = sizeof(dummy);
hdr.msg_name = (struct sockaddr *)saddr;
hdr.msg_namelen = len;
hdr.msg_iov = &data;
hdr.msg_iovlen = 1;
hdr.msg_flags = 0;
hdr.msg_control = &cmsgbuf;
hdr.msg_controllen = CMSG_LEN(sizeof(int));
cmsg = CMSG_FIRSTHDR(&hdr);
cmsg->cmsg_len = hdr.msg_controllen;
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg_data = (int *)CMSG_DATA(cmsg);
*cmsg_data = fd;
return sys_sendmsg(sock, &hdr, 0);
}
int recv_fd(int sock)
{
struct msghdr msg;
struct iovec iov;
char buf[1];
char ccmsg[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
int *cmsg_data;
iov.iov_base = buf;
iov.iov_len = 1;
int ret;
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = ccmsg;
msg.msg_controllen = sizeof(ccmsg);
ret = sys_recvmsg(sock, &msg, 0);
if (ret < 0)
return ret;
cmsg = CMSG_FIRSTHDR(&msg);
if (!cmsg->cmsg_type == SCM_RIGHTS)
return -2;
cmsg_data = (int *)CMSG_DATA(cmsg);
return *cmsg_data;
}