mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-24 02:47:32 +00:00
1465fade3b
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>
69 lines
1.3 KiB
C
69 lines
1.3 KiB
C
#include <sys/socket.h>
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#include <sys/un.h>
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#include "syscall.h"
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int send_fd(int sock, struct sockaddr_un *saddr, int len, int fd)
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{
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struct msghdr hdr;
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struct iovec data;
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char cmsgbuf[CMSG_SPACE(sizeof(int))];
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struct cmsghdr* cmsg;
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int *cmsg_data;
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char dummy = '*';
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data.iov_base = &dummy;
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data.iov_len = sizeof(dummy);
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hdr.msg_name = (struct sockaddr *)saddr;
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hdr.msg_namelen = len;
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hdr.msg_iov = &data;
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hdr.msg_iovlen = 1;
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hdr.msg_flags = 0;
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hdr.msg_control = &cmsgbuf;
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hdr.msg_controllen = CMSG_LEN(sizeof(int));
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cmsg = CMSG_FIRSTHDR(&hdr);
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cmsg->cmsg_len = hdr.msg_controllen;
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg_data = (int *)CMSG_DATA(cmsg);
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*cmsg_data = fd;
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return sys_sendmsg(sock, &hdr, 0);
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}
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int recv_fd(int sock)
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{
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struct msghdr msg;
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struct iovec iov;
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char buf[1];
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char ccmsg[CMSG_SPACE(sizeof(int))];
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struct cmsghdr *cmsg;
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int *cmsg_data;
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iov.iov_base = buf;
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iov.iov_len = 1;
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int ret;
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msg.msg_name = 0;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = ccmsg;
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msg.msg_controllen = sizeof(ccmsg);
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ret = sys_recvmsg(sock, &msg, 0);
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if (ret < 0)
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return ret;
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cmsg = CMSG_FIRSTHDR(&msg);
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if (!cmsg->cmsg_type == SCM_RIGHTS)
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return -2;
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cmsg_data = (int *)CMSG_DATA(cmsg);
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return *cmsg_data;
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}
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