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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include "io_internal.h"
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union fdmsg {
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struct cmsghdr h;
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/* on NetBSD, CMSG_SPACE is not constant */
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/* char buf[CMSG_SPACE(sizeof(int))]; */
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char buf[1000];
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};
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int io_passfd(int64 sock,int64 fd) {
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struct msghdr msg = {0};
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struct cmsghdr *cmsg;
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struct iovec iov;
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char buf[CMSG_SPACE(sizeof(int))];
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iov.iov_len=1;
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iov.iov_base="x";
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msg.msg_control = buf;
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msg.msg_controllen = sizeof buf;
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msg.msg_iov=&iov;
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msg.msg_iovlen=1;
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msg.msg_name=0;
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msg.msg_namelen=0;
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int));
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*((int*)CMSG_DATA(cmsg))=fd;
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msg.msg_controllen = cmsg->cmsg_len;
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return sendmsg(sock,&msg,0);
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}
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