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46 lines
990 B
C
46 lines
990 B
C
#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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char buf[CMSG_SPACE(sizeof(int))];
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};
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int64 io_receivefd(int64 sock) {
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struct iovec iov;
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struct msghdr msg;
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union fdmsg cmsg;
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struct cmsghdr* h;
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char x[100];
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char name[100];
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iov.iov_base=x;
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iov.iov_len=100;
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msg.msg_name=name;
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msg.msg_namelen=100;
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msg.msg_control=cmsg.buf;
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msg.msg_controllen=sizeof(union fdmsg);
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_flags=0;
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h=CMSG_FIRSTHDR(&msg);
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h->cmsg_len=CMSG_LEN(sizeof(int));
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h->cmsg_level=SOL_SOCKET;
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h->cmsg_type=SCM_RIGHTS;
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*((int*)CMSG_DATA(h))=-1;
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if (recvmsg(sock,&msg,0)==-1)
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return -1;
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h=CMSG_FIRSTHDR(&msg);
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if (!h || h->cmsg_len!=CMSG_LEN(sizeof(int)) || h->cmsg_level!=SOL_SOCKET || h->cmsg_type!=SCM_RIGHTS) {
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#ifdef EPROTO
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errno=EPROTO;
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#else
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errno=EINVAL;
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#endif
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return -1;
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}
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return *((int*)CMSG_DATA(h));
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}
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