Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <errno.h>
#include "io_internal.h"
union fdmsg {
struct cmsghdr h;
char buf[CMSG_SPACE(sizeof(int))];
};
int64 io_receivefd(int64 sock) {
struct iovec iov;
struct msghdr msg;
union fdmsg cmsg;
struct cmsghdr* h;
char x[100];
char name[100];
iov.iov_base=x;
iov.iov_len=100;
msg.msg_name=name;
msg.msg_namelen=100;
msg.msg_control=cmsg.buf;
msg.msg_controllen=sizeof(union fdmsg);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags=0;
h=CMSG_FIRSTHDR(&msg);
h->cmsg_len=CMSG_LEN(sizeof(int));
h->cmsg_level=SOL_SOCKET;
h->cmsg_type=SCM_RIGHTS;
*((int*)CMSG_DATA(h))=-1;
if (recvmsg(sock,&msg,0)==-1)
return -1;
h=CMSG_FIRSTHDR(&msg);
if (!h || h->cmsg_len!=CMSG_LEN(sizeof(int)) || h->cmsg_level!=SOL_SOCKET || h->cmsg_type!=SCM_RIGHTS) {
#ifdef EPROTO
errno=EPROTO;
#else
errno=EINVAL;
#endif
return -1;
}
return *((int*)CMSG_DATA(h));
}