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libowfat/io/io_passfd.c

43 lines
971 B

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