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/* See LICENSE file for copyright and license details. */
#include "libsimple.h"
ssize_t
libsimple_recvfrom_timestamped(int fd, void *restrict buf, size_t n, int flags, struct sockaddr *restrict addr,
socklen_t addrlen, struct timespec *restrict ts)
{
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
char cms[CMSG_SPACE(sizeof(*ts))];
size_t r;
iov.iov_base = buf;
iov.iov_len = n;
memset(&msg, 0, sizeof(msg));
msg.msg_name = addr;
msg.msg_namelen = addrlen;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (caddr_t)cms;
msg.msg_controllen = sizeof(cms);
switch ((r = recvmsg(fd, &msg, flags))) {
case -1:
return -1;
case 0:
errno = ECONNRESET;
return -1;
default:
break;
}
if (!ts)
return r;
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg &&
cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_TIMESTAMPNS &&
cmsg->cmsg_len == CMSG_LEN(sizeof(*ts))) {
memcpy(ts, CMSG_DATA(cmsg), sizeof(*ts));
} else if (cmsg &&
cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_TIMESTAMP &&
cmsg->cmsg_len == CMSG_LEN(sizeof(*ts))) {
memcpy(ts, CMSG_DATA(cmsg), sizeof(*ts));
ts->tv_nsec *= 1000;
} else {
memset(ts, 0, sizeof(*ts));
}
return r;
}
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