1#include <sys/socket.h>
2#include <limits.h>
3#include <time.h>
4#include <sys/time.h>
5#include <string.h>
6#include "syscall.h"
7
8hidden void __convert_scm_timestamps(struct msghdr *, socklen_t);
9
10void __convert_scm_timestamps(struct msghdr *msg, socklen_t csize)
11{
12 if (SCM_TIMESTAMP == SCM_TIMESTAMP_OLD) return;
13 if (!msg->msg_control || !msg->msg_controllen) return;
14
15 struct cmsghdr *cmsg, *last=0;
16 long tmp;
17 long long tvts[2];
18 int type = 0;
19
20 for (cmsg=CMSG_FIRSTHDR(msg); cmsg; cmsg=CMSG_NXTHDR(msg, cmsg)) {
21 if (cmsg->cmsg_level==SOL_SOCKET) switch (cmsg->cmsg_type) {
22 case SCM_TIMESTAMP_OLD:
23 if (type) break;
24 type = SCM_TIMESTAMP;
25 goto common;
26 case SCM_TIMESTAMPNS_OLD:
27 type = SCM_TIMESTAMPNS;
28 common:
29 memcpy(&tmp, CMSG_DATA(cmsg), sizeof tmp);
30 tvts[0] = tmp;
31 memcpy(&tmp, CMSG_DATA(cmsg) + sizeof tmp, sizeof tmp);
32 tvts[1] = tmp;
33 break;
34 }
35 last = cmsg;
36 }
37 if (!last || !type) return;
38 if (CMSG_SPACE(sizeof tvts) > csize-msg->msg_controllen) {
39 msg->msg_flags |= MSG_CTRUNC;
40 return;
41 }
42 msg->msg_controllen += CMSG_SPACE(sizeof tvts);
43 cmsg = CMSG_NXTHDR(msg, last);
44 cmsg->cmsg_level = SOL_SOCKET;
45 cmsg->cmsg_type = type;
46 cmsg->cmsg_len = CMSG_LEN(sizeof tvts);
47 memcpy(CMSG_DATA(cmsg), &tvts, sizeof tvts);
48}
49
50ssize_t recvmsg(int fd, struct msghdr *msg, int flags)
51{
52 ssize_t r;
53 socklen_t orig_controllen = msg->msg_controllen;
54#if LONG_MAX > INT_MAX
55 struct msghdr h, *orig = msg;
56 if (msg) {
57 h = *msg;
58 h.__pad1 = h.__pad2 = 0;
59 msg = &h;
60 }
61#endif
62 r = socketcall_cp(recvmsg, fd, msg, flags, 0, 0, 0);
63 if (r >= 0) __convert_scm_timestamps(msg, orig_controllen);
64#if LONG_MAX > INT_MAX
65 if (orig) *orig = h;
66#endif
67 return r;
68}