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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2020-09-07 17:08:46 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2021-06-15 10:42:06 -0300
commit13c51549e2077f2f3bf84e8fd0b46d8b0c615912 (patch)
treeb62046c46909d85fcd8a4cf815da4cf3c94ab337 /include/sys
parent8dfb169c80b56cf25494d052ddf410dc55f2f5a3 (diff)
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linux: Add fallback for 64-bit time_t SO_TIMESTAMP{NS}
The recvmsg handling is more complicated because it requires check the
returned kernel control message and make some convertions.  For
!__ASSUME_TIME64_SYSCALLS it converts the first 32-bit time SO_TIMESTAMP
or SO_TIMESTAMPNS and appends it to the control buffer if has extra
space or returns MSG_CTRUNC otherwise.  The 32-bit time field is kept
as-is.

Calls with __TIMESIZE=32 will see the converted 64-bit time control
messages as spurious control message of unknown type.  Calls with
__TIMESIZE=64 running on pre-time64 kernels will see the original
message as a spurious control ones of unknown typ while running on
kernel with native 64-bit time support will only see the time64 version
of the control message.

Checked on x86_64-linux-gnu and i686-linux-gnu (on 5.4 and on 4.15
kernel).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'include/sys')
-rw-r--r--include/sys/socket.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/sys/socket.h b/include/sys/socket.h
index 0e39dd2a3a..38a1f76b3b 100644
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -164,5 +164,10 @@ libc_hidden_proto (__libc_sa_len)
 
 libc_hidden_proto (__cmsg_nxthdr)
 
+#ifndef __ASSUME_TIME64_SYSCALLS
+extern void __convert_scm_timestamps (struct msghdr *msg, socklen_t msgsize)
+     attribute_hidden;
+#endif
+
 #endif
 #endif