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Commit 4a30a714 authored by Adhemerval Zanella's avatar Adhemerval Zanella
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linux: Add recvvmsg fallback for 64-bit time_t SO_TIMESTAMP{NS}



Handle the SO_TIMESTAMP{NS} similar to recvmsg: 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.

Also for !__ASSUME_TIME64_SYSCALLS it limits the maximum number of
'struct mmsghdr *' to IOV_MAX (and also increases the stack size
requirement to IOV_MAX times sizeof (socklen_t)).  The Linux imposes
a similar limit to sendmmsg, so bound the array size on recvmmsg is not
unreasonable.  And this will be used only on older when building with
32-bit time support.

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

Reviewed-by: default avatarLukasz Majewski <lukma@denx.de>
Reviewed-by: default avatarCarlos O'Donell <carlos@redhat.com>
Tested-by: default avatarCarlos O'Donell <carlos@redhat.com>
parent 13c51549
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