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13c51549e2
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>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/* Copyright (C) 2015-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/socket.h>
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#include <time.h>
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#include <sysdep.h>
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#include <socketcall.h>
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#include <socket-constants-time64.h>
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static int
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getsockopt_syscall (int fd, int level, int optname, void *optval,
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socklen_t *len)
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{
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#ifdef __ASSUME_GETSOCKOPT_SYSCALL
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return INLINE_SYSCALL (getsockopt, 5, fd, level, optname, optval, len);
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#else
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return SOCKETCALL (getsockopt, fd, level, optname, optval, len);
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#endif
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}
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#ifndef __ASSUME_TIME64_SYSCALLS
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static int
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getsockopt32 (int fd, int level, int optname, void *optval,
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socklen_t *len)
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{
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int r = -1;
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if (level != SOL_SOCKET)
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return r;
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switch (optname)
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{
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case COMPAT_SO_RCVTIMEO_NEW:
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case COMPAT_SO_SNDTIMEO_NEW:
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{
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if (optname == COMPAT_SO_RCVTIMEO_NEW)
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optname = COMPAT_SO_RCVTIMEO_OLD;
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if (optname == COMPAT_SO_SNDTIMEO_NEW)
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optname = COMPAT_SO_SNDTIMEO_OLD;
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struct __timeval32 tv32;
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r = getsockopt_syscall (fd, level, optname, &tv32,
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(socklen_t[]) { sizeof tv32 });
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if (r < 0)
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break;
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/* POSIX states that if the size of the option value is greater than
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then option length, the option value argument shall be silently
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truncated. */
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if (*len >= sizeof (struct __timeval64))
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{
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struct __timeval64 *tv64 = (struct __timeval64 *) optval;
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*tv64 = valid_timeval32_to_timeval64 (tv32);
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*len = sizeof (*tv64);
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}
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else
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memcpy (optval, &tv32, sizeof tv32);
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}
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break;
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case COMPAT_SO_TIMESTAMP_NEW:
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case COMPAT_SO_TIMESTAMPNS_NEW:
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{
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if (optname == COMPAT_SO_TIMESTAMP_NEW)
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optname = COMPAT_SO_TIMESTAMP_OLD;
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if (optname == COMPAT_SO_TIMESTAMPNS_NEW)
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optname = COMPAT_SO_TIMESTAMPNS_OLD;
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r = getsockopt_syscall (fd, level, optname, optval, len);
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}
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break;
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}
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return r;
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}
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#endif
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int
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__getsockopt (int fd, int level, int optname, void *optval, socklen_t *len)
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{
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int r = getsockopt_syscall (fd, level, optname, optval, len);
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#ifndef __ASSUME_TIME64_SYSCALLS
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if (r == -1 && errno == ENOPROTOOPT)
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r = getsockopt32 (fd, level, optname, optval, len);
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#endif
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return r;
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}
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weak_alias (__getsockopt, getsockopt)
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