mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-05 11:11:04 +00:00
948ce73b31
The timestamps created by __convert_scm_timestamps only make sense for 64 bit time_t programs, 32 bit time_t programs will ignore 64 bit time_t timestamps since SO_TIMESTAMP will be defined to old values (either by glibc or kernel headers). Worse, if the buffer is not suffice MSG_CTRUNC is set to indicate it (which breaks some programs [1]). This patch makes only 64 bit time_t recvmsg and recvmmsg to call __convert_scm_timestamps. Also, the assumption to called it is changed from __ASSUME_TIME64_SYSCALLS to __TIMESIZE != 64 since the setsockopt might be called by libraries built without __TIME_BITS=64. The MSG_CTRUNC is only set for the 64 bit symbols, it should happen only if 64 bit time_t programs run older kernels. Checked on x86_64-linux-gnu and i686-linux-gnu. [1] https://github.com/systemd/systemd/pull/20567 Reviewed-by: Florian Weimer <fweimer@redhat.com>
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* Copyright (C) 2010-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/socket.h>
|
|
#include <sysdep.h>
|
|
#include <socketcall.h>
|
|
|
|
static int
|
|
recvmmsg_syscall (int fd, struct mmsghdr *vmessages, unsigned int vlen,
|
|
int flags, struct __timespec64 *timeout)
|
|
{
|
|
#ifndef __NR_recvmmsg_time64
|
|
# define __NR_recvmmsg_time64 __NR_recvmmsg
|
|
#endif
|
|
int r = SYSCALL_CANCEL (recvmmsg_time64, fd, vmessages, vlen, flags,
|
|
timeout);
|
|
#ifndef __ASSUME_TIME64_SYSCALLS
|
|
if (r >= 0 || errno != ENOSYS)
|
|
return r;
|
|
|
|
struct timespec ts32, *pts32 = NULL;
|
|
if (timeout != NULL)
|
|
{
|
|
if (! in_time_t_range (timeout->tv_sec))
|
|
{
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
ts32 = valid_timespec64_to_timespec (*timeout);
|
|
pts32 = &ts32;
|
|
}
|
|
|
|
# ifdef __ASSUME_RECVMMSG_SYSCALL
|
|
r = SYSCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, pts32);
|
|
# else
|
|
r = SOCKETCALL_CANCEL (recvmmsg, fd, vmessages, vlen, flags, pts32);
|
|
# endif
|
|
if (r >= 0)
|
|
{
|
|
if (timeout != NULL)
|
|
*timeout = valid_timespec_to_timespec64 (ts32);
|
|
}
|
|
#endif
|
|
return r;
|
|
}
|
|
|
|
int
|
|
__recvmmsg64 (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
|
|
struct __timespec64 *timeout)
|
|
{
|
|
#if __TIMESIZE != 64
|
|
socklen_t csize[IOV_MAX];
|
|
if (vlen > IOV_MAX)
|
|
vlen = IOV_MAX;
|
|
for (int i = 0; i < vlen; i++)
|
|
csize[i] = vmessages[i].msg_hdr.msg_controllen;
|
|
#endif
|
|
|
|
int r = recvmmsg_syscall (fd, vmessages, vlen, flags, timeout);
|
|
#if __TIMESIZE != 64
|
|
if (r > 0)
|
|
{
|
|
for (int i=0; i < r; i++)
|
|
__convert_scm_timestamps (&vmessages[i].msg_hdr, csize[i]);
|
|
}
|
|
#endif
|
|
return r;
|
|
}
|
|
#if __TIMESIZE != 64
|
|
libc_hidden_def (__recvmmsg64)
|
|
|
|
int
|
|
__recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags,
|
|
struct timespec *timeout)
|
|
{
|
|
struct __timespec64 ts64, *pts64 = NULL;
|
|
if (timeout != NULL)
|
|
{
|
|
ts64 = valid_timespec_to_timespec64 (*timeout);
|
|
pts64 = &ts64;
|
|
}
|
|
int r = recvmmsg_syscall (fd, vmessages, vlen, flags, pts64);
|
|
if (r >= 0 && timeout != NULL)
|
|
/* The remanining timeout will be always less the input TIMEOUT. */
|
|
*timeout = valid_timespec64_to_timespec (ts64);
|
|
return r;
|
|
}
|
|
#endif
|
|
weak_alias (__recvmmsg, recvmmsg)
|