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linux: Only use 64-bit syscall if required for mq_timedreceive
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
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@ -68,7 +68,8 @@ tests := tst-shm tst-timer tst-timer2 \
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tst-mqueue5 tst-mqueue6 tst-mqueue7 tst-mqueue8 tst-mqueue9 \
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tst-timer3 tst-timer4 tst-timer5 \
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tst-cpuclock2 tst-cputimer1 tst-cputimer2 tst-cputimer3 \
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tst-shm-cancel
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tst-shm-cancel \
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tst-mqueue10
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tests-internal := tst-timer-sigmask
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tests-time64 := \
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@ -78,6 +79,7 @@ tests-time64 := \
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tst-mqueue2-time64 \
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tst-mqueue4-time64 \
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tst-mqueue8-time64 \
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tst-mqueue10-time64 \
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tst-timer4-time64
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extra-libs := librt
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1
rt/tst-mqueue10-time64.c
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1
rt/tst-mqueue10-time64.c
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@ -0,0 +1 @@
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#include "tst-mqueue10.c"
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62
rt/tst-mqueue10.c
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62
rt/tst-mqueue10.c
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@ -0,0 +1,62 @@
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/* Check for large timeout with mq_timedsend and mq_timedreceive.
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Copyright (C) 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 <errno.h>
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#include <intprops.h>
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#include <mqueue.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <unistd.h>
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static char name[sizeof "/tst-mqueue2-" + INT_BUFSIZE_BOUND (pid_t)];
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static void
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do_cleanup (void)
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{
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mq_unlink (name);
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}
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#define CLEANUP_HANDLER do_cleanup
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static int
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do_test (void)
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{
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snprintf (name, sizeof (name), "/tst-mqueue2-%u", getpid ());
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char msg[8] = { 0x55 };
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struct mq_attr attr = { .mq_maxmsg = 1, .mq_msgsize = sizeof (msg) };
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mqd_t q = mq_open (name, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
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TEST_VERIFY_EXIT (q != (mqd_t) -1);
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struct timespec ts = { TYPE_MAXIMUM (time_t), 0 };
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{
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timer_t timer = support_create_timer (0, 100000000, false, NULL);
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TEST_COMPARE (mq_timedreceive (q, msg, sizeof (msg), NULL, &ts), -1);
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TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
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support_delete_timer (timer);
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}
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mq_unlink (name);
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return 0;
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}
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#include <support/test-driver.c>
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@ -29,30 +29,33 @@ __mq_timedreceive_time64 (mqd_t mqdes, char *__restrict msg_ptr, size_t msg_len,
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#ifndef __NR_mq_timedreceive_time64
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# define __NR_mq_timedreceive_time64 __NR_mq_timedreceive
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#endif
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int ret = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
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msg_prio, abs_timeout);
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#ifndef __ASSUME_TIME64_SYSCALLS
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if (ret == 0 || errno != ENOSYS)
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return ret;
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struct timespec ts32;
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if (abs_timeout != NULL)
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#ifdef __ASSUME_TIME64_SYSCALLS
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return SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
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msg_prio, abs_timeout);
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#else
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bool need_time64 = abs_timeout != NULL
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&& !in_time_t_range (abs_timeout->tv_sec);
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if (need_time64)
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{
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if (! in_time_t_range (abs_timeout->tv_sec))
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{
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__set_errno (EOVERFLOW);
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return -1;
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}
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ts32 = valid_timespec64_to_timespec (*abs_timeout);
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int r = SYSCALL_CANCEL (mq_timedreceive_time64, mqdes, msg_ptr, msg_len,
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msg_prio, abs_timeout);
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if (r == 0 || errno != ENOSYS)
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return r;
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__set_errno (EOVERFLOW);
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return -1;
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}
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ret = SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio,
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abs_timeout != NULL ? &ts32 : NULL);
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#endif
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struct timespec ts32, *pts32 = NULL;
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if (abs_timeout != NULL)
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{
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ts32 = valid_timespec64_to_timespec (*abs_timeout);
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pts32 = &ts32;
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}
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return ret;
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return SYSCALL_CANCEL (mq_timedreceive, mqdes, msg_ptr, msg_len, msg_prio,
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pts32);
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#endif
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}
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#if __TIMESIZE != 64
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