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2b5fea833b
ftime is an obsolete variation on gettimeofday, offering only millisecond time resolution; it was probably a system call in ooold versions of BSD Unix. For historic reasons, we had three implementations of it. These are all consolidated into time/ftime.c, and then the function is deprecated. For some reason, the implementation of ftime in terms of gettimeofday was rounding rather than truncating microseconds to milliseconds. In all the other places where we use a higher-resolution time function to implement a lower-resolution one, we truncate. ftime is changed to match, just for tidiness' sake. Like gettimeofday, ftime tries to report the time zone, and using that information is always a bug. This patch dummies out the reported timezone information; the timezone and dstflag fields of the returned "struct timeb" will always be zero. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu, powerpc64-linux-gnu, and powerpc-linux-gnu. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Lukasz Majewski <lukma@denx.de>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/* Verify that ftime is sane.
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Copyright (C) 2014-2019 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/timeb.h>
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#include <stdio.h>
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#include <libc-diag.h>
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static int
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do_test (void)
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{
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struct timeb prev, curr = {.time = 0, .millitm = 0};
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int sec = 0;
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while (sec != 3)
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{
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prev = curr;
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/* ftime was deprecated on 2.31. */
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wdeprecated-declarations");
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if (ftime (&curr))
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{
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printf ("ftime returned an error\n");
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return 1;
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}
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DIAG_POP_NEEDS_COMMENT;
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if (curr.time < prev.time)
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{
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printf ("ftime's time flowed backwards\n");
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return 1;
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}
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if (curr.time == prev.time
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&& curr.millitm < prev.millitm)
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{
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printf ("ftime's millitm flowed backwards\n");
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return 1;
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}
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if (curr.time > prev.time)
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sec ++;
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}
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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