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adjtimex.2: Add featute test macro requirements
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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.SH NAME
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adjtimex \- tune kernel clock
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.SH SYNOPSIS
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.nf
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.BR "#define _BSD_SOURCE" " /* See feature_test_macros(7) */"
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.B #include <sys/timex.h>
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.sp
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.BI "int adjtimex(struct timex *" "buf" );
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.fi
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.SH DESCRIPTION
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Linux uses David L. Mills' clock adjustment algorithm (see RFC\ 1305).
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The system call
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