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manual: add dup3
Reviewed-by: Florian Weimer <fweimer@redhat.com>
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@ -3415,6 +3415,14 @@ middle of calling @code{dup2} at which @var{new} is closed and not yet a
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duplicate of @var{old}.
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@end deftypefun
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@deftypefun int dup3 (int @var{old}, int @var{new}, int @var{flags})
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@standards{Linux, unistd.h}
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@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
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This function is the same as @code{dup2} but creates the new
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descriptor as if it had been opened with flags @var{flags}. The only
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allowed flag is @code{O_CLOEXEC}.
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@end deftypefun
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@deftypevr Macro int F_DUPFD
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@standards{POSIX.1, fcntl.h}
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This macro is used as the @var{command} argument to @code{fcntl}, to
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