31 lines
954 B
Plaintext
31 lines
954 B
Plaintext
@node stdout
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@subsection @code{stdout}
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@findex stdout
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/stdout.html}
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Gnulib module: ---
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Portability problems fixed by Gnulib:
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@itemize
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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stdout is created in 32-bit mode instead of 64-bit mode: Cygwin 1.5.x.
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One workaround is to use @code{freopen(NULL, "w", stdout)} on Cygwin 1.5.21
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or newer.
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@mindex ftello
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Another is to use the gnulib @code{ftello} module and do
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@code{ftello(stdout)}.
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@item
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POSIX states that a setuid application can guarantee that fd 1 is
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open, but some systems guarantee this even for non-setuid programs.
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If an application is executed with fd 1 closed, use of @code{stdout}
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can affect an unrelated file that happened to be assigned to fd 1.
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The gnulib @code{xstdopen} or the *-safer modules may be used to
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guarantee that fd 1 stays
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reserved for @code{stdout}.
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@end itemize
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