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004f708a5e
* modules/freopen-safer: New module. * m4/stdio-safer.m4 (gl_FREOPEN_SAFER): New macro. * lib/freopen-safer.c (freopen_safer): New file. * lib/stdio-safer.h (freopen_safer): New declaration. * lib/stdio--.h (freopen): New override. * MODULES.html.sh (File stream based Input/Output): Mention it. * doc/posix-functions/freopen.texi (freopen): Mention pitfalls and freopen-safer module. * doc/posix-functions/stderr.texi (stderr): Likewise. * doc/posix-functions/stdin.texi (stdin): Likewise. * doc/posix-functions/stdout.texi (stdout): Likewise. * modules/freopen-safer-tests: New test. * tests/test-reopen-safer.c: New file. Signed-off-by: Eric Blake <ebb9@byu.net>
32 lines
973 B
Plaintext
32 lines
973 B
Plaintext
@node freopen
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@section @code{freopen}
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@findex freopen
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/freopen.html}
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Gnulib module: freopen
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Portability problems fixed by Gnulib:
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@itemize
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@item
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On Windows platforms (excluding Cygwin), this function does usually not
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recognize the @file{/dev/null} filename.
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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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On Windows platforms (excluding Cygwin), this function does not set @code{errno}
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upon failure.
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@item
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This function does not fail when the file name argument ends in a slash
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and (without the slash) names a nonexistent file or a file that is not a
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directory, on some platforms:
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HP-UX 11.00, Solaris 9, Irix 5.3.
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@item
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Applications should not assume that @code{fileno(f)} will be the same
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before and after a call to @code{freopen(name,mode,f)}. However, the
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module freopen-safer can at least protect @code{stdin}, @code{stdout},
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and @code{stderr}.
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@end itemize
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