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b947d0524d
Work around glibc bug#15589, where freopen mishandles the case where stdin etc. are already closed. * doc/posix-functions/freopen.texi (freopen): Document the bug. * lib/freopen.c (_GL_ALREADY_INCLUDING_STDIO_H): Define this instead of __need_FILE, as the latter does not work with glibc. Include <fcntl.h>, for open flags. (rpl_freopen): Work around glibc bug. * m4/freopen.m4 (gl_FUNC_FREOPEN): Check for bug. * modules/freopen (Depends-on): Add fcntl-h. * tests/test-freopen.c (main): Test for bug.
43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
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 some platforms, if @code{stream} does not already have an open
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file descriptor, @code{freopen} returns the stream without opening
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the file: glibc 2.24.
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@item
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On platforms where @code{off_t} is a 32-bit type, @code{freopen} may not work
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correctly with files larger than 2 GB. (Cf. @code{AC_SYS_LARGEFILE}.)
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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 support a @code{NULL} file name argument on some
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platforms:
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OpenBSD 4.9, AIX 7.1, HP-UX 11.23, IRIX 6.5, OSF/1 5.1, Solaris 10, mingw, MSVC 9.
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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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