57 lines
2.2 KiB
Plaintext
57 lines
2.2 KiB
Plaintext
@node fopen
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@subsection @code{fopen}
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@findex fopen
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/fopen.html}
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Gnulib module: fopen or fopen-gnu
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@mindex fopen
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@mindex fopen-gnu
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Portability problems fixed by either Gnulib module @code{fopen} or @code{fopen-gnu}:
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@itemize
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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, AIX 7.1, Solaris 9.
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@item
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On platforms where @code{off_t} is a 32-bit type, @code{fopen} may not work
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correctly with files 2 GiB and larger. @xref{Large File Support}.
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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 fixed by Gnulib module @code{fopen-gnu}:
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@itemize
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@item
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This function does not support the mode character
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@samp{x} (corresponding to @code{O_EXCL}), introduced in ISO C11,
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on some platforms:
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FreeBSD 8.2, NetBSD 6.1, OpenBSD 5.6, Minix 3.2, AIX 6.1, HP-UX 11.31, Solaris 11.3, Cygwin 1.7.16 (2012), mingw, MSVC 14.
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@item
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This function does not support the mode character
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@samp{e} (corresponding to @code{O_CLOEXEC}),
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introduced into a future POSIX revision through
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@url{https://www.austingroupbugs.net/view.php?id=411}, on some platforms:
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glibc 2.6, macOS 14, FreeBSD 9.0, NetBSD 5.1, OpenBSD 5.6, Minix 3.2, AIX 7.2, HP-UX 11.31, Solaris 11.3, Cygwin 1.7.16 (2012), mingw, MSVC 14.
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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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On Windows, this function returns a file stream in ``text'' mode by default;
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this means that it translates @code{'\n'} to CR/LF by default. Use the
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@code{"b"} flag if you need reliable binary I/O.
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@item
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On Windows platforms (excluding Cygwin), this function fails to open
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directories for reading. Such streams have implementation-defined
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semantics on other platforms. To avoid directory streams with a
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consistent error message, use @code{fstat} after @code{open} and
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@code{fdopen}, rather than @code{fopen} and @code{fileno}.
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@end itemize
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