65 lines
2.4 KiB
Plaintext
65 lines
2.4 KiB
Plaintext
@node stat
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@subsection @code{stat}
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@findex stat
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/stat.html}
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Gnulib module: stat
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@mindex stat
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Portability problems fixed by Gnulib:
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@itemize
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@item
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On platforms where @code{off_t} is a 32-bit type, @code{stat} may not correctly
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report the size of files or block devices 2 GiB and larger.
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@xref{Large File Support}.
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@item
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On Linux/x86 and Linux/x86_64, applications compiled in 32-bit mode cannot
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access files that happen to have a 64-bit inode number. This can occur with
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file systems such as XFS (typically on large disks) and NFS.
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@xref{Large File Support}.
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@item
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The @code{st_atime}, @code{st_ctime}, @code{st_mtime} fields are affected by
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the current time zone and by the DST flag of the current time zone on some
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platforms:
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mingw, MSVC 14 (when the environment variable @env{TZ} is set).
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@item
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On MSVC 14, this function fails with error @code{ENOENT}
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on files such as @samp{C:\pagefile.sys} and
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on directories such as @samp{C:\System Volume Information}.
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@item
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On some platforms, @code{stat("link-to-file/",buf)} succeeds instead
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of failing with @code{ENOTDIR}.
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macOS 14, FreeBSD 7.2, AIX 7.1, Solaris 9, mingw64.
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@item
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On some platforms, @code{stat(".",buf)} and @code{stat("./",buf)} give
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different results:
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mingw, MSVC 14.
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@item
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On macOS 12.6, when this function yields a timestamp with a
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nonpositive @code{tv_sec} value, @code{tv_nsec} might be in the range
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@minus{}999999999..@minus{}1, representing a negative nanoseconds
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offset from @code{tv_sec}. Solaris 11.4 is similar, except that
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@code{tv_sec} might also be @minus{}1000000000.
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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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@xref{sys/stat.h}, for general portability problems with @code{struct stat}.
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@item
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Cygwin's @code{stat} function sometimes sets @code{errno} to @code{EACCES} when
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@code{ENOENT} would be more appropriate.
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@item
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This function sets @code{st_ino} only to the low-order 32 bits of
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the inode number of a socket or pipe, which thus can disagree
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with the @code{st_ino} obtained by @code{fstat}:
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macOS 14.
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@item
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Because of the definition of @code{struct stat}, it is not possible to
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portably replace @code{stat} via an object-like macro. Therefore,
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expressions such as @code{(islnk ? lstat : stat) (name, buf)} are not
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portable, and should instead be written @code{islnk ? lstat (name,
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buf) : stat (name, buf)}.
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@end itemize
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