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view doc/posix-functions/stat.texi @ 12258:150adbe92b27
stat: detect FreeBSD bug
Like Solaris 9, FreeBSD 7.2 mistakenly allows stat("link-to-file/").
Unlike Solaris, it correctly forbids stat("file/"). A number of
interfaces are affected (such as utimes), but replacing stat is
enough to catch several by reusing the Solaris 9 fixes.
* m4/stat.m4 (gl_FUNC_STAT): Also detect FreeBSD bug with slash on
symlink.
* doc/posix-functions/stat.texi (stat): Document the bug.
* tests/test-stat.h (test_stat_func): Add argument.
* tests/test-stat.c (main): Adjust caller.
* tests/test-fstatat.c (main): Likewise.
* modules/stat-tests (Depends-on): Add stdbool, symlink.
Reported by Jim Meyering.
Signed-off-by: Eric Blake <ebb9@byu.net>
author | Eric Blake <ebb9@byu.net> |
---|---|
date | Sat, 07 Nov 2009 16:59:11 -0700 |
parents | eb6b9da995d7 |
children | af9512fc5d24 |
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@node stat @section @code{stat} @findex stat POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/stat.html} Gnulib module: stat Portability problems fixed by Gnulib: @itemize @item On some platforms, @code{stat("link-to-file/",buf)} succeeds instead of failing with @code{ENOTDIR}. FreeBSD 7.2, Solaris 9. @item On some platforms, @code{stat(".",buf)} and @code{stat("./",buf)} give different results: mingw. @end itemize Portability problems not fixed by Gnulib: @itemize @item On platforms where @code{off_t} is a 32-bit type, @code{stat} may not correctly report the size of files or block devices larger than 2 GB. The fix is to use the @code{AC_SYS_LARGEFILE} macro. @item Cygwin's @code{stat} function sometimes sets @code{errno} to @code{EACCES} when @code{ENOENT} would be more appropriate. @item On Windows platforms (excluding Cygwin), @code{st_ino} is always 0. @item Because of the definition of @code{struct stat}, it is not possible to portably replace @code{stat} via an object-like macro. Therefore, expressions such as @code{(islnk ? lstat : stat) (name, buf)} are not portable, and should instead be written @code{islnk ? lstat (name, buf) : stat (name, buf)}. @end itemize