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Bruno Haible
c36a0f21b3
* doc/Makefile (undocumented-modules.texi): New rule. (%.info, %.html, %.dvi, %.pdf): Depend on undocumented-modules.texi. (mostlyclean): Remove also *.m and *.tmp. (force): New rule. * doc/*.texi: Add module index entries. * doc/*/*.texi: Likewise.
56 lines
1.9 KiB
Plaintext
56 lines
1.9 KiB
Plaintext
@node access
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@subsection @code{access}
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@findex access
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POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/access.html}
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Gnulib module: access
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@mindex access
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function does not support the @code{X_OK} mode on some platforms:
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MSVC 14.
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@item
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This function does not reject trailing slashes on symlinks to non-directories
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on some platforms:
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Mac OS X 10.5.
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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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This function uses the effective id instead of the real id on some
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platforms:
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Cygwin 1.5.x.
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@end itemize
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Other problems of this function:
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@itemize
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@item
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There is an inherent race between calling this function and performing
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some action based on the results; you should think twice before trusting
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this function, especially in a set-uid or set-gid program.
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@item
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This function does not have an option for not following symbolic links
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(like @code{stat} versus @code{lstat}). If you need this option, use
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the Gnulib module @code{faccessat} with the @code{AT_EACCESS} flag.
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@item
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On Solaris, for the root user, any file is @code{X_OK} even if the file
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does not have the @code{x} permission bit set.
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@item
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On native Windows, files whose basename does not contain a @samp{.}
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cannot be executed through @code{execlp} or @code{execvp}. Nevertheless,
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this function may return true for such files.
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@item
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On Windows, different facilities for executing a program have different
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ways of finding an executable file, by trying various suffixes. For
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example, @code{execlp} and @code{execvp} search for files with the
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suffixes @code{.com}, @code{.exe}, @code{.bat}, @code{.cmd}, when the
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file with the given file name does not exist. Whereas @code{cmd.exe}
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searches according to the @code{PATHEXT} environment variable. This
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function does not perform any search; it merely looks at the file with
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the given file name.
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@end itemize
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