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manual: Improve documentation of get_current_dir_name. [BZ #6889]

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This is a minor rewording to clarify the behaviour of
get_current_dir_name.  Additionally, the @vindex is moved above the
@deftypefun so that following links give a better result with regard
to context.

	[BZ #6889]
	* manual/filesys.texi (get_current_dir_name): Clarify
	behaviour.
This commit is contained in:
Rical Jasan 2018-02-16 08:47:20 -08:00
parent f8d7958289
commit 7d15ef84f5
2 changed files with 14 additions and 8 deletions
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@ -1,3 +1,8 @@
2018-02-19 Rical Jasan <ricaljasan@pacific.net>
[BZ #6889]
* manual/filesys.texi (get_current_dir_name): Clarify behaviour.
2018-02-18 Aurelien Jarno <aurelien@aurel32.net>
[BZ #22818]

17
manual/filesys.texi
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@ -147,19 +147,20 @@ necessarily enough space to contain the directory name. That is why
this function is deprecated.
@end deftypefn
@vindex PWD
@deftypefun {char *} get_current_dir_name (void)
@standards{GNU, unistd.h}
@safety{@prelim{}@mtsafe{@mtsenv{}}@asunsafe{@ascuheap{}}@acunsafe{@acsmem{} @acsfd{}}}
@c Besides getcwd, which this function calls as a fallback, it calls
@c getenv, with the potential thread-safety issues that brings about.
@vindex PWD
This @code{get_current_dir_name} function is basically equivalent to
@w{@code{getcwd (NULL, 0)}}. The only difference is that the value of
the @code{PWD} variable is returned if this value is correct. This is a
subtle difference which is visible if the path described by the
@code{PWD} value is using one or more symbol links in which case the
value returned by @code{getcwd} can resolve the symbol links and
therefore yield a different result.
The @code{get_current_dir_name} function is basically equivalent to
@w{@code{getcwd (NULL, 0)}}, except the value of the @env{PWD}
environment variable is first examined, and if it does in fact
correspond to the current directory, that value is returned. This is
a subtle difference which is visible if the path described by the
value in @env{PWD} is using one or more symbolic links, in which case
the value returned by @code{getcwd} would resolve the symbolic links
and therefore yield a different result.
This function is a GNU extension.
@end deftypefun