[PATCH] linux: Implement tmpfile with O_TMPFILE (BZ#21530)

[Dmitry V. Levin]

On Thu, Aug 31, 2017 at 05:34:16PM -0300, Adhemerval Zanella wrote:
> This patch adds support to use O_TMPFILE on tmpfile on Linux.  This is

... adds O_TMPFILE support to tmpfile on Linux.

> similar previous suggestion by Andreas Schwab [1] with the difference

similar to the previous ... with the difference that

> the file descriptor creation is parameterized to compartmentalize Linux
> only open flags (O_TMPFILE) on sysdep folder.

... into sysdeps.

[...]
> diff --git a/stdio-common/tmpfile.c b/stdio-common/tmpfile.c
> index e6030be..3e35345 100644
> --- a/stdio-common/tmpfile.c
> +++ b/stdio-common/tmpfile.c
> @@ -34,23 +34,34 @@
>  FILE *
>  tmpfile (void)
>  {
> -  char buf[FILENAME_MAX];
>    int fd;
>    FILE *f;
> -
> -  if (__path_search (buf, FILENAME_MAX, NULL, "tmpf", 0))
> -    return NULL;
>    int flags = 0;
>  #ifdef FLAGS
>    flags = FLAGS;
>  #endif
> -  fd = __gen_tempname (buf, 0, flags, __GT_FILE);
> +
> +  /* First try a system specific method.  */
> +  fd = __gen_tempfd (flags);
> +
>    if (fd < 0)
> -    return NULL;
> +    {
> +      char buf[FILENAME_MAX];
>  
> -  /* Note that this relies on the Unix semantics that
> -     a file is not really removed until it is closed.  */
> -  (void) __unlink (buf);
> +      if (__path_search (buf, sizeof buf, NULL, "tmpf", 0))
> +	return NULL;
> +
> +      fd = __gen_tempname (buf, 0, flags, __GT_FILE);
> +      if (fd < 0)
> +	return NULL;
> +
> +      /* Note that this relies on the Unix semantics that
> +	 a file is not really removed until it is closed.  */
> +      (void) __unlink (buf);
> +    }
> +
> +  if (fd < 0)
> +    return NULL;

The last "if (fd < 0)" check is redundant.


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