When opening /proc/self/fd fails, current codes just return directly,
but we can fall back to close fds one by one.

Signed-off-by: Bin Meng <bmeng@tinylab.org>
---

(no changes since v1)

 util/async-teardown.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/util/async-teardown.c b/util/async-teardown.c
index 3ab19c8740..7e0177a8da 100644
--- a/util/async-teardown.c
+++ b/util/async-teardown.c
@@ -48,7 +48,11 @@ static void close_all_open_fd(void)
 
     dir = opendir("/proc/self/fd");
     if (!dir) {
-        /* If /proc is not mounted, there is nothing that can be done. */
+        /* If /proc is not mounted, close fds one by one. */
+        int open_max = sysconf(_SC_OPEN_MAX), i;
+        for (i = 0; i < open_max; i++) {
+                close(i);
+        }
         return;
     }
     /* Avoid closing the directory. */
-- 
2.34.1

On 6/16/23 17:27, Bin Meng wrote:
> When opening /proc/self/fd fails, current codes just return directly,
> but we can fall back to close fds one by one.
> 
> Signed-off-by: Bin Meng <bmeng@tinylab.org>
> ---
> 
> (no changes since v1)
> 
>   util/async-teardown.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/util/async-teardown.c b/util/async-teardown.c
> index 3ab19c8740..7e0177a8da 100644
> --- a/util/async-teardown.c
> +++ b/util/async-teardown.c
> @@ -48,7 +48,11 @@ static void close_all_open_fd(void)
>   
>       dir = opendir("/proc/self/fd");
>       if (!dir) {
> -        /* If /proc is not mounted, there is nothing that can be done. */
> +        /* If /proc is not mounted, close fds one by one. */
> +        int open_max = sysconf(_SC_OPEN_MAX), i;
> +        for (i = 0; i < open_max; i++) {
> +                close(i);
> +        }
>           return;
>       }
>       /* Avoid closing the directory. */

Do we really need to make the 1M close calls?
The process is on its way to exit anyway...


r~