linux-kernel - Re: [PATCH 2/2] dwarves: cus__load

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Date:   Wed, 16 Mar 2022 17:51:03 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     kkourt@...urt.io
Cc:     dwarves@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Kornilios Kourtis <kornilios@...valent.com>
Subject: Re: [PATCH 2/2] dwarves: cus__load_files: set errno if load fails

Em Wed, Mar 16, 2022 at 02:23:54PM +0100, kkourt@...urt.io escreveu:
> From: Kornilios Kourtis <kornilios@...valent.com>
> 
> This patch improves the error seen by the user by setting errno in
> cus__load_files(). Otherwise, we get a "No such file or directory" error
> which might be confusing.
> 
> Before the patch, using a bogus file:
> $ ./pahole -J ./vmlinux-5.3.18-24.102-default.debug
> pahole: ./vmlinux-5.3.18-24.102-default.debug: No such file or directory
> $ ls ./vmlinux-5.3.18-24.102-default.debug
> /home/kkourt/src/hubble-fgs/vmlinux-5.3.18-24.102-default.debug
> 
> After the patch:
> $ ./pahole -J ./vmlinux-5.3.18-24.102-default.debug
> pahole: ./vmlinux-5.3.18-24.102-default.debug: Unknown error -22
> 
> Which is not very helpful, but less confusing.

Humm, because you should've set errno to -err back in cus__load_files(),
with this on top of your two patches we should get the:

#define EINVAL          22      /* Invalid argument */


"Invalid argument" or so from getting.

diff --git a/dwarves.c b/dwarves.c
index 5d0b420f0110452e..89609e96c46747ce 100644
--- a/dwarves.c
+++ b/dwarves.c
@@ -2401,7 +2401,7 @@ int cus__load_files(struct cus *cus, struct conf_load *conf,
 	while (filenames[i] != NULL) {
 		int err = cus__load_file(cus, conf, filenames[i]);
 		if (err) {
-			errno = err;
+			errno = -err;
 			return -++i;
 		}
 		++i;



Agreed? I'll fix it up here and apply if so.

- Arnaldo
 
> Signed-off-by: Kornilios Kourtis <kornilios@...valent.com>
> ---
>  dwarves.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/dwarves.c b/dwarves.c
> index 89b58ef..5d0b420 100644
> --- a/dwarves.c
> +++ b/dwarves.c
> @@ -2399,8 +2399,11 @@ int cus__load_files(struct cus *cus, struct conf_load *conf,
>  	int i = 0;
>  
>  	while (filenames[i] != NULL) {
> -		if (cus__load_file(cus, conf, filenames[i]))
> +		int err = cus__load_file(cus, conf, filenames[i]);
> +		if (err) {
> +			errno = err;
>  			return -++i;
> +		}
>  		++i;
>  	}
>  
> -- 
> 2.25.1

-- 

- Arnaldo