Re: [RFC PATCH v2 1/7] misc: Convert daemon () to GNU coding style

[Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>]

On 19/04/23 13:02, Sergey Bugaev wrote:
> This is nicer, and is going to be required for the following changes
> to reasonably stay within the 79 column limit.
> 
> No functional change.
> 
> Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>

LGTM, thanks.  I can be installed independently.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>  misc/daemon.c | 88 ++++++++++++++++++++++++++++-----------------------
>  1 file changed, 49 insertions(+), 39 deletions(-)
> 
> diff --git a/misc/daemon.c b/misc/daemon.c
> index 3c73ac2a..14577e40 100644
> --- a/misc/daemon.c
> +++ b/misc/daemon.c
> @@ -43,50 +43,60 @@ static char sccsid[] = "@(#)daemon.c	8.1 (Berkeley) 6/4/93";
>  int
>  daemon (int nochdir, int noclose)
>  {
> -	int fd;
> +  int fd;
>  
> -	switch (__fork()) {
> -	case -1:
> -		return (-1);
> -	case 0:
> -		break;
> -	default:
> -		_exit(0);
> -	}
> +  switch (__fork ())
> +    {
> +    case -1:
> +      return -1;
>  
> -	if (__setsid() == -1)
> -		return (-1);
> +    case 0:
> +      break;
>  
> -	if (!nochdir)
> -		(void)__chdir("/");
> +    default:
> +      _exit (0);
> +    }
>  
> -	if (!noclose) {
> -		struct __stat64_t64 st;
> +  if (__setsid () == -1)
> +    return -1;
>  
> -		if ((fd = __open_nocancel(_PATH_DEVNULL, O_RDWR, 0)) != -1
> -		    && __glibc_likely (__fstat64_time64 (fd, &st) == 0)) {
> -			if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0
> +  if (!nochdir)
> +    (void) __chdir ("/");
> +
> +  if (!noclose)
> +    {
> +      struct __stat64_t64 st;
> +
> +      fd = __open_nocancel (_PATH_DEVNULL, O_RDWR, 0);
> +      if (fd != -1 && __glibc_likely (__fstat64_time64 (fd, &st) == 0))
> +        {
> +          if (__builtin_expect (S_ISCHR (st.st_mode), 1) != 0
>  #if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
> -			    && (st.st_rdev
> -				== makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR))
> +              && (st.st_rdev == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR))
>  #endif
> -			    ) {
> -				(void)__dup2(fd, STDIN_FILENO);
> -				(void)__dup2(fd, STDOUT_FILENO);
> -				(void)__dup2(fd, STDERR_FILENO);
> -				if (fd > 2)
> -					(void)__close (fd);
> -			} else {
> -				/* We must set an errno value since no
> -				   function call actually failed.  */
> -				__close_nocancel_nostatus (fd);
> -				__set_errno (ENODEV);
> -				return -1;
> -			}
> -		} else {
> -			__close_nocancel_nostatus (fd);
> -			return -1;
> -		}
> -	}
> -	return (0);
> +             )
> +            {
> +              (void) __dup2 (fd, STDIN_FILENO);
> +              (void) __dup2 (fd, STDOUT_FILENO);
> +              (void) __dup2 (fd, STDERR_FILENO);
> +              if (fd > 2)
> +                (void) __close (fd);
> +            }
> +          else
> +            {
> +              /* We must set an errno value since no function call
> +                 actually failed.  */
> +              __close_nocancel_nostatus (fd);
> +              __set_errno (ENODEV);
> +              return -1;
> +            }
> +        }
> +      else
> +        {
> +          __close_nocancel_nostatus (fd);
> +          return -1;
> +        }
> +    }
> +
> +  return 0;
>  }