Re: [PATCH 4/5] linux-user: Add strace support for printing arguments of chown()/lchown()

[Laurent Vivier <laurent@vivier.eu>]

Le 02/06/2020 à 13:53, Filip Bozuta a écrit :
> From: Filip Bozuta <Filip.Bozuta@syrmia.com>
> 
> This patch implements strace argument printing functionality for syscalls:
> 
>     *chown, lchown - change ownership of a file
> 
>         int chown(const char *pathname, uid_t owner, gid_t group)
>         int lchown(const char *pathname, uid_t owner, gid_t group)
>         man page: https://www.man7.org/linux/man-pages/man2/lchown.2.html
> 
> Implementation notes:
> 
>     Both syscalls use strings as arguments and thus a separate
>     printing function was stated in "strace.list" for them.
>     Both syscalls share the same number and types of arguments
>     and thus share a same definition in file "syscall.c".
>     This defintion uses existing functions "print_string()" to
>     print the string argument and "print_raw_param()" to print
>     other two arguments that are of basic types.
> 
> Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
> ---
>  linux-user/strace.c    | 15 +++++++++++++++
>  linux-user/strace.list |  4 ++--
>  2 files changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/linux-user/strace.c b/linux-user/strace.c
> index b7f012f1b5..542bfdeb91 100644
> --- a/linux-user/strace.c
> +++ b/linux-user/strace.c
> @@ -1414,6 +1414,21 @@ print_chmod(const struct syscallname *name,
>  }
>  #endif
>  
> +#if defined(TARGET_NR_chown) || defined(TARGET_NR_lchown)
> +static void
> +print_chown(const struct syscallname *name,
> +    abi_long arg0, abi_long arg1, abi_long arg2,
> +    abi_long arg3, abi_long arg4, abi_long arg5)
> +{
> +    print_syscall_prologue(name);
> +    print_string(arg0, 0);
> +    print_raw_param("%d", arg1, 0);
> +    print_raw_param("%d", arg2, 1);
> +    print_syscall_epilogue(name);
> +}
> +#define print_lchown     print_chown
> +#endif
> +
>  #ifdef TARGET_NR_clock_adjtime
>  static void
>  print_clock_adjtime(const struct syscallname *name,
> diff --git a/linux-user/strace.list b/linux-user/strace.list
> index 5a56212532..b72f757d3f 100644
> --- a/linux-user/strace.list
> +++ b/linux-user/strace.list
> @@ -71,7 +71,7 @@
>  { TARGET_NR_chmod, "chmod" , NULL, print_chmod, NULL },
>  #endif
>  #ifdef TARGET_NR_chown
> -{ TARGET_NR_chown, "chown" , NULL, NULL, NULL },
> +{ TARGET_NR_chown, "chown" , NULL, print_chown, NULL },
>  #endif
>  #ifdef TARGET_NR_chown32
>  { TARGET_NR_chown32, "chown32" , NULL, NULL, NULL },
> @@ -474,7 +474,7 @@
>  { TARGET_NR_kill, "kill", NULL, print_kill, NULL },
>  #endif
>  #ifdef TARGET_NR_lchown
> -{ TARGET_NR_lchown, "lchown" , NULL, NULL, NULL },
> +{ TARGET_NR_lchown, "lchown" , NULL, print_lchown, NULL },
>  #endif
>  #ifdef TARGET_NR_lchown32
>  { TARGET_NR_lchown32, "lchown32" , NULL, NULL, NULL },
> 

Reviewed-by: Laurent Vivier <laurent@vivier.eu>