Re: [PATCH v2 4/6] linux-user: Add strace support for printing arguments of lseek()

[Laurent Vivier]

Le 08/06/2020 à 18:43, Filip Bozuta a écrit :
> From: Filip Bozuta <Filip.Bozuta@syrmia.com>
> 
> This patch implements strace argument printing functionality for syscall:
> 
>     *lseek - reposition read/write file offset
> 
>          off_t lseek(int fd, off_t offset, int whence)
>          man page: https://www.man7.org/linux/man-pages/man2/lseek.2.html
> 
> Implementation notes:
> 
>     The syscall's third argument "whence" has predefined values:
>     "SEEK_SET","SEEK_CUR","SEEK_END","SEEK_DATA","SEEK_HOLE"
>     and thus a separate printing function "print_lseek" was stated
>     in file "strace.list". This function is defined in "strace.c"
>     by using an existing function "print_raw_param()" to print
>     the first and second argument and a switch(case) statement
>     for the predefined values of the third argument.
>     Values "SEEK_DATA" and "SEEK_HOLE" are defined in kernel version 3.1.
>     That is the reason why case statements for these values are
>     enwrapped in #ifdef directive.
> 
> Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
> ---
>  linux-user/strace.c    | 31 +++++++++++++++++++++++++++++++
>  linux-user/strace.list |  2 +-
>  2 files changed, 32 insertions(+), 1 deletion(-)

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