Re: [Xen-devel] [PATCH 11/14] xl: Allow control of logging level.

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

Hi Ian,

On 05/28/2010 12:01 AM, Ian Jackson wrote:
> The -v option, which must come before the xl command, increases the
> logging level each time it is supplied.
> 
> Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> ---
>  tools/libxc/xtl_logger_stdio.c |    5 ++++-
>  tools/libxl/xl.c               |   40 
> ++++++++++++++++++++++++++++------------
>  tools/libxl/xl.h               |    2 +-
>  3 files changed, 33 insertions(+), 14 deletions(-)
> 
> diff --git a/tools/libxc/xtl_logger_stdio.c b/tools/libxc/xtl_logger_stdio.c
> index 587c67d..abe274a 100644
> --- a/tools/libxc/xtl_logger_stdio.c
> +++ b/tools/libxc/xtl_logger_stdio.c
> @@ -36,6 +36,9 @@ static void stdiostream_vmessage(xentoollog_logger 
> *logger_in,
>                                   va_list al) {
>      xentoollog_logger_stdiostream *lg = (void*)logger_in;
>  
> +    if (level < lg->min_level)
> +        return;
> +
>      progress_erase(lg);
>  
>      if (lg->flags & XTL_STDIOSTREAM_SHOW_DATE) {
> @@ -82,7 +85,7 @@ static void stdiostream_progress(struct xentoollog_logger 
> *logger_in,
>          this_level = XTL_PROGRESS;
>      }
>  
> -    if (lg->min_level < this_level)
> +    if (this_level < lg->min_level)
>          return;
>  
>      if (lg->progress_erase_len)
> diff --git a/tools/libxl/xl.c b/tools/libxl/xl.c
> index 8b10674..8ddba28 100644
> --- a/tools/libxl/xl.c
> +++ b/tools/libxl/xl.c
> @@ -31,19 +31,38 @@
>  #include "libxl_utils.h"
>  #include "xl.h"
>  
> -xentoollog_logger *logger;
> +xentoollog_logger_stdiostream *logger;
> +
> +static xentoollog_level minmsglevel = XTL_PROGRESS;
>  
>  int main(int argc, char **argv)
>  {
> -    int i;
> +    int opt = 0, i;
> +    char *cmd = 0;
> +
> +    while ((opt = getopt(argc, argv, "+v")) >= 0) {
> +        switch (opt) {
> +        case 'v':
> +            if (minmsglevel > 0) minmsglevel--;
> +            break;
> +        default:
> +            fprintf(stderr, "unknown global option\n");
> +            exit(2);
> +        }
> +    }
> +
> +    cmd = argv[optind++];
>  
> -    if (argc < 2) {
> +    if (!cmd) {
>          help(NULL);
>          exit(1);
>      }
> +    opterr = 0;
> +
> +    logger = xtl_createlogger_stdiostream(stderr, minmsglevel,  0);
> +    if (!logger) exit(1);
>  
> -    logger = xtl_createlogger_stdiostream(stderr, XTL_PROGRESS,  0);
> -    if (libxl_ctx_init(&ctx, LIBXL_VERSION, logger)) {
> +    if (libxl_ctx_init(&ctx, LIBXL_VERSION, (xentoollog_logger*)logger)) {
>          fprintf(stderr, "cannot init xl context\n");
>          exit(1);
>      }
> @@ -51,16 +70,13 @@ int main(int argc, char **argv)
>      srand(time(0));
>  
>      for (i = 0; i < cmdtable_len; i++) {
> -        if (!strcmp(argv[1], cmd_table[i].cmd_name))
> -             cmd_table[i].cmd_impl(argc - 1, argv + 1);
> +        if (!strcmp(cmd, cmd_table[i].cmd_name))
> +             cmd_table[i].cmd_impl(argc, argv);

Why are you change (argc - 1, argv + 1) to (argc, argv)?
this causes many command line parseing problems in current
code...Since we've already fix some of the command line
parseing problems, I wonder if we could change these back?

>      }
>  
>      if (i >= cmdtable_len) {
> -        if (!strcmp(argv[1], "help")) {
> -            if (argc > 2)
> -                help(argv[2]);
> -            else
> -                help(NULL);
> +        if (!strcmp(cmd, "help")) {
> +            help(argv[1]);
>              exit(0);
>          } else {
>              fprintf(stderr, "command not implemented\n");
> diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
> index 8b3644c..3144a64 100644
> --- a/tools/libxl/xl.h
> +++ b/tools/libxl/xl.h
> @@ -77,6 +77,6 @@ extern struct cmd_spec cmd_table[];
>  extern int cmdtable_len;
>  
>  extern struct libxl_ctx ctx;
> -extern xentoollog_logger *logger;
> +extern xentoollog_logger_stdiostream *logger;
>  
>  #endif /* XL_H */


-- 
Regards
Yang Hongyang

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