* David Goulet ([email protected]) wrote:
> This patch also introduce the usage function.

Fixed a mistake in the patch (removed the geteuid() from main).

Committed and pushed.

Thanks,

Mathieu

> 
> Signed-off-by: David Goulet <[email protected]>
> ---
>  lttng/lttngtrace.c |   79 +++++++++++++++++++++++++++++++--------------------
>  1 files changed, 48 insertions(+), 31 deletions(-)
> 
> diff --git a/lttng/lttngtrace.c b/lttng/lttngtrace.c
> index 20f8dad..37376a3 100644
> --- a/lttng/lttngtrace.c
> +++ b/lttng/lttngtrace.c
> @@ -52,6 +52,16 @@ static int autotrace;      /*
>                        * we unlink if needed ?
>                        */
>  static int sigfwd_pid;
> +static char *progname = NULL;
> +
> +void usage(void) {
> +     fprintf(stderr, "usage : %s [-o trace_name] command\n", progname);
> +     fprintf(stderr, "\nTracing tool for LTTng and UST\n\
> +\n\
> +Options:\n\
> +     -o trace_name\t\tOutput file of the trace\n\
> +");
> +}
>  
>  static int recunlink(const char *dirname)
>  {
> @@ -151,7 +161,7 @@ static int write_child_pid(pid_t pid, uid_t uid, gid_t 
> gid)
>               perror("Error writing child pid");
>               return -errno;
>       }
> -     
> +
>       fprintf(fp, "%u", (unsigned int) pid);
>       ret = fclose(fp);
>       if (ret)
> @@ -163,32 +173,38 @@ static int write_child_pid(pid_t pid, uid_t uid, gid_t 
> gid)
>       return ret;
>  }
>  
> -static int parse_options(int argc, char *argv[], int *arg)
> +static int parse_options(int argc, char **argv, int *arg)
>  {
> -     int ret = 0;
> -
> -     for (;;) {
> -             if (*arg >= argc
> -                 || argv[*arg][0] != '-'
> -                 || argv[*arg][0] == '\0'
> -                 || argv[*arg][1] == '\0'
> -                 || !strcmp(argv[*arg], "--"))
> -                     break;
> -             switch (argv[*arg][1]) {
> -             case 'o':       if (*arg + 1 >= argc) {
> -                                     printf("Missing -o trace name\n");
> -                                     ret = -EINVAL;
> -                                     break;
> -                             }
> -                             trace_path = argv[*arg + 1];
> -                             (*arg) += 2;
> +     int i, c;
> +
> +     while ((c = getopt(argc, argv, "ho:")) != -1) {
> +             switch (c) {
> +                     case 'o':
> +                             trace_path = strdup(optarg);
>                               break;
> -             default:        printf("Unknown option -%c\n", argv[*arg][1]);
> -                             ret = -EINVAL;
> -                             return ret;
> +                     case 'h':
> +                             usage();
> +                             exit(EXIT_SUCCESS);
> +                     case '?':
> +                             usage();
> +                             exit(EXIT_FAILURE);
> +                     default:
> +                             exit(EXIT_FAILURE);
>               }
>       }
> -     return ret;
> +
> +     if (argc - optind > 0) {
> +             for (i = optind + 1; i < argc; i++) {
> +                     printf ("Non-option argument %s\n", argv[i]);
> +             }
> +     } else {
> +             usage();
> +             exit(EXIT_FAILURE);
> +     }
> +
> +     (*arg) = optind;
> +
> +     return 0;
>  }
>  
>  static int init_trace_path(void)
> @@ -263,16 +279,19 @@ int main(int argc, char *argv[])
>       int arg = 1;
>       sigset_t saved_mask;
>  
> -     if (argc < 2)
> +     progname = argv[0];
> +
> +     if (argc < 2) {
> +             usage();
>               return -ENOENT;
> +     }
>  
> -     euid = geteuid();
>       uid = getuid();
>       egid = getegid();
>       gid = geteuid();
>  
>       if (euid != 0 && uid != 0) {
> -             printf("%s must be setuid root\n", argv[0]);
> +             printf("%s must be setuid root\n", progname);
>               return -EPERM;
>       }
>  
> @@ -281,11 +300,9 @@ int main(int argc, char *argv[])
>       printf_dbg("egid: %d\n", egid);
>       printf_dbg("gid: %d\n", gid);
>  
> -     if (arg < argc) {
> -             ret = parse_options(argc, argv, &arg);
> -             if (ret)
> -                     return ret;
> -     }
> +     ret = parse_options(argc, argv, &arg);
> +     if (ret)
> +             return ret;
>  
>       ret = init_trace_path();
>       gret = (gret == 0) ? ret : gret;
> -- 
> 1.7.3.2
> 
> 
> _______________________________________________
> ltt-dev mailing list
> [email protected]
> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com

_______________________________________________
ltt-dev mailing list
[email protected]
http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev

Reply via email to