On 05/20/2011 02:13 PM, Ivana Hutarova Varekova wrote:
> Most of the tools use <controllers>:<path> together with -g option,
> this patch adds this version of usage of -g option to cgget tool
> Older have the possibility to use -g in form -g <controller> <path>.
>
> --------------
> old version:
> $ cgget -h
> Usage: cgget [-nv] [-r<name>] [-g<controller>] [-a] ...<path> ...
>
> new version:
> $ ./cgget -h
> Usage: cgget [-nv] [-r<name>] [-g<controller>] [-a] <path> ...
> or: cgget [-nv] [-r<name>] -g<controller>:<path> ...
>
> Signed-off-by: Ivana Hutarova Varekova <varek...@redhat.com>
> ---
>
> src/tools/cgget.c | 286
> ++++++++++++++++++++++++++++++-----------------------
> 1 files changed, 163 insertions(+), 123 deletions(-)
>
> diff --git a/src/tools/cgget.c b/src/tools/cgget.c
> index 87cdc8e..e89b5f8 100644
> --- a/src/tools/cgget.c
> +++ b/src/tools/cgget.c
> @@ -24,6 +24,12 @@ static struct option const long_options[] =
> {NULL, 0, NULL, 0}
> };
>
> +enum group{
> + GR_NOTSET = 0, /* 0 .. path not specified -g<g> or -a not used */
> + GR_GROUP, /* 1 .. path not specified -g<g> or -a used */
> + GR_LIST /* 2 .. path specified using -g<g>:<p> */
Only GR_NOTSET is used below, magic numbers are used instead of the
other items!
> +};
> +
>
> static void usage(int status, const char *program_name)
> {
> @@ -32,12 +38,15 @@ static void usage(int status, const char *program_name)
> " try %s -h' for more information.\n",
> program_name);
> else {
> - printf("Usage: %s [-nv] [-r<name>] [-g<controller>] [-a] ... "\
> - "<path> ...\n", program_name);
> + fprintf(stdout, "Usage: %s [-nv] [-r<name>] "\
> + "[-g<controller>] [-a] <path> ...\n", program_name);
> + fprintf(stdout, " or: %s [-nv] [-r<name>] "\
> + "-g<controller>:<path> ...\n", program_name);
> }
> }
>
> -static int display_one_record(char *name, struct cgroup_controller
> *group_controller,
> +static int display_record(char *name,
> + struct cgroup_controller *group_controller,
> const char *group_name, const char *program_name, int mode)
> {
> int ret = 0;
> @@ -54,58 +63,52 @@ static int display_one_record(char *name, struct
> cgroup_controller *group_contro
>
> if (ret == ECGEOF) {
> printf("\n");
> - ret = 0;
> goto read_end;
> }
>
> - if (ret != 0) {
> - fprintf(stderr, "variable file read failed %d\n", ret);
> - return ret;
> - }
> + if (ret != 0)
> + goto end;
>
> printf("%s", line);
> - if (line[strlen(line)-1] == '\n') {
> - /* if the value continue on the net row,
> - * indent the next row
> - */
> + if (line[strlen(line)-1] == '\n')
> + /* if value continue on the next row. indent it */
> ind = 1;
> - }
> +
>
> /* read iteratively the whole value */
> while ((ret = cgroup_read_value_next(&handle, line, LL_MAX)) == 0) {
> - if (ind == 1) {
> + if (ind == 1)
> printf("\t");
> - ind = 0;
> - }
> -
> printf("%s", line);
> + ind = 0;
>
> - if (line[strlen(line)-1] == '\n') {
> - /* if the value continue on the net row,
> - * indent the next row
> - */
> + /* if value continue on the next row. indent it */
> + if (line[strlen(line)-1] == '\n')
> ind = 1;
> - }
> }
>
> +read_end:
> + cgroup_read_value_end(&handle);
> if (ret == ECGEOF)
> ret = 0;
> -read_end:
>
> - cgroup_read_value_end(&handle);
> +end:
> + if (ret != 0)
> + fprintf(stderr, "variable file read failed %s\n",
> + cgroup_strerror(ret));
> return ret;
> }
>
>
>
> -static int display_name_values(char **names, int count, const char*
> group_name,
> +static int display_name_values(char **names, const char* group_name,
> const char *program_name, int mode)
> {
> int i;
> struct cgroup_controller *group_controller = NULL;
> struct cgroup *group = NULL;
> int ret = 0;
> - char *controller = NULL, *parameter = NULL;
> + char *controller = NULL, *dot;
>
> group = cgroup_new_cgroup(group_name);
> if (group == NULL) {
> @@ -120,7 +123,8 @@ static int display_name_values(char **names, int count,
> const char* group_name,
> goto err;
> }
>
> - for (i = 0; i < count; i++) {
> + i = 0;
> + while (names[i] != NULL) {
> /* Parse the controller out of 'controller.parameter'. */
> free(controller);
> controller = strdup(names[i]);
> @@ -129,15 +133,14 @@ static int display_name_values(char **names, int count,
> const char* group_name,
> ret = -1;
> goto err;
> }
> - parameter = strchr(controller, '.');
> - if (parameter == NULL) {
> + dot = strchr(controller, '.');
> + if (dot == NULL) {
> fprintf(stderr, "%s: error parsing parameter name\n" \
> " '%s'", program_name, names[i]);
> ret = -1;
> goto err;
> }
> - *parameter = '\0';
> - parameter++;
> + *dot = '\0';
>
> /* Find appropriate controller. */
> group_controller = cgroup_get_controller(group, controller);
> @@ -150,10 +153,11 @@ static int display_name_values(char **names, int count,
> const char* group_name,
> }
>
> /* Finally read the parameter value.*/
> - ret = display_one_record(names[i], group_controller,
> + ret = display_record(names[i], group_controller,
> group_name, program_name, mode);
> if (ret != 0)
> goto err;
> + i++;
> }
> err:
> if (controller)
> @@ -163,8 +167,8 @@ err:
> return ret;
> }
>
> -static int display_controller_values(char **controllers, int count,
> - const char *group_name, const char *program_name, int mode)
> +static int display_controller_values(char **controllers, const char
> *group_name,
> + const char *program_name, int mode)
> {
> struct cgroup *group = NULL;
> struct cgroup_controller *group_controller = NULL;
> @@ -190,8 +194,8 @@ static int display_controller_values(char **controllers,
> int count,
> }
>
> /* for all wanted controllers */
> - for (j = 0; j < count; j++) {
> -
> + j = 0;
> + while (controllers[j] != NULL) {
> /* read the controller group data */
> group_controller = cgroup_get_controller(group, controllers[j]);
> if (group_controller == NULL) {
> @@ -208,7 +212,7 @@ static int display_controller_values(char **controllers,
> int count,
> for (i = 0; i < name_count; i++) {
> name = cgroup_get_value_name(group_controller, i);
> if (name != NULL) {
> - ret = display_one_record(name, group_controller,
> + ret = display_record(name, group_controller,
> group_name, program_name, mode);
> if (ret) {
> result = ret;
> @@ -216,6 +220,7 @@ static int display_controller_values(char **controllers,
> int count,
> }
> }
> }
> + j = j+1;
> }
>
> err:
> @@ -224,62 +229,67 @@ err:
>
> }
>
> -static int display_all_controllers(const char *group_name,
> - const char *program_name, int mode)
> +static int display_values(char **controllers, int max, const char
> *group_name,
> + char **names, int mode, const char *program_name)
> {
> - void *handle;
> - int ret;
> - struct cgroup_mount_point controller;
> - char *name;
> - int succ = 0;
> + int ret, result = 0;
>
> - ret = cgroup_get_controller_begin(&handle, &controller);
> + /* display the directory if needed */
> + if (mode & MODE_SHOW_HEADERS)
> + printf("%s:\n", group_name);
>
> - /* go through the list of controllers/mount point pairs */
> - while (ret == 0) {
> - name = controller.name;
> - succ |= display_controller_values(&name, 1,
> - group_name, program_name, mode);
> - ret = cgroup_get_controller_next(&handle, &controller);
> + /* display all wanted variables */
> + if (names[0] != NULL) {
> + ret = display_name_values(names, group_name, program_name,
> + mode);
> + if (ret)
> + result = ret;
> + }
> +
> + /* display all wanted controllers */
> + if (controllers[0] != NULL) {
> + ret = display_controller_values(controllers, group_name,
> + program_name, mode);
> + if (ret)
> + result = ret;
> }
>
> - cgroup_get_controller_end(&handle);
> - return succ;
> + /* separate each group with empty line. */
> + if (mode & MODE_SHOW_HEADERS)
> + printf("\n");
> +
> + return result;
> }
>
> -static int add_record_to_buffer(int *p_number,
> - int *p_max, char ***p_records, char *new_rec)
> +void add_record_to_buffer(char **buffer, char *record, int capacity)
> {
> + int i;
>
> - if (*p_number >= *p_max) {
> - *p_max += CG_NV_MAX;
> - *p_records = (char **) realloc(*p_records,
> - *p_max * sizeof(char *));
> - if (!(*p_records)) {
> - fprintf(stderr, "not enough memory\n");
> - return -1;
> - }
> + /* find first free entry inside the cgroup data array */
> + for (i = 0; i < capacity; i++) {
> + if (!buffer[i])
> + break;
> }
>
> - (*p_records)[*p_number] = new_rec;
> - (*p_number)++;
> -
> - return 0;
> + if (i < capacity)
> + buffer[i] = strdup(record);
> }
>
> +
> int main(int argc, char *argv[])
> {
> int ret = 0;
> int result = 0;
> int c, i;
> + int group_needed = GR_NOTSET;
>
> - char **names = NULL;
> - int n_number = 0;
> - int n_max = 0;
> + int capacity = argc + CG_CONTROLLER_MAX; /* maximal number of records */
> + struct cgroup_group_spec **cgroup_list; /* list of all groups */
> + char **names; /* list of wanted variable names */
> + char **controllers; /* list of wanted controllers*/
>
> - char **controllers = NULL;
> - int c_number = 0;
> - int c_max = 0;
> + void *handle;
> + struct cgroup_mount_point controller;
>
> int mode = MODE_SHOW_NAMES | MODE_SHOW_HEADERS;
>
> @@ -289,6 +299,17 @@ int main(int argc, char *argv[])
> return 1;
> }
>
> + names = (char **)calloc(capacity+1, sizeof(char *));
> + controllers = (char **)calloc(capacity+1, sizeof(char *));
> + cgroup_list = (struct cgroup_group_spec **)calloc(capacity,
> + sizeof(struct cgroup_group_spec *));
> + if ((names == NULL) || (controllers == NULL) ||
> + (cgroup_list == NULL)) {
> + fprintf(stderr, "%s: out of memory\n", argv[0]);
> + ret = -1;
> + goto err;
> + }
> +
> /* Parse arguments. */
> while ((c = getopt_long(argc, argv, "r:hnvg:a", long_options, NULL))
> > 0) {
> @@ -311,23 +332,49 @@ int main(int argc, char *argv[])
>
> case 'r':
> /* Add name to buffer. */
> - ret = add_record_to_buffer(
> - &n_number, &n_max, &names, optarg);
> + add_record_to_buffer(names, optarg, capacity);
> if (ret) {
> result = ret;
> goto err;
> }
> break;
> case 'g':
> - /* for each controller add all variables to list */
> - ret = add_record_to_buffer(&c_number,
> - &c_max, &controllers, optarg);
> - if (ret) {
> - result = ret;
> - goto err;
> + if (strchr(optarg, ':') == NULL) {
> + /* -g <group> */
> + if (group_needed == 2) {
> + usage(1, argv[0]);
> + result = -1;
> + goto err;
> + }
> + group_needed = 1;
> + add_record_to_buffer(controllers, optarg,
> + capacity);
> + } else {
> + /* -g <group>:<path> */
> + if (group_needed == 1) {
> + usage(1, argv[0]);
> + result = -1;
> + goto err;
> + }
> + group_needed = 2;
> + ret = parse_cgroup_spec(cgroup_list, optarg,
> + capacity);
> + if (ret) {
> + fprintf(stderr, "%s: cgroup controller/"
> + "path parsing failed (%s)\n",
> + argv[0], argv[optind]);
> + ret = -1;
> + goto err;
> + }
> }
> break;
> case 'a':
> + if (group_needed == 2) {
> + usage(1, argv[0]);
> + result = -1;
> + goto err;
> + }
> + group_needed = 1;
> /* go through cgroups for all possible controllers */
> mode |= MODE_SHOW_ALL_CONTROLLERS;
> break;
> @@ -335,23 +382,17 @@ int main(int argc, char *argv[])
> usage(1, argv[0]);
> result = -1;
> goto err;
> - break;
> }
> }
>
> - if (!argv[optind]) {
> - fprintf(stderr, "%s: no cgroup specified\n", argv[0]);
> + if (((group_needed == 2) && (argv[optind])) ||
> + ((group_needed != 2) && (!argv[optind]))) {
> + /* mixed -g <controller>:<path> and <path> or path not set */
> + usage(1, argv[0]);
> result = -1;
> goto err;
> }
>
> - /*
> - * if no controller or variable is set
> - * then show values of all possible variables
> - */
> - if ((c_number == 0) && (n_number == 0))
> - mode |= MODE_SHOW_ALL_CONTROLLERS;
> -
> /* Initialize libcgroup. */
> ret = cgroup_init();
> if (ret) {
> @@ -361,44 +402,43 @@ int main(int argc, char *argv[])
> goto err;
> }
>
> - if (!argv[optind]) {
> - fprintf(stderr, "%s: no cgroup specified\n", argv[0]);
> - result = -1;
> - goto err;
> + if ((mode & MODE_SHOW_ALL_CONTROLLERS) ||
> + ((controllers[0] == NULL) && (names[0] == NULL)
> + && (cgroup_list[0] == NULL))) {
> + /* show info about all controllers */
> + ret = cgroup_get_controller_begin(&handle, &controller);
> + /* go through list of controllers, add them to the list */
> + while (ret == 0) {
> + add_record_to_buffer(controllers, controller.name,
> + capacity);
> + ret = cgroup_get_controller_next(&handle, &controller);
> + }
> + cgroup_get_controller_end(&handle);
> + }
> +
> + /* Parse control groups set by -g<c>:<p> pairs */
> + for (i = 0; i < capacity; i++) {
> + if (!cgroup_list[i])
> + break;
> + ret |= display_values(cgroup_list[i]->controllers, capacity,
> + cgroup_list[i]->path, names, mode, argv[0]);
> }
>
> /* Parse control groups and print them .*/
> for (i = optind; i < argc; i++) {
> -
> - /* display the directory if needed */
> - if (mode & MODE_SHOW_HEADERS)
> - printf("%s:\n", argv[i]);
> -
> - ret = display_name_values(names,
> - n_number, argv[i], argv[0], mode);
> - if (ret)
> - result = ret;
> -
> - ret = display_controller_values(controllers, c_number, argv[i],
> - argv[0], mode - (mode & MODE_SHOW_ALL_CONTROLLERS));
> - if (ret) {
> - result = ret;
> - goto err;
> - }
> -
> - if (mode & MODE_SHOW_ALL_CONTROLLERS) {
> - ret = display_all_controllers(argv[i], argv[0], mode);
> - /* remember the error but continue showing the rest */
> - if (ret)
> - result = ret;
> - }
> -
> - /* Separate each group with empty line. */
> - if (mode & MODE_SHOW_HEADERS && i != argc-1)
> - printf("\n");
> + ret |= display_values(controllers, capacity,
> + argv[i], names, mode, argv[0]);
> }
>
> err:
> - free(names);
> + for (i = 0; i < capacity; i++) {
> + if (cgroup_list[i])
> + cgroup_free_group_spec(cgroup_list[i]);
> + if (controllers[i])
> + free(controllers[i]);
> + if (names[i])
> + free(names[i]);
> + }
> +
free(names);
free(cgroup_list);
free(controllers);
> return result;
> }
>
>
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