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#include <libcgroup.h>
#include <libcgroup-internal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include "tools-common.h"
#define FL_RULES 1
#define FL_COPY 2
enum {
COPY_FROM_OPTION = CHAR_MAX + 1
};
static struct option const long_options[] =
{
{"rule", required_argument, NULL, 'r'},
{"help", no_argument, NULL, 'h'},
{"copy-from", required_argument, NULL, COPY_FROM_OPTION},
{NULL, 0, NULL, 0}
};
int flags; /* used input method */
struct cgroup *copy_name_value_from_cgroup(char src_cg_path[FILENAME_MAX])
{
int ret = 0;
struct cgroup *src_cgroup;
/* create source cgroup */
src_cgroup = cgroup_new_cgroup(src_cg_path);
if (!src_cgroup) {
fprintf(stderr, "can't create cgroup: %s\n",
cgroup_strerror(ECGFAIL));
goto scgroup_err;
}
/* copy the name-version values to the cgroup structure */
ret = cgroup_get_cgroup(src_cgroup);
if (ret != 0) {
fprintf(stderr, "cgroup %s error: %s \n",
src_cg_path, cgroup_strerror(ret));
goto scgroup_err;
}
return src_cgroup;
scgroup_err:
cgroup_free(&src_cgroup);
return NULL;
}
void usage(int status, char *program_name)
{
if (status != 0)
fprintf(stderr, "Wrong input parameters,"
" try %s --help' for more information.\n",
program_name);
else {
printf("Usage: %s [-r <name=value>] <cgroup_path> ...\n"
" or: %s --copy-from <source_cgrup_path> "
"<cgroup_path> ...\n",
program_name, program_name);
}
}
int main(int argc, char *argv[])
{
int ret = 0;
int c;
char *buf;
struct control_value *name_value = NULL;
int nv_number = 0;
int nv_max = 0;
char src_cg_path[FILENAME_MAX];
struct cgroup *src_cgroup;
struct cgroup *cgroup;
/* no parametr on input */
if (argc < 2) {
fprintf(stderr, "Usage is %s -r <name=value> "
"<relative path to cgroup>\n", argv[0]);
return -1;
}
/* parse arguments */
while ((c = getopt_long (argc, argv,
"r:h", long_options, NULL)) != -1) {
switch (c) {
case 'h':
usage(0, argv[0]);
ret = 0;
goto err;
break;
case 'r':
if ((flags & FL_COPY) != 0) {
usage(1, argv[0]);
ret = -1;
goto err;
}
flags |= FL_RULES;
/* add name-value pair to buffer
(= name_value variable) */
if (nv_number >= nv_max) {
nv_max += CG_NV_MAX;
name_value = (struct control_value *)
realloc(name_value,
nv_max * sizeof(struct control_value));
if (!name_value) {
fprintf(stderr, "%s: "
"not enough memory\n",
argv[0]);
ret = -1;
goto err;
}
}
/* parse optarg value */
/* there is necessary to input the tuple n=v */
buf = strtok(optarg, "=");
if (buf == NULL) {
fprintf(stderr, "%s: "
"wrong parameter of option -r: %s\n",
argv[0], optarg);
ret = -1;
goto err;
}
strncpy(name_value[nv_number].name, buf, FILENAME_MAX);
name_value[nv_number].name[FILENAME_MAX-1] = '\0';
buf = strtok(NULL, "=");
if (buf == NULL) {
fprintf(stderr, "%s: "
"wrong parameter of option -r: %s\n",
argv[0], optarg);
ret = -1;
goto err;
}
strncpy(name_value[nv_number].value, buf, CG_VALUE_MAX);
name_value[nv_number].value[CG_VALUE_MAX-1] = '\0';
nv_number++;
break;
case COPY_FROM_OPTION:
if (flags != 0) {
usage(1, argv[0]);
ret = -1;
goto err;
}
flags |= FL_COPY;
strncpy(src_cg_path, optarg, FILENAME_MAX);
src_cg_path[FILENAME_MAX-1] = '\0';
break;
default:
usage(1, argv[0]);
ret = -1;
goto err;
break;
}
}
/* no cgroup name */
if (!argv[optind]) {
fprintf(stderr, "%s: no cgroup specified\n", argv[0]);
ret = -1;
goto err;
}
if (flags == 0) {
fprintf(stderr, "%s: no name-value pair was set\n", argv[0]);
ret = -1;
goto err;
}
/* initialize libcgroup */
ret = cgroup_init();
if (ret) {
fprintf(stderr, "%s: libcgroup initialization failed: %s\n",
argv[0], cgroup_strerror(ret));
goto err;
}
/* copy the name-value pairs from -r options */
if ((flags & FL_RULES) != 0) {
src_cgroup = create_cgroup_from_name_value_pairs(
"tmp", name_value, nv_number);
if (src_cgroup == NULL)
goto err;
}
/* copy the name-value from the given group */
if ((flags & FL_COPY) != 0) {
src_cgroup = copy_name_value_from_cgroup(src_cg_path);
if (src_cgroup == NULL)
goto err;
}
while (optind < argc) {
/* create new cgroup */
cgroup = cgroup_new_cgroup(argv[optind]);
if (!cgroup) {
ret = ECGFAIL;
fprintf(stderr, "%s: can't add new cgroup: %s\n",
argv[0], cgroup_strerror(ret));
goto cgroup_free_err;
}
/* copy the values from the source cgroup to new one */
ret = cgroup_copy_cgroup(cgroup, src_cgroup);
if (ret != 0) {
fprintf(stderr, "%s: cgroup %s error: %s \n",
argv[0], src_cg_path, cgroup_strerror(ret));
goto cgroup_free_err;
}
/* modify cgroup based on values of the new one */
ret = cgroup_modify_cgroup(cgroup);
if (ret) {
fprintf(stderr, "%s: "
"the group can't be modified\n",
argv[0]);
goto cgroup_free_err;
}
optind++;
cgroup_free(&cgroup);
}
cgroup_free_err:
if (cgroup)
cgroup_free(&cgroup);
cgroup_free(&src_cgroup);
err:
free(name_value);
return ret;
}
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