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conmon: Add helper function to get pid cgroup subsystem path

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Signed-off-by: Mrunal Patel <mpatel@redhat.com>
This commit is contained in:
Mrunal Patel 2017-05-22 19:01:09 -07:00 committed by Mrunal Patel
parent 8e60251b29
commit 04ddb57ed7
1 changed files with 62 additions and 0 deletions
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62
conmon/conmon.c
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@ -104,6 +104,8 @@ static GOptionEntry entries[] =
/* strlen("1997-03-25T13:20:42.999999999+01:00") + 1 */ /* strlen("1997-03-25T13:20:42.999999999+01:00") + 1 */
#define TSBUFLEN 36 #define TSBUFLEN 36
#define CGROUP_ROOT "/sys/fs/cgroup"
int set_k8s_timestamp(char *buf, ssize_t buflen) int set_k8s_timestamp(char *buf, ssize_t buflen)
{ {
struct tm *tm; struct tm *tm;
@ -233,6 +235,66 @@ next:
return 0; return 0;
} }
/*
* Returns the path for specified controller name for a pid.
* Returns NULL on error.
*/
static char *process_cgroup_subsystem_path(int pid, const char *subsystem) {
_cleanup_free_ char *cgroups_file_path = NULL;
int rc;
rc = asprintf(&cgroups_file_path, "/proc/%d/cgroup", pid);
if (rc < 0) {
nwarn("Failed to allocate memory for cgroups file path");
return NULL;
}
_cleanup_fclose_ FILE *fp = NULL;
fp = fopen(cgroups_file_path, "r");
if (fp == NULL) {
nwarn("Failed to open cgroups file: %s", cgroups_file_path);
return NULL;
}
_cleanup_free_ char *line = NULL;
ssize_t read;
size_t len = 0;
char *ptr;
char *subsystem_path = NULL;
while ((read = getline(&line, &len, fp)) != -1) {
ptr = strchr(line, ':');
if (ptr == NULL) {
nwarn("Error parsing cgroup, ':' not found: %s", line);
return NULL;
}
ptr++;
if (!strncmp(ptr, subsystem, strlen(subsystem))) {
char *path = strchr(ptr, '/');
if (path == NULL) {
nwarn("Error finding path in cgroup: %s", line);
return NULL;
}
ninfo("PATH: %s", path);
const char *subpath = strchr(subsystem, '=');
if (subpath == NULL) {
subpath = subsystem;
} else {
subpath++;
}
rc = asprintf(&subsystem_path, "%s/%s%s", CGROUP_ROOT, subpath, path);
if (rc < 0) {
nwarn("Failed to allocate memory for subsystemd path");
return NULL;
}
ninfo("SUBSYSTEM_PATH: %s", subsystem_path);
subsystem_path[strlen(subsystem_path) - 1] = '\0';
return subsystem_path;
}
}
return NULL;
}
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
int ret, runtime_status; int ret, runtime_status;