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/*
* Copyright (C) Andrew Clayton
* Copyright (C) F5, Inc.
*/
#include <nxt_main.h>
#include <nxt_cgroup.h>
static int nxt_mk_cgpath_relative(nxt_task_t *task, const char *dir,
char *cgpath);
static nxt_int_t nxt_mk_cgpath(nxt_task_t *task, const char *dir,
char *cgpath);
nxt_int_t
nxt_cgroup_proc_add(nxt_task_t *task, nxt_process_t *process)
{
int len;
char cgprocs[NXT_MAX_PATH_LEN];
FILE *fp;
nxt_int_t ret;
if (task->thread->runtime->type != NXT_PROCESS_MAIN
|| nxt_process_type(process) != NXT_PROCESS_PROTOTYPE
|| process->isolation.cgroup.path == NULL)
{
return NXT_OK;
}
ret = nxt_mk_cgpath(task, process->isolation.cgroup.path, cgprocs);
if (nxt_slow_path(ret == NXT_ERROR)) {
return NXT_ERROR;
}
ret = nxt_fs_mkdir_all((const u_char *) cgprocs, 0777);
if (nxt_slow_path(ret == NXT_ERROR)) {
return NXT_ERROR;
}
len = strlen(cgprocs);
len = snprintf(cgprocs + len, NXT_MAX_PATH_LEN - len, "/cgroup.procs");
if (nxt_slow_path(len >= NXT_MAX_PATH_LEN - len)) {
nxt_errno = ENAMETOOLONG;
return NXT_ERROR;
}
fp = nxt_file_fopen(task, cgprocs, "we");
if (nxt_slow_path(fp == NULL)) {
return NXT_ERROR;
}
setvbuf(fp, NULL, _IONBF, 0);
len = fprintf(fp, "%d\n", process->pid);
nxt_file_fclose(task, fp);
if (nxt_slow_path(len < 0)) {
return NXT_ERROR;
}
return NXT_OK;
}
void
nxt_cgroup_cleanup(nxt_task_t *task, const nxt_process_t *process)
{
char *ptr;
char cgroot[NXT_MAX_PATH_LEN], cgpath[NXT_MAX_PATH_LEN];
nxt_int_t ret;
ret = nxt_mk_cgpath(task, "", cgroot);
if (nxt_slow_path(ret == NXT_ERROR)) {
return;
}
ret = nxt_mk_cgpath(task, process->isolation.cgroup.path, cgpath);
if (nxt_slow_path(ret == NXT_ERROR)) {
return;
}
while (*cgpath != '\0' && strcmp(cgroot, cgpath) != 0) {
rmdir(cgpath);
ptr = strrchr(cgpath, '/');
*ptr = '\0';
}
}
static int
nxt_mk_cgpath_relative(nxt_task_t *task, const char *dir, char *cgpath)
{
int i, len;
char *buf, *ptr;
FILE *fp;
size_t size;
ssize_t nread;
nxt_bool_t found;
fp = nxt_file_fopen(task, "/proc/self/cgroup", "re");
if (nxt_slow_path(fp == NULL)) {
return -1;
}
len = -1;
buf = NULL;
found = 0;
while ((nread = getline(&buf, &size, fp)) != -1) {
if (strncmp(buf, "0::", 3) == 0) {
found = 1;
break;
}
}
nxt_file_fclose(task, fp);
if (!found) {
nxt_errno = ENODATA;
goto out_free_buf;
}
buf[nread - 1] = '\0'; /* lose the trailing '\n' */
ptr = buf;
for (i = 0; i < 2; i++) {
ptr = strchr(ptr, ':');
if (ptr == NULL) {
nxt_errno = ENODATA;
goto out_free_buf;
}
ptr++;
}
len = snprintf(cgpath, NXT_MAX_PATH_LEN, NXT_CGROUP_ROOT "%s/%s",
ptr, dir);
out_free_buf:
nxt_free(buf);
return len;
}
static nxt_int_t
nxt_mk_cgpath(nxt_task_t *task, const char *dir, char *cgpath)
{
int len;
/*
* If the path from the config is relative, we need to make
* the cgroup path include the main unit processes cgroup. I.e
*
* NXT_CGROUP_ROOT/<main process cgroup>/<cgroup path>
*/
if (dir[0] != '/') {
len = nxt_mk_cgpath_relative(task, dir, cgpath);
} else {
len = snprintf(cgpath, NXT_MAX_PATH_LEN, NXT_CGROUP_ROOT "%s", dir);
}
if (len == -1) {
return NXT_ERROR;
}
if (len >= NXT_MAX_PATH_LEN) {
nxt_errno = ENAMETOOLONG;
return NXT_ERROR;
}
return NXT_OK;
}
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