421 lines
6.9 KiB
C
421 lines
6.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "cgroup_util.h"
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static ssize_t read_text(const char *path, char *buf, size_t max_len)
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{
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ssize_t len;
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int fd;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return fd;
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len = read(fd, buf, max_len - 1);
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if (len < 0)
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goto out;
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buf[len] = 0;
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out:
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close(fd);
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return len;
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}
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static ssize_t write_text(const char *path, char *buf, ssize_t len)
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{
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int fd;
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fd = open(path, O_WRONLY | O_APPEND);
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if (fd < 0)
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return fd;
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len = write(fd, buf, len);
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if (len < 0) {
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close(fd);
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return len;
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}
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close(fd);
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return len;
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}
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char *cg_name(const char *root, const char *name)
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{
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size_t len = strlen(root) + strlen(name) + 2;
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char *ret = malloc(len);
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snprintf(ret, len, "%s/%s", root, name);
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return ret;
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}
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char *cg_name_indexed(const char *root, const char *name, int index)
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{
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size_t len = strlen(root) + strlen(name) + 10;
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char *ret = malloc(len);
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snprintf(ret, len, "%s/%s_%d", root, name, index);
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return ret;
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}
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char *cg_control(const char *cgroup, const char *control)
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{
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size_t len = strlen(cgroup) + strlen(control) + 2;
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char *ret = malloc(len);
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snprintf(ret, len, "%s/%s", cgroup, control);
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return ret;
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}
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int cg_read(const char *cgroup, const char *control, char *buf, size_t len)
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{
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "%s/%s", cgroup, control);
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if (read_text(path, buf, len) >= 0)
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return 0;
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return -1;
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}
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int cg_read_strcmp(const char *cgroup, const char *control,
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const char *expected)
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{
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size_t size;
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char *buf;
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int ret;
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/* Handle the case of comparing against empty string */
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if (!expected)
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size = 32;
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else
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size = strlen(expected) + 1;
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buf = malloc(size);
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if (!buf)
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return -1;
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if (cg_read(cgroup, control, buf, size)) {
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free(buf);
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return -1;
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}
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ret = strcmp(expected, buf);
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free(buf);
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return ret;
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}
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int cg_read_strstr(const char *cgroup, const char *control, const char *needle)
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{
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char buf[PAGE_SIZE];
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if (cg_read(cgroup, control, buf, sizeof(buf)))
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return -1;
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return strstr(buf, needle) ? 0 : -1;
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}
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long cg_read_long(const char *cgroup, const char *control)
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{
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char buf[128];
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if (cg_read(cgroup, control, buf, sizeof(buf)))
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return -1;
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return atol(buf);
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}
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long cg_read_key_long(const char *cgroup, const char *control, const char *key)
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{
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char buf[PAGE_SIZE];
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char *ptr;
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if (cg_read(cgroup, control, buf, sizeof(buf)))
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return -1;
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ptr = strstr(buf, key);
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if (!ptr)
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return -1;
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return atol(ptr + strlen(key));
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}
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int cg_write(const char *cgroup, const char *control, char *buf)
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{
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char path[PATH_MAX];
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ssize_t len = strlen(buf);
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snprintf(path, sizeof(path), "%s/%s", cgroup, control);
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if (write_text(path, buf, len) == len)
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return 0;
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return -1;
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}
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int cg_find_unified_root(char *root, size_t len)
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{
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char buf[10 * PAGE_SIZE];
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char *fs, *mount, *type;
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const char delim[] = "\n\t ";
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if (read_text("/proc/self/mounts", buf, sizeof(buf)) <= 0)
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return -1;
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/*
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* Example:
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* cgroup /sys/fs/cgroup cgroup2 rw,seclabel,noexec,relatime 0 0
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*/
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for (fs = strtok(buf, delim); fs; fs = strtok(NULL, delim)) {
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mount = strtok(NULL, delim);
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type = strtok(NULL, delim);
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strtok(NULL, delim);
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strtok(NULL, delim);
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strtok(NULL, delim);
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if (strcmp(type, "cgroup2") == 0) {
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strncpy(root, mount, len);
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return 0;
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}
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}
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return -1;
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}
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int cg_create(const char *cgroup)
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{
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return mkdir(cgroup, 0644);
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}
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int cg_wait_for_proc_count(const char *cgroup, int count)
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{
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char buf[10 * PAGE_SIZE] = {0};
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int attempts;
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char *ptr;
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for (attempts = 10; attempts >= 0; attempts--) {
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int nr = 0;
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if (cg_read(cgroup, "cgroup.procs", buf, sizeof(buf)))
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break;
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for (ptr = buf; *ptr; ptr++)
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if (*ptr == '\n')
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nr++;
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if (nr >= count)
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return 0;
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usleep(100000);
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}
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return -1;
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}
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int cg_killall(const char *cgroup)
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{
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char buf[PAGE_SIZE];
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char *ptr = buf;
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if (cg_read(cgroup, "cgroup.procs", buf, sizeof(buf)))
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return -1;
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while (ptr < buf + sizeof(buf)) {
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int pid = strtol(ptr, &ptr, 10);
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if (pid == 0)
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break;
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if (*ptr)
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ptr++;
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else
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break;
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if (kill(pid, SIGKILL))
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return -1;
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}
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return 0;
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}
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int cg_destroy(const char *cgroup)
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{
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int ret;
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retry:
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ret = rmdir(cgroup);
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if (ret && errno == EBUSY) {
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cg_killall(cgroup);
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usleep(100);
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goto retry;
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}
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if (ret && errno == ENOENT)
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ret = 0;
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return ret;
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}
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int cg_enter(const char *cgroup, int pid)
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{
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char pidbuf[64];
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snprintf(pidbuf, sizeof(pidbuf), "%d", pid);
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return cg_write(cgroup, "cgroup.procs", pidbuf);
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}
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int cg_enter_current(const char *cgroup)
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{
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char pidbuf[64];
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snprintf(pidbuf, sizeof(pidbuf), "%d", getpid());
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return cg_write(cgroup, "cgroup.procs", pidbuf);
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}
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int cg_run(const char *cgroup,
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int (*fn)(const char *cgroup, void *arg),
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void *arg)
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{
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int pid, retcode;
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pid = fork();
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if (pid < 0) {
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return pid;
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} else if (pid == 0) {
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char buf[64];
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snprintf(buf, sizeof(buf), "%d", getpid());
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if (cg_write(cgroup, "cgroup.procs", buf))
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exit(EXIT_FAILURE);
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exit(fn(cgroup, arg));
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} else {
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waitpid(pid, &retcode, 0);
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if (WIFEXITED(retcode))
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return WEXITSTATUS(retcode);
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else
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return -1;
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}
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}
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int cg_run_nowait(const char *cgroup,
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int (*fn)(const char *cgroup, void *arg),
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void *arg)
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{
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int pid;
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pid = fork();
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if (pid == 0) {
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char buf[64];
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snprintf(buf, sizeof(buf), "%d", getpid());
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if (cg_write(cgroup, "cgroup.procs", buf))
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exit(EXIT_FAILURE);
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exit(fn(cgroup, arg));
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}
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return pid;
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}
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int get_temp_fd(void)
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{
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return open(".", O_TMPFILE | O_RDWR | O_EXCL);
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}
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int alloc_pagecache(int fd, size_t size)
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{
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char buf[PAGE_SIZE];
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struct stat st;
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int i;
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if (fstat(fd, &st))
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goto cleanup;
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size += st.st_size;
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if (ftruncate(fd, size))
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goto cleanup;
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for (i = 0; i < size; i += sizeof(buf))
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read(fd, buf, sizeof(buf));
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return 0;
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cleanup:
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return -1;
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}
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int alloc_anon(const char *cgroup, void *arg)
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{
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size_t size = (unsigned long)arg;
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char *buf, *ptr;
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buf = malloc(size);
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for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE)
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*ptr = 0;
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free(buf);
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return 0;
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}
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int is_swap_enabled(void)
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{
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char buf[PAGE_SIZE];
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const char delim[] = "\n";
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int cnt = 0;
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char *line;
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if (read_text("/proc/swaps", buf, sizeof(buf)) <= 0)
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return -1;
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for (line = strtok(buf, delim); line; line = strtok(NULL, delim))
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cnt++;
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return cnt > 1;
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}
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int set_oom_adj_score(int pid, int score)
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{
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char path[PATH_MAX];
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int fd, len;
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sprintf(path, "/proc/%d/oom_score_adj", pid);
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fd = open(path, O_WRONLY | O_APPEND);
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if (fd < 0)
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return fd;
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len = dprintf(fd, "%d", score);
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if (len < 0) {
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close(fd);
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return len;
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}
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close(fd);
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return 0;
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}
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char proc_read_text(int pid, const char *item, char *buf, size_t size)
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{
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "/proc/%d/%s", pid, item);
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return read_text(path, buf, size);
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}
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