Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Helper functions for handling target threads/cpus
 *
 * Copyright (C) 2012, LG Electronics, Namhyung Kim <namhyung.kim@lge.com>
 */
 
#include "target.h"
 
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/kernel.h>
#include <linux/string.h>
 
enum target_errno target__validate(struct target *target)
{
<------>enum target_errno ret = TARGET_ERRNO__SUCCESS;
 
<------>if (target->pid)
<------><------>target->tid = target->pid;
 
<------>/* CPU and PID are mutually exclusive */
<------>if (target->tid && target->cpu_list) {
<------><------>target->cpu_list = NULL;
<------><------>if (ret == TARGET_ERRNO__SUCCESS)
<------><------><------>ret = TARGET_ERRNO__PID_OVERRIDE_CPU;
<------>}
 
<------>/* UID and PID are mutually exclusive */
<------>if (target->tid && target->uid_str) {
<------><------>target->uid_str = NULL;
<------><------>if (ret == TARGET_ERRNO__SUCCESS)
<------><------><------>ret = TARGET_ERRNO__PID_OVERRIDE_UID;
<------>}
 
<------>/* UID and CPU are mutually exclusive */
<------>if (target->uid_str && target->cpu_list) {
<------><------>target->cpu_list = NULL;
<------><------>if (ret == TARGET_ERRNO__SUCCESS)
<------><------><------>ret = TARGET_ERRNO__UID_OVERRIDE_CPU;
<------>}
 
<------>/* PID and SYSTEM are mutually exclusive */
<------>if (target->tid && target->system_wide) {
<------><------>target->system_wide = false;
<------><------>if (ret == TARGET_ERRNO__SUCCESS)
<------><------><------>ret = TARGET_ERRNO__PID_OVERRIDE_SYSTEM;
<------>}
 
<------>/* UID and SYSTEM are mutually exclusive */
<------>if (target->uid_str && target->system_wide) {
<------><------>target->system_wide = false;
<------><------>if (ret == TARGET_ERRNO__SUCCESS)
<------><------><------>ret = TARGET_ERRNO__UID_OVERRIDE_SYSTEM;
<------>}
 
<------>/* THREAD and SYSTEM/CPU are mutually exclusive */
<------>if (target->per_thread && (target->system_wide || target->cpu_list)) {
<------><------>target->per_thread = false;
<------><------>if (ret == TARGET_ERRNO__SUCCESS)
<------><------><------>ret = TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD;
<------>}
 
<------>return ret;
}
 
enum target_errno target__parse_uid(struct target *target)
{
<------>struct passwd pwd, *result;
<------>char buf[1024];
<------>const char *str = target->uid_str;
 
<------>target->uid = UINT_MAX;
<------>if (str == NULL)
<------><------>return TARGET_ERRNO__SUCCESS;
 
<------>/* Try user name first */
<------>getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
 
<------>if (result == NULL) {
<------><------>/*
<------><------> * The user name not found. Maybe it's a UID number.
<------><------> */
<------><------>char *endptr;
<------><------>int uid = strtol(str, &endptr, 10);
 
<------><------>if (*endptr != '\0')
<------><------><------>return TARGET_ERRNO__INVALID_UID;
 
<------><------>getpwuid_r(uid, &pwd, buf, sizeof(buf), &result);
 
<------><------>if (result == NULL)
<------><------><------>return TARGET_ERRNO__USER_NOT_FOUND;
<------>}
 
<------>target->uid = result->pw_uid;
<------>return TARGET_ERRNO__SUCCESS;
}
 
/*
 * This must have a same ordering as the enum target_errno.
 */
static const char *target__error_str[] = {
<------>"PID/TID switch overriding CPU",
<------>"PID/TID switch overriding UID",
<------>"UID switch overriding CPU",
<------>"PID/TID switch overriding SYSTEM",
<------>"UID switch overriding SYSTEM",
<------>"SYSTEM/CPU switch overriding PER-THREAD",
<------>"Invalid User: %s",
<------>"Problems obtaining information for user %s",
};
 
int target__strerror(struct target *target, int errnum,
<------><------><------>  char *buf, size_t buflen)
{
<------>int idx;
<------>const char *msg;
 
<------>BUG_ON(buflen == 0);
 
<------>if (errnum >= 0) {
<------><------>str_error_r(errnum, buf, buflen);
<------><------>return 0;
<------>}
 
<------>if (errnum <  __TARGET_ERRNO__START || errnum >= __TARGET_ERRNO__END)
<------><------>return -1;
 
<------>idx = errnum - __TARGET_ERRNO__START;
<------>msg = target__error_str[idx];
 
<------>switch (errnum) {
<------>case TARGET_ERRNO__PID_OVERRIDE_CPU ...
<------>     TARGET_ERRNO__SYSTEM_OVERRIDE_THREAD:
<------><------>snprintf(buf, buflen, "%s", msg);
<------><------>break;
 
<------>case TARGET_ERRNO__INVALID_UID:
<------>case TARGET_ERRNO__USER_NOT_FOUND:
<------><------>snprintf(buf, buflen, msg, target->uid_str);
<------><------>break;
 
<------>default:
<------><------>/* cannot reach here */
<------><------>break;
<------>}
 
<------>return 0;
}