p71924506
/
kernel_liteos_a
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
kernel_liteos_a/kernel/base/ipc/los_signal.c

690 lines
19 KiB
C
Raw Blame History

/*
* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "los_signal.h"
#include "pthread.h"
#include "los_process_pri.h"
#include "los_sched_pri.h"
#include "los_hw_pri.h"
#include "user_copy.h"
#ifdef LOSCFG_SECURITY_CAPABILITY
#include "capability_api.h"
#endif
#include "los_atomic.h"
#ifdef LOSCFG_KERNEL_VM
int raise(int sig)
{
(VOID)sig;
PRINT_ERR("%s NOT SUPPORT\n", __FUNCTION__);
errno = ENOSYS;
return -1;
}
#define GETUNMASKSET(procmask, pendFlag) ((~(procmask)) & (sigset_t)(pendFlag))
#define UINT64_BIT_SIZE 64
int OsSigIsMember(const sigset_t *set, int signo)
{
int ret = LOS_NOK;
/* In musl, sig No bits 00000100 present sig No 3, but 1<< 3 = 00001000, so signo needs minus 1 */
signo -= 1;
/* Verify the signal */
if (GOOD_SIGNO(signo)) {
/* Check if the signal is in the set */
ret = ((*set & SIGNO2SET((unsigned int)signo)) != 0);
}
return ret;
}
STATIC INLINE VOID OsSigWaitTaskWake(LosTaskCB *taskCB, INT32 signo)
{
sig_cb *sigcb = &taskCB->sig;
if (!LOS_ListEmpty(&sigcb->waitList) && OsSigIsMember(&sigcb->sigwaitmask, signo)) {
OsTaskWakeClearPendMask(taskCB);
OsSchedTaskWake(taskCB);
OsSigEmptySet(&sigcb->sigwaitmask);
}
}
STATIC UINT32 OsPendingTaskWake(LosTaskCB *taskCB, INT32 signo)
{
if (!OsTaskIsPending(taskCB) || !OsProcessIsUserMode(OS_PCB_FROM_PID(taskCB->processID))) {
return 0;
}
if ((signo != SIGKILL) && (taskCB->waitFlag != OS_TASK_WAIT_SIGNAL)) {
return 0;
}
switch (taskCB->waitFlag) {
case OS_TASK_WAIT_PROCESS:
case OS_TASK_WAIT_GID:
case OS_TASK_WAIT_ANYPROCESS:
OsWaitWakeTask(taskCB, OS_INVALID_VALUE);
break;
case OS_TASK_WAIT_JOIN:
OsTaskWakeClearPendMask(taskCB);
OsSchedTaskWake(taskCB);
break;
case OS_TASK_WAIT_SIGNAL:
OsSigWaitTaskWake(taskCB, signo);
break;
#ifdef LOSCFG_KERNEL_LITEIPC
case OS_TASK_WAIT_LITEIPC:
taskCB->ipcStatus &= ~IPC_THREAD_STATUS_PEND;
OsTaskWakeClearPendMask(taskCB);
OsSchedTaskWake(taskCB);
break;
#endif
case OS_TASK_WAIT_FUTEX:
OsFutexNodeDeleteFromFutexHash(&taskCB->futex, TRUE, NULL, NULL);
OsTaskWakeClearPendMask(taskCB);
OsSchedTaskWake(taskCB);
break;
default:
break;
}
return 0;
}
int OsTcbDispatch(LosTaskCB *stcb, siginfo_t *info)
{
bool masked = FALSE;
sig_cb *sigcb = &stcb->sig;
OS_RETURN_IF_NULL(sigcb);
/* If signo is 0, not send signal, just check process or pthread exist */
if (info->si_signo == 0) {
return 0;
}
masked = (bool)OsSigIsMember(&sigcb->sigprocmask, info->si_signo);
if (masked) {
/* If signal is in wait list and mask list, need unblock it */
if (LOS_ListEmpty(&sigcb->waitList) ||
(!LOS_ListEmpty(&sigcb->waitList) && !OsSigIsMember(&sigcb->sigwaitmask, info->si_signo))) {
OsSigAddSet(&sigcb->sigPendFlag, info->si_signo);
}
} else {
/* unmasked signal actions */
OsSigAddSet(&sigcb->sigFlag, info->si_signo);
}
(void) memcpy_s(&sigcb->sigunbinfo, sizeof(siginfo_t), info, sizeof(siginfo_t));
return OsPendingTaskWake(stcb, info->si_signo);
}
void OsSigMaskSwitch(LosTaskCB * const rtcb, sigset_t set)
{
sigset_t unmaskset;
rtcb->sig.sigprocmask = set;
unmaskset = GETUNMASKSET(rtcb->sig.sigprocmask, rtcb->sig.sigPendFlag);
if (unmaskset != NULL_SIGNAL_SET) {
/* pendlist do */
rtcb->sig.sigFlag |= unmaskset;
rtcb->sig.sigPendFlag ^= unmaskset;
}
}
int OsSigprocMask(int how, const sigset_t_l *setl, sigset_t_l *oldset)
{
LosTaskCB *spcb = NULL;
sigset_t oldSigprocmask;
int ret = LOS_OK;
unsigned int intSave;
sigset_t set;
int retVal;
if (setl != NULL) {
retVal = LOS_ArchCopyFromUser(&set, &(setl->sig[0]), sizeof(sigset_t));
if (retVal != 0) {
return -EFAULT;
}
}
SCHEDULER_LOCK(intSave);
spcb = OsCurrTaskGet();
/* If requested, copy the old mask to user. */
oldSigprocmask = spcb->sig.sigprocmask;
/* If requested, modify the current signal mask. */
if (setl != NULL) {
/* Okay, determine what we are supposed to do */
switch (how) {
/* Set the union of the current set and the signal
* set pointed to by set as the new sigprocmask.
*/
case SIG_BLOCK:
spcb->sig.sigprocmask |= set;
break;
/* Set the intersection of the current set and the
* signal set pointed to by set as the new sigprocmask.
*/
case SIG_UNBLOCK:
spcb->sig.sigprocmask &= ~(set);
break;
/* Set the signal set pointed to by set as the new sigprocmask. */
case SIG_SETMASK:
spcb->sig.sigprocmask = set;
break;
default:
ret = -EINVAL;
break;
}
/* If pending mask not in sigmask, need set sigflag. */
OsSigMaskSwitch(spcb, spcb->sig.sigprocmask);
}
SCHEDULER_UNLOCK(intSave);
if (oldset != NULL) {
retVal = LOS_ArchCopyToUser(&(oldset->sig[0]), &oldSigprocmask, sizeof(sigset_t));
if (retVal != 0) {
return -EFAULT;
}
}
return ret;
}
int OsSigProcessForeachChild(LosProcessCB *spcb, ForEachTaskCB handler, void *arg)
{
int ret;
/* Visit the main thread last (if present) */
LosTaskCB *taskCB = NULL;
LOS_DL_LIST_FOR_EACH_ENTRY(taskCB, &(spcb->threadSiblingList), LosTaskCB, threadList) {
ret = handler(taskCB, arg);
OS_RETURN_IF(ret != 0, ret);
}
return LOS_OK;
}
static int SigProcessSignalHandler(LosTaskCB *tcb, void *arg)
{
struct ProcessSignalInfo *info = (struct ProcessSignalInfo *)arg;
int ret;
int isMember;
if (tcb == NULL) {
return 0;
}
/* If the default tcb is not setted, then set this one as default. */
if (!info->defaultTcb) {
info->defaultTcb = tcb;
}
isMember = OsSigIsMember(&tcb->sig.sigwaitmask, info->sigInfo->si_signo);
if (isMember && (!info->awakenedTcb)) {
/* This means the task is waiting for this signal. Stop looking for it and use this tcb.
* The requirement is: if more than one task in this task group is waiting for the signal,
* then only one indeterminate task in the group will receive the signal.
*/
ret = OsTcbDispatch(tcb, info->sigInfo);
OS_RETURN_IF(ret < 0, ret);
/* set this tcb as awakenedTcb */
info->awakenedTcb = tcb;
OS_RETURN_IF(info->receivedTcb != NULL, SIG_STOP_VISIT); /* Stop search */
}
/* Is this signal unblocked on this thread? */
isMember = OsSigIsMember(&tcb->sig.sigprocmask, info->sigInfo->si_signo);
if ((!isMember) && (!info->receivedTcb) && (tcb != info->awakenedTcb)) {
/* if unblockedTcb of this signal is not setted, then set it. */
if (!info->unblockedTcb) {
info->unblockedTcb = tcb;
}
ret = OsTcbDispatch(tcb, info->sigInfo);
OS_RETURN_IF(ret < 0, ret);
/* set this tcb as receivedTcb */
info->receivedTcb = tcb;
OS_RETURN_IF(info->awakenedTcb != NULL, SIG_STOP_VISIT); /* Stop search */
}
return 0; /* Keep searching */
}
static int SigProcessKillSigHandler(LosTaskCB *tcb, void *arg)
{
struct ProcessSignalInfo *info = (struct ProcessSignalInfo *)arg;
return OsPendingTaskWake(tcb, info->sigInfo->si_signo);
}
static void SigProcessLoadTcb(struct ProcessSignalInfo *info, siginfo_t *sigInfo)
{
LosTaskCB *tcb = NULL;
if (info->awakenedTcb == NULL && info->receivedTcb == NULL) {
if (info->unblockedTcb) {
tcb = info->unblockedTcb;
} else if (info->defaultTcb) {
tcb = info->defaultTcb;
} else {
return;
}
/* Deliver the signal to the selected task */
(void)OsTcbDispatch(tcb, sigInfo);
}
}
int OsSigProcessSend(LosProcessCB *spcb, siginfo_t *sigInfo)
{
int ret;
struct ProcessSignalInfo info = {
.sigInfo = sigInfo,
.defaultTcb = NULL,
.unblockedTcb = NULL,
.awakenedTcb = NULL,
.receivedTcb = NULL
};
if (info.sigInfo == NULL) {
return -EFAULT;
}
/* visit all taskcb and dispatch signal */
if (info.sigInfo->si_signo == SIGKILL) {
OsSigAddSet(&spcb->sigShare, info.sigInfo->si_signo);
(void)OsSigProcessForeachChild(spcb, SigProcessKillSigHandler, &info);
return 0;
} else {
ret = OsSigProcessForeachChild(spcb, SigProcessSignalHandler, &info);
}
if (ret < 0) {
return ret;
}
SigProcessLoadTcb(&info, sigInfo);
return 0;
}
int OsSigEmptySet(sigset_t *set)
{
*set = NULL_SIGNAL_SET;
return 0;
}
/* Privilege process can't send to kernel and privilege process */
static int OsSignalPermissionToCheck(const LosProcessCB *spcb)
{
UINT32 gid = spcb->group->groupID;
if (gid == OS_KERNEL_PROCESS_GROUP) {
return -EPERM;
} else if (gid == OS_USER_PRIVILEGE_PROCESS_GROUP) {
return -EPERM;
}
return 0;
}
int OsDispatch(pid_t pid, siginfo_t *info, int permission)
{
LosProcessCB *spcb = OS_PCB_FROM_PID(pid);
if (OsProcessIsUnused(spcb)) {
return -ESRCH;
}
/* If the process you want to kill had been inactive, but still exist. should return LOS_OK */
if (OsProcessIsInactive(spcb)) {
return LOS_OK;
}
#ifdef LOSCFG_SECURITY_CAPABILITY
LosProcessCB *current = OsCurrProcessGet();
/* Kernel process always has kill permission and user process should check permission */
if (OsProcessIsUserMode(current) && !(current->processStatus & OS_PROCESS_FLAG_EXIT)) {
if ((current != spcb) && (!IsCapPermit(CAP_KILL)) && (current->user->userID != spcb->user->userID)) {
return -EPERM;
}
}
#endif
if ((permission == OS_USER_KILL_PERMISSION) && (OsSignalPermissionToCheck(spcb) < 0)) {
return -EPERM;
}
return OsSigProcessSend(spcb, info);
}
int OsKill(pid_t pid, int sig, int permission)
{
siginfo_t info;
int ret;
/* Make sure that the para is valid */
if (!GOOD_SIGNO(sig) || pid < 0) {
return -EINVAL;
}
if (OsProcessIDUserCheckInvalid(pid)) {
return -ESRCH;
}
/* Create the siginfo structure */
info.si_signo = sig;
info.si_code = SI_USER;
info.si_value.sival_ptr = NULL;
/* Send the signal */
ret = OsDispatch(pid, &info, permission);
return ret;
}
int OsKillLock(pid_t pid, int sig)
{
int ret;
unsigned int intSave;
SCHEDULER_LOCK(intSave);
ret = OsKill(pid, sig, OS_USER_KILL_PERMISSION);
SCHEDULER_UNLOCK(intSave);
return ret;
}
INT32 OsTaskKillUnsafe(UINT32 taskID, INT32 signo)
{
siginfo_t info;
LosTaskCB *taskCB = OsGetTaskCB(taskID);
INT32 ret = OsUserTaskOperatePermissionsCheck(taskCB);
if (ret != LOS_OK) {
return -ret;
}
/* Create the siginfo structure */
info.si_signo = signo;
info.si_code = SI_USER;
info.si_value.sival_ptr = NULL;
/* Dispatch the signal to thread, bypassing normal task group thread
* dispatch rules. */
return OsTcbDispatch(taskCB, &info);
}
int OsPthreadKill(UINT32 tid, int signo)
{
int ret;
UINT32 intSave;
/* Make sure that the signal is valid */
OS_RETURN_IF(!GOOD_SIGNO(signo), -EINVAL);
if (OS_TID_CHECK_INVALID(tid)) {
return -ESRCH;
}
/* Keep things stationary through the following */
SCHEDULER_LOCK(intSave);
ret = OsTaskKillUnsafe(tid, signo);
SCHEDULER_UNLOCK(intSave);
return ret;
}
int OsSigAddSet(sigset_t *set, int signo)
{
/* Verify the signal */
if (!GOOD_SIGNO(signo)) {
return -EINVAL;
} else {
/* In musl, sig No bits 00000100 present sig No 3, but 1<< 3 = 00001000, so signo needs minus 1 */
signo -= 1;
/* Add the signal to the set */
*set |= SIGNO2SET((unsigned int)signo);
return LOS_OK;
}
}
int OsSigPending(sigset_t *set)
{
LosTaskCB *tcb = NULL;
unsigned int intSave;
if (set == NULL) {
return -EFAULT;
}
SCHEDULER_LOCK(intSave);
tcb = OsCurrTaskGet();
*set = tcb->sig.sigPendFlag;
SCHEDULER_UNLOCK(intSave);
return LOS_OK;
}
STATIC int FindFirstSetedBit(UINT64 n)
{
int count;
if (n == 0) {
return -1;
}
for (count = 0; (count < UINT64_BIT_SIZE) && (n ^ 1ULL); n >>= 1, count++) {}
return (count < UINT64_BIT_SIZE) ? count : (-1);
}
int OsSigTimedWaitNoLock(sigset_t *set, siginfo_t *info, unsigned int timeout)
{
LosTaskCB *task = NULL;
sig_cb *sigcb = NULL;
int ret;
task = OsCurrTaskGet();
sigcb = &task->sig;
if (sigcb->waitList.pstNext == NULL) {
LOS_ListInit(&sigcb->waitList);
}
/* If pendingflag & set > 0, shound clear pending flag */
sigset_t clear = sigcb->sigPendFlag & *set;
if (clear) {
sigcb->sigPendFlag ^= clear;
ret = FindFirstSetedBit((UINT64)clear) + 1;
} else {
OsSigAddSet(set, SIGKILL);
OsSigAddSet(set, SIGSTOP);
sigcb->sigwaitmask |= *set;
OsTaskWaitSetPendMask(OS_TASK_WAIT_SIGNAL, sigcb->sigwaitmask, timeout);
ret = OsSchedTaskWait(&sigcb->waitList, timeout, TRUE);
if (ret == LOS_ERRNO_TSK_TIMEOUT) {
ret = -EAGAIN;
}
sigcb->sigwaitmask = NULL_SIGNAL_SET;
}
if (info != NULL) {
(void) memcpy_s(info, sizeof(siginfo_t), &sigcb->sigunbinfo, sizeof(siginfo_t));
}
return ret;
}
int OsSigTimedWait(sigset_t *set, siginfo_t *info, unsigned int timeout)
{
int ret;
unsigned int intSave;
SCHEDULER_LOCK(intSave);
ret = OsSigTimedWaitNoLock(set, info, timeout);
SCHEDULER_UNLOCK(intSave);
return ret;
}
int OsPause(void)
{
LosTaskCB *spcb = NULL;
sigset_t oldSigprocmask;
spcb = OsCurrTaskGet();
oldSigprocmask = spcb->sig.sigprocmask;
return OsSigSuspend(&oldSigprocmask);
}
int OsSigSuspend(const sigset_t *set)
{
unsigned int intSave;
LosTaskCB *rtcb = NULL;
sigset_t setSuspend;
int ret;
if (set == NULL) {
return -EINVAL;
}
SCHEDULER_LOCK(intSave);
rtcb = OsCurrTaskGet();
/* Wait signal calc */
setSuspend = FULL_SIGNAL_SET & (~(*set));
/* If pending mask not in sigmask, need set sigflag */
OsSigMaskSwitch(rtcb, *set);
ret = OsSigTimedWaitNoLock(&setSuspend, NULL, LOS_WAIT_FOREVER);
if (ret < 0) {
PRINT_ERR("FUNC %s LINE = %d, ret = %x\n", __FUNCTION__, __LINE__, ret);
}
SCHEDULER_UNLOCK(intSave);
return -EINTR;
}
int OsSigAction(int sig, const sigaction_t *act, sigaction_t *oact)
{
UINTPTR addr;
sigaction_t action;
if (!GOOD_SIGNO(sig) || sig < 1 || act == NULL) {
return -EINVAL;
}
if (LOS_ArchCopyFromUser(&action, act, sizeof(sigaction_t)) != LOS_OK) {
return -EFAULT;
}
if (sig == SIGSYS) {
addr = OsGetSigHandler();
if (addr == 0) {
OsSetSigHandler((unsigned long)(UINTPTR)action.sa_handler);
return LOS_OK;
}
return -EINVAL;
}
return LOS_OK;
}
VOID OsSigIntLock(VOID)
{
LosTaskCB *task = OsCurrTaskGet();
sig_cb *sigcb = &task->sig;
(VOID)LOS_AtomicAdd((Atomic *)&sigcb->sigIntLock, 1);
}
VOID OsSigIntUnlock(VOID)
{
LosTaskCB *task = OsCurrTaskGet();
sig_cb *sigcb = &task->sig;
(VOID)LOS_AtomicSub((Atomic *)&sigcb->sigIntLock, 1);
}
VOID *OsSaveSignalContext(VOID *sp, VOID *newSp)
{
UINTPTR sigHandler;
UINT32 intSave;
LosTaskCB *task = OsCurrTaskGet();
LosProcessCB *process = OsCurrProcessGet();
sig_cb *sigcb = &task->sig;
/* A thread is not allowed to interrupt the processing of its signals during a system call */
if (sigcb->sigIntLock > 0) {
return sp;
}
if (task->taskStatus & OS_TASK_FLAG_EXIT_KILL) {
OsTaskToExit(task, 0);
return sp;
}
SCHEDULER_LOCK(intSave);
if ((sigcb->count == 0) && ((sigcb->sigFlag != 0) || (process->sigShare != 0))) {
sigHandler = OsGetSigHandler();
if (sigHandler == 0) {
sigcb->sigFlag = 0;
process->sigShare = 0;
SCHEDULER_UNLOCK(intSave);
PRINT_ERR("The signal processing function for the current process pid =%d is NULL!\n", task->processID);
return sp;
}
/* One pthread do the share signal */
sigcb->sigFlag |= process->sigShare;
UINT32 signo = (UINT32)FindFirstSetedBit(sigcb->sigFlag) + 1;
UINT32 sigVal = (UINT32)(UINTPTR)(sigcb->sigunbinfo.si_value.sival_ptr);
OsProcessExitCodeSignalSet(process, signo);
sigcb->sigContext = sp;
OsInitSignalContext(sp, newSp, sigHandler, signo, sigVal);
/* sig No bits 00000100 present sig No 3, but 1<< 3 = 00001000, so signo needs minus 1 */
sigcb->sigFlag ^= 1ULL << (signo - 1);
sigcb->count++;
SCHEDULER_UNLOCK(intSave);
return newSp;
}
SCHEDULER_UNLOCK(intSave);
return sp;
}
VOID *OsRestorSignalContext(VOID *sp)
{
UINT32 intSave;
LosTaskCB *task = OsCurrTaskGet();
sig_cb *sigcb = &task->sig;
SCHEDULER_LOCK(intSave);
if (sigcb->count != 1) {
SCHEDULER_UNLOCK(intSave);
PRINT_ERR("sig error count : %d\n", sigcb->count);
return sp;
}
LosProcessCB *process = OsCurrProcessGet();
VOID *saveContext = sigcb->sigContext;
sigcb->sigContext = NULL;
sigcb->count--;
process->sigShare = 0;
OsProcessExitCodeSignalClear(process);
SCHEDULER_UNLOCK(intSave);
return saveContext;
}
#endif
Reference in New Issue View Git Blame Copy Permalink