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Diffstat (limited to 'ipc')
-rw-r--r--ipc/msg.c389
1 files changed, 205 insertions, 184 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index cd92d342953e..2b4fccf8ea55 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -1,6 +1,6 @@
/*
* linux/ipc/msg.c
- * Copyright (C) 1992 Krishna Balasubramanian
+ * Copyright (C) 1992 Krishna Balasubramanian
*
* Removed all the remaining kerneld mess
* Catch the -EFAULT stuff properly
@@ -41,22 +41,24 @@ int msg_ctlmax = MSGMAX;
int msg_ctlmnb = MSGMNB;
int msg_ctlmni = MSGMNI;
-/* one msg_receiver structure for each sleeping receiver */
+/*
+ * one msg_receiver structure for each sleeping receiver:
+ */
struct msg_receiver {
- struct list_head r_list;
- struct task_struct* r_tsk;
+ struct list_head r_list;
+ struct task_struct *r_tsk;
- int r_mode;
- long r_msgtype;
- long r_maxsize;
+ int r_mode;
+ long r_msgtype;
+ long r_maxsize;
- struct msg_msg* volatile r_msg;
+ volatile struct msg_msg *r_msg;
};
/* one msg_sender for each sleeping sender */
struct msg_sender {
- struct list_head list;
- struct task_struct* tsk;
+ struct list_head list;
+ struct task_struct *tsk;
};
#define SEARCH_ANY 1
@@ -64,45 +66,42 @@ struct msg_sender {
#define SEARCH_NOTEQUAL 3
#define SEARCH_LESSEQUAL 4
-static atomic_t msg_bytes = ATOMIC_INIT(0);
-static atomic_t msg_hdrs = ATOMIC_INIT(0);
+static atomic_t msg_bytes = ATOMIC_INIT(0);
+static atomic_t msg_hdrs = ATOMIC_INIT(0);
static struct ipc_ids msg_ids;
-#define msg_lock(id) ((struct msg_queue*)ipc_lock(&msg_ids,id))
-#define msg_unlock(msq) ipc_unlock(&(msq)->q_perm)
-#define msg_rmid(id) ((struct msg_queue*)ipc_rmid(&msg_ids,id))
-#define msg_checkid(msq, msgid) \
- ipc_checkid(&msg_ids,&msq->q_perm,msgid)
-#define msg_buildid(id, seq) \
- ipc_buildid(&msg_ids, id, seq)
+#define msg_lock(id) ((struct msg_queue *)ipc_lock(&msg_ids, id))
+#define msg_unlock(msq) ipc_unlock(&(msq)->q_perm)
+#define msg_rmid(id) ((struct msg_queue *)ipc_rmid(&msg_ids, id))
+#define msg_checkid(msq, msgid) ipc_checkid(&msg_ids, &msq->q_perm, msgid)
+#define msg_buildid(id, seq) ipc_buildid(&msg_ids, id, seq)
-static void freeque (struct msg_queue *msq, int id);
-static int newque (key_t key, int msgflg);
+static void freeque(struct msg_queue *msq, int id);
+static int newque(key_t key, int msgflg);
#ifdef CONFIG_PROC_FS
static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
#endif
-void __init msg_init (void)
+void __init msg_init(void)
{
- ipc_init_ids(&msg_ids,msg_ctlmni);
+ ipc_init_ids(&msg_ids, msg_ctlmni);
ipc_init_proc_interface("sysvipc/msg",
" key msqid perms cbytes qnum lspid lrpid uid gid cuid cgid stime rtime ctime\n",
&msg_ids,
sysvipc_msg_proc_show);
}
-static int newque (key_t key, int msgflg)
+static int newque(key_t key, int msgflg)
{
- int id;
- int retval;
struct msg_queue *msq;
+ int id, retval;
- msq = ipc_rcu_alloc(sizeof(*msq));
- if (!msq)
+ msq = ipc_rcu_alloc(sizeof(*msq));
+ if (!msq)
return -ENOMEM;
- msq->q_perm.mode = (msgflg & S_IRWXUGO);
+ msq->q_perm.mode = msgflg & S_IRWXUGO;
msq->q_perm.key = key;
msq->q_perm.security = NULL;
@@ -113,13 +112,13 @@ static int newque (key_t key, int msgflg)
}
id = ipc_addid(&msg_ids, &msq->q_perm, msg_ctlmni);
- if(id == -1) {
+ if (id == -1) {
security_msg_queue_free(msq);
ipc_rcu_putref(msq);
return -ENOSPC;
}
- msq->q_id = msg_buildid(id,msq->q_perm.seq);
+ msq->q_id = msg_buildid(id, msq->q_perm.seq);
msq->q_stime = msq->q_rtime = 0;
msq->q_ctime = get_seconds();
msq->q_cbytes = msq->q_qnum = 0;
@@ -133,44 +132,44 @@ static int newque (key_t key, int msgflg)
return msq->q_id;
}
-static inline void ss_add(struct msg_queue* msq, struct msg_sender* mss)
+static inline void ss_add(struct msg_queue *msq, struct msg_sender *mss)
{
- mss->tsk=current;
- current->state=TASK_INTERRUPTIBLE;
- list_add_tail(&mss->list,&msq->q_senders);
+ mss->tsk = current;
+ current->state = TASK_INTERRUPTIBLE;
+ list_add_tail(&mss->list, &msq->q_senders);
}
-static inline void ss_del(struct msg_sender* mss)
+static inline void ss_del(struct msg_sender *mss)
{
- if(mss->list.next != NULL)
+ if (mss->list.next != NULL)
list_del(&mss->list);
}
-static void ss_wakeup(struct list_head* h, int kill)
+static void ss_wakeup(struct list_head *h, int kill)
{
struct list_head *tmp;
tmp = h->next;
while (tmp != h) {
- struct msg_sender* mss;
-
- mss = list_entry(tmp,struct msg_sender,list);
+ struct msg_sender *mss;
+
+ mss = list_entry(tmp, struct msg_sender, list);
tmp = tmp->next;
- if(kill)
- mss->list.next=NULL;
+ if (kill)
+ mss->list.next = NULL;
wake_up_process(mss->tsk);
}
}
-static void expunge_all(struct msg_queue* msq, int res)
+static void expunge_all(struct msg_queue *msq, int res)
{
struct list_head *tmp;
tmp = msq->q_receivers.next;
while (tmp != &msq->q_receivers) {
- struct msg_receiver* msr;
-
- msr = list_entry(tmp,struct msg_receiver,r_list);
+ struct msg_receiver *msr;
+
+ msr = list_entry(tmp, struct msg_receiver, r_list);
tmp = tmp->next;
msr->r_msg = NULL;
wake_up_process(msr->r_tsk);
@@ -178,26 +177,28 @@ static void expunge_all(struct msg_queue* msq, int res)
msr->r_msg = ERR_PTR(res);
}
}
-/*
- * freeque() wakes up waiters on the sender and receiver waiting queue,
- * removes the message queue from message queue ID
+
+/*
+ * freeque() wakes up waiters on the sender and receiver waiting queue,
+ * removes the message queue from message queue ID
* array, and cleans up all the messages associated with this queue.
*
* msg_ids.mutex and the spinlock for this message queue is hold
* before freeque() is called. msg_ids.mutex remains locked on exit.
*/
-static void freeque (struct msg_queue *msq, int id)
+static void freeque(struct msg_queue *msq, int id)
{
struct list_head *tmp;
- expunge_all(msq,-EIDRM);
- ss_wakeup(&msq->q_senders,1);
+ expunge_all(msq, -EIDRM);
+ ss_wakeup(&msq->q_senders, 1);
msq = msg_rmid(id);
msg_unlock(msq);
-
+
tmp = msq->q_messages.next;
- while(tmp != &msq->q_messages) {
- struct msg_msg* msg = list_entry(tmp,struct msg_msg,m_list);
+ while (tmp != &msq->q_messages) {
+ struct msg_msg *msg = list_entry(tmp, struct msg_msg, m_list);
+
tmp = tmp->next;
atomic_dec(&msg_hdrs);
free_msg(msg);
@@ -207,10 +208,10 @@ static void freeque (struct msg_queue *msq, int id)
ipc_rcu_putref(msq);
}
-asmlinkage long sys_msgget (key_t key, int msgflg)
+asmlinkage long sys_msgget(key_t key, int msgflg)
{
- int id, ret = -EPERM;
struct msg_queue *msq;
+ int id, ret = -EPERM;
mutex_lock(&msg_ids.mutex);
if (key == IPC_PRIVATE)
@@ -224,31 +225,34 @@ asmlinkage long sys_msgget (key_t key, int msgflg)
ret = -EEXIST;
} else {
msq = msg_lock(id);
- BUG_ON(msq==NULL);
+ BUG_ON(msq == NULL);
if (ipcperms(&msq->q_perm, msgflg))
ret = -EACCES;
else {
int qid = msg_buildid(id, msq->q_perm.seq);
- ret = security_msg_queue_associate(msq, msgflg);
+
+ ret = security_msg_queue_associate(msq, msgflg);
if (!ret)
ret = qid;
}
msg_unlock(msq);
}
mutex_unlock(&msg_ids.mutex);
+
return ret;
}
-static inline unsigned long copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
+static inline unsigned long
+copy_msqid_to_user(void __user *buf, struct msqid64_ds *in, int version)
{
switch(version) {
case IPC_64:
- return copy_to_user (buf, in, sizeof(*in));
+ return copy_to_user(buf, in, sizeof(*in));
case IPC_OLD:
- {
+ {
struct msqid_ds out;
- memset(&out,0,sizeof(out));
+ memset(&out, 0, sizeof(out));
ipc64_perm_to_ipc_perm(&in->msg_perm, &out.msg_perm);
@@ -256,18 +260,18 @@ static inline unsigned long copy_msqid_to_user(void __user *buf, struct msqid64_
out.msg_rtime = in->msg_rtime;
out.msg_ctime = in->msg_ctime;
- if(in->msg_cbytes > USHRT_MAX)
+ if (in->msg_cbytes > USHRT_MAX)
out.msg_cbytes = USHRT_MAX;
else
out.msg_cbytes = in->msg_cbytes;
out.msg_lcbytes = in->msg_cbytes;
- if(in->msg_qnum > USHRT_MAX)
+ if (in->msg_qnum > USHRT_MAX)
out.msg_qnum = USHRT_MAX;
else
out.msg_qnum = in->msg_qnum;
- if(in->msg_qbytes > USHRT_MAX)
+ if (in->msg_qbytes > USHRT_MAX)
out.msg_qbytes = USHRT_MAX;
else
out.msg_qbytes = in->msg_qbytes;
@@ -276,8 +280,8 @@ static inline unsigned long copy_msqid_to_user(void __user *buf, struct msqid64_
out.msg_lspid = in->msg_lspid;
out.msg_lrpid = in->msg_lrpid;
- return copy_to_user (buf, &out, sizeof(out));
- }
+ return copy_to_user(buf, &out, sizeof(out));
+ }
default:
return -EINVAL;
}
@@ -290,14 +294,15 @@ struct msq_setbuf {
mode_t mode;
};
-static inline unsigned long copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version)
+static inline unsigned long
+copy_msqid_from_user(struct msq_setbuf *out, void __user *buf, int version)
{
switch(version) {
case IPC_64:
- {
+ {
struct msqid64_ds tbuf;
- if (copy_from_user (&tbuf, buf, sizeof (tbuf)))
+ if (copy_from_user(&tbuf, buf, sizeof(tbuf)))
return -EFAULT;
out->qbytes = tbuf.msg_qbytes;
@@ -306,60 +311,61 @@ static inline unsigned long copy_msqid_from_user(struct msq_setbuf *out, void __
out->mode = tbuf.msg_perm.mode;
return 0;
- }
+ }
case IPC_OLD:
- {
+ {
struct msqid_ds tbuf_old;
- if (copy_from_user (&tbuf_old, buf, sizeof (tbuf_old)))
+ if (copy_from_user(&tbuf_old, buf, sizeof(tbuf_old)))
return -EFAULT;
out->uid = tbuf_old.msg_perm.uid;
out->gid = tbuf_old.msg_perm.gid;
out->mode = tbuf_old.msg_perm.mode;
- if(tbuf_old.msg_qbytes == 0)
+ if (tbuf_old.msg_qbytes == 0)
out->qbytes = tbuf_old.msg_lqbytes;
else
out->qbytes = tbuf_old.msg_qbytes;
return 0;
- }
+ }
default:
return -EINVAL;
}
}
-asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
+asmlinkage long sys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf)
{
- int err, version;
- struct msg_queue *msq;
- struct msq_setbuf setbuf;
struct kern_ipc_perm *ipcp;
-
+ struct msq_setbuf setbuf;
+ struct msg_queue *msq;
+ int err, version;
+
if (msqid < 0 || cmd < 0)
return -EINVAL;
version = ipc_parse_version(&cmd);
switch (cmd) {
- case IPC_INFO:
- case MSG_INFO:
- {
+ case IPC_INFO:
+ case MSG_INFO:
+ {
struct msginfo msginfo;
int max_id;
+
if (!buf)
return -EFAULT;
- /* We must not return kernel stack data.
+ /*
+ * We must not return kernel stack data.
* due to padding, it's not enough
* to set all member fields.
*/
-
err = security_msg_queue_msgctl(NULL, cmd);
if (err)
return err;
- memset(&msginfo,0,sizeof(msginfo));
+ memset(&msginfo, 0, sizeof(msginfo));
msginfo.msgmni = msg_ctlmni;
msginfo.msgmax = msg_ctlmax;
msginfo.msgmnb = msg_ctlmnb;
@@ -377,36 +383,37 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
}
max_id = msg_ids.max_id;
mutex_unlock(&msg_ids.mutex);
- if (copy_to_user (buf, &msginfo, sizeof(struct msginfo)))
+ if (copy_to_user(buf, &msginfo, sizeof(struct msginfo)))
return -EFAULT;
- return (max_id < 0) ? 0: max_id;
+ return (max_id < 0) ? 0 : max_id;
}
case MSG_STAT:
case IPC_STAT:
{
struct msqid64_ds tbuf;
int success_return;
+
if (!buf)
return -EFAULT;
- if(cmd == MSG_STAT && msqid >= msg_ids.entries->size)
+ if (cmd == MSG_STAT && msqid >= msg_ids.entries->size)
return -EINVAL;
- memset(&tbuf,0,sizeof(tbuf));
+ memset(&tbuf, 0, sizeof(tbuf));
msq = msg_lock(msqid);
if (msq == NULL)
return -EINVAL;
- if(cmd == MSG_STAT) {
+ if (cmd == MSG_STAT) {
success_return = msg_buildid(msqid, msq->q_perm.seq);
} else {
err = -EIDRM;
- if (msg_checkid(msq,msqid))
+ if (msg_checkid(msq, msqid))
goto out_unlock;
success_return = 0;
}
err = -EACCES;
- if (ipcperms (&msq->q_perm, S_IRUGO))
+ if (ipcperms(&msq->q_perm, S_IRUGO))
goto out_unlock;
err = security_msg_queue_msgctl(msq, cmd);
@@ -430,7 +437,7 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
case IPC_SET:
if (!buf)
return -EFAULT;
- if (copy_msqid_from_user (&setbuf, buf, version))
+ if (copy_msqid_from_user(&setbuf, buf, version))
return -EFAULT;
break;
case IPC_RMID:
@@ -441,12 +448,12 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
mutex_lock(&msg_ids.mutex);
msq = msg_lock(msqid);
- err=-EINVAL;
+ err = -EINVAL;
if (msq == NULL)
goto out_up;
err = -EIDRM;
- if (msg_checkid(msq,msqid))
+ if (msg_checkid(msq, msqid))
goto out_unlock_up;
ipcp = &msq->q_perm;
@@ -454,15 +461,16 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
if (err)
goto out_unlock_up;
if (cmd==IPC_SET) {
- err = audit_ipc_set_perm(setbuf.qbytes, setbuf.uid, setbuf.gid, setbuf.mode);
+ err = audit_ipc_set_perm(setbuf.qbytes, setbuf.uid, setbuf.gid,
+ setbuf.mode);
if (err)
goto out_unlock_up;
}
err = -EPERM;
- if (current->euid != ipcp->cuid &&
+ if (current->euid != ipcp->cuid &&
current->euid != ipcp->uid && !capable(CAP_SYS_ADMIN))
- /* We _could_ check for CAP_CHOWN above, but we don't */
+ /* We _could_ check for CAP_CHOWN above, but we don't */
goto out_unlock_up;
err = security_msg_queue_msgctl(msq, cmd);
@@ -480,22 +488,22 @@ asmlinkage long sys_msgctl (int msqid, int cmd, struct msqid_ds __user *buf)
ipcp->uid = setbuf.uid;
ipcp->gid = setbuf.gid;
- ipcp->mode = (ipcp->mode & ~S_IRWXUGO) |
- (S_IRWXUGO & setbuf.mode);
+ ipcp->mode = (ipcp->mode & ~S_IRWXUGO) |
+ (S_IRWXUGO & setbuf.mode);
msq->q_ctime = get_seconds();
/* sleeping receivers might be excluded by
* stricter permissions.
*/
- expunge_all(msq,-EAGAIN);
+ expunge_all(msq, -EAGAIN);
/* sleeping senders might be able to send
* due to a larger queue size.
*/
- ss_wakeup(&msq->q_senders,0);
+ ss_wakeup(&msq->q_senders, 0);
msg_unlock(msq);
break;
}
case IPC_RMID:
- freeque (msq, msqid);
+ freeque(msq, msqid);
break;
}
err = 0;
@@ -510,41 +518,44 @@ out_unlock:
return err;
}
-static int testmsg(struct msg_msg* msg,long type,int mode)
+static int testmsg(struct msg_msg *msg, long type, int mode)
{
switch(mode)
{
case SEARCH_ANY:
return 1;
case SEARCH_LESSEQUAL:
- if(msg->m_type <=type)
+ if (msg->m_type <=type)
return 1;
break;
case SEARCH_EQUAL:
- if(msg->m_type == type)
+ if (msg->m_type == type)
return 1;
break;
case SEARCH_NOTEQUAL:
- if(msg->m_type != type)
+ if (msg->m_type != type)
return 1;
break;
}
return 0;
}
-static inline int pipelined_send(struct msg_queue* msq, struct msg_msg* msg)
+static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
{
- struct list_head* tmp;
+ struct list_head *tmp;
tmp = msq->q_receivers.next;
while (tmp != &msq->q_receivers) {
- struct msg_receiver* msr;
- msr = list_entry(tmp,struct msg_receiver,r_list);
+ struct msg_receiver *msr;
+
+ msr = list_entry(tmp, struct msg_receiver, r_list);
tmp = tmp->next;
- if(testmsg(msg,msr->r_msgtype,msr->r_mode) &&
- !security_msg_queue_msgrcv(msq, msg, msr->r_tsk, msr->r_msgtype, msr->r_mode)) {
+ if (testmsg(msg, msr->r_msgtype, msr->r_mode) &&
+ !security_msg_queue_msgrcv(msq, msg, msr->r_tsk,
+ msr->r_msgtype, msr->r_mode)) {
+
list_del(&msr->r_list);
- if(msr->r_maxsize < msg->m_ts) {
+ if (msr->r_maxsize < msg->m_ts) {
msr->r_msg = NULL;
wake_up_process(msr->r_tsk);
smp_mb();
@@ -556,6 +567,7 @@ static inline int pipelined_send(struct msg_queue* msq, struct msg_msg* msg)
wake_up_process(msr->r_tsk);
smp_mb();
msr->r_msg = msg;
+
return 1;
}
}
@@ -563,40 +575,41 @@ static inline int pipelined_send(struct msg_queue* msq, struct msg_msg* msg)
return 0;
}
-asmlinkage long sys_msgsnd (int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg)
+asmlinkage long
+sys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz, int msgflg)
{
struct msg_queue *msq;
struct msg_msg *msg;
long mtype;
int err;
-
+
if (msgsz > msg_ctlmax || (long) msgsz < 0 || msqid < 0)
return -EINVAL;
if (get_user(mtype, &msgp->mtype))
- return -EFAULT;
+ return -EFAULT;
if (mtype < 1)
return -EINVAL;
msg = load_msg(msgp->mtext, msgsz);
- if(IS_ERR(msg))
+ if (IS_ERR(msg))
return PTR_ERR(msg);
msg->m_type = mtype;
msg->m_ts = msgsz;
msq = msg_lock(msqid);
- err=-EINVAL;
- if(msq==NULL)
+ err = -EINVAL;
+ if (msq == NULL)
goto out_free;
err= -EIDRM;
- if (msg_checkid(msq,msqid))
+ if (msg_checkid(msq, msqid))
goto out_unlock_free;
for (;;) {
struct msg_sender s;
- err=-EACCES;
+ err = -EACCES;
if (ipcperms(&msq->q_perm, S_IWUGO))
goto out_unlock_free;
@@ -604,14 +617,14 @@ asmlinkage long sys_msgsnd (int msqid, struct msgbuf __user *msgp, size_t msgsz,
if (err)
goto out_unlock_free;
- if(msgsz + msq->q_cbytes <= msq->q_qbytes &&
+ if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
1 + msq->q_qnum <= msq->q_qbytes) {
break;
}
/* queue full, wait: */
- if(msgflg&IPC_NOWAIT) {
- err=-EAGAIN;
+ if (msgflg & IPC_NOWAIT) {
+ err = -EAGAIN;
goto out_unlock_free;
}
ss_add(msq, &s);
@@ -626,9 +639,9 @@ asmlinkage long sys_msgsnd (int msqid, struct msgbuf __user *msgp, size_t msgsz,
goto out_unlock_free;
}
ss_del(&s);
-
+
if (signal_pending(current)) {
- err=-ERESTARTNOHAND;
+ err = -ERESTARTNOHAND;
goto out_unlock_free;
}
}
@@ -636,47 +649,47 @@ asmlinkage long sys_msgsnd (int msqid, struct msgbuf __user *msgp, size_t msgsz,
msq->q_lspid = current->tgid;
msq->q_stime = get_seconds();
- if(!pipelined_send(msq,msg)) {
+ if (!pipelined_send(msq, msg)) {
/* noone is waiting for this message, enqueue it */
- list_add_tail(&msg->m_list,&msq->q_messages);
+ list_add_tail(&msg->m_list, &msq->q_messages);
msq->q_cbytes += msgsz;
msq->q_qnum++;
- atomic_add(msgsz,&msg_bytes);
+ atomic_add(msgsz, &msg_bytes);
atomic_inc(&msg_hdrs);
}
-
+
err = 0;
msg = NULL;
out_unlock_free:
msg_unlock(msq);
out_free:
- if(msg!=NULL)
+ if (msg != NULL)
free_msg(msg);
return err;
}
-static inline int convert_mode(long* msgtyp, int msgflg)
+static inline int convert_mode(long *msgtyp, int msgflg)
{
- /*
+ /*
* find message of correct type.
* msgtyp = 0 => get first.
* msgtyp > 0 => get first message of matching type.
- * msgtyp < 0 => get message with least type must be < abs(msgtype).
+ * msgtyp < 0 => get message with least type must be < abs(msgtype).
*/
- if(*msgtyp==0)
+ if (*msgtyp == 0)
return SEARCH_ANY;
- if(*msgtyp<0) {
- *msgtyp=-(*msgtyp);
+ if (*msgtyp < 0) {
+ *msgtyp = -*msgtyp;
return SEARCH_LESSEQUAL;
}
- if(msgflg & MSG_EXCEPT)
+ if (msgflg & MSG_EXCEPT)
return SEARCH_NOTEQUAL;
return SEARCH_EQUAL;
}
-asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz,
- long msgtyp, int msgflg)
+asmlinkage long sys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
+ long msgtyp, int msgflg)
{
struct msg_queue *msq;
struct msg_msg *msg;
@@ -684,44 +697,51 @@ asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz,
if (msqid < 0 || (long) msgsz < 0)
return -EINVAL;
- mode = convert_mode(&msgtyp,msgflg);
+ mode = convert_mode(&msgtyp, msgflg);
msq = msg_lock(msqid);
- if(msq==NULL)
+ if (msq == NULL)
return -EINVAL;
msg = ERR_PTR(-EIDRM);
- if (msg_checkid(msq,msqid))
+ if (msg_checkid(msq, msqid))
goto out_unlock;
for (;;) {
struct msg_receiver msr_d;
- struct list_head* tmp;
+ struct list_head *tmp;
msg = ERR_PTR(-EACCES);
- if (ipcperms (&msq->q_perm, S_IRUGO))
+ if (ipcperms(&msq->q_perm, S_IRUGO))
goto out_unlock;
msg = ERR_PTR(-EAGAIN);
tmp = msq->q_messages.next;
while (tmp != &msq->q_messages) {
struct msg_msg *walk_msg;
- walk_msg = list_entry(tmp,struct msg_msg,m_list);
- if(testmsg(walk_msg,msgtyp,mode) &&
- !security_msg_queue_msgrcv(msq, walk_msg, current, msgtyp, mode)) {
+
+ walk_msg = list_entry(tmp, struct msg_msg, m_list);
+ if (testmsg(walk_msg, msgtyp, mode) &&
+ !security_msg_queue_msgrcv(msq, walk_msg, current,
+ msgtyp, mode)) {
+
msg = walk_msg;
- if(mode == SEARCH_LESSEQUAL && walk_msg->m_type != 1) {
- msg=walk_msg;
- msgtyp=walk_msg->m_type-1;
+ if (mode == SEARCH_LESSEQUAL &&
+ walk_msg->m_type != 1) {
+ msg = walk_msg;
+ msgtyp = walk_msg->m_type - 1;
} else {
- msg=walk_msg;
+ msg = walk_msg;
break;
}
}
tmp = tmp->next;
}
- if(!IS_ERR(msg)) {
- /* Found a suitable message. Unlink it from the queue. */
+ if (!IS_ERR(msg)) {
+ /*
+ * Found a suitable message.
+ * Unlink it from the queue.
+ */
if ((msgsz < msg->m_ts) && !(msgflg & MSG_NOERROR)) {
msg = ERR_PTR(-E2BIG);
goto out_unlock;
@@ -731,9 +751,9 @@ asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz,
msq->q_rtime = get_seconds();
msq->q_lrpid = current->tgid;
msq->q_cbytes -= msg->m_ts;
- atomic_sub(msg->m_ts,&msg_bytes);
+ atomic_sub(msg->m_ts, &msg_bytes);
atomic_dec(&msg_hdrs);
- ss_wakeup(&msq->q_senders,0);
+ ss_wakeup(&msq->q_senders, 0);
msg_unlock(msq);
break;
}
@@ -742,13 +762,13 @@ asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz,
msg = ERR_PTR(-ENOMSG);
goto out_unlock;
}
- list_add_tail(&msr_d.r_list,&msq->q_receivers);
+ list_add_tail(&msr_d.r_list, &msq->q_receivers);
msr_d.r_tsk = current;
msr_d.r_msgtype = msgtyp;
msr_d.r_mode = mode;
- if(msgflg & MSG_NOERROR)
+ if (msgflg & MSG_NOERROR)
msr_d.r_maxsize = INT_MAX;
- else
+ else
msr_d.r_maxsize = msgsz;
msr_d.r_msg = ERR_PTR(-EAGAIN);
current->state = TASK_INTERRUPTIBLE;
@@ -773,17 +793,17 @@ asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz,
* wake_up_process(). There is a race with exit(), see
* ipc/mqueue.c for the details.
*/
- msg = (struct msg_msg*) msr_d.r_msg;
+ msg = (struct msg_msg*)msr_d.r_msg;
while (msg == NULL) {
cpu_relax();
- msg = (struct msg_msg*) msr_d.r_msg;
+ msg = (struct msg_msg *)msr_d.r_msg;
}
/* Lockless receive, part 3:
* If there is a message or an error then accept it without
* locking.
*/
- if(msg != ERR_PTR(-EAGAIN)) {
+ if (msg != ERR_PTR(-EAGAIN)) {
rcu_read_unlock();
break;
}
@@ -798,7 +818,7 @@ asmlinkage long sys_msgrcv (int msqid, struct msgbuf __user *msgp, size_t msgsz,
* Repeat test after acquiring the spinlock.
*/
msg = (struct msg_msg*)msr_d.r_msg;
- if(msg != ERR_PTR(-EAGAIN))
+ if (msg != ERR_PTR(-EAGAIN))
goto out_unlock;
list_del(&msr_d.r_list);
@@ -810,14 +830,15 @@ out_unlock:
}
}
if (IS_ERR(msg))
- return PTR_ERR(msg);
+ return PTR_ERR(msg);
msgsz = (msgsz > msg->m_ts) ? msg->m_ts : msgsz;
if (put_user (msg->m_type, &msgp->mtype) ||
store_msg(msgp->mtext, msg, msgsz)) {
- msgsz = -EFAULT;
+ msgsz = -EFAULT;
}
free_msg(msg);
+
return msgsz;
}
@@ -827,20 +848,20 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
struct msg_queue *msq = it;
return seq_printf(s,
- "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
- msq->q_perm.key,
- msq->q_id,
- msq->q_perm.mode,
- msq->q_cbytes,
- msq->q_qnum,
- msq->q_lspid,
- msq->q_lrpid,
- msq->q_perm.uid,
- msq->q_perm.gid,
- msq->q_perm.cuid,
- msq->q_perm.cgid,
- msq->q_stime,
- msq->q_rtime,
- msq->q_ctime);
+ "%10d %10d %4o %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
+ msq->q_perm.key,
+ msq->q_id,
+ msq->q_perm.mode,
+ msq->q_cbytes,
+ msq->q_qnum,
+ msq->q_lspid,
+ msq->q_lrpid,
+ msq->q_perm.uid,
+ msq->q_perm.gid,
+ msq->q_perm.cuid,
+ msq->q_perm.cgid,
+ msq->q_stime,
+ msq->q_rtime,
+ msq->q_ctime);
}
#endif
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-18 10:49:18 +0000