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全部话题 - 话题: call
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y*********k
发帖数: 673
1
来自主题: Stock版 - 一个卖option call的问题
有个卖option call的问题想请教大牛。
有些大牛说,每个星期都卖一些blue chip stocks OTM call来获得一些稳定的收入.
可是,如果你卖deep OTM call, premium少的可怜;如果你卖不那么deep的OTM或者ATM
call, 一旦股票涨了,你的call就会被执行,那岂不是亏了?
请大牛指点
M********n
发帖数: 4650
2
来自主题: Stock版 - 请教 被 day trade call 了
收到如下email:
This email is to inform you that your account XXXX-XXXX has a day trade call
for $xxx.xx; the cash is due 1/26/15. This was issued due to opening
transactions exceeding your day trading buying power at a specific moment on
1/16/15 by the above mentioned amount.
While the account is in a day trade call, for 90 days from the cash due date
, day trading is not permitted. Also, your account will be limited to stock
buying power for online trades.
You can cover the day trade call by dep... 阅读全帖
S********y
发帖数: 127
3
三天前刚开了个TD Ameritrade 账户,当时转帐存入$2000,花了$1000左右买了只股票
(2-5/share), 还有现金余额$1000左右。结果今天收到maintenance call, 内容如
下:
Current maint call:
-$965.95
A maintenance call is issued when your account value drops below our
maintenance requirements due to changes in the market value of a security or
when you exceed your buying power. Maintenance calls may be met by
depositing funds, selling stock, or depositing securities. TD Ameritrade may
forcibly liquidate all or part of your account without prior notice,
reg... 阅读全帖
w********2
发帖数: 16371
4
buy 对应sell
没仓位卖可以叫short
这个是个covered call 所以说法上可以的。
你如在broker 单开仓位一个一个开,是一个buy to open 100 shares xxx
然后如果单独操作那么就是 sell short 那个covered call 因为没有那个call的仓位
严格说叫short 而不是sell
所以就成了所谓的 short covered call
g*******h
发帖数: 1327
5
谢!
所以对于一些dividen丰厚的股票,在计算利润的时候要考虑dividend 被call走的风险
。 比如现在95的股价,有3%的dividend,卖 call premium 收益 4 美股,最后如果股
价是97,低于99。
不考虑dividend的情况下,卖call比不卖call,多赚了2美金美股。但是dividend收益
97*0.03=2.91, 所以最后如果被call走,相当于少赚了0.91 我的数学对吧。。。
n***i
发帖数: 777
6
来自主题: Stock版 - 一个关于卖covered call的问题
如果两个同时到期的covered call 的选择, 假设 strike 和 premium 分别是 s1,
s2 , p1, p2
如果
s1+p1 = s2+p2 and s1 < s2
是不是一定选 s1 和 p1 的covered call 核算?
我是这样想的:
如果 到期时 价格 x > s2 两者一样都被call 走
如果 s1 < x < s2, 虽然 s1 的组合被call 走,但你可以选择在到期日收盘前close
position,还是赚,而且你也可以选择让它被call 走
如果 x 逻辑有问题吗?
t***h
发帖数: 2924
7
只要股市崩盘,就会有margin call. 一个地区margin call, 大资金就会卖出海外股市,
抽钱回来应对margin call. 然后海外股市也遭殃. margin call就像传染病一样感染所
有市场.美国经济再好,也抵挡不住中东, 亚洲,欧洲投资人卖美股股票回去应对他们本
地的margin call.
我感觉这轮美股来势汹汹的有序撤退, 很可能是其他地区为了应付资金短缺而卖美股.
比如中东股市崩盘.
h********o
发帖数: 3320
8
来自主题: Stock版 - 卖了4个 spy的call 怎么办
卖的时机不好,尤其是naked call,RSI不到70以上不要卖call,大盘下跌的时候,除
非是熊市,尽量不要卖call。卖put可以定期卖,但是卖call一定要看时机。


: 我是上周五卖的,原因是我有这周

: 204,204.5,205 三个到期卖的put

: 而上周五如果卖的太远 premium又太低了

: 我没有想到涨的如此猛

: call

h********o
发帖数: 3320
9
来自主题: Stock版 - 卖了4个 spy的call 怎么办
卖的时机不好,尤其是naked call,RSI不到70以上不要卖call,大盘下跌的时候,除
非是熊市,尽量不要卖call。卖put可以定期卖,但是卖call一定要看时机。


: 我是上周五卖的,原因是我有这周

: 204,204.5,205 三个到期卖的put

: 而上周五如果卖的太远 premium又太低了

: 我没有想到涨的如此猛

: call

h********o
发帖数: 3320
10
来自主题: Stock版 - 卖了4个 spy的call 怎么办
卖的时机不好,尤其是naked call,RSI不到70以上不要卖call,大盘下跌的时候,除
非是熊市,尽量不要卖call。卖put可以定期卖,但是卖call一定要看时机。


: 我是上周五卖的,原因是我有这周

: 204,204.5,205 三个到期卖的put

: 而上周五如果卖的太远 premium又太低了

: 我没有想到涨的如此猛

: call

h********o
发帖数: 3320
11
来自主题: Stock版 - 卖了4个 spy的call 怎么办
卖的时机不好,尤其是naked call,RSI不到70以上不要卖call,大盘下跌的时候,除
非是熊市,尽量不要卖call。卖put可以定期卖,但是卖call一定要看时机。


: 我是上周五卖的,原因是我有这周

: 204,204.5,205 三个到期卖的put

: 而上周五如果卖的太远 premium又太低了

: 我没有想到涨的如此猛

: call

r***l
发帖数: 9084
12
来自主题: Stock版 - 卖covered call到期该如何操作
1. 价格没到,但call最后仍然值几分钱是常有的事情,不用操作,过了周六账户里面
的covered call就消失了,股票还在。
2. 如果决定股票被call走,就不用操作,过了周六账户里面股票和covered call就都
消失了。如果决定保留股票,需要在收盘前buy calls to cover.
T*R
发帖数: 36302
13
来自主题: Stock版 - COVERED CALL几个要素
卖covered call主要是赚的时间value,你卖近期期权不能充分享受这个好处。
其次,目前是震荡市,可能是牛市的末期,所以个股面临短期大幅下跌的可能。卖
covered call的收益不能保护你股票的损失,而且可能会耽误你作出止损的决定。我最
近的一只股票本来想用covered call来保护一下,后来想想还是割了。到今天,这只股
下跌的幅度已经远远超过covered call的可能收益。就几天时间。
还是小心使得万年船。据说08年有不少大牛是死在covered call上的。
x******i
发帖数: 291
14
大牛,问下你对于卖了covered call的股票,如果遇到一直下跌,甚至跌破了止损,这
样的情况下会怎么处理?跑了留个naked call,还是继续hold等反弹?
还有就是在股票一路涨的情况下,但是未到expire date,股票没在最高位被call走,
这时候你会怎么办?假设你自己判断当时的价位是高位,你会是继续hold等call走,还
是先sell留个naked call
小白求教经验,谢谢
E***r
发帖数: 1037
15
看 call 对面的 put 多少钱。
如果临近 ex-div date 前一两天,dividend 又比 put 贵,call buyer 的理性操作是
行权;而你的理性操作是 roll the short call up and/or out in time,使得同
strike 的 put 比 dividend 便宜,从而使得对手的行权变得不理智(根据 put-call
parity,行权等于白送你一个 put 的价钱,减去 dividend)。
如果没有 dividend,就坐等不理性的 call buyer 行权,白送你 put。
p******e
发帖数: 528
16
请问如果我卖了一个cover call,那么我应该是当时就收到了这个卖call的钱,
但是如果这个call是在明年到期的话,那么我这个卖call赚到的钱是今年交税
呢?还是说要等明年这个call过期的时候,和它的underline的stock一起
计算税务的问题。谢谢。
r*****e
发帖数: 7853
17
来自主题: Stock版 - 我的Covered Call昨天被收走了
Deep in the money call, 肯定在发红之前call走
首先,call premium+strike 肯定大于 current stock price。这个在发红前后都成立
。所以,发红后差价大于红利,call才有继续拥有的意义。如果不是,就是too much
in the money,被call走不可避免
[在 BullishSolar (康南) 的大作中提到:]
:昨天是ex-div date,应该是昨天开盘前就靠走了。
:为什么会被靠走?只要看6月1号的$165的扑的价格,只有一毛多,远低于$0.73的分红
:。你理解一下,懂了你就是期权高手了。

发帖数: 1
18
为啥我的交易系统里面只有call和call vertical,没有call spread

发帖数: 1
19
来自主题: Stock版 - long position的covered call
看好一只股票,想长期hold。但是卖了covered call,strike了,要是不想改变long/
short term cost basis,有什么选择?
1. 把call买回来
2. 买对应call的stock,用新买的被call走
这两个可行吗?哪个比较cost effective?broker默认是call走最新的股票吗?
a*******e
发帖数: 3897
20
看版上几个大牛讨论说买短期(一个月)的call很不安全,很大概率亏飞。那么从反方
向思考,如果持有股票卖短期covered call,跟机构站一边,安全赚到钱的概率是不是
很大?
小蝌蚪俺去年年底这样操作过一个多月,也到手了一点蚊子肉,但最后还是因股价突然
猛涨,触发了strike被自动卖出了,算下来还不如捂住股票不操作赚得多,真可谓捡了
芝麻丢了西瓜。而且卖otm call很费神,离当前股价太远了盈利太低,太近了又怕很容
易被call走。
版上卖call发财的大神请多来传授宝贵经验,指点我们蝌蚪赚钱,谢谢谢谢!
l**h
发帖数: 893
21
【 以下文字转载自 EB23 讨论区 】
发信人: lush (lush), 信区: EB23
标 题: H.R.3012 Action Item: Call your senators now
发信站: BBS 未名空间站 (Mon Sep 17 15:23:43 2012, 美东)
This upcoming week is the last week Congress is in session for September.
Please make two phone calls to your two Senators that represent your state
and request them to pass H.R. 3012 bill. When you call, ask to speak with
someone who deals with judiciary and immigration issues and give them the
following message.
Hi, my name is ________. I live in ... 阅读全帖
d*****y
发帖数: 215
22
【 以下文字转载自 THU 讨论区 】
【 原文由 Kawin 所发表 】
1. www.dialpad.com: Good voice quality. Make free calls to US.
No need to download
2. www.i-link.com: Without a headset you can make free calls to US
by your phone. But you still have to have a computer. Go to their
sites to have details. No need to download
3. freecall.mediaring.com: Make free calls to China, US, and Cananda.
No need to download.
4. www.ip800.com: Make free calls to China, Hong Kong.
5. www.e001.com: Make free calls to Singapore, and Hong K
S******0
发帖数: 1183
23
来自主题: SanDiego版 - 想起了三毛,关于calling
我们这代人熟悉的三毛有两个,一是漫画《三毛从军记》里的主角孤儿三毛,一是已故
台湾女作家三毛。这俩三毛还真有些渊源,我记得作家三毛说她的笔名就是因喜爱漫画
三毛之极,而起。更准确点说,其中一本漫画《三毛流浪记》,仿佛就是把作家三毛呼
唤上路的,冥冥之中的,calling...
Calling这回事,有些人一辈子懵懂不知,有些人从小就不得不追随,任何力量阻挡不
了她霍然毅然的去向。
三毛原名陈懋平,从小就与众不同,无法见容于循规蹈矩的学校体制,以至于不得不辍
学在家,自闭了7年,写下处女作《惑》,尽诉敏感心灵对于人生苦忧的惶惑。她父母
(了不起的慈爱包容)非常祈望她一生凡常平安,改其名为陈平。然而她真正的生命,
还是叫三毛的那个女子,是注定要流浪注定要不平常走过一生的,三毛。
足迹跨过50多个国家,万水千山跋涉的三毛,在描绘她的来生模样时,用诗一般的语言
,写道:
如果有来生,
我要做一棵树
一半在土里安详,一半在风中飞扬
一半洒落阴凉,一半沐浴阳关
非常沉默非常骄傲
从不依靠从不寻找
树是扎根不动的。一个以流浪为存在的人,她的来生选择,却是流浪的反面 - 安居。
这,怎么解释呢?是她厌... 阅读全帖
l**h
发帖数: 893
24
【 以下文字转载自 EB23 讨论区 】
发信人: lush (lush), 信区: EB23
标 题: H.R.3012 Action Item: Call your senators now
发信站: BBS 未名空间站 (Mon Sep 17 15:23:43 2012, 美东)
This upcoming week is the last week Congress is in session for September.
Please make two phone calls to your two Senators that represent your state
and request them to pass H.R. 3012 bill. When you call, ask to speak with
someone who deals with judiciary and immigration issues and give them the
following message.
Hi, my name is ________. I live in ... 阅读全帖
j***z
发帖数: 74
25
来自主题: Seattle版 - Method to register DO NOT Call
Cell phone Number go public this month.
I just did mine and only take less than a minute to register DO NOT CALL .
It's all worth it.
Here is the information:
To prevent this, call the following number from your cell phone or your home
phone:
1-888-382-1222.
It is the National DO NOT CALL list. It will only take a minute of your
time.. It blocks your number for five (5) years. You must call from your
cell phone/or home phone.
Phone number you want to have blocked. You cannot call from a differe... 阅读全帖
q***z
发帖数: 934
26
【 以下文字转载自 Boston 讨论区 】
【 原文由 destiny 所发表 】
1. www.dialpad.com: Good voice quality. Make free calls to US.
No need to download
2. www.i-link.com: Without a headset you can make free calls to US
by your phone. But you still have to have a computer. Go to their
sites to have details. No need to download
3. freecall.mediaring.com: Make free calls to China, US, and Cananda.
No need to download.
4. www.ip800.com: Make free calls to China, Hong Kong.
5. www.e001.com: Make free calls to Singapore, and H
w*****u
发帖数: 299
27
打了这么久比赛,今天第一次因为line call和对手吵翻了。
对手是个中年老美,比赛也就是我们市的一个联赛,友谊赛啦,没奖品没奖杯。
其实比赛一开始我心里就有小不愉快。猜出他先发球,他就练习发球。他练完发球就示
意比赛开始了。我当然认为我们是在第一个发球局前练习发球 (很多业余选手喜欢这
种方式)。等到我的发球局,我说我要练习几个,他突然说,“Now you want to
practice?” 我心想你什么意思?如果是比赛前先练习发球,你怎么练完了也不问我
一声就开始打了?不过这只是个小小的愉快,不练就不练。
比赛一开始他就对我的一次call不满,我看他斤斤计较的样子,就call得比较松,比赛
还算顺利。即使如此,中间他还是不满了一次。打完头两盘已经用了两个多小 时,1-1
。第三个set一个关键球,我看见球出了一点底线,我call out,他又来抗议。我告诉
他,”I saw it was out, even though not much, but out is out.” 后来我心想,
那我不跟你吵了,call松点一样赢你。我连赢两局,4-5他发球,他一发,应该是长了
一点
K****D
发帖数: 30533
28
来自主题: Tennis版 - 关于call out
偶遇到line call严的有时就稍微放慢一点球速。一来可以控制的更好,留
裕度让他没法call out; 二来球速慢了他可能也更不容易bad call.
还不行偶就自己也喊严一点,刚出,哪怕有可能压线也call.
不过大多数情况偶都是遇到line call太松的情况。比如偶2发都明显出了1个
球距离,对方居然继续打,偶也不好说啥。
m*****i
发帖数: 1873
29
来自主题: TexasHoldem版 - is this a good fold or call?
NL 500$ blind 5$/5$
bet 20$ in late positon, button called, small blind called , big blind
called.
flop is QK 3 no flush draw.
everyone checked to me, I bet 40$, only big blind called.
turn is A, he checked to me, I bet 55$( after a painful thought because I
think he may have 10 J)
as I expected, he check raise all in 205$ more!
He didn't have any information to me yet. should I call this 205$???!
Tough one.
W********m
发帖数: 7793
30
来自主题: TexasHoldem版 - call or not to call river bets
Here is two hand whether to call or not to call river bets
hand one i have refered to in another thread.
NL 25 "i had KK EP and raise 3X, MP reraised me 3 times. i just flat called.
flop all small cards, i check raised him. he called. now I am confused he
has QQ or AA? so turn i have to check out of position. and he checked
behind.. river Q.. now i am screwed. AA QQ both beat me.. he bets half pot."
I took a werid line here as I discussed. I should have 4 bets preflop and
shove flop. But as
W********m
发帖数: 7793
31
来自主题: TexasHoldem版 - call turn raise all in?
NL 10 here.
Button go pocket 8s.
LP limp. I raise to 40c. everyone fold LP call
flop 7dkd5c.
LP check, i bet 60c
turn Kh,
LP check I bet 1$, LP raise me to 5.15$ i have 5.92$ left. Is this a call?
check call preflop and flop and check raise turn all in.
I think he either flopped a small set or he has flush draw.. The big raise
all in really smell suspicious. I folded in the end. but would you call? I
have been raised so much on turn recently.. big all in raise.. it is very
hard for me to call
W********m
发帖数: 7793
32
来自主题: TexasHoldem版 - Calling station calls river?
EP limp. I am at MP dealt QdQs
raise to 3.5X sb calls EP calls. pot 11X
flop 5d4hjs
sb lead 6X EP fold I call pot 22X
turn 3h
sb bets 17X I call pot 54X
river 7h SB all in 31X
What do i do here?
W********m
发帖数: 7793
33
来自主题: TexasHoldem版 - call shove or fold?
I have been thinking about hands like this a lot. I would love to have some
more discussion here. I don't quite see how I can call the shove. Because
through all of his range of hand listed here. I am either drawing dead, big
underdog or slight advantage. Hard to imagin that I can get +EV out of this.
If it is a raised reraised pot preflop, then it is a much easier call
shove from me.
If I won't call a shove, then i feel I should just call flop. Not planning
to call down to river but to give
W********m
发帖数: 7793
34
来自主题: TexasHoldem版 - What's up with the cold call 3 bet?
I thought one of them was going to call me at least with all the dead money out there.
=================
Full Tilt Poker $0.50/$1 No Limit Hold'em - 9 players -
SB: $104.80
BB: $319.90
UTG: $140.90
UTG+1: $103.10
UTG+2: $108.75
Hero (MP1): $113.15
MP2: $135.65
CO: $95.00
BTN: $100.00
Pre Flop: ($1.50) Hero is MP1 with As Ac
2 folds, UTG+2 raises to $3, Hero calls $3, MP2 raises to $10, CO calls $10,
2 folds, BB calls $9, UTG+2 calls $7, Hero raises to $113.15 all in, 3
folds, UTG+2 requests TIME... 阅读全帖
T*********k
发帖数: 1621
35
来自主题: TexasHoldem版 - Would you call or fold this hand at the river?
I am not neccesory agree with the big bet on the flop.
A pot size bet, in this case, $80, will make the pot way to big to manage on
later street, especailly when I am OOP. I doubt it will stop some loose
player to chase gutter as well, especially there is another player called as
well, giving better odds to chase a gutter in late position.
Plus it doesn't gain much information as well. QK, QJ will have also called,
sometimes you even get called by QT. After all, ppl play those broadway
card and ... 阅读全帖
b*****t
发帖数: 52
36
来自主题: TexasHoldem版 - Will you make that call?
assume he is not on tilt. THEN
this 500 bet is so weird. Why so big? So we need to look into the redneck's
mind to see what could be the possible answer.
preflop you raise he call. You have a good hand, could be AQ,AK,AJ,A10,KQ,KJ
,QJ,910s,89s,87s, AA, KK, QQ, JJ,10s,9s,8s,7s blabla.
he could have similar hand possible a little bit stronger since he called
your raise.
flop Q 8 7, no flush, he is not worried about flush. he checked first. if he
had a pair of Q I'd say check raise or bet is good. ... 阅读全帖
q****8
发帖数: 3281
37
81160967-227 - Bellagio VI
Holdem No Limit ($3/$6) Holdem
Friday 30 Jan 2015 3:53:47 AM
1: tdce36
2: bigrpkct2
3: PanamonCreel22
4: iP3ncil (Dealer)
5: T1ltinstg8r
6: HERO
*** BLINDS ***
T1ltinstg8r Posts Small Blind $3.00
HERO Posts Big Blind $6.00
*** PREFLOP ***
HERO Hole Cards: 6s,7h
tdce36 Raises $16.00
bigrpkct2 Folds
PanamonCreel22 Calls $16.00
iP3ncil Folds
T1ltinstg8r Folds
HERO Raises $66.00
tdce36 Folds
PanamonCreel22 Calls $50.00
*** POSTFLOP ***
Community Cards: 6d,2d,5s
HERO Bet $1... 阅读全帖
w**********2
发帖数: 2262
38
来自主题: Midlife版 - PUT 和CALL的应用
应该不是这样。
买PUT买CALL, 是买的预期。如果你预期在未来的某个时段内,比如BAC, 在10/20日
,股价的市场价在26.5, 如果股价高于26.5, PUT就毫无价值,没人会买。但是CALL
就有价值,会有人买。 市场价越低,PUT越值钱,CALL越不值钱。
PUT和CALL的杠杆作用是一样的。
那么关键还是你预期的在某个时间点的股价会是多少。比如你预期10/20的BAC的股价是
26.5, 你最好不要买高于26.5 的BAC的CALl, 不要买低于26.5 的PUT。
h*******r
发帖数: 909
39
来自主题: Belief版 - [转载] 这算不算be called或信仰
【 以下文字转载自 Wisdom 讨论区 】
【 原文由 hotsummer 所发表 】
上面各位在谈论宗教信仰, 好象排除了用逻辑来证明后再信仰的可能性, 这也是我和很多
信教的人交流的结果, 如果用逻辑来讨论他们为什么信教的问题的话是永远没有结果的
因为他们在逻辑上无法自园其说, 比如如何证明上帝的存在, 曰圣经,为什么圣经是解释
这个问题的权威, 曰因为圣经是上帝的书,循环就此开始, 最终的结论绝对是逻辑无法
解释宗教问题, 当初信教就是be called.
我无意冒犯各位教徒,无论基督教也好佛教也好, 我的问题是, be called不是只局限于这
些名门大教的现象, 而是一个广泛存在的现象, 很多人觉得自己be called, 有的因此
成为神汉巫婆, 有的成为这样那样宗教的狂热信徒,也有的成为罪犯, 比如变态杀人狂,
他们也说是有个声音在叫他们如此这般干, 还有的成为纳粹党徒和共产党员, 他们也有很
坚定的信仰, 有和be called一样的使命感. 当然, 这么说不是指所有的神汉巫婆
变态杀人犯纳粹党员和共产党员都是be called, 而是说在他们中间也的确有感到自己b
r***i
发帖数: 24
40
平安夜,我的call机丢了
从红墙到小天府
一段不会超过30的距离
仅仅是为了查询一个留言
平安夜,我的call机丢了
我的call台是天纬,请打95922
call2132318
摩托罗拉牌吗?
我无法说出它更具体的特征
平安夜,我的call机丢了
我穿梭于地铁和的士之间
是为了听几场报告
顺便添添自己的肚子
更深层的原因,也许是
和朋友聚聚,仅仅是因为
我无处可去
我可以怪塞车
但迟到不会原谅我的酒量
所以我必须喝点啤酒
两杯就够了
这点,朋友们都知道
平安夜,我的call机丢了
其实丢了就丢了
没什么大不了的,我想这样对自己说
其实你运气
l*********t
发帖数: 577
41
【 以下文字转载自 PDA 讨论区 】
发信人: lovepursuit (The Pursuit of Love), 信区: PDA
标 题: Tmobile的WIFI-Calling需要买Tmobile版的iPhone 7吗?
发信站: BBS 未名空间站 (Mon Sep 12 14:59:40 2016, 美东)
准备入手iPhone 7,希望能支持Tmobile的WIFI-Calling,这样回中国还能在有WIFI的
地方免费跟美国打电话。
问题来了,我需要买Tmobile版的iPhone 7吗?我之前用的android机,必须是Tmobile
版的才有WIFI-calling.
但是我搜索了一下,好像iPhone 7都支持WIFI Calling. 是不是我买个Verizon版的
iphone 7, 插入T-mobile的卡,就能使用wifi-calling? 如果可以的话,又有一个新的
问题,Apple store买的Verizon版iPhone7是不是unlocked, 插入Tmobile的卡能不能用?
he
发帖数: 2025
42
来自主题: EmergingNetworking版 - 如何用一个号码同时接多个call?
算了,还是全英文吧,太不好翻译了。
Traditional:
PSTN - PRI ports on voice gateways - CallManager,PBX,Asterisk...Each PRI
provides 23 call channels;
PSTN - POTS lines(roll over 1 by 1) - FXO card - Asterisk,Linksys...
pure VoIP:
PSTN - VoIP provider - Internet - Asterisk, CallManager....etc. Usually
these VoIP Providers sell multi-call capacity dirty cheap. But the call
quality is out of control (calls going through Internet)
PSTN - SIP providers - either CUBE or CCM. SIP sucks until we have a true
standard (too ... 阅读全帖
j********r
发帖数: 21
43
Call-back is widely used for asynchornized interaction. It's implemented by
passing a function pointer to a call. when the called operation is exceuted,
at some point, the call-back function is called to do something for the
caller.
function pointer is like a variable for functions, and a variable for values.
i**p
发帖数: 902
44
来自主题: Programming版 - Android C/C++ native calls Java APIs (转载)
【 以下文字转载自 Java 讨论区 】
发信人: isup (No), 信区: Java
标 题: Android C/C++ native calls Java APIs
发信站: BBS 未名空间站 (Fri Jul 20 01:22:38 2012, 美东)
There are lots of examples that Android C/C++ native calls Java APIs.
However, all of these examples I have read are the Java APIs call native
first and then the native calls other Java APIs by using the passed JNI-ENV.
How could C/C++ native calls Java APIs without the passed JNI-ENV, or by
anyway to get the JNI-ENV?
Can you give an example or a link for it?
Th... 阅读全帖
z*******w
发帖数: 79
45
来自主题: Security版 - Simple system call checking LKM
This LKM is designed to catch the "evil" LKM's that modifies the system
calls. The idea is to write down the original system call address. After
some evil LKM installed, some system call address would be changed. So by
comparing the original address and current address, we can catch such
attacks.
It would detect those that modify kernel memory, system call functions'
memory, for example; and those attacks that don't modify system calls.
Here is the code:
/*
* Compile:
* gcc -O2 -c get_sys_c
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