如何判断文件是否打开 [英] how to tell if a file is open
问题描述
Heya all，
如何通过编程方式判断是否已打开文件进行读/写$ / b $ b其他一些过程？在unix ..当然。
我的程序需要打开文件并对其进行处理，我希望它能使
确保文件不是被写入（例如通过scp，cp，mv等）
，然后我才开始打开它。是否有任何功能可以查看
文件的状态？使用/实现锁定机制是不可能的。
如果语言没有提供，那么Unix
操作系统是否提供了什么？
Shilpa
sh ************ @ gmail.com 写道：
我如何告诉我，如果一个文件被读取/写入由/ b
其他一些进程？在unix ..当然。
在comp.unix.programmer中更好地询问Unix问题。
-
课程对我们所有人来说：即使在琐事中也有陷阱。
--Eric Sosman
sh ************ @ gmail.com 写道：
如何以文件方式判断文件是否被打开以进行读/写
其他一些过程？在unix ..当然。
正如Ben所说，这在comp.unix.programmer上得到了最好的解答。但是，在C中你可以使用Shel Silverstein方法获得
，类似于他的
算法来确定窗口是否打开：
#include< stdio.h>
int main（无效）
{
FILE * fp;
if（（fp = fopen（" foo.txt"））！= NULL）{
/ *它没有打开！让我们试试另一个吧！ * /
fclose（fp）;
if（（fp = fopen（" bar.txt"））！= NULL）{
/ *哇哦！ * /
fclose（fp）;
}
else {
/ * CRASH！猜猜一个是......让我们试试另一个！ * /
/ * ... * /
}
}
返回0;
}
-
C. Benson Manica |我*应该*知道我在说什么 - 如果我
cbmanica（at）gmail.com |不，我需要知道。火焰欢迎。
我认为这个问题有资格放在这里。
Ben Pfaff写道：
< blockquote class =post_quotes> sh************@gmail.com 写道：
如何通过编程方式判断是否打开了一个文件进行读/写
其他一些过程？在unix ..当然。
在comp.unix.programmer中更好地询问Unix问题。
-
课程对我们所有人来说：即使在琐事中也有陷阱。
--Eric Sosman
Heya all,
How do I tell, prgrammatically, if a file is opened for read/write by
some other process? In unix .. of course.
My program needs to open files and work on it, and I want it to make
sure that the file is not being written to (e.g. by scp, cp, mv etc)
before I attampt to open it. Is there any function to see the status of
the file ? Using/implementing locking mechanism is out of the question.
If not provided by the language, is there anything provided by the Unix
operatins system ?
Shilpa
sh************@gmail.com writes:
How do I tell, prgrammatically, if a file is opened for read/write by
some other process? In unix .. of course.Unix questions are better asked in comp.unix.programmer.
--
"A lesson for us all: Even in trivia there are traps."
--Eric Sosman
sh************@gmail.com wrote:
How do I tell, prgrammatically, if a file is opened for read/write by
some other process? In unix .. of course.As Ben noted, this is best answered on comp.unix.programmer. However,
in C you can use the Shel Silverstein approach, similar to his
algorithm for determining whether a window is open:
#include <stdio.h>
int main(void)
{
FILE *fp;
if( (fp=fopen("foo.txt")) != NULL ) {
/* It wasn''t open! Let''s try another one! */
fclose( fp );
if( (fp=fopen("bar.txt")) != NULL ) {
/* Woohoo! */
fclose( fp );
}
else {
/* CRASH! Guess that one was... Let''s try another one! */
/* ... */
}
}
return 0;
}
--
C. Benson Manica | I *should* know what I''m talking about - if I
cbmanica(at)gmail.com | don''t, I need to know. Flames welcome.
I think this question qualifies to be put in here.
Ben Pfaff wrote:sh************@gmail.com writes:
How do I tell, prgrammatically, if a file is opened for read/write by
some other process? In unix .. of course.
Unix questions are better asked in comp.unix.programmer.
--
"A lesson for us all: Even in trivia there are traps."
--Eric Sosman
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