Hi guys,
I suddenly think about this question. While we use fopen() to open a
file and then do reading and writing. Is fopen a blocked function?
Regards!
Bo
6  2415 
Bo Yang wrote:
Hi guys,
I suddenly think about this question. While we use fopen() to open a
file and then do reading and writing. Is fopen a blocked function?
What is a blocked function?
--
Ian Collins.
Ian Collins :
Bo Yang wrote:
>Hi guys,
I suddenly think about this question. While we use fopen() to open a
file and then do reading and writing. Is fopen a blocked function?
What is a blocked function?
I mean if there is soem other process is now using the file, how the
fopen will act? It fails directly or just waiting there to the process
which uses the file release the file?
Regards!
Bo
Bo Yang wrote:
Ian Collins :
>Bo Yang wrote:
>>Hi guys,
I suddenly think about this question. While we use fopen() to open a
file and then do reading and writing. Is fopen a blocked function?
What is a blocked function?
I mean if there is soem other process is now using the file, how the
fopen will act? It fails directly or just waiting there to the process
which uses the file release the file?
The standard doesn't say, why should there be a problem with more than
one process opening a file?
There may be platform dependent error returns if a file is exclusive.
--
Ian Collins.
Ian Collins :
Bo Yang wrote:
>Ian Collins :
>>Bo Yang wrote:
Hi guys,
I suddenly think about this question. While we use fopen() to open a
file and then do reading and writing. Is fopen a blocked function?
What is a blocked function?
I mean if there is soem other process is now using the file, how the
fopen will act? It fails directly or just waiting there to the process
which uses the file release the file?
The standard doesn't say, why should there be a problem with more than
one process opening a file?
There may be platform dependent error returns if a file is exclusive.
So, if there are many process want to do fopen("file","a"); . Are they
all success? Or there are some will failed?
Bo Yang wrote:
Ian Collins :
>Bo Yang wrote:
>>Ian Collins :
Bo Yang wrote:
Hi guys,
I suddenly think about this question. While we use fopen() to open a
file and then do reading and writing. Is fopen a blocked function?
>
What is a blocked function?
I mean if there is soem other process is now using the file, how the
fopen will act? It fails directly or just waiting there to the process
which uses the file release the file?
The standard doesn't say, why should there be a problem with more than
one process opening a file?
There may be platform dependent error returns if a file is exclusive.
So, if there are many process want to do fopen("file","a"); . Are they
all success? Or there are some will failed?
That depends on the platform and system specific things like file locks.
--
Ian Collins.
Bo Yang wrote:
I mean if there is soem other process is now using the file, how the
fopen will act? It fails directly or just waiting there to the
process which uses the file release the file?
As stated by the others, the Standard doesn't specify. Generally, they
will all be able to open. That's why most platforms provide some sort
of file-locking ability.
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