Date: Sat, 26 Feb 2005 01:10:46 -0800 (PST) From: Yan Yu <yanyu@CS.UCLA.EDU> To: freebsd-hackers@freebsd.org Subject: confusion on fopen()/falloc() Message-ID: <Pine.GSO.4.58.0502260103420.13229@panther.cs.ucla.edu> In-Reply-To: <Pine.GSO.4.58.0502260043200.12442@panther.cs.ucla.edu> References: <20050226072645.76950.qmail@web26802.mail.ukl.yahoo.com> <Pine.GSO.4.58.0502260043200.12442@panther.cs.ucla.edu>
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Hello, all,
I have a user program as below:
FILE *fd;
while (1)
{
fd= fopen( "tmp", "r" );
if ( fd == NULL )
break;
}
from my understanding, since i open the same file to read, my process
should create a new file descriptor each time when fopen is called.
Therefore, inside the kernel, fdalloc() should be called, NOT falloc()
(since falloc() allocates a new FILE * struct in addition to a new file
descriptor),
BUT based on what i observed (i instrumented falloc() function), it seems
that falloc() is called each time when fopen() is called.
I am wondering where i missed?
Any hints is appreciated!
Best,
yan
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