Date: Tue, 22 Nov 2005 20:32:10 -0800 From: Daniel Rudy <dr2867@pacbell.net> To: freebsd-hackers@freebsd.org Subject: getdirentries_args and other kernel syscall structures Message-ID: <4383F0CA.2030609@pacbell.net>
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Ok, I'va got a little question here. In the structure
getdirentries_args, there seems to be duplicated fields that I'm not
entirely sure what they do. Here's the definition of a structure
verbatim from sys/sysproto.h:
struct getdirentries_args {
char fd_l_[PADL_(int)]; int fd; char fd_r_[PADR_(int)];
char buf_l_[PADL_(char *)]; char * buf; char buf_r_[PADR_(char *)];
char count_l_[PADL_(u_int)]; u_int count; char
count_r_[PADR_(u_int)];
char basep_l_[PADL_(long *)]; long * basep; char
basep_r_[PADR_(long *)];
};
Now my question is what does the l and r variables do? It seems that
they do something with padding the data based on the endian of the
machine? I look through this header file, and I see all the structures
have similar constructs. Is it something that can be safely ignored?
--
Daniel Rudy
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