[ECOS] Re: Re: mount()/umount() prototypes

[Savin Zlobec <savin at torina dot fe dot uni-lj dot si>]

Nick Garnett <nickg@ecoscentric.com> writes:

> Savin Zlobec <savin@elatec.si> writes:
>
> > Thomas Koeller wrote:
> >
> > >Savin Zlobec wrote:
> > >
> > >>>Hi,
> > >>>
> > >>>there appears to be no header file that implements prototypes for mount()
> > >>>and umount(). When I build for the linux synthetic target and have
> > >>>'#include <sys/mount.h>' in my program, everything works because
> > >>>'-nostdinc' is not among the compiler switches by default. However, if I
> > >>>compile for my real target then there is no such header, and after I
> > >>>remove the '#include', I get warnings about implicit declarations.
> > >>>
> > >>Look in 'io/fileio/current/include/fileio.h'
> > >>
> > >>savin
> > >>
> > >
> > >I see. Because there are 'standard' functions, I expected them to be in some
> > >standard header. Btw., there are source files that include sys/mount.h, as
> > >demonstrated below:
> > >
> > >bash-2.05b$ find /pub/ecos/cvs/packages/ -type f -name "*.c" -exec grep -l '#include <sys/mount.h>' '{}' \;
> > >
> > >/pub/ecos/cvs/packages/net/tcpip/current/src/sys/kern/sys_generic.c
> > >/pub/ecos/cvs/packages/net/tcpip/current/src/sys/kern/uipc_syscalls.
> > >
> > Look closer - it is included if __ECOS is NOT defined.
> >
> > #ifndef __ECOS              #include <sys/mount.h>
> > #endif // __ECOS
> >
> > But I agree with you some standard headers would be nice.
>
> Except that they are not actually standard functions. mount() and
> umount() tend to differ between different breeds of UNIX, Linux is
> different from BSD for example. They are also not part of any standard
> such as POSIX.
>
> The problem is that how you get a filesystem mounted is a very
> OS-specific thing. In eCos these functions support only the eCos way
> of doing it. Hence having the prototypes in an eCos-specific header is
> a good way of reminding the user that he is being non-portable when
> using them.

That makes sense.

Since we are on the topic - I really miss flags field in (u)mount.
Especially to umount, when I need to do a forced umount (in case
the CF gets disconnected and then connected back again).
Both BSD and Linux have this (well in Linux you have umount2).

savin




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