Thanks for ur reply.
got it. looking in wrong path. from where i can get docs on sysdeps dir
structure and some detail on its functions
One more problem. i m looking for File System functions like __unlink ,
__open etc.
they r defined in 2 places in the tree under sysdeps/mach/hurd/unlink.c
or in /sysdeps/generic/unlink.c
generic/unlink.c is same as generic/system.c.
sysdeps/mach/hurd/unlink.c looks like the main unlink code. but its using
some functions which i m unable to find.
like __dir_unlink.
Andreas Jaeger wrote:
> >>>>> Junaid Iqbal writes:
>
> > hi all.
> > I m unable to undersatnd how system calls implemented in glibc (ver
> > 2.1.3).
> > for example __libc_system function (defined in system.c) have these
> > lines
> That's the fall back in sysdeps/generic/system.c, the function used on
> Linux is in sysdeps/posix/system.c. Read the documentation about the
> sysdeps directory and have also a look at syscalls.list.
>
> > #include <errno.h>
> > #include <stdlib.h>
>
> > /* Execute LINE as a shell command. */
> > int
> > __libc_system (line)
> > const char *line;
> > {
> > if (line == NULL)
> > return 0; /* This indicates no command processor. */
>
> > __sys_errno (ENOSYS);
> > return -1;
> > }
> > weak_alias (__libc_system, system)
>
> > stub_warning (system)
> > #include <stub-tag.h>
>
> > can some one give me hand in understanding this?
> > thanks in advance.
>
> --
> Andreas Jaeger
> SuSE Labs [EMAIL PROTECTED]
> private [EMAIL PROTECTED]
