Messages in this thread | | | Date | Fri, 3 Sep 2010 11:01:58 -0700 | From | Randy Dunlap <> | Subject | Re: LDD examples |
| |
On Fri, 27 Aug 2010 18:32:03 -0400 Someone Something wrote:
> I downloaded the LDD examples > (http://examples.oreilly.com/9780596005900/), and I unzipped the file > and just tried building it with make just to see if it built properly > and here are the errors I get: > setlevel.c:30: error: expected declaration specifiers or '...' before 'type' > setlevel.c:30: error: expected declaration specifiers or '...' before 'bufp' > setlevel.c:30: error: expected declaration specifiers or '...' before 'len' > setlevel.c:30: warning: data definition has no type or storage class > setlevel.c:30: warning: type defaults to 'int' in declaration of '_syscall3' > setlevel.c: In function 'main': > setlevel.c:41: warning: implicit declaration of function 'syslog' > > have any of use experienced these errors? Is this book out of date? > Alternatives? > --
The examples are certainly out of date.
'man 2 _syscall' says that it is obsolete and deprecated.
Fixing the userspace programs is easy. E.g., for setlevel.c, just #include <unistd.h> and change this line:
-_syscall3(int, syslog, int, type, char *, bufp, int, len); +#define syslog(type, bufp, len) syscall(8, type, bufp, len)
For the kernel modules, remove #include <linux/config.h> from all of them and change CFLAGS to EXTRA_CFLAGS in all Makefiles.
The biggest remaining problem with the kernel modules is scheduled_work usage and its changing API.
--- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code ***
| |