hi, so u have not used the option -I/usr/src/linux/include while compiling module or wherever yr source of linux kernel is placed,and many more errors are even not because of this also? Prasanna > Hi > > I am a Newbie in Kernel Programming and just now > subscribed to this list. Writing my first kernel > module and reading Alessandro?s book on Linux Device > Driver. > > When I compile my simple module with gcc, it > throughs al bunch of errors. > > As far as I think the errors are because the gcc > could not find the defination of few of the > structure used, like struct file, struct inode and > struct file_operations etc. I have included the > linux/fs.h file and have also define the required > macros like MODULE and __KERNEL__, but still not > able to compile it successfully. > > For debugging, I ran the macro option (-E) of gcc to > get the output of Macro, so that I could know what > exactly is included in file before compilation. In > the Macro output I could not find the definations of > above mentioned structure, although they are defined > in linux/fs.h and I have included that file in my > source. > > I am pasting the output of gcc below. > > Also pasting the source of my module. > > Please have a look at it and help me if you can. > > In source I have left few of the functions like > open, release etc, blank. I have just started > writing it and will complete it once I get through > this problem. > > Details of my system: > > Single Processor > > Redhat Enterprise 3.1 > > Kernel: linux-2.4.21-4 > > Compiler : gcc 3.2.3.20 > > I have one more this to say, when I cteared the > simple "Hello World" module and compiled it, it > compiled without any problem, but when I tried to > load that module in kernel, insmod command gave me > versioning error. It said that you are trying to > load the module against different kernel version. > Well I know it can happen, but my question on this > is, is it possible that the runnning kernel might be > different from the kernel in source tree. I did not > downloaded the source, It?s the default source which > comes with installation. > > Anyway, please take a look at the errors and source > to help me out. > > > > ************************************************************************************************ > > Output of gcc > > ************************************************************************************************ > > main.c:27: warning: `struct file' declared inside > parameter list > > main.c:27: warning: its scope is only this > definition or declaration, which is probably not > what you want > > main.c:27: warning: `struct inode' declared inside > parameter list > > main.c:28: warning: `struct file' declared inside > parameter list > > main.c:29: warning: `struct file' declared inside > parameter list > > main.c:30: warning: `struct file' declared inside > parameter list > > main.c:31: warning: `struct file' declared inside > parameter list > > main.c:31: warning: `struct inode' declared inside > parameter list > > main.c: In function `fifo_init_module': > > main.c:71: invalid use of undefined type `struct > file_operations' > > main.c:72: invalid use of undefined type `struct > file_operations' > > main.c:73: invalid use of undefined type `struct > file_operations' > > main.c:73: `write' undeclared (first use in this > function) > > main.c:73: (Each undeclared identifier is reported > only once > > main.c:73: for each function it appears in.) > > main.c:74: invalid use of undefined type `struct > file_operations' > > main.c:75: invalid use of undefined type `struct > file_operations' > > main.c:77: warning: implicit declaration of function > `register_chrdev' > > main.c:80: warning: implicit declaration of function > `printk' > > main.c:80: `KERN_EMERG' undeclared (first use in > this function) > > main.c:80: syntax error before string constant > > main.c: In function `fifo_cleanup_module': > > main.c:101: warning: implicit declaration of > function `unregister_chrdev' > > main.c:101: `fifo_f_ops' has an incomplete type > > main.c: At top level: > > main.c:122: warning: `struct file' declared inside > parameter list > > main.c:122: warning: `struct inode' declared inside > parameter list > > main.c:122: conflicting types for `fifo_open' > > main.c:27: previous declaration of `fifo_open' > > main.c:140: warning: `struct file' declared inside > parameter list > > main.c:140: conflicting types for `fifo_read' > > main.c:28: previous declaration of `fifo_read' > > main.c:160: warning: `struct file' declared inside > parameter list > > main.c:160: conflicting types for `fifo_write' > > main.c:29: previous declaration of `fifo_write' > > main.c:175: warning: `struct file' declared inside > parameter list > > main.c:175: conflicting types for `fifo_llseek' > > main.c:30: previous declaration of `fifo_llseek' > > main.c:194: warning: `struct file' declared inside > parameter list > > main.c:194: warning: `struct inode' declared inside > parameter list > > main.c:194: conflicting types for `fifo_release' > > main.c:31: previous declaration of `fifo_release' > > main.c:203: warning: type defaults to `int' in > declaration of `module_init' > > main.c:203: warning: parameter names (without types) > in function declaration > > main.c:203: warning: data definition has no type or > storage class > > main.c:204: warning: type defaults to `int' in > declaration of `module_exit' > > main.c:204: warning: parameter names (without types) > in function declaration > > main.c:204: warning: data definition has no type or > storage class > > main.c:44: storage size of `fifo_f_ops' isn't known > === message truncated === __________________________________ Do you Yahoo!? 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