hello.c Source:
#include "/home/mzhu/linux/include/linux/config.h"
/*retrieve the CONFIG_* macros */
#if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS)
#define MODVERSIONS /* force it on */
#endif
#ifdef MODVERSIONS
#include "/home/mzhu/linux/include/linux/modversions.h"
#endif
#include "/home/mzhu/linux/include/linux/module.h"
int init_module(void) { printk("<1>Hello, world\n"); return 0; }
void cleanup_module(void) { printk("<1>Goodbye cruel world\n"); }
Output:
#>gcc -D_KERNEL_ -DMODULE -c hello.c
[This builds the hello.o file. ]
#>insmod hello.o
hello.o : unresolved symbol printk
hello.o : Note: modules without a GPL compatible license cannot use
GPONLY_symbols
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