/* * export.c -- export a symbol (maybe a versioned one) * * Tested with 2.0 on the x86, Sparc */ #ifndef __KERNEL__ # define __KERNEL__ #endif #ifndef MODULE # define MODULE #endif /* This stuff might go in the Makefile, but I'd better put it here */ #ifndef EXPORT_SYMTAB # define EXPORT_SYMTAB /* need this one 'cause we export symbols */ #endif #include /* retrieve the CONFIG_* macros */ #if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS) # define MODVERSIONS #endif /* * Include the versioned definitions for both kernel symbols and our * symbol, *unless* we are generating checksums (__GENKSYMS__ * defined) */ #if defined(MODVERSIONS) && !defined(__GENKSYMS__) # include # include "export.ver" /* redefine "export_function" to include CRC */ #endif /* * Everything from now on is normal. The previous stuff can be replaced * by "$(CC) -D__KERNEL__ -DMODULE -DMODVERSIONS -DEXPORT_SYMTAB \ * -include $(INCLUDEDIR)/linux/modversions.h" if versioning * is enabled, and the following (simpler) cmdline for genksyms: * "$(CC) -E -DCONFIG_MODVERSIONS -DEXPORT_SYMTAB" */ #include #ifndef LINUX_VERSION_CODE /* I don't want compile errors with 1.2 */ # include #endif #include "sysdep.h" #if LINUX_VERSION_CODE < VERSION_CODE(1,3,57) # error "This module needs Linux 1.3.57 or newer" #else #include #include /* printk() */ #include /* our dumb function, with two dumb arguments */ int export_function(int a, int b); int init_module(void) { static struct symbol_table export_syms = { #include X(export_function), #include }; register_symtab(&export_syms); return 0; } void cleanup_module(void) { } int export_function(int a, int b) {return a+b;} #endif /* 1.3.57 or newer */
