/* * Copywrite 2002 Der Herr Hofrat * License GPL V2 * Author der.herr@hofr.at *//* * prototype usage of loadable system call - this will grab the dynamically * allocated system cal number from /proc/pal_sys_nr and then trigger the * system call via syscall(#) - run demesg to check output from the actual * system call. */ #include <stdio.h>      /* printf */#include <asm/unistd.h> /* __NR_test_call _syscall0() */#include <errno.h>      /* for syscall() _syscall0() */int main(int argc,char ** argv){	int syscall_nr;	FILE *pal_sys_nr;	/* grab the syscall number to use */	if((pal_sys_nr = fopen("/proc/pal_sys_nr","r")) == NULL )	{		perror("Cannot open /proc/pal_sys_nr - did you load the modules ?");		exit(-1);	}	fscanf( pal_sys_nr, "PAL syscall Nr:%d\n", &syscall_nr );	fclose(pal_sys_nr);	/* invoce the system call now */		syscall(syscall_nr);	printf("now type  dmesg  to see the printk from default pal syscall\n");	return 0;}