Example 2. Program for C I/O Device

#include <file.h> #include <stdio.h> /****************************************************************************/ /* Declarations of the user-defined device drivers */ /****************************************************************************/ extern int MYDEVICE_open(const char *path, unsigned flags, int fno); extern int MYDEVICE_close(int fno); extern int MYDEVICE_read(int fno, char *buffer, unsigned count); extern int MYDEVICE_write(int fno, const char *buffer, unsigned count); extern off_t MYDEVICE_lseek(int fno, off_t offset, int origin); extern int MYDEVICE_unlink(const char *path); extern int MYDEVICE_rename(const char *old_name, char *new_name); main() { FILE *fid; add_device("mydevice", _MSA, MYDEVICE_open, MYDEVICE_close, MYDEVICE_read, MYDEVICE_write, MYDEVICE_lseek, MYDEVICE_unlink, MYDEVICE_rename); fid = fopen("mydevice:test","w"); fprintf(fid,"Hello, world\n"); fclose(fid); }