char driver

Altera_Forum · ‎05-25-2005

Is it not possible to have two successive writes/reads for a device opened in "r+" mode without closing and reopening the device? I have written char driver for this device which has a number of registers to be read and written. Are successive writes possible in some other fopen mode ("w+" etc?). Or this should be taken care of in the driver? Or is it a virtue of char mode drivers?

Thanks!

Pankaj

Altera_Forum · ‎05-25-2005

$ man fopen:

The fopen function opens the file whose name is the string pointed to by path and associates a stream with it.

For device files, you need to use:

int handle = open(/dev/mtd/5, O_RDWR);
/* ... */
close(handle);