/* vi: set sw=4 ts=4: */ /* * fgetversion.c - Get a file version on an ext2 file system * fsetversion.c - Set a file version on an ext2 file system * * * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr> * Laboratoire MASI, Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * This file can be redistributed under the terms of the GNU Library General * Public License */ /* * History: * 93/10/30 - Creation */ #ifdef HAVE_ERRNO_H #include <errno.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <fcntl.h> #include <sys/ioctl.h> #include "e2p.h" #ifdef O_LARGEFILE #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK|O_LARGEFILE) #else #define OPEN_FLAGS (O_RDONLY|O_NONBLOCK) #endif /* To do fsetversion: unsigned long *ptr_version must be set to NULL. and unsigned long version must be set to a value To do fgetversion: unsigned long *ptr_version must NOT be set to NULL and unsigned long version is ignored. TITO. */ int fgetsetversion (const char * name, unsigned long * get_version, unsigned long set_version) { #ifdef HAVE_EXT2_IOCTLS int fd, r, ver, save_errno = 0; fd = open (name, OPEN_FLAGS); if (fd == -1) return -1; if (!get_version) { ver = (int) set_version; r = ioctl (fd, EXT2_IOC_SETVERSION, &ver); } else { r = ioctl (fd, EXT2_IOC_GETVERSION, &ver); *get_version = ver; } if (r == -1) save_errno = errno; close (fd); if (save_errno) errno = save_errno; return r; #else /* ! HAVE_EXT2_IOCTLS */ errno = EOPNOTSUPP; return -1; #endif /* ! HAVE_EXT2_IOCTLS */ }