grub/grub-core/osdep/unix/hostdisk.c

215 lines
5 KiB
C
Raw Normal View History

/* hostdisk.c - emulate biosdisk */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004,2006,2007,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config-util.h>
#include <grub/disk.h>
#include <grub/partition.h>
#include <grub/msdos_partition.h>
#include <grub/types.h>
#include <grub/err.h>
#include <grub/emu/misc.h>
#include <grub/emu/hostdisk.h>
#include <grub/emu/getroot.h>
#include <grub/misc.h>
#include <grub/i18n.h>
#include <grub/list.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#if !defined (__CYGWIN__) && !defined (__MINGW32__) && !defined (__AROS__)
#ifdef __linux__
# include <sys/ioctl.h> /* ioctl */
# include <sys/mount.h>
# if !defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1)))
/* Maybe libc doesn't have large file support. */
# include <linux/unistd.h> /* _llseek */
# endif /* (GLIBC < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR < 1)) */
#endif /* __linux__ */
grub_uint64_t
grub_util_get_fd_size (grub_util_fd_t fd, const char *name, unsigned *log_secsize)
{
struct stat st;
grub_int64_t ret = -1;
if (fstat (fd, &st) < 0)
/* TRANSLATORS: "stat" comes from the name of POSIX function. */
grub_util_error (_("cannot stat `%s': %s"), name, strerror (errno));
#if GRUB_DISK_DEVS_ARE_CHAR
if (S_ISCHR (st.st_mode))
#else
if (S_ISBLK (st.st_mode))
#endif
ret = grub_util_get_fd_size_os (fd, name, log_secsize);
if (ret != -1LL)
return ret;
if (log_secsize)
*log_secsize = 9;
return st.st_size;
}
#if defined(__linux__) && (!defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))))
/* Maybe libc doesn't have large file support. */
grub_err_t
grub_util_fd_seek (grub_util_fd_t fd, const char *name, grub_uint64_t off)
{
loff_t offset, result;
static int _llseek (uint filedes, ulong hi, ulong lo,
loff_t *res, uint wh);
_syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
offset = (loff_t) off;
if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET))
return grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot seek `%s': %s"),
name, strerror (errno));
return GRUB_ERR_NONE;
}
#else
grub_err_t
grub_util_fd_seek (grub_util_fd_t fd, const char *name, grub_uint64_t off)
{
off_t offset = (off_t) off;
if (lseek (fd, offset, SEEK_SET) != offset)
return grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot seek `%s': %s"),
name, strerror (errno));
return 0;
}
#endif
/* Read LEN bytes from FD in BUF. Return less than or equal to zero if an
error occurs, otherwise return LEN. */
ssize_t
grub_util_fd_read (grub_util_fd_t fd, char *buf, size_t len)
{
ssize_t size = len;
while (len)
{
ssize_t ret = read (fd, buf, len);
if (ret <= 0)
{
if (errno == EINTR)
continue;
else
return ret;
}
len -= ret;
buf += ret;
}
return size;
}
/* Write LEN bytes from BUF to FD. Return less than or equal to zero if an
error occurs, otherwise return LEN. */
ssize_t
grub_util_fd_write (grub_util_fd_t fd, const char *buf, size_t len)
{
ssize_t size = len;
while (len)
{
ssize_t ret = write (fd, buf, len);
if (ret <= 0)
{
if (errno == EINTR)
continue;
else
return ret;
}
len -= ret;
buf += ret;
}
return size;
}
#if !defined (__NetBSD__) && !defined (__APPLE__) && !defined (__FreeBSD__) && !defined(__FreeBSD_kernel__)
grub_util_fd_t
grub_util_fd_open (const char *os_dev, int flags)
{
#ifdef O_LARGEFILE
flags |= O_LARGEFILE;
#endif
#ifdef O_BINARY
flags |= O_BINARY;
#endif
return open (os_dev, flags);
}
#endif
const char *
grub_util_fd_strerror (void)
{
return strerror (errno);
}
void
grub_util_fd_sync (grub_util_fd_t fd)
{
fsync (fd);
}
void
grub_util_fd_close (grub_util_fd_t fd)
{
close (fd);
}
char *
canonicalize_file_name (const char *path)
{
#if defined (PATH_MAX)
char *ret;
ret = xmalloc (PATH_MAX);
if (!realpath (path, ret))
return NULL;
return ret;
#else
return realpath (path, NULL);
#endif
}
#endif