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

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/* 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>
#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;
}
int
grub_util_fd_seek (grub_util_fd_t fd, grub_uint64_t off)
{
#if SIZEOF_OFF_T == 8
off_t offset = (off_t) off;
if (lseek (fd, offset, SEEK_SET) != offset)
return -1;
#elif SIZEOF_OFF64_T == 8
off64_t offset = (off64_t) off;
if (lseek64 (fd, offset, SEEK_SET) != offset)
return -1;
#else
#error "No large file support"
#endif
return 0;
}
/* 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 = 0;
while (len)
{
ssize_t ret = read (fd, buf, len);
if (ret == 0)
break;
if (ret < 0)
{
if (errno == EINTR)
continue;
else
return ret;
}
len -= ret;
buf += ret;
size += 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 = 0;
while (len)
{
ssize_t ret = write (fd, buf, len);
if (ret == 0)
break;
if (ret < 0)
{
if (errno == EINTR)
continue;
else
return ret;
}
len -= ret;
buf += ret;
size += 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, S_IROTH | S_IRGRP | S_IRUSR | S_IWUSR);
}
#endif
const char *
grub_util_fd_strerror (void)
{
return strerror (errno);
}
static int allow_fd_syncs = 1;
int
grub_util_fd_sync (grub_util_fd_t fd)
{
if (allow_fd_syncs)
return fsync (fd);
return 0;
}
int
grub_util_file_sync (FILE *f)
{
if (fflush (f) != 0)
return -1;
if (!allow_fd_syncs)
return 0;
return fsync (fileno (f));
}
void
grub_util_disable_fd_syncs (void)
{
allow_fd_syncs = 0;
}
int
grub_util_fd_close (grub_util_fd_t fd)
{
return close (fd);
}
char *
grub_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
}
FILE *
grub_util_fopen (const char *path, const char *mode)
{
return fopen (path, mode);
}
int
grub_util_is_directory (const char *path)
{
struct stat st;
if (stat (path, &st) == -1)
return 0;
return S_ISDIR (st.st_mode);
}
int
grub_util_is_regular (const char *path)
{
struct stat st;
if (stat (path, &st) == -1)
return 0;
return S_ISREG (st.st_mode);
}
grub_uint32_t
grub_util_get_mtime (const char *path)
{
struct stat st;
if (stat (path, &st) == -1)
return 0;
return st.st_mtime;
}
#endif
#if defined (__CYGWIN__) || (!defined (__MINGW32__) && !defined (__AROS__))
int
grub_util_is_special_file (const char *path)
{
struct stat st;
if (lstat (path, &st) == -1)
return 1;
return (!S_ISREG (st.st_mode) && !S_ISDIR (st.st_mode));
}
char *
grub_util_make_temporary_file (void)
{
const char *t = getenv ("TMPDIR");
size_t tl;
char *tmp;
if (!t)
t = "/tmp";
tl = strlen (t);
tmp = xmalloc (tl + sizeof ("/grub.XXXXXX"));
memcpy (tmp, t, tl);
memcpy (tmp + tl, "/grub.XXXXXX",
sizeof ("/grub.XXXXXX"));
if (mkstemp (tmp) == -1)
grub_util_error (_("cannot make temporary file: %s"), strerror (errno));
return tmp;
}
char *
grub_util_make_temporary_dir (void)
{
const char *t = getenv ("TMPDIR");
size_t tl;
char *tmp;
if (!t)
t = "/tmp";
tl = strlen (t);
tmp = xmalloc (tl + sizeof ("/grub.XXXXXX"));
memcpy (tmp, t, tl);
memcpy (tmp + tl, "/grub.XXXXXX",
sizeof ("/grub.XXXXXX"));
if (!mkdtemp (tmp))
grub_util_error (_("cannot make temporary directory: %s"),
strerror (errno));
return tmp;
}
#endif