ardupilot/libraries/AP_Filesystem/AP_Filesystem_posix.cpp

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/*
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
ArduPilot filesystem interface for posix systems
*/
#include "AP_Filesystem.h"
#include <AP_HAL/AP_HAL.h>
#include <AP_Vehicle/AP_Vehicle_Type.h>
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL || CONFIG_HAL_BOARD == HAL_BOARD_LINUX
#if defined(__APPLE__)
#include <sys/mount.h>
#else
#include <sys/vfs.h>
#endif
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#include <utime.h>
extern const AP_HAL::HAL& hal;
/*
map a filename for SITL so operations are relative to the current directory
*/
static const char *map_filename(const char *fname)
{
#if CONFIG_HAL_BOARD == HAL_BOARD_SITL && !APM_BUILD_TYPE(APM_BUILD_Replay)
// on SITL only allow paths under subdirectory. Users can still
// escape with .. if they want to
if (strcmp(fname, "/") == 0) {
return ".";
}
if (*fname == '/') {
fname++;
}
#endif
// on Linux allow original name
return fname;
}
int AP_Filesystem_Posix::open(const char *fname, int flags)
{
FS_CHECK_ALLOWED(-1);
fname = map_filename(fname);
// we automatically add O_CLOEXEC as we always want it for ArduPilot FS usage
return ::open(fname, flags | O_CLOEXEC, 0644);
}
int AP_Filesystem_Posix::close(int fd)
{
FS_CHECK_ALLOWED(-1);
return ::close(fd);
}
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int32_t AP_Filesystem_Posix::read(int fd, void *buf, uint32_t count)
{
FS_CHECK_ALLOWED(-1);
return ::read(fd, buf, count);
}
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int32_t AP_Filesystem_Posix::write(int fd, const void *buf, uint32_t count)
{
FS_CHECK_ALLOWED(-1);
return ::write(fd, buf, count);
}
int AP_Filesystem_Posix::fsync(int fd)
{
FS_CHECK_ALLOWED(-1);
return ::fsync(fd);
}
int32_t AP_Filesystem_Posix::lseek(int fd, int32_t offset, int seek_from)
{
FS_CHECK_ALLOWED(-1);
return ::lseek(fd, offset, seek_from);
}
int AP_Filesystem_Posix::stat(const char *pathname, struct stat *stbuf)
{
FS_CHECK_ALLOWED(-1);
pathname = map_filename(pathname);
return ::stat(pathname, stbuf);
}
int AP_Filesystem_Posix::unlink(const char *pathname)
{
FS_CHECK_ALLOWED(-1);
pathname = map_filename(pathname);
// we match the FATFS interface and use unlink
// for both files and directories
int ret = ::rmdir(pathname);
if (ret == -1) {
ret = ::unlink(pathname);
}
return ret;
}
int AP_Filesystem_Posix::mkdir(const char *pathname)
{
FS_CHECK_ALLOWED(-1);
pathname = map_filename(pathname);
return ::mkdir(pathname, 0775);
}
void *AP_Filesystem_Posix::opendir(const char *pathname)
{
FS_CHECK_ALLOWED(nullptr);
pathname = map_filename(pathname);
return (void*)::opendir(pathname);
}
struct dirent *AP_Filesystem_Posix::readdir(void *dirp)
{
FS_CHECK_ALLOWED(nullptr);
return ::readdir((DIR *)dirp);
}
int AP_Filesystem_Posix::closedir(void *dirp)
{
FS_CHECK_ALLOWED(-1);
return ::closedir((DIR *)dirp);
}
// return free disk space in bytes
int64_t AP_Filesystem_Posix::disk_free(const char *path)
{
FS_CHECK_ALLOWED(-1);
path = map_filename(path);
struct statfs stats;
if (::statfs(path, &stats) < 0) {
return -1;
}
return (((int64_t)stats.f_bavail) * stats.f_bsize);
}
// return total disk space in bytes
int64_t AP_Filesystem_Posix::disk_space(const char *path)
{
FS_CHECK_ALLOWED(-1);
path = map_filename(path);
struct statfs stats;
if (::statfs(path, &stats) < 0) {
return -1;
}
return (((int64_t)stats.f_blocks) * stats.f_bsize);
}
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/*
set mtime on a file
*/
bool AP_Filesystem_Posix::set_mtime(const char *filename, const uint32_t mtime_sec)
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{
FS_CHECK_ALLOWED(false);
filename = map_filename(filename);
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struct utimbuf times {};
times.actime = mtime_sec;
times.modtime = mtime_sec;
return utime(filename, &times) == 0;
}
#endif // CONFIG_HAL_BOARD