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Move UART implementation for Windows in dedicated directory

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This commit is contained in:
Romuald Conty 2013-03-18 23:46:14 +01:00
parent a422ae2211
commit cb3452db7b
5 changed files with 374 additions and 401 deletions
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11
libnfc/buses/uart_win32.c → contrib/win32/libnfc/buses/uart.c
View file

@ -25,10 +25,19 @@
*/
/**
* @file uart_win32.c
* @file uart.c
* @brief Windows UART driver
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif // HAVE_CONFIG_H
#include "uart.h"
#include <nfc/nfc.h>
#include "nfc-internal.h"
#include <inttypes.h>
#include "log.h"

7
libnfc/CMakeLists.txt
View file

@ -17,7 +17,12 @@ IF(USB_REQUIRED)
ENDIF(USB_REQUIRED)
IF(UART_REQUIRED)
LIST(APPEND BUSES_SOURCES buses/uart)
IF(WIN32)
# Windows have a special implementation for UART
LIST(APPEND BUSES_SOURCES ../contrib/win32/libnfc/buses/uart)
ELSE(WIN32)
LIST(APPEND BUSES_SOURCES buses/uart)
ENDIF(WIN32)
ENDIF(UART_REQUIRED)
INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/buses)

2
libnfc/buses/Makefile.am
View file

@ -13,7 +13,7 @@ if UART_ENABLED
libnfcbuses_la_CFLAGS +=
libnfcbuses_la_LIBADD +=
endif
EXTRA_DIST += uart.c uart.h uart_posix.c uart_win32.c
EXTRA_DIST += uart.c uart.h
if LIBUSB_ENABLED
libnfcbuses_la_SOURCES += usbbus.c usbbus.h

366
libnfc/buses/uart.c
View file

@ -26,7 +26,7 @@
/**
* @file uart.c
* @brief UART driver wrapper
* @brief UART driver
*/
#ifdef HAVE_CONFIG_H
@ -35,14 +35,362 @@
#include "uart.h"
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <stdlib.h>
#include <nfc/nfc.h>
#include "nfc-internal.h"
// Test if we are dealing with unix operating systems
#ifndef _WIN32
// The POSIX serial port implementation
# include "uart_posix.c"
#else
// The windows serial port implementation
# include "uart_win32.c"
#endif /* _WIN32 */
#define LOG_GROUP NFC_LOG_GROUP_COM
#define LOG_CATEGORY "libnfc.bus.uart"
# if defined(__APPLE__)
const char *serial_ports_device_radix[] = { "tty.SLAB_USBtoUART", "tty.usbserial-", NULL };
# elif defined (__FreeBSD__) || defined (__OpenBSD__)
const char *serial_ports_device_radix[] = { "cuaU", "cuau", NULL };
# elif defined (__linux__)
const char *serial_ports_device_radix[] = { "ttyUSB", "ttyS", "ttyACM", "ttyAMA", NULL };
# else
# error "Can't determine serial string for your system"
# endif
// Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
# define CCLAIMED 0x80000000
struct serial_port_unix {
int fd; // Serial port file descriptor
struct termios termios_backup; // Terminal info before using the port
struct termios termios_new; // Terminal info during the transaction
};
#define UART_DATA( X ) ((struct serial_port_unix *) X)
void uart_close_ext(const serial_port sp, const bool restore_termios);
serial_port
uart_open(const char *pcPortName)
{
struct serial_port_unix *sp = malloc(sizeof(struct serial_port_unix));
if (sp == 0)
return INVALID_SERIAL_PORT;
sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (sp->fd == -1) {
uart_close_ext(sp, false);
return INVALID_SERIAL_PORT;
}
if (tcgetattr(sp->fd, &sp->termios_backup) == -1) {
uart_close_ext(sp, false);
return INVALID_SERIAL_PORT;
}
// Make sure the port is not claimed already
if (sp->termios_backup.c_iflag & CCLAIMED) {
uart_close_ext(sp, false);
return CLAIMED_SERIAL_PORT;
}
// Copy the old terminal info struct
sp->termios_new = sp->termios_backup;
sp->termios_new.c_cflag = CS8 | CLOCAL | CREAD;
sp->termios_new.c_iflag = CCLAIMED | IGNPAR;
sp->termios_new.c_oflag = 0;
sp->termios_new.c_lflag = 0;
sp->termios_new.c_cc[VMIN] = 0; // block until n bytes are received
sp->termios_new.c_cc[VTIME] = 0; // block until a timer expires (n * 100 mSec.)
if (tcsetattr(sp->fd, TCSANOW, &sp->termios_new) == -1) {
uart_close_ext(sp, true);
return INVALID_SERIAL_PORT;
}
return sp;
}
void
uart_flush_input(serial_port sp)
{
// This line seems to produce absolutely no effect on my system (GNU/Linux 2.6.35)
tcflush(UART_DATA(sp)->fd, TCIFLUSH);
// So, I wrote this byte-eater
// Retrieve the count of the incoming bytes
int available_bytes_count = 0;
int res;
res = ioctl(UART_DATA(sp)->fd, FIONREAD, &available_bytes_count);
if (res != 0) {
return;
}
if (available_bytes_count == 0) {
return;
}
char *rx = malloc(available_bytes_count);
if (!rx) {
perror("malloc");
return;
}
// There is something available, read the data
(void)read(UART_DATA(sp)->fd, rx, available_bytes_count);
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%d bytes have eatten.", available_bytes_count);
free(rx);
}
void
uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
{
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Serial port speed requested to be set to %d bauds.", uiPortSpeed);
// Portability note: on some systems, B9600 != 9600 so we have to do
// uint32_t <=> speed_t associations by hand.
speed_t stPortSpeed = B9600;
switch (uiPortSpeed) {
case 9600:
stPortSpeed = B9600;
break;
case 19200:
stPortSpeed = B19200;
break;
case 38400:
stPortSpeed = B38400;
break;
# ifdef B57600
case 57600:
stPortSpeed = B57600;
break;
# endif
# ifdef B115200
case 115200:
stPortSpeed = B115200;
break;
# endif
# ifdef B230400
case 230400:
stPortSpeed = B230400;
break;
# endif
# ifdef B460800
case 460800:
stPortSpeed = B460800;
break;
# endif
default:
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "Unable to set serial port speed to %d bauds. Speed value must be one of those defined in termios(3).",
uiPortSpeed);
return;
};
// Set port speed (Input and Output)
cfsetispeed(&(UART_DATA(sp)->termios_new), stPortSpeed);
cfsetospeed(&(UART_DATA(sp)->termios_new), stPortSpeed);
if (tcsetattr(UART_DATA(sp)->fd, TCSADRAIN, &(UART_DATA(sp)->termios_new)) == -1) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Unable to apply new speed settings.");
}
}
uint32_t
uart_get_speed(serial_port sp)
{
uint32_t uiPortSpeed = 0;
switch (cfgetispeed(&UART_DATA(sp)->termios_new)) {
case B9600:
uiPortSpeed = 9600;
break;
case B19200:
uiPortSpeed = 19200;
break;
case B38400:
uiPortSpeed = 38400;
break;
# ifdef B57600
case B57600:
uiPortSpeed = 57600;
break;
# endif
# ifdef B115200
case B115200:
uiPortSpeed = 115200;
break;
# endif
# ifdef B230400
case B230400:
uiPortSpeed = 230400;
break;
# endif
# ifdef B460800
case B460800:
uiPortSpeed = 460800;
break;
# endif
}
return uiPortSpeed;
}
void
uart_close_ext(const serial_port sp, const bool restore_termios)
{
if (UART_DATA(sp)->fd >= 0) {
if (restore_termios)
tcsetattr(UART_DATA(sp)->fd, TCSANOW, &UART_DATA(sp)->termios_backup);
close(UART_DATA(sp)->fd);
}
free(sp);
}
void
uart_close(const serial_port sp)
{
uart_close_ext(sp, true);
}
/**
* @brief Receive data from UART and copy data to \a pbtRx
*
* @return 0 on success, otherwise driver error code
*/
int
uart_receive(serial_port sp, uint8_t *pbtRx, const size_t szRx, void *abort_p, int timeout)
{
int iAbortFd = abort_p ? *((int *)abort_p) : 0;
int received_bytes_count = 0;
int available_bytes_count = 0;
const int expected_bytes_count = (int)szRx;
int res;
fd_set rfds;
do {
select:
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(UART_DATA(sp)->fd, &rfds);
if (iAbortFd) {
FD_SET(iAbortFd, &rfds);
}
struct timeval timeout_tv;
if (timeout > 0) {
timeout_tv.tv_sec = (timeout / 1000);
timeout_tv.tv_usec = ((timeout % 1000) * 1000);
}
res = select(MAX(UART_DATA(sp)->fd, iAbortFd) + 1, &rfds, NULL, NULL, timeout ? &timeout_tv : NULL);
if ((res < 0) && (EINTR == errno)) {
// The system call was interupted by a signal and a signal handler was
// run. Restart the interupted system call.
goto select;
}
// Read error
if (res < 0) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Error: %s", strerror(errno));
return NFC_EIO;
}
// Read time-out
if (res == 0) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%s", "Timeout!");
return NFC_ETIMEOUT;
}
if (FD_ISSET(iAbortFd, &rfds)) {
// Abort requested
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%s", "Abort!");
close(iAbortFd);
return NFC_EOPABORTED;
}
// Retrieve the count of the incoming bytes
res = ioctl(UART_DATA(sp)->fd, FIONREAD, &available_bytes_count);
if (res != 0) {
return NFC_EIO;
}
// There is something available, read the data
res = read(UART_DATA(sp)->fd, pbtRx + received_bytes_count, MIN(available_bytes_count, (expected_bytes_count - received_bytes_count)));
// Stop if the OS has some troubles reading the data
if (res <= 0) {
return NFC_EIO;
}
received_bytes_count += res;
} while (expected_bytes_count > received_bytes_count);
LOG_HEX(LOG_GROUP, "RX", pbtRx, szRx);
return NFC_SUCCESS;
}
/**
* @brief Send \a pbtTx content to UART
*
* @return 0 on success, otherwise a driver error is returned
*/
int
uart_send(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout)
{
(void) timeout;
LOG_HEX(LOG_GROUP, "TX", pbtTx, szTx);
if ((int) szTx == write(UART_DATA(sp)->fd, pbtTx, szTx))
return NFC_SUCCESS;
else
return NFC_EIO;
}
char **
uart_list_ports(void)
{
char **res = malloc(sizeof(char *));
if (!res) {
perror("malloc");
return res;
}
size_t szRes = 1;
res[0] = NULL;
DIR *dir;
if ((dir = opendir("/dev")) == NULL) {
perror("opendir error: /dev");
return res;
}
struct dirent entry;
struct dirent *result;
while ((readdir_r(dir, &entry, &result) == 0) && (result != NULL)) {
#if !defined(__APPLE__)
if (!isdigit(entry.d_name[strlen(entry.d_name) - 1]))
continue;
#endif
const char **p = serial_ports_device_radix;
while (*p) {
if (!strncmp(entry.d_name, *p, strlen(*p))) {
char **res2 = realloc(res, (szRes + 1) * sizeof(char *));
if (!res2) {
perror("malloc");
goto oom;
}
res = res2;
if (!(res[szRes - 1] = malloc(6 + strlen(entry.d_name)))) {
perror("malloc");
goto oom;
}
sprintf(res[szRes - 1], "/dev/%s", entry.d_name);
szRes++;
res[szRes - 1] = NULL;
}
p++;
}
}
oom:
closedir(dir);
return res;
}

389
libnfc/buses/uart_posix.c
View file

@ -1,389 +0,0 @@
/*-
* Free/Libre Near Field Communication (NFC) library
*
* Libnfc historical contributors:
* Copyright (C) 2009 Roel Verdult
* Copyright (C) 2009-2013 Romuald Conty
* Copyright (C) 2010-2012 Romain Tartière
* Copyright (C) 2010-2013 Philippe Teuwen
* Copyright (C) 2012-2013 Ludovic Rousseau
* Additional contributors of this file:
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/**
* @file uart_posix.c
* @brief POSIX UART driver
*/
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <stdlib.h>
#include "nfc-internal.h"
#define LOG_GROUP NFC_LOG_GROUP_COM
#define LOG_CATEGORY "libnfc.bus.uart"
# if defined(__APPLE__)
const char *serial_ports_device_radix[] = { "tty.SLAB_USBtoUART", "tty.usbserial-", NULL };
# elif defined (__FreeBSD__) || defined (__OpenBSD__)
const char *serial_ports_device_radix[] = { "cuaU", "cuau", NULL };
# elif defined (__linux__)
const char *serial_ports_device_radix[] = { "ttyUSB", "ttyS", "ttyACM", "ttyAMA", NULL };
# else
# error "Can't determine serial string for your system"
# endif
// Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
# define CCLAIMED 0x80000000
struct serial_port_unix {
int fd; // Serial port file descriptor
struct termios termios_backup; // Terminal info before using the port
struct termios termios_new; // Terminal info during the transaction
};
#define UART_DATA( X ) ((struct serial_port_unix *) X)
void uart_close_ext(const serial_port sp, const bool restore_termios);
serial_port
uart_open(const char *pcPortName)
{
struct serial_port_unix *sp = malloc(sizeof(struct serial_port_unix));
if (sp == 0)
return INVALID_SERIAL_PORT;
sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (sp->fd == -1) {
uart_close_ext(sp, false);
return INVALID_SERIAL_PORT;
}
if (tcgetattr(sp->fd, &sp->termios_backup) == -1) {
uart_close_ext(sp, false);
return INVALID_SERIAL_PORT;
}
// Make sure the port is not claimed already
if (sp->termios_backup.c_iflag & CCLAIMED) {
uart_close_ext(sp, false);
return CLAIMED_SERIAL_PORT;
}
// Copy the old terminal info struct
sp->termios_new = sp->termios_backup;
sp->termios_new.c_cflag = CS8 | CLOCAL | CREAD;
sp->termios_new.c_iflag = CCLAIMED | IGNPAR;
sp->termios_new.c_oflag = 0;
sp->termios_new.c_lflag = 0;
sp->termios_new.c_cc[VMIN] = 0; // block until n bytes are received
sp->termios_new.c_cc[VTIME] = 0; // block until a timer expires (n * 100 mSec.)
if (tcsetattr(sp->fd, TCSANOW, &sp->termios_new) == -1) {
uart_close_ext(sp, true);
return INVALID_SERIAL_PORT;
}
return sp;
}
void
uart_flush_input(serial_port sp)
{
// This line seems to produce absolutely no effect on my system (GNU/Linux 2.6.35)
tcflush(UART_DATA(sp)->fd, TCIFLUSH);
// So, I wrote this byte-eater
// Retrieve the count of the incoming bytes
int available_bytes_count = 0;
int res;
res = ioctl(UART_DATA(sp)->fd, FIONREAD, &available_bytes_count);
if (res != 0) {
return;
}
if (available_bytes_count == 0) {
return;
}
char *rx = malloc(available_bytes_count);
if (!rx) {
perror("malloc");
return;
}
// There is something available, read the data
(void)read(UART_DATA(sp)->fd, rx, available_bytes_count);
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%d bytes have eatten.", available_bytes_count);
free(rx);
}
void
uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
{
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Serial port speed requested to be set to %d bauds.", uiPortSpeed);
// Portability note: on some systems, B9600 != 9600 so we have to do
// uint32_t <=> speed_t associations by hand.
speed_t stPortSpeed = B9600;
switch (uiPortSpeed) {
case 9600:
stPortSpeed = B9600;
break;
case 19200:
stPortSpeed = B19200;
break;
case 38400:
stPortSpeed = B38400;
break;
# ifdef B57600
case 57600:
stPortSpeed = B57600;
break;
# endif
# ifdef B115200
case 115200:
stPortSpeed = B115200;
break;
# endif
# ifdef B230400
case 230400:
stPortSpeed = B230400;
break;
# endif
# ifdef B460800
case 460800:
stPortSpeed = B460800;
break;
# endif
default:
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "Unable to set serial port speed to %d bauds. Speed value must be one of those defined in termios(3).",
uiPortSpeed);
return;
};
// Set port speed (Input and Output)
cfsetispeed(&(UART_DATA(sp)->termios_new), stPortSpeed);
cfsetospeed(&(UART_DATA(sp)->termios_new), stPortSpeed);
if (tcsetattr(UART_DATA(sp)->fd, TCSADRAIN, &(UART_DATA(sp)->termios_new)) == -1) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "%s", "Unable to apply new speed settings.");
}
}
uint32_t
uart_get_speed(serial_port sp)
{
uint32_t uiPortSpeed = 0;
switch (cfgetispeed(&UART_DATA(sp)->termios_new)) {
case B9600:
uiPortSpeed = 9600;
break;
case B19200:
uiPortSpeed = 19200;
break;
case B38400:
uiPortSpeed = 38400;
break;
# ifdef B57600
case B57600:
uiPortSpeed = 57600;
break;
# endif
# ifdef B115200
case B115200:
uiPortSpeed = 115200;
break;
# endif
# ifdef B230400
case B230400:
uiPortSpeed = 230400;
break;
# endif
# ifdef B460800
case B460800:
uiPortSpeed = 460800;
break;
# endif
}
return uiPortSpeed;
}
void
uart_close_ext(const serial_port sp, const bool restore_termios)
{
if (UART_DATA(sp)->fd >= 0) {
if (restore_termios)
tcsetattr(UART_DATA(sp)->fd, TCSANOW, &UART_DATA(sp)->termios_backup);
close(UART_DATA(sp)->fd);
}
free(sp);
}
void
uart_close(const serial_port sp)
{
uart_close_ext(sp, true);
}
/**
* @brief Receive data from UART and copy data to \a pbtRx
*
* @return 0 on success, otherwise driver error code
*/
int
uart_receive(serial_port sp, uint8_t *pbtRx, const size_t szRx, void *abort_p, int timeout)
{
int iAbortFd = abort_p ? *((int *)abort_p) : 0;
int received_bytes_count = 0;
int available_bytes_count = 0;
const int expected_bytes_count = (int)szRx;
int res;
fd_set rfds;
do {
select:
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(UART_DATA(sp)->fd, &rfds);
if (iAbortFd) {
FD_SET(iAbortFd, &rfds);
}
struct timeval timeout_tv;
if (timeout > 0) {
timeout_tv.tv_sec = (timeout / 1000);
timeout_tv.tv_usec = ((timeout % 1000) * 1000);
}
res = select(MAX(UART_DATA(sp)->fd, iAbortFd) + 1, &rfds, NULL, NULL, timeout ? &timeout_tv : NULL);
if ((res < 0) && (EINTR == errno)) {
// The system call was interupted by a signal and a signal handler was
// run. Restart the interupted system call.
goto select;
}
// Read error
if (res < 0) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "Error: %s", strerror(errno));
return NFC_EIO;
}
// Read time-out
if (res == 0) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%s", "Timeout!");
return NFC_ETIMEOUT;
}
if (FD_ISSET(iAbortFd, &rfds)) {
// Abort requested
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_DEBUG, "%s", "Abort!");
close(iAbortFd);
return NFC_EOPABORTED;
}
// Retrieve the count of the incoming bytes
res = ioctl(UART_DATA(sp)->fd, FIONREAD, &available_bytes_count);
if (res != 0) {
return NFC_EIO;
}
// There is something available, read the data
res = read(UART_DATA(sp)->fd, pbtRx + received_bytes_count, MIN(available_bytes_count, (expected_bytes_count - received_bytes_count)));
// Stop if the OS has some troubles reading the data
if (res <= 0) {
return NFC_EIO;
}
received_bytes_count += res;
} while (expected_bytes_count > received_bytes_count);
LOG_HEX(LOG_GROUP, "RX", pbtRx, szRx);
return NFC_SUCCESS;
}
/**
* @brief Send \a pbtTx content to UART
*
* @return 0 on success, otherwise a driver error is returned
*/
int
uart_send(serial_port sp, const uint8_t *pbtTx, const size_t szTx, int timeout)
{
(void) timeout;
LOG_HEX(LOG_GROUP, "TX", pbtTx, szTx);
if ((int) szTx == write(UART_DATA(sp)->fd, pbtTx, szTx))
return NFC_SUCCESS;
else
return NFC_EIO;
}
char **
uart_list_ports(void)
{
char **res = malloc(sizeof(char *));
if (!res) {
perror("malloc");
return res;
}
size_t szRes = 1;
res[0] = NULL;
DIR *dir;
if ((dir = opendir("/dev")) == NULL) {
perror("opendir error: /dev");
return res;
}
struct dirent entry;
struct dirent *result;
while ((readdir_r(dir, &entry, &result) == 0) && (result != NULL)) {
#if !defined(__APPLE__)
if (!isdigit(entry.d_name[strlen(entry.d_name) - 1]))
continue;
#endif
const char **p = serial_ports_device_radix;
while (*p) {
if (!strncmp(entry.d_name, *p, strlen(*p))) {
char **res2 = realloc(res, (szRes + 1) * sizeof(char *));
if (!res2) {
perror("malloc");
goto oom;
}
res = res2;
if (!(res[szRes - 1] = malloc(6 + strlen(entry.d_name)))) {
perror("malloc");
goto oom;
}
sprintf(res[szRes - 1], "/dev/%s", entry.d_name);
szRes++;
res[szRes - 1] = NULL;
}
p++;
}
}
oom:
closedir(dir);
return res;
}