error : QProcessPrivate::createPipe: Cannot create pipe 0x2ed031ac: Too many open files
Solved
Mobile and Embedded
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Hello everyone,
i am working on ARM based board interfacing with fingerprint module project and working on qt creator for coding my program is running properly but after 5 hours my finger print module stop working and when i see in serial port terminal it show the
error :QProcessPrivate::createPipe: Cannot create pipe 0x2ed031ac: Too many open files
anyone know what it means??
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Hi,
That your system is opening a lot of files and is not closing them. Are you creating lots of QProcess in your application ? If so, are you also delete them properly ?
By the way, what version of Qt are you using ?
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What about my other questions ?
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sorry for late reply...
I am having a separate thread in which i am executing process as follow in while loop.
I am just calling slot in thread. And expect the called script perform some task.
this is only QProcess i am using currently.
///// php.h ////// #ifndef php_THREAD_H #define php_THREAD_H #include <QObject> #include <QDateTime> #include <QFile> #include <QtGui> #include <QtCore> class php : public QObject { Q_OBJECT public Q_SLOTS: void phpScripts(); }; #endif // php_THREAD_H///// php.cpp /// #include <QObject> #include <QDateTime> #include <QFile> #include <QtGui> #include <QtCore> #include "php.h" #include <QProcess> #include <QtNetwork/QHostAddress> #include <QtNetwork/QNetworkInterface> #include <QFileInfo> void php::phpScripts(){ while(1){ QProcess::execute("sh /usr/test/shells/sysConfig.sh"); } }//// main.cpp /// #include "qtquick1applicationviewer.h" #include <QApplication> #include <QtDeclarative> #include <QDeclarativeContext> #include <QDeclarativeView> #include <QtDebug> #include "ApplicationData.h" #include "php.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); //ApplicationData data; QtQuick1ApplicationViewer viewer; FileHandling data1; viewer.addImportPath(QLatin1String("modules")); viewer.setOrientation(QtQuick1ApplicationViewer::ScreenOrientationAuto); viewer.setMainQmlFile(QLatin1String("qrc:/home.qml")); //php Thread QThread *t3 = new QThread; php *phpThread = new php; phpThread->moveToThread(t3); QObject::connect(t3,SIGNAL(started()), phpThread, SLOT(phpScripts())); qDebug() << "hello from GUI thread " << app.thread()->currentThreadId(); t3->start();//php thread app.exec(); return 0; } -
In your slot you have an infinite loop that is creating indefinitely QProcess objects that execute the
sysConfig.shscript but you never check whether something went wrong with it.What does that script do ? How do you know it executed successfully ? Does it close everything it has opened ?
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Also from the PHP files ?
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yes i have check also in php files that are called in my code everything is ok but still get the same issue after some time get the above error again n agian and finger print module stop working...
my doubt :: if something was missing about closing file then error must appeared early, above error i get after 4-5 hours application run.
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How are you accessing that reader ?
What does your PHP scripts do ?
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i am using CAMA SM20 finger print module communicating via UART communication.
in my application there are 2 diffrent threads for php and fingerprint module.
fingerprint module thread does some stuff like collecting data and storing in file.
and php thread include some php script to read text file and uploading to server using webserice. (the text file php read is actually created and update by fingerprint module on run time) -
Can you share the code you use for the serial port communication ?
One thing you can do is use
lsofto see what files are being constantly opened and by what. -
[root@Atishay build-QT_FP_RFID-QT_4_8_6-Debug]# lsof 1 /bin/busybox /dev/console 1 /bin/busybox /dev/console 1 /bin/busybox /dev/console 1512 /sbin/udevd /dev/null 1512 /sbin/udevd /dev/null 1512 /sbin/udevd /dev/null 1512 /sbin/udevd anon_inode:inotify 1512 /sbin/udevd socket:[1031] 1512 /sbin/udevd socket:[1032] 1512 /sbin/udevd pipe:[1033] 1512 /sbin/udevd pipe:[1033] 3246 /usr/sbin/inetd /dev/null 3246 /usr/sbin/inetd /dev/null 3246 /usr/sbin/inetd /dev/null 3246 /usr/sbin/inetd socket:[306] 3246 /usr/sbin/inetd socket:[307] 3246 /usr/sbin/inetd socket:[308] 3246 /usr/sbin/inetd socket:[309] 3246 /usr/sbin/inetd socket:[310] 3246 /usr/sbin/inetd socket:[311] 3246 /usr/sbin/inetd socket:[312] 3249 /usr/sbin/boa /dev/null 3249 /usr/sbin/boa /var/log/boa/access_log 3249 /usr/sbin/boa /var/log/boa/error_log 3249 /usr/sbin/boa socket:[1246] 3344 /bin/bash /dev/console 3344 /bin/bash /dev/console 3344 /bin/bash /dev/console 3344 /bin/bash /etc/rc.d/rc_mxc.S 3348 /bin/bash /dev/ttymxc0 3348 /bin/bash /dev/ttymxc0 3348 /bin/bash /dev/ttymxc0 3348 /bin/bash /dev/ttymxc0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9936] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9936] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9938] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9938] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID socket:[9939] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/fb0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/tty0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/input/mouse0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/input/event1 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/tty0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID socket:[9941] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /tmp/qtembedded-0/fonts/dejavu_sans_20_50.qsf 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /tmp/qtembedded-0/fonts/dejavu_sans_40_50.qsf 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[13498] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[13498] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[15454] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[15454] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[14820] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[14820] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/spidev0.0 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[13499] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[13499] 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 8343 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2above is the log for lsof command when my application running...
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**before application running output=>** [root@Atishay root]# lsof 1 /bin/busybox /dev/console 1 /bin/busybox /dev/console 1 /bin/busybox /dev/console 1498 /sbin/udevd /dev/null 1498 /sbin/udevd /dev/null 1498 /sbin/udevd /dev/null 1498 /sbin/udevd anon_inode:inotify 1498 /sbin/udevd socket:[1525] 1498 /sbin/udevd socket:[1526] 1498 /sbin/udevd pipe:[1527] 1498 /sbin/udevd pipe:[1527] 2653 /usr/sbin/inetd /dev/null 2653 /usr/sbin/inetd /dev/null 2653 /usr/sbin/inetd /dev/null 2653 /usr/sbin/inetd socket:[2860] 2653 /usr/sbin/inetd socket:[2861] 2653 /usr/sbin/inetd socket:[2862] 2653 /usr/sbin/inetd socket:[2863] 2653 /usr/sbin/inetd socket:[2864] 2653 /usr/sbin/inetd socket:[2865] 2653 /usr/sbin/inetd socket:[2866] 2656 /usr/sbin/boa /dev/null 2656 /usr/sbin/boa /var/log/boa/access_log 2656 /usr/sbin/boa /var/log/boa/error_log 2656 /usr/sbin/boa socket:[3527] 2750 /bin/bash /dev/console 2750 /bin/bash /dev/console 2750 /bin/bash /dev/console 2750 /bin/bash /etc/rc.d/rc_mxc.S 2753 /bin/bash /dev/ttymxc0 2753 /bin/bash /dev/ttymxc0 2753 /bin/bash /dev/ttymxc0 2753 /bin/bash /dev/ttymxc0 **after application running output=>** 1 /bin/busybox /dev/console 1 /bin/busybox /dev/console 1 /bin/busybox /dev/console 1498 /sbin/udevd /dev/null 1498 /sbin/udevd /dev/null 1498 /sbin/udevd /dev/null 1498 /sbin/udevd anon_inode:inotify 1498 /sbin/udevd socket:[1525] 1498 /sbin/udevd socket:[1526] 1498 /sbin/udevd pipe:[1527] 1498 /sbin/udevd pipe:[1527] 2653 /usr/sbin/inetd /dev/null 2653 /usr/sbin/inetd /dev/null 2653 /usr/sbin/inetd /dev/null 2653 /usr/sbin/inetd socket:[2860] 2653 /usr/sbin/inetd socket:[2861] 2653 /usr/sbin/inetd socket:[2862] 2653 /usr/sbin/inetd socket:[2863] 2653 /usr/sbin/inetd socket:[2864] 2653 /usr/sbin/inetd socket:[2865] 2653 /usr/sbin/inetd socket:[2866] 2656 /usr/sbin/boa /dev/null 2656 /usr/sbin/boa /var/log/boa/access_log 2656 /usr/sbin/boa /var/log/boa/error_log 2656 /usr/sbin/boa socket:[3527] 2750 /bin/bash /dev/console 2750 /bin/bash /dev/console 2750 /bin/bash /dev/console 2750 /bin/bash /etc/rc.d/rc_mxc.S 2753 /bin/bash /dev/ttymxc0 2753 /bin/bash /dev/ttymxc0 2753 /bin/bash /dev/ttymxc0 2753 /bin/bash /dev/ttymxc0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9913] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9913] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9915] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[9915] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID socket:[9916] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/fb0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/tty0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/input/mouse0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/input/event1 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/tty0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID socket:[9918] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /tmp/qtembedded-0/fonts/dejavu_sans_20_50.qsf 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /tmp/qtembedded-0/fonts/dejavu_sans_40_50.qsf 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[12299] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[12299] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[11299] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[11299] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[10579] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[10579] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/spidev0.0 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[12300] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID pipe:[12300] 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /tmp/qtembedded-0/fonts/dejavu_sans_14_50.qsf 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /tmp/qtembedded-0/fonts/dejavu_sans_15_75.qsf 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 5604 /usr/test/build-QT_FP_RFID-QT_4_8_6-Debug/QT_FP_RFID /dev/ttymxc2 -
Is it me or does your application open
/dev/ttymxc2very often ?How do you open that device file ?
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Is it me or does your application open
/dev/ttymxc2very often ?How do you open that device file ?
No, in my application i called following function multiple time. fpSetup();// /dev/ttymxc2 open oftenly /******************************************** fpSetup Starts*************************************************** //Description : Setting Up UART peripheral //Input Parameter : void //Return Type : void ************************************************************************************************************/ void fpSetup(void) { //printf("\nSetting Up Fingerprint module...\n"); N=12; SERIAL_ATTR_ST serial_attr; int ret; int channel; channel=2; // UART channel select as per need.. anas fp=UART4_Port_RDWR(channel); // open UART port. ret=UART4_Attr_set(fp,serial_attr); if (RET_SUCCESS == ret) { //printf("\nBaud Rate Set Successful.\n"); } } /************************************************************************************************************ File: serial_test.h (contains all function declaration and definations for interfacing and enabling serial interface ) Author : RnD Team @ Atishay Infotech Date : 18th Jan 2016,Monday,10:57AM Platform : IMX6 board(Cortex A9) + Linux-3.0.35 Toolchain: arm-fsl-linux-gnueabi-gcc-4.6.2 *************************************************************************************************************/ #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <termios.h> #include <errno.h> #include <sys/ioctl.h> #include <pthread.h> #define BUF_SIZE 512 /* *************************** variables ******************************/ char read_buf[BUF_SIZE]; unsigned char N; //char confirmation_data[BUFFER]; /* *************************** Structures ******************************/ typedef struct { char parity; unsigned int baud; unsigned int databits; unsigned int stopbits; } SERIAL_ATTR_ST; /************ Functions **********************/ static int attr_baud_set(int,unsigned int); static void *datas_read(void*); //char rs232_read(); int rs232_transfer(int fd, unsigned char data[], int buf_size); //static int RS232_test(int); void thread_DataRead(int); int UART4_Attr_set(int fd,SERIAL_ATTR_ST serial_attr); int UART4_Port_RDWR(int); //static int RS485_test(int) typedef struct { unsigned int lable; unsigned int baudrate; } SERIAL_BAUD_ST; typedef struct{ unsigned int flags; unsigned int delay_rts_after_send; /* delay after send (milliseconds) */ }SERIAL_RS485_CONF_ST; #define DEBUG 1 #ifdef DEBUG #define DEBUG_INFO(fmt, args...) fprintf(stderr, fmt, ##args) #define DEBUG_ERROR(fmt, args...) fprintf(stderr, fmt"%s\t%s\t%d\n", ##args, __FILE__,__FUNCTION__,__LINE__) #else #define DEBUG_INFO(fmt, args...) #define DEBUG_ERROR(fmt, args...) #endif #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) #define TIMEOUT 1 /* read operation timeout 1s = TIMEOUT/10 */ #define MIN_LEN 128 /* the min len datas */ #define DEV_NAME_LEN 32 #define SERIAL_ATTR_BAUD 9600*N #define SERIAL_ATTR_DATABITS 8 #define SERIAL_ATTR_STOPBITS 1 #define SERIAL_ATTR_PARITY 'n' #define SERIAL_MODE_NORMAL 0 #define SERIAL_MODE_485 1 #define DELAY_RTS_AFTER_SEND 1 /* 1ms */ #define SER_RS485_ENABLED 1 /* 485 enable */ #define RET_SUCCESS 0 #define RET_FAILED -1 static SERIAL_BAUD_ST g_attr_baud[] = { {230400, B230400}, {115200, B115200}, {57600, B57600}, {38400, B38400}, {19200, B19200}, {9600, B9600}, {4800, B4800}, {2400, B2400}, {1800, B1800}, {1200, B1200}, }; static char g_dev_serial[][DEV_NAME_LEN] = { "/dev/ttymxc0", "/dev/ttymxc1", "/dev/ttymxc2", "/dev/ttymxc3", "/dev/ttymxc4", }; static int attr_baud_set(int fd, unsigned int baud) { unsigned int i=0; int ret = RET_SUCCESS; struct termios option; /* get old serial attribute */ memset(&option, 0, sizeof(option)); if (RET_SUCCESS != tcgetattr(fd, &option)) { DEBUG_ERROR("tcgetattr failed.\n"); return RET_FAILED; } for (i=0;i<ARRAY_SIZE(g_attr_baud);i++) { if (baud == g_attr_baud[i].lable) { ret = tcflush(fd, TCIOFLUSH); if (RET_SUCCESS != ret) { // DEBUG_ERROR("tcflush failed.\n"); break; } ret = cfsetispeed(&option, g_attr_baud[i].baudrate); if (RET_SUCCESS != ret) { // DEBUG_ERROR("cfsetispeed failed.\n"); ret = RET_FAILED; break; } ret = cfsetospeed(&option, g_attr_baud[i].baudrate); if (RET_SUCCESS != ret) { //DEBUG_ERROR("cfsetospeed failed.\n"); ret = RET_FAILED; break; } ret = tcsetattr(fd, TCSANOW, &option); if (RET_SUCCESS != ret) { // DEBUG_ERROR("tcsetattr failed.\n"); ret = RET_FAILED; break; } ret = tcflush(fd, TCIOFLUSH); if (RET_SUCCESS != ret) { // DEBUG_ERROR("tcflush failed.\n"); break; } } } return ret; } static int attr_other_set(int fd, SERIAL_ATTR_ST *serial_attr) { struct termios option; /* get old serial attribute */ memset(&option, 0, sizeof(option)); if (RET_SUCCESS != tcgetattr(fd, &option)) { DEBUG_ERROR("tcgetattr failed.\n"); return RET_FAILED; } option.c_iflag = CLOCAL | CREAD; /* set datas size */ option.c_cflag &= ~CSIZE; option.c_iflag = 0; switch (serial_attr->databits) { case 7: option.c_cflag |= CS7; break; case 8: option.c_cflag |= CS8; break; default: DEBUG_ERROR("invalid argument, unsupport datas size.\n"); return RET_FAILED; } /* set parity */ switch (serial_attr->parity) { case 'n': case 'N': option.c_cflag &= ~PARENB; option.c_iflag &= ~INPCK; break; case 'o': case 'O': option.c_cflag |= (PARODD | PARENB); option.c_iflag |= INPCK; break; case 'e': case 'E': option.c_cflag |= PARENB; option.c_cflag &= ~PARODD; option.c_iflag |= INPCK; break; case 's': case 'S': option.c_cflag &= ~PARENB; option.c_cflag &= ~CSTOPB; break; default: DEBUG_ERROR("invalid argument, unsupport parity type.\n"); return RET_FAILED; } /* set stop bits */ switch (serial_attr->stopbits) { case 1: option.c_cflag &= ~CSTOPB; break; case 2: option.c_cflag |= CSTOPB; break; default: DEBUG_ERROR("invalid argument, unsupport stop bits.\n"); return RET_FAILED; } option.c_oflag = 0; option.c_lflag = 0; option.c_cc[VTIME] = TIMEOUT; option.c_cc[VMIN] = MIN_LEN; if (RET_SUCCESS != tcflush(fd,TCIFLUSH)) { DEBUG_ERROR("tcflush failed.\n"); return RET_FAILED; } if (RET_SUCCESS != tcsetattr(fd, TCSANOW, &option)) { DEBUG_ERROR("tcsetattr failed.\n"); return RET_FAILED; } #if 0 tcgetattr(fd, &option); DEBUG_INFO("c_iflag: %x\rc_oflag: %x\n", option.c_iflag, option.c_oflag); DEBUG_INFO("c_cflag: %x\nc_lflag: %x\n", option.c_cflag, option.c_lflag); DEBUG_INFO("c_line: %x\nc_cc[VTIME]: %d\nc_cc[VMIN]: %d\n", option.c_line, option.c_cc[VTIME], option.c_cc[VMIN]); #endif return RET_SUCCESS; } static int attr_set(int fd, SERIAL_ATTR_ST *serial_attr) { int ret = RET_SUCCESS; if (NULL == serial_attr) { DEBUG_ERROR("invalid argument.\n"); return RET_FAILED; } if (RET_SUCCESS == ret) { ret = attr_baud_set(fd, serial_attr->baud); if (RET_SUCCESS == ret) { ret = attr_other_set(fd, serial_attr); } } return ret; } static void *datas_read(void *arg) { int ret=0,i=0,n_data=0; int fd = *(int *)arg; printf("Reading the data...\n"); memset(read_buf, 0, sizeof(read_buf)); for(i=0;i<9;i++) { ret= read(fd, (read_buf+i), sizeof(char)); if(ret){ n_data++; } } DEBUG_INFO("receive %d datas: %s\n", n_data, read_buf); } void thread_DataRead(int fd) { int ret = RET_SUCCESS; pthread_t pid; printf("Creating the Thread for Reading the Data.\n"); ret = pthread_create(&pid, NULL, datas_read, (void *)&fd); if (RET_SUCCESS != ret) { DEBUG_ERROR("can't create thread:%s\n",(char*) strerror); } else printf("Thread created for reading the data.\n"); pthread_cancel(pid); } int rs232_transfer(int fd,unsigned char data[],int buf_size) { unsigned char i; int n_data=0; int ret = RET_SUCCESS; //printf("Writing the data to R305...\n"); for(i=0;i<(buf_size+1);i++) { ret = write(fd, (data+i) , sizeof(char)); //printf("Data Sent:%x\n",data[i]); n_data++; } if ((buf_size+1) != n_data) { printf("Data Write Failed\n"); ret = RET_FAILED; } else //printf("Done.\n"); sleep(1); return ret; } int UART4_Attr_set(int fd,SERIAL_ATTR_ST serial_attr) { int ret; //SERIAL_ATTR_ST serial_attr; //printf("Setting Up the Attributes.\n"); memset(&serial_attr, 0, sizeof(serial_attr)); serial_attr.baud = SERIAL_ATTR_BAUD; serial_attr.databits = SERIAL_ATTR_DATABITS; serial_attr.stopbits = SERIAL_ATTR_STOPBITS; serial_attr.parity = SERIAL_ATTR_PARITY; ret = attr_set(fd, &serial_attr); return ret; } int UART4_Port_RDWR(int channel) { int fd; //int bufsize; //char write_buf[BUF_SIZE]; //DEBUG_INFO("QY-IMX6S-V1.2 RS232 Com channe ss%d \n Start Testing ...\n", channel); fd = open(g_dev_serial[channel], O_RDWR); if (fd < 0) { DEBUG_ERROR("open serial device %s error!\n", g_dev_serial[channel]); return RET_FAILED; } /*memset(write_buf,0,sizeof(write_buf)); snprintf(write_buf, sizeof(write_buf), "Com%d RS232 test string!\n", channel); bufsize = strlen(write_buf) + 1; serial_rs232_test(fd, write_buf, bufsize);*/ return fd; } -
Why not use QSerialPort ?
In any case, I don't see any call to close the file descriptor after use.
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Why not use QSerialPort ?
In any case, I don't see any call to close the file descriptor after use.
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You'll have to build the module yourself (there's a Qt 4 dedicated branch) but otherwise. The documentation is the same.
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You'll have to build the module yourself (there's a Qt 4 dedicated branch) but otherwise. The documentation is the same.
@SGaist :: as far now problem is get fixed and my application running fine. as you help me to point out i am not closing file descriptor, i fix this by simply closing file descriptor and keeping track that no device peripheral left open more than once, at the moment i am using with regular serial port communication, thanx for all your suggestion it really help me alot.
once i finish this application surely i will try to work with QSerialPort :) Thank you once again and have great day ☺
