Error Resource Temporarily Unavailable Serial Port
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Socket Error Resource Temporarily Unavailable Python
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Error 35 Resource Temporarily Unavailable
them; it only takes a minute: Sign up Linux - serial port read returning EAGAIN up vote 8 down vote favorite 2 I am having some trouble reading some data from a serial port I opened the following way. I've used this instance of code plenty of times and all worked fine, but now, for some reason that I error 11 resource temporarily unavailable cant figure out, I am completely unable to read anything from the serial port. I am able to write and all is correctly received on the other end, but the replies (which are correctly sent) are never received (No, the cables are all ok ;) ) The code I used to open the serial port is the following: fd = open("/dev/ttyUSB0", O_RDWR | O_NONBLOCK | O_NOCTTY); if (fd == -1) { Aviso("Unable to open port"); return (fd); } else { //Get the current options for the port... bzero(&options, sizeof(options)); /* clear struct for new port settings */ tcgetattr(fd, &options); /*-- Set baud rate -------------------------------------------------------*/ if (cfsetispeed(&options, SerialBaudInterp(BaudRate))==-1) perror("On cfsetispeed:"); if (cfsetospeed(&options, SerialBaudInterp(BaudRate))==-1) perror("On cfsetospeed:"); //Enable the receiver and set local mode... options.c_cflag |= (CLOCAL | CREAD); options.c_cflag &= ~PARENB; /* Parity disabled */ options.c_cflag &= ~CSTOPB; options.c_cflag &= ~CSIZE; /* Mask the character size bits */ options.c_cflag |= SerialDataBitsInterp(8); /* CS8 - Selects 8 data bits */ options.c_cflag &= ~CRTSCTS; // disable hardware flow control options.c_iflag &= ~(IXON | IXOFF | IXANY); // disable XON
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ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community eagain Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Can write to, but can't read from serial port ttyS0 http://stackoverflow.com/questions/1613916/linux-serial-port-read-returning-eagain in linux C program up vote 1 down vote favorite I'm trying to learn how to program the ttyS0 serial port in Linux using C. I have another machine connected to my serial port sending alternating hex values of 5f and 6f about every two seconds. I've verified with other port monitoring apps that these values are appearing at the port. In my code I'm using a blocking http://stackoverflow.com/questions/10256105/can-write-to-but-cant-read-from-serial-port-ttys0-in-linux-c-program read() into a 10 char length buffer. Even though my other machine is still sending data, read() blocks forever. If I include the line fcntl(fd, F_SETFL, FNDELAY); which sets read() to non-blocking read() always returns with a value of -1, meaning no data was in the UART buffer, and my for loop code just prints out random values that are in the buffer. So in short my assumption is that my code is not reading ttyS0 and I have no idea why. Below is my code, hopefully someone will see what's causing my problem and set me straight. By the way, I'm using Scientific Linux, I believe ttyS0 is com port 1, as it is in RedHat and Fedora. Aslo below is the output when i run the code. It seems to be writing to the COM port with no problems, but for a read it says its unavailable. Also it's clear that the buffer I'm printing out is just random values not data that's been read in. Thanks console output hello world hi again write error: : Success wrote 4 bytes number of bytes read is -1 read error:: Resource temporarily unavailable 4 8 120 -99 -73 -65 41 -120 4
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