Re: Getting 'bad file number' error writing to device driver

Hello,

I am trying to write to mydriver but get a 'Bad file number' error.

int fd = open("/dev/mydriver",O_RDWR);

this opens successfully as fd is not -1.

ssize_t bytesToWrite = strlen(buf);

value is: bytesToWrite 28

ssize_t bytesWritten = write(fd,buf,bytesToWrite);

value is: bytesWritten -1

__android_log_print(ANDROID_LOG_INFO,__FILE__,"ANIL strerror(errno) %s",  strerror(errno));

value is: strerror(errno) Bad file number

Please use strace and let us know the full trace of system calls. Also, if possible could you paste the 'write' function of your driver? thanks, Daniel.