[ECOS] how to use flag O_NDELAY and O_NONBLOCK in eCos serial port programming

[Edgar Grimberg]

Indra Antonius Simalango wrote:

>dear all,
>
>Below are my quote snippet. It would open a serial fax device as a file.  
>It returns the file descriptor on success or -1 on error.
>-------------------------------------------------------------------------
>
>#include <stdio.h>   
>#include <string.h> 
>#include <unistd.h> 
>#include <fcntl.h>   
>#include <errno.h>  
>#include <termios.h>
>
>int main(void)
>{
>	int fd;
>	fd = open("/dev/ser1", O_RDWR | O_NOCTTY | O_NDELAY);
>    if (fd == -1) {
>	perror("open_port: Unable to open /dev/ser1 - ");
>    }
>    else fcntl(fd, F_SETFL, 0);
>	return (fd);
>}
>------------------------------------------------------------------------
>
>I've got an error message while compiling and linking it :
>
>   testserial.c:11: 'O_NDELAY' undeclared (first use in this function)
>   testserial.c:11: (Each undeclared identifier is reported only once
>   testserial.c:11: for each function it appears in.)
>
>I've read some "Posix Serial Communication", and then try to replace 
>O_NDELAY by O_NONBLOCK. There's no error message after compile and link. 
>But when executing on my target pci386, it got an error message :
>
>   open_port : Unable to open /dev/ser1 - Invalid argument
>
>Is flag O_NONBLOCK really an invalid argument to open a serial port on 
>eCos? Or maybe there's another way to do this.
>
>Thank you.
>  
>
Hi,

Try reading this:

http://ecos.sourceware.org/docs-latest/ref/io-user-api.html

and press next a couple of times.

Edgar


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