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With the read system call, there is NO guarantee that it will not return with less data when it is available. This depends on the device and internal buffer sizes, etc. You should never write code that assumes you will get all of the bytes you ask for, even if you are sure they have been sent. It is your job to write a loop to handle this.
Here is some example code, but you also need to check for a return value of -1 and handle that. Hope this helps I also have some code for setting the baud rate and timeout if you need it.. Don. int rt_read_serial(int fd, void *data, int sz) { int total_read = 0; char *dp = (char *) data; while (total_read < sz) { int n = read(fd, dp + total_read, sz - total_read); if (n == 0) { // we timed out waiting for our characters. return total_read; } total_read += n; } return total_read; } On 12/19/06,
kendwyer <> wrote:
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