Okay, I got that wrong. I seldom used select(), it is just an
additional layer on top of poll() which is much more efficient.
On 11/20/2020 11:13 AM, Daniel Pereira Carvalho wrote:
Hi Greg,
Thanks for the answer. I don't understand why I should use 1 instead of
fs + 1. The documentation says
"nfds This argument should be set to the highest-numbered file descriptor
in any of the three sets, plus 1. "
In the portserial.c nfds was set to fd + 1
Daniel Pereira de Carvalho
Em sex., 20 de nov. de 2020 às 14:04, Gregory Nutt <spudan...@gmail.com>
escreveu:
fd = open("/dev/ttyS1", O_RDWR | O_NOCTTY);
...
s_rc = select(fd + 1, &rset, NULL, NULL, &tv);
The first argument should be 1, not fd + 1
