serial port read failure
John E. A.
Mon Dec 30 15:04:00 GMT 2002
I've been compiling a simple application in both linux and cygwin. I hacked it
from a GNU readline library application example: fileman.c
I added serial port device access (/dev/ttyS0) to this program via both stream
i/o (fopen, putc, etc) and low level i/o (open, read, etc) both versions work
when compiled under linux, neither work when compiled under cygwin.
I've stepped through my code using gdb --nw and find that the failures usually
occur in the fgetc and read functions.
Sometimes I can single-step through these functions with success, but they never
run successfully, at full speed, in cygwin.
I have a new full net install of cygwin: 1.3.17 including source, running on
Can someone please provide some simple working example of serial port device access?
Additionally I am not able to step into the newlib source. Any tips on getting
gdb to step into the library function source would also be greatly appreciated.
For example, If I'm on a source line of:
143 data = fgetc(port);
and enter a gdb command of:
my last printf data is flushed from the output buffer (it didn't end in \n) and
then it just hangs. When I C-c I get:
Program received signal SIGINT, Interrupt.
[Switching to thread 900.0x3f4]
0x77ec7fb0 in _libkernel32_a_iname ()
and I'm back at the gdb prompt.
Thank You for your reply...
John E. A.
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