After closing "Bug 30770 - serial.c does not preserve errno correctly"
https://sourceware.org/bugzilla/show_bug.cgi?id=30770
remote debugging became impossible due to an attempt to recv() by a call intended for the socket, and not for the character device file. The
documentation implicitly states that it is possible to use the read() call to work with a socket. But this does not mean in the general case that it is
permissible to use recv in the case of a non-socket.
condition:
os: Distributor ID: Ubuntu
Description: Ubuntu 23.10
Release: 23.10
Codename: mantic
libc:
ldd (Ubuntu GLIBC 2.38-1ubuntu6) 2.38
kernel:
Linux klen-dev-um790pro 6.5.0-14-generic #14-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 14 14:59:49 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
gdb: build from trank at 15.0.50.
20231226-git
GDB output:
$ arm-kgp-eabi-gdb
GNU gdb (Klen's_GNU_package_(KGP)_for_target::arm-kgp-eabi<rmprofile/lto>_host::x86_64-kgp-linux-gnu_znver4-avx512<<ílex>>)
15.0.50.
20231226-git
....
(gdb) tar ext /dev/ttyACM1
Remote debugging using /dev/ttyACM1
Remote communication error. Target disconnected: error while reading: Socket operation on non-socket.
(gdb)
after fix gdb work fine
$ arm-kgp-eabi-gdb -q
(gdb) tar ext /dev/ttyACM0
Remote debugging using /dev/ttyACM0
(gdb) mon swd
Target voltage: 0.0V
Available Targets:
No. Att Driver
STM32F40x M4
(gdb) att 1
Attaching to Remote target
warning: No executable has been specified and target does not support
determining executable automatically. Try using the "file" command.
0x08020c80 in ?? ()
(gdb)
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30770
int
ser_unix_read_prim (struct serial *scb, size_t count)
{
- int result = recv (scb->fd, scb->buf, count, 0);
+ int result = read (scb->fd, scb->buf, count);
if (result == -1 && errno != EINTR)
perror_with_name ("error while reading");
return result;