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* [binutils-gdb] Fix remote serial read
@ 2024-01-19 18:10 Tom Tromey
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From: Tom Tromey @ 2024-01-19 18:10 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=74d8fa2df7e7844f9b1b8fac27fe7d0b82100ab0
commit 74d8fa2df7e7844f9b1b8fac27fe7d0b82100ab0
Author: Сергей Чернов <klen_s@mail.ru>
Date: Fri Jan 19 11:01:18 2024 -0700
Fix remote serial read
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
Diff:
---
gdb/ser-unix.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gdb/ser-unix.c b/gdb/ser-unix.c
index f917aa85e3d..bc8b087b6eb 100644
--- a/gdb/ser-unix.c
+++ b/gdb/ser-unix.c
@@ -574,7 +574,7 @@ when debugging using remote targets."),
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;
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2024-01-19 18:10 [binutils-gdb] Fix remote serial read Tom Tromey
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