From 1927e618630942385e8e5dcc14780711fcd09a07 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 9 Apr 2013 12:18:34 +0000 Subject: [PATCH] Avoid potencially-stale errno usage. The current throw_perror_with_name/TARGET_CLOSE_ERROR calls assume errno is still set to the right error, although remote_unpush_target is called in between, which may well change errno. Tested on x86_64 Fedora 17 w/ gdbserver. gdb/ 2013-04-09 Pedro Alves * remote.c (unpush_and_perror): New function. (readchar, remote_serial_write): Use it. --- gdb/ChangeLog | 5 +++++ gdb/remote.c | 29 +++++++++++++++++++++-------- 2 files changed, 26 insertions(+), 8 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index f18ab96911..21aebc323f 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2013-04-09 Pedro Alves + + * remote.c (unpush_and_perror): New function. + (readchar, remote_serial_write): Use it. + 2013-04-09 Markus Metzger * NEWS: Mention new btrace RSP packets. diff --git a/gdb/remote.c b/gdb/remote.c index 740324b546..de075c88e3 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -7033,6 +7033,23 @@ remote_files_info (struct target_ops *ignore) /* Stuff for dealing with the packets which are part of this protocol. See comment at top of file for details. */ +/* Close/unpush the remote target, and throw a TARGET_CLOSE_ERROR + error to higher layers. Called when a serial error is detected. + The exception message is STRING, followed by a colon and a blank, + then the system error message for errno at function entry. */ + +static void +unpush_and_perror (const char *string) +{ + char *errstr; + + errstr = xstrprintf ("%s: %s", string, safe_strerror (errno)); + make_cleanup (xfree, errstr); + + remote_unpush_target (); + throw_error (TARGET_CLOSE_ERROR, "%s", errstr); +} + /* Read a single character from the remote end. */ static int @@ -7052,10 +7069,8 @@ readchar (int timeout) throw_error (TARGET_CLOSE_ERROR, _("Remote connection closed")); /* no return */ case SERIAL_ERROR: - remote_unpush_target (); - throw_perror_with_name (TARGET_CLOSE_ERROR, - _("Remote communication error. " - "Target disconnected.")); + unpush_and_perror (_("Remote communication error. " + "Target disconnected.")); /* no return */ case SERIAL_TIMEOUT: break; @@ -7071,10 +7086,8 @@ remote_serial_write (const char *str, int len) { if (serial_write (remote_desc, str, len)) { - remote_unpush_target (); - throw_perror_with_name (TARGET_CLOSE_ERROR, - _("Remote communication error. " - "Target disconnected.")); + unpush_and_perror (_("Remote communication error. " + "Target disconnected.")); } } -- 2.34.1