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* common/linux-procfs.c (linux_proc_get_int): New, from
	linux_proc_get_tgid, change its LWPID type to pid_t, add parameter
	field.
	(linux_proc_get_tgid): Only call linux_proc_get_int.
	(linux_proc_get_tracerpid): New.
	(linux_proc_pid_has_state): New, from linux_proc_pid_is_zombie.
	(linux_proc_pid_is_stopped, linux_proc_pid_is_zombie): Only call
	linux_proc_pid_has_state.
	* common/linux-procfs.h (linux_proc_get_tracerpid): New declaration.
	* common/linux-ptrace.c: Include linux-procfs.h and buffer.h.
	(linux_ptrace_attach_warnings): New.
	* common/linux-ptrace.h (struct buffer, linux_ptrace_attach_warnings):
	New declaration.
	* linux-nat.c: Include exceptions.h, linux-ptrace.h and buffer.h.
	(linux_nat_attach): New variables ex, buffer, message and message_s.
	Wrap to_attach by TRY_CATCH and call linux_ptrace_attach_warnings.

gdb/gdbserver/
	* linux-low.c (linux_attach_lwp_1): New variable buffer.  Call
	linux_ptrace_attach_warnings.

gdb/testsuite/
	* gdb.base/attach-twice.c: New files.
	* gdb.base/attach-twice.exp: New files.
This commit is contained in:
Jan Kratochvil
2012-03-13 15:02:25 +00:00
parent 5f572decf9
commit 87b0bb13cb
11 changed files with 240 additions and 52 deletions
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27
gdb/linux-nat.c
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@@ -62,6 +62,9 @@
#include "symfile.h"
#include "agent.h"
#include "tracepoint.h"
#include "exceptions.h"
#include "linux-ptrace.h"
#include "buffer.h"
#ifndef SPUFS_MAGIC
#define SPUFS_MAGIC 0x23c9b64e
@@ -1612,11 +1615,33 @@ linux_nat_attach (struct target_ops *ops, char *args, int from_tty)
struct lwp_info *lp;
int status;
ptid_t ptid;
volatile struct gdb_exception ex;
/* Make sure we report all signals during attach. */
linux_nat_pass_signals (0, NULL);
linux_ops->to_attach (ops, args, from_tty);
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
linux_ops->to_attach (ops, args, from_tty);
}
if (ex.reason < 0)
{
pid_t pid = parse_pid_to_attach (args);
struct buffer buffer;
char *message, *buffer_s;
message = xstrdup (ex.message);
make_cleanup (xfree, message);
buffer_init (&buffer);
linux_ptrace_attach_warnings (pid, &buffer);
buffer_grow_str0 (&buffer, "");
buffer_s = buffer_finish (&buffer);
make_cleanup (xfree, buffer_s);
throw_error (ex.error, "%s%s", buffer_s, message);
}
/* The ptrace base target adds the main thread with (pid,0,0)
format. Decorate it with lwp info. */