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| author | Hui Zhu <teawater@gmail.com> | 2014-06-08 19:11:09 +0800 |
|---|---|---|
| committer | Hui Zhu <teawater@gmail.com> | 2014-06-08 19:14:06 +0800 |
| commit | c077881afaedb9b74063bee992b3e472b4b6e9ca (patch) | |
| tree | 4f9100c9e015f5f6683ffe42011e78e4102c3514 /gdb/common | |
| parent | ba2ffec39653bedebe1051d5d24954e9662781fa (diff) | |
| download | gdb-c077881afaedb9b74063bee992b3e472b4b6e9ca.zip gdb-c077881afaedb9b74063bee992b3e472b4b6e9ca.tar.gz gdb-c077881afaedb9b74063bee992b3e472b4b6e9ca.tar.bz2 | |
Fix gdb.base/watch-vfork.exp: Watchpoint triggers after vfork (sw) (timeout) with Linux 2.6.32 and older version
https://sourceware.org/ml/gdb-patches/2014-04/msg00047.html
Got gdb.base/watch-vfork.exp: Watchpoint triggers after vfork (sw)
(timeout) with Linux 2.6.32 and older version.
The rootcause is after the test use "set can-use-hw-watchpoints 0" let GDB
doesn't use hardware breakpoint and set a watchpoint on "global", GDB
continue will keep single step inside function "vfork".
The Linux 2.6.32 and older version doesn't have commit
6580807da14c423f0d0a708108e6df6ebc8bc83d (get more info please goto
http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=6580807da14c423f0d0a708108e6df6ebc8bc83d).
When the function "vfork" do syscall, the single step flag TIF_SINGLESTEP
will copy to child process.
Then GDB detach it, child process and parent process will be hanged.
So I make a patch that do a single step before detach. Then TIF_SINGLESTEP
of child process in old Linux kernel will be cleared before detach.
Child process in new Linux kernel will not be affected by this single step.
2014-06-08 Hui Zhu <hui@codesourcery.com>
* common/linux-ptrace.c (linux_disable_event_reporting): New
function.
* common/linux-ptrace.h (linux_disable_event_reporting): New
declaration.
* linux-nat.c (linux_child_follow_fork): Do a single step before
detach.
Diffstat (limited to 'gdb/common')
| -rw-r--r-- | gdb/common/linux-ptrace.c | 9 | ||||
| -rw-r--r-- | gdb/common/linux-ptrace.h | 1 |
2 files changed, 10 insertions, 0 deletions
diff --git a/gdb/common/linux-ptrace.c b/gdb/common/linux-ptrace.c index efbd1ea..b140b08 100644 --- a/gdb/common/linux-ptrace.c +++ b/gdb/common/linux-ptrace.c @@ -476,6 +476,15 @@ linux_enable_event_reporting (pid_t pid) (PTRACE_TYPE_ARG4) (uintptr_t) current_ptrace_options); } +/* Disable reporting of all currently supported ptrace events. */ + +void +linux_disable_event_reporting (pid_t pid) +{ + /* Set the options. */ + ptrace (PTRACE_SETOPTIONS, pid, (PTRACE_TYPE_ARG3) 0, 0); +} + /* Returns non-zero if PTRACE_OPTIONS is contained within CURRENT_PTRACE_OPTIONS, therefore supported. Returns 0 otherwise. */ diff --git a/gdb/common/linux-ptrace.h b/gdb/common/linux-ptrace.h index 881d9c9..cffb5ce 100644 --- a/gdb/common/linux-ptrace.h +++ b/gdb/common/linux-ptrace.h @@ -86,6 +86,7 @@ struct buffer; extern void linux_ptrace_attach_fail_reason (pid_t pid, struct buffer *buffer); extern void linux_ptrace_init_warnings (void); extern void linux_enable_event_reporting (pid_t pid); +extern void linux_disable_event_reporting (pid_t pid); extern int linux_supports_tracefork (void); extern int linux_supports_traceclone (void); extern int linux_supports_tracevforkdone (void); |