1From 2fa414c8655c421e7eb0bb1719928babb0ecf7c6 Mon Sep 17 00:00:00 2001
2From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
3Date: Thu, 26 Dec 2019 22:21:33 +0100
4Subject: [PATCH] src/client/linux/handler/exception_handler.cc: rename tgkill
5 to BreakpadTgkill()
6MIME-Version: 1.0
7Content-Type: text/plain; charset=UTF-8
8Content-Transfer-Encoding: 8bit
9
10Since glibc 2.30, a tgkill() function was added in the C library, and
11its definition obviously conflicts with the internal definition of
12google-breakpad, causing build failures:
13
14src/client/linux/handler/exception_handler.cc:109:12: error: ‘int tgkill(pid_t, pid_t, int)’ was declared ‘extern’ and later ‘static’ [-fpermissive]
15  109 | static int tgkill(pid_t tgid, pid_t tid, int sig) {
16      |            ^~~~~~
17In file included from /usr/include/signal.h:374,
18                 from ./src/client/linux/handler/exception_handler.h:33,
19                 from src/client/linux/handler/exception_handler.cc:66:
20/usr/include/bits/signal_ext.h:29:12: note: previous declaration of ‘int tgkill(__pid_t, __pid_t, int)’
21   29 | extern int tgkill (__pid_t __tgid, __pid_t __tid, int __signal);
22      |            ^~~~~~
23
24Upstream google-breakpad simply dropped the use of the internal
25tgkill() in commit
26https://chromium.googlesource.com/breakpad/breakpad/+/7e3c165000d44fa153a3270870ed500bc8bbb461. However,
27this is not realistic for Buildroot, since we do support old systems
28where the system C library will not necessarily provide tgkill().
29
30Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
31---
32 src/client/linux/handler/exception_handler.cc | 4 ++--
33 1 file changed, 2 insertions(+), 2 deletions(-)
34
35diff --git a/src/client/linux/handler/exception_handler.cc b/src/client/linux/handler/exception_handler.cc
36index b63f973b..b4c279b8 100644
37--- a/src/client/linux/handler/exception_handler.cc
38+++ b/src/client/linux/handler/exception_handler.cc
39@@ -106,7 +106,7 @@
40 #endif
41
42 // A wrapper for the tgkill syscall: send a signal to a specific thread.
43-static int tgkill(pid_t tgid, pid_t tid, int sig) {
44+static int BreakpadTgkill(pid_t tgid, pid_t tid, int sig) {
45   return syscall(__NR_tgkill, tgid, tid, sig);
46   return 0;
47 }
48@@ -387,7 +387,7 @@ void ExceptionHandler::SignalHandler(int sig, siginfo_t* info, void* uc) {
49     // In order to retrigger it, we have to queue a new signal by calling
50     // kill() ourselves.  The special case (si_pid == 0 && sig == SIGABRT) is
51     // due to the kernel sending a SIGABRT from a user request via SysRQ.
52-    if (tgkill(getpid(), syscall(__NR_gettid), sig) < 0) {
53+    if (BreakpadTgkill(getpid(), syscall(__NR_gettid), sig) < 0) {
54       // If we failed to kill ourselves (e.g. because a sandbox disallows us
55       // to do so), we instead resort to terminating our process. This will
56       // result in an incorrect exit code.
57--
582.24.1
59
60