From c9c2763dd4302cf013d0a7238881001d214a8b03 Mon Sep 17 00:00:00 2001
From: Shuduo Sang <sangshuduo@gmail.com>
Date: Fri, 8 Jan 2021 17:24:43 +0800
Subject: [PATCH] [TD-2705] fix: provide cmdline info when a shutdown signal
 received.

---
 src/dnode/src/dnodeSystem.c |  2 +-
 src/os/inc/osSysinfo.h      |  1 +
 src/os/src/linux/linuxEnv.c | 20 +++++++++++++++++++-
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/dnode/src/dnodeSystem.c b/src/dnode/src/dnodeSystem.c
index 36232893b5..a4d7e791e6 100644
--- a/src/dnode/src/dnodeSystem.c
+++ b/src/dnode/src/dnodeSystem.c
@@ -160,7 +160,7 @@ static void signal_handler(int32_t signum, siginfo_t *sigInfo, void *context) {
   syslog(LOG_INFO, "Shut down signal is %d", signum);
   syslog(LOG_INFO, "Shutting down TDengine service...");
   // clean the system.
-  dInfo("shut down signal is %d, sender PID:%d", signum, sigInfo->si_pid);
+  dInfo("shut down signal is %d, sender PID:%d cmdline:%s", signum, sigInfo->si_pid, taosGetCmdlineByPID(sigInfo->si_pid));
 
   // protect the application from receive another signal
   struct sigaction act = {{0}};
diff --git a/src/os/inc/osSysinfo.h b/src/os/inc/osSysinfo.h
index 2b98f8b4bf..b592a6c679 100644
--- a/src/os/inc/osSysinfo.h
+++ b/src/os/inc/osSysinfo.h
@@ -32,6 +32,7 @@ void taosPrintOsInfo();
 int  taosSystem(const char * cmd) ;
 void taosKillSystem();
 bool taosGetSystemUid(char *uid);
+char *taosGetCmdlineByPID(int pid);
 
 // TAOS_OS_FUNC_SYSINFO_CORE
 void taosSetCoreDump();
diff --git a/src/os/src/linux/linuxEnv.c b/src/os/src/linux/linuxEnv.c
index 14b40a1f18..5772885cb4 100644
--- a/src/os/src/linux/linuxEnv.c
+++ b/src/os/src/linux/linuxEnv.c
@@ -39,4 +39,22 @@ void osInit() {
   strcpy(tsDnodeDir, "");
   strcpy(tsMnodeDir, "");
   strcpy(tsOsName, "Linux");
-}
\ No newline at end of file
+}
+
+char cmdline[1024];
+
+char *taosGetCmdlineByPID(int pid)
+{
+  sprintf(cmdline, "/proc/%d/cmdline",pid);
+  FILE* f = fopen(cmdline,"r");
+  if(f){
+    size_t size;
+    size = fread(cmdline, sizeof(char), 1024, f);
+    if(size>0){
+      if('\n'==cmdline[size-1])
+        cmdline[size-1]='\0';
+    }
+    fclose(f);
+  }
+  return cmdline;
+}
-- 
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