修复：防止 ATSC 应用重复启动

src/daemon_cttb/src/daemon_system.c

@@ -5,68 +5,107 @@
 
 ***************************************/
 #include "common.h"
+#include <dirent.h>
+#include <limits.h>
 
 
 
-//程序名字
-#define PROGRAM_NAME         "imx_atsc_app"
 #define NODE_NAME            "http"
 
-//查找进程中程序名字
-#define PROGRAM_NAME_FIND         "imx_atsc_app"
 #define PROGRAM_NODE_NAME_FIND    "http"
 
 //输出目录
-#define PROGRAM_DIR_OUT_FILE        "/tmp/atsc_app_status"
 #define NODE_PROGRAM_DIR_OUT_FILE   "/tmp/web_p_status"
 
 //要运行的程序
-//#define RUN_NAME_PROGRAM          "/aw/anywave/app/imx_atsc_app 1 &"
-#define RUN_NAME_PROGRAM          "/aw/anywave/app/imx_atsc_app 1 2>&1 | loglog /var/module_log/ imx_atsc_app.log 1 &"
+#define PROGRAM_EXE_PATH          "/aw/anywave/app/imx_atsc_app"
+#define RUN_NAME_PROGRAM          PROGRAM_EXE_PATH " 2>&1 | /usr/sbin/loglog /var/module_log/ imx_atsc_app.log 1 &"
 #define RUN_NODE_NAME_PROGRAM     "cd /aw/anywave/web/sh && ./start_web.sh &"
 
+/* The application renames its main task with pthread_setname_np(), therefore
+ * BusyBox `ps | grep imx_atsc_app` can report it as missing and the daemon may
+ * start a second instance.  /proc/<pid>/exe remains stable across task renames
+ * and also lets us match the exact executable instead of a substring. */
+static int is_app_running(void)
+{
+    DIR *proc_dir;
+    struct dirent *entry;
+    char exe_link[64];
+    char exe_path[PATH_MAX];
+    ssize_t exe_len;
+    size_t expected_len = strlen(PROGRAM_EXE_PATH);
 
-int main(int argc,char *argv[])
+    proc_dir = opendir("/proc");
+    if(proc_dir == NULL)
+    {
+        /* Fail safe: an unreadable /proc must not cause duplicate app starts. */
+        return -1;
+    }
+
+    while((entry = readdir(proc_dir)) != NULL)
+    {
+        const char *p = entry->d_name;
+
+        if(*p == '\0')
+        {
+            continue;
+        }
+        while(*p >= '0' && *p <= '9')
+        {
+            p++;
+        }
+        if(*p != '\0')
+        {
+            continue;
+        }
+
+        snprintf(exe_link, sizeof(exe_link), "/proc/%s/exe", entry->d_name);
+        exe_len = readlink(exe_link, exe_path, sizeof(exe_path) - 1);
+        if(exe_len < 0)
+        {
+            continue;
+        }
+        exe_path[exe_len] = '\0';
+
+        if(strcmp(exe_path, PROGRAM_EXE_PATH) == 0 ||
+           (strncmp(exe_path, PROGRAM_EXE_PATH, expected_len) == 0 &&
+            strcmp(exe_path + expected_len, " (deleted)") == 0))
+        {
+            closedir(proc_dir);
+            return 1;
+        }
+    }
+
+    closedir(proc_dir);
+    return 0;
+}
+
+
+int main(void)
 {
     int fd = 0;
-    int ret = 0;
     int remux_ok = 0;
     int node_ok = 0;
 
     char buf[100];
-    char cmd[100] = {0};
+    char cmd[256] = {0};
 
     //开启守护进程
     daemon(0,0);
 
     while (1)
     {
-        //新建输出文件
-        memset(cmd, 0 ,sizeof(cmd));
-        sprintf(cmd, "echo 0 > %s", PROGRAM_DIR_OUT_FILE);
-        ret = os_system(cmd);
-
-        //获得程序ID
-        memset(cmd, 0 ,sizeof(cmd));
-        sprintf(cmd, "ps | grep %s | grep -v grep >> %s", PROGRAM_NAME_FIND, PROGRAM_DIR_OUT_FILE);
-        ret = os_system(cmd);
-
-        //打开输出文件
-        fd = open(PROGRAM_DIR_OUT_FILE, O_CREAT|O_RDONLY, 0777);
-        memset(buf, 0, 100);
-        read(fd, buf, 100);
-        close(fd);
-        remux_ok = match(buf, PROGRAM_NAME, 90);
+        remux_ok = is_app_running();
 
         // web
         memset(cmd, 0 ,sizeof(cmd));
         sprintf(cmd, "echo 0 > %s", NODE_PROGRAM_DIR_OUT_FILE);
-        ret = os_system(cmd);
+        (void)os_system(cmd);
 
         //获得程序ID
         memset(cmd, 0 ,sizeof(cmd));
         sprintf(cmd, "ps | grep %s | grep -v grep >> %s", PROGRAM_NODE_NAME_FIND, NODE_PROGRAM_DIR_OUT_FILE);
-        ret = os_system(cmd);
+        (void)os_system(cmd);
 
         //打开输出文件
         fd = open(NODE_PROGRAM_DIR_OUT_FILE, O_CREAT|O_RDONLY, 0777);
@@ -80,14 +119,17 @@ int main(int argc,char *argv[])
         //判断是否有程序文件运行
         if(1 != remux_ok)
         {
-            //运行程序
+            /* Debounce once before starting.  This prevents a duplicate launch
+             * when the app is between exec/startup states during an upgrade. */
             usleep(1000000);
-
-            memset(cmd, 0 ,sizeof(cmd));
-            sprintf(cmd, "%s", RUN_NAME_PROGRAM);
-            printf("imx_atsc_app stop , daemon work.\n%s\n\n", cmd);
-            system(cmd);
-            usleep(100000);
+            if(!is_app_running())
+            {
+                memset(cmd, 0 ,sizeof(cmd));
+                snprintf(cmd, sizeof(cmd), "%s", RUN_NAME_PROGRAM);
+                printf("imx_atsc_app stop, daemon restart without legacy argument.\n%s\n\n", cmd);
+                system(cmd);
+                usleep(100000);
+            }
          }
          if(1 != node_ok)
          {
@@ -102,13 +144,9 @@ int main(int argc,char *argv[])
 
 
         //删除输出文件
-        memset(cmd, 0 ,sizeof(cmd));
-        sprintf(cmd, "rm %s", PROGRAM_DIR_OUT_FILE);
-        ret = os_system(cmd);
-
         memset(cmd, 0 ,sizeof(cmd));
         sprintf(cmd, "rm %s", NODE_PROGRAM_DIR_OUT_FILE);
-        ret = os_system(cmd);
+        (void)os_system(cmd);
 
     }