消费者进程启动时，检查是否存在已启动的消费者进程，避免重复启动

shm_consumer/MESA_shm_consumer.c

@@ -10,6 +10,7 @@
 
 #include "MESA_shm_ring_queue.h"
 
+#define BUFSIZE    256
 void init_ring_queue_head_arrray(struct MESA_shm_overview *ovw, struct MESA_shm_queue_head **ring_queue_head)
 {
 	int i = 0;
@@ -57,8 +58,50 @@ void consumer_daemo()
     }
 	return ;
 }
-int main(int argc, char **args)
+int consumer_is_running(char *process_name)
 {
+	FILE *fp = NULL;
+	char buf[BUFSIZE] = {0};
+	int count = 0;
+	char command[BUFSIZE] = {0};
+	if(process_name == NULL){
+		return 0;
+	}
+	snprintf(command, sizeof(command), "ps -ef | grep %s | grep -v grep | wc -l", process_name);
+	fp = popen(command, "r");
+	if(fp == NULL){
+		return 0;
+	}
+	if((fgets(buf, sizeof(buf), fp)) != NULL){
+		count = atoi(buf);
+	}
+	pclose(fp);
+	if(count > 1){
+		return 1;
+	}else{
+		return 0;
+	}
+	return 0;
+}
+char *get_exe_name(char *argv)
+{
+	char * p = NULL;
+	p = rindex(argv, '/');
+	if(p == NULL){
+		p = argv;
+	}else{
+		p = p + 1;
+	}
+	return p;
+}
+int main(int argc, char **argv)
+{
+
+	char *exe_name = get_exe_name(argv[0]);
+	if(consumer_is_running(exe_name)){
+		printf("consumer process is already running\n");
+		return 0;
+	}
 	consumer_daemo();
 	int i = 0;
 	struct MESA_shm_overview *shm_overview = NULL;