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AP_UAVCAN: limit number of file open and close events

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This commit is contained in:
Siddharth Purohit 2018-11-27 11:28:24 +08:00 committed by Andrew Tridgell
parent 0976019133
commit 6a27e8585a
1 changed files with 15 additions and 0 deletions
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15
libraries/AP_UAVCAN/AP_UAVCAN_Servers.cpp
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@ -92,6 +92,7 @@ class AP_UAVCAN_FileStorageBackend : public uavcan::dynamic_node_id_server::ISto
enum { FilePermissions = 438 }; ///< 0o666
enum { MaxNumOpens = 100 };
/**
* This type is used for the path
*/
@ -99,6 +100,7 @@ class AP_UAVCAN_FileStorageBackend : public uavcan::dynamic_node_id_server::ISto
PathString base_path;
static uint8_t num_opens;
protected:
virtual String get(const String& key) const
{
@ -106,6 +108,12 @@ protected:
PathString path = base_path.c_str();
path += key;
String value;
//This is to deter frequent inflight opening and closing of files during an event
//where the device is misbehaving
if (num_opens >= MaxNumOpens) {
return value;
}
num_opens++;
int fd = open(path.c_str(), O_RDONLY);
if (fd >= 0)
{
@ -146,6 +154,12 @@ protected:
using namespace std;
PathString path = base_path.c_str();
path += key;
//This is to deter frequent inflight opening and closing of files during an event
//where the device is misbehaving
if (num_opens >= MaxNumOpens) {
return;
}
num_opens++;
#if HAL_OS_POSIX_IO
int fd = open(path.c_str(), O_WRONLY | O_CREAT | O_TRUNC, FilePermissions);
#else
@ -215,6 +229,7 @@ public:
}
};
uint8_t AP_UAVCAN_FileStorageBackend::num_opens = 0;
bool AP_UAVCAN_Servers::init(uavcan::Node<0> &node)
{