Merge branch 'master' into nbd

ESP32/disk_backend_esp32.cpp

@@ -7,10 +7,9 @@
 
 
 disk_backend_esp32::disk_backend_esp32(const std::string & filename) :
+	filename(filename),
 	fh(new File32())
 {
-	if (!fh->open(filename.c_str(), O_RDWR))
-		error_exit(true, "rk05: cannot open \"%s\"", filename.c_str());
 }
 
 disk_backend_esp32::~disk_backend_esp32()
@@ -20,6 +19,17 @@ disk_backend_esp32::~disk_backend_esp32()
 	delete fh;
 }
 
+bool disk_backend_esp32::begin()
+{
+	if (!fh->open(filename.c_str(), O_RDWR)) {
+		DOLOG(ll_error, true, "rk05: cannot open \"%s\"", filename.c_str());
+
+		return false;
+	}
+
+	return true;
+}
+
 bool disk_backend_esp32::read(const off_t offset, const size_t n, uint8_t *const target)
 {
 	DOLOG(debug, false, "disk_backend_esp32::read: read %zu bytes from offset %zu", n, offset);

ESP32/disk_backend_esp32.h

@@ -7,12 +7,15 @@
 class disk_backend_esp32 : public disk_backend
 {
 private:
-	File32 *const fh { nullptr };
+	const std::string filename;
+	File32     *const fh { nullptr };
 
 public:
 	disk_backend_esp32(const std::string & filename);
 	virtual ~disk_backend_esp32();
 
+	bool begin();
+
 	bool read(const off_t offset, const size_t n, uint8_t *const target);
 
 	bool write(const off_t offset, const size_t n, const uint8_t *const from);

ESP32/main.ino

@@ -147,11 +147,22 @@ std::pair<std::vector<disk_backend *>, std::vector<disk_backend *> > select_disk
 		if (fh.open(selected_file.c_str(), O_RDWR)) {
 			fh.close();
 
+			disk_backend *temp = new disk_backend_esp32(selected_file);
+
+			if (!temp->begin()) {
+				c->put_string("Cannot use: ");
+				c->put_string_lf(selected_file.c_str());
+
+				delete temp;
+
+				continue;
+			}
+
 			if (ch == '1')
-				return { { new disk_backend_esp32(selected_file) }, { } };
+				return { { temp }, { } };
 
 			if (ch == '2')
-				return { { }, { new disk_backend_esp32(selected_file) } };
+				return { { }, { temp } };
 		}
 
 		c->put_string_lf("open failed");

disk_backend.h

@@ -10,6 +10,8 @@ public:
 	disk_backend();
 	virtual ~disk_backend();
 
+	virtual bool begin() = 0;
+
 	virtual bool read(const off_t offset, const size_t n, uint8_t *const target) = 0;
 
 	virtual bool write(const off_t offset, const size_t n, const uint8_t *const from) = 0;

disk_backend_file.cpp

@@ -1,4 +1,5 @@
 #include <fcntl.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "disk_backend_file.h"
@@ -6,7 +7,7 @@
 
 
 disk_backend_file::disk_backend_file(const std::string & filename) :
-	fd(open(filename.c_str(), O_RDWR))
+	filename(filename)
 {
 }
 
@@ -15,6 +16,19 @@ disk_backend_file::~disk_backend_file()
 	close(fd);
 }
 
+bool disk_backend_file::begin()
+{
+	fd = open(filename.c_str(), O_RDWR);
+
+	if (fd == -1) {
+		DOLOG(ll_error, true, "disk_backend_file: cannot open \"%s\": %s", filename.c_str(), strerror(errno));
+
+		return false;
+	}
+
+	return true;
+}
+
 bool disk_backend_file::read(const off_t offset, const size_t n, uint8_t *const target)
 {
 	DOLOG(debug, false, "disk_backend_file::read: read %zu bytes from offset %zu", n, offset);

disk_backend_file.h

@@ -6,12 +6,16 @@
 class disk_backend_file : public disk_backend
 {
 private:
-	const int fd { -1 };
+	const std::string filename;
+
+	int fd { -1 };
 
 public:
 	disk_backend_file(const std::string & filename);
 	virtual ~disk_backend_file();
 
+	bool begin();
+
 	bool read(const off_t offset, const size_t n, uint8_t *const target);
 
 	bool write(const off_t offset, const size_t n, const uint8_t *const from);

main.cpp

@@ -82,6 +82,8 @@ int main(int argc, char *argv[])
 
 	std::string  test;
 
+	disk_backend *temp_d = nullptr;
+
 	int  opt          = -1;
 	while((opt = getopt(argc, argv, "hm:T:r:R:p:ndtL:b:l:s:Q:")) != -1)
 	{
@@ -134,11 +136,17 @@ int main(int argc, char *argv[])
 				break;
 
 			case 'R':
-				rk05_files.push_back(new disk_backend_file(optarg));
+				temp_d = new disk_backend_file(optarg);
+				if (!temp_d->begin())
+					error_exit(false, "Cannot use file \"%s\" for RK05", optarg);
+				rk05_files.push_back(temp_d);
 				break;
 
 			case 'r':
-				rl02_files.push_back(new disk_backend_file(optarg));
+				temp_d = new disk_backend_file(optarg);
+				if (!temp_d->begin())
+					error_exit(false, "Cannot use file \"%s\" for RL02", optarg);
+				rl02_files.push_back(temp_d);
 				break;
 
 			case 'p':