Linux Programming

RPI_BT_SERVER _X86 
date version Feb 28 2020
test time 10:17:50
 BRAEK @line 333
STATUS allocate socket : Success
STATUS close socket : Invalid argument
STATUS reallocate socket : Invalid argument this is the issue 
STATUS bind : Address already in use
STATUS listen : File descriptor in bad state
STATUS accept : File descriptor in bad state
accepted connection from 00:00:00:00:00:00

<pre>	struct sockaddr_rc loc_addr = { 0 }, rem_addr = { 0 };
	char buf[1024] = { 0 };
	int socket_fd, client_fd, bytes_read;
	socklen_t opt = sizeof(rem_addr);

	// allocate socket
	socket_fd= socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
	perror("STATUS allocate socket ");

	// close socket
	close(socket_fd);
	perror("STATUS close socket ");
	// re allocate socket
	socket_fd = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
	perror("STATUS reallocate socket ");

	// bind socket to port 1 of the first available
	// local bluetooth adapter
	loc_addr.rc_family = AF_BLUETOOTH;

	struct hci_dev_info device_info;
	hci_devinfo(0, &device_info);

//  exit(1);

	loc_addr.rc_bdaddr = device_info.bdaddr; //   {"00:15:83:15:A2:CB"}; // "*BDADDR_ANY;
	loc_addr.rc_channel = (uint8_t) 1;
	bind(socket_fd, (struct sockaddr*) &loc_addr, sizeof(loc_addr));
	perror("STATUS bind ");
	// put socket into listening mode
	listen(socket_fd, 1);
	perror("STATUS listen ");
	// accept one connection
	client_fd = accept(socket_fd, (struct sockaddr*) &rem_addr, &opt);
	perror("STATUS accept ");
	ba2str(&rem_addr.rc_bdaddr, buf);
	fprintf(stderr, "accepted connection from %s\n", buf);
	memset(buf, 0, sizeof(buf));

	// read data from the client
	bytes_read = read(client_fd, buf, sizeof(buf));
	if (bytes_read > 0) {
		printf("received [%s]\n", buf);
	}

	// close connection
	close(client_fd);
	close(socket_fd);

$ make
mkdir -p build/./main/
The syntax of the command is incorrect.
make: *** [build/./main/hello_world_main.c.o] Error 1

TARGET_EXEC ?= Hello_world_c

BUILD_DIR ?= ./build
SRC_DIRS ?= ./main

SYSROOT = $(RPIDEV_LOC)/arm-linux-gnueabihf/sysroot
CROSS_COMPILE = $(RPIDEV_LOC)/bin/arm-linux-gnueabihf

CXX = $(CROSS_COMPILE)-g++ --sysroot $(SYSROOT)
CC = $(CROSS_COMPILE)-gcc --sysroot $(SYSROOT) -lpigpio
AS = $(CROSS_COMPILE)-as
AR = $(CROSS_COMPILE)-ar
NM = $(CROSS_COMPILE)-nm
LD = $(CROSS_COMPILE)-ld

SRCS := $(shell find $(SRC_DIRS) -name *.cpp -or -name *.c -or -name *.s)
OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
DEPS := $(OBJS:.o=.d)

INC_DIRS := $(shell find $(SRC_DIRS) -type d)
INC_FLAGS := $(addprefix -I,$(INC_DIRS))

CPPFLAGS ?= $(INC_FLAGS) -MMD -MP -g

$(BUILD_DIR)/$(TARGET_EXEC): $(OBJS)
	$(CC) $(OBJS) -o $@ $(LDFLAGS)

# assembly
$(BUILD_DIR)/%.s.o: %.s
	$(MKDIR_P) $(dir $@) 
	$(AS) $(ASFLAGS) -c $< -o $@

# c source
$(BUILD_DIR)/%.c.o: %.c
	$(MKDIR_P) $(dir $@)
	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@

# c++ source
$(BUILD_DIR)/%.cpp.o: %.cpp
	$(MKDIR_P) $(dir $@)
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@


.PHONY: clean

clean:
	$(RM) -r $(BUILD_DIR)

-include $(DEPS)

MKDIR_P ?= mkdir -p