modern pipe

main.c

@@ -59,6 +59,10 @@
 #include <signal.h>
 #include <unistd.h>
 #include <string.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <poll.h>
 #endif
 
 #include <stdio.h>
@@ -169,6 +173,9 @@ typedef struct main_state_typedef{
   uint32_t run_I;      // № current run
   uint32_t runs_N;     // total number of runs
   char data_path[200]; // base directory for data files
+  char pipe_path[200]; // path to named pipe (FIFO) for streaming data
+  int pipe_fd;         // file descriptor for the pipe
+  int save_to_files;   // flag: save data to files (0=false, 1=true)
 } main_state;
 
 static void main_state_set_defaults(main_state* st) {
@@ -180,6 +187,10 @@ static void main_state_set_defaults(main_state* st) {
   st->runs_N = 1;
   strncpy(st->data_path, "data", sizeof(st->data_path));
   st->data_path[sizeof(st->data_path)-1] = '\0';
+  strncpy(st->pipe_path, "/tmp/radar_data_pipe", sizeof(st->pipe_path));
+  st->pipe_path[sizeof(st->pipe_path)-1] = '\0';
+  st->pipe_fd = -1;
+  st->save_to_files = 0; // default: false
 }
 
 static char* f_trim(char* s) {
@@ -254,6 +265,15 @@ static void parse_cmd_file(const char* filename, main_state* st) {
     } else if (strcmp(field, "data_path") == 0) {
       strncpy(st->data_path, value, sizeof(st->data_path));
       st->data_path[sizeof(st->data_path)-1] = '\0';
+    } else if (strcmp(field, "pipe_path") == 0) {
+      strncpy(st->pipe_path, value, sizeof(st->pipe_path));
+      st->pipe_path[sizeof(st->pipe_path)-1] = '\0';
+    } else if (strcmp(field, "save_to_files") == 0) {
+      if (strcmp(value, "true") == 0 || strcmp(value, "1") == 0) {
+        st->save_to_files = 1;
+      } else if (strcmp(value, "false") == 0 || strcmp(value, "0") == 0) {
+        st->save_to_files = 0;
+      }
     }
   }
   fclose(f);
@@ -367,6 +387,7 @@ static t_x502_hnd f_dev_select_open(int argc, char** argv) {
     fnd_devcnt = f_get_all_devrec(&devrec_list, ip_dev_list, ip_cnt);
 
     if (fnd_devcnt == 0) {
+        
         printf("Не найдено ни одного модуля\n");
     } else {
         // выводим информацию по списку модулей //
@@ -694,9 +715,159 @@ void insert_marker_to_file(char* logfilename, char* marker_text){
 	fclose(logfile_ptr);
 }
 
+#ifndef _WIN32
+// Function to check if pipe reader is present and ready
+// Returns: 1 if ready to write, 0 if should wait, -1 on error
+int check_pipe_ready(int pipe_fd) {
+	if (pipe_fd < 0) {
+		return -1;
+	}
 
+	struct pollfd pfd;
+	pfd.fd = pipe_fd;
+	pfd.events = POLLOUT;
+	pfd.revents = 0;
 
-void receive_to_file(t_x502_hnd hnd, char* logfilename, uint32_t* inp_buff, uint32_t max_total_words, uint32_t timeout){
+	// Check with 0 timeout (non-blocking check)
+	int ret = poll(&pfd, 1, 0);
+
+	if (ret < 0) {
+		fprintf(stderr, "Error polling pipe: %s\n", strerror(errno));
+		return -1;
+	}
+
+	if (ret == 0) {
+		// Timeout - pipe buffer is full, reader is slow or absent
+		return 0;
+	}
+
+	// Check for errors
+	if (pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
+		if (pfd.revents & POLLERR) {
+			fprintf(stderr, "Pipe error detected\n");
+		}
+		if (pfd.revents & POLLHUP) {
+			fprintf(stderr, "Pipe hangup - reader disconnected\n");
+		}
+		if (pfd.revents & POLLNVAL) {
+			fprintf(stderr, "Invalid pipe fd\n");
+		}
+		return -1;
+	}
+
+	// POLLOUT is set - ready to write
+	if (pfd.revents & POLLOUT) {
+		return 1;
+	}
+
+	return 0;
+}
+
+// Function to wait for pipe to become ready
+// Returns: 1 if ready, 0 if interrupted, -1 on error
+int wait_for_pipe_reader(int pipe_fd) {
+	if (pipe_fd < 0) {
+		return -1;
+	}
+
+	printf("Waiting for pipe reader to become ready...\n");
+
+	struct pollfd pfd;
+	pfd.fd = pipe_fd;
+	pfd.events = POLLOUT;
+
+	while (1) {
+		pfd.revents = 0;
+
+		// Wait with 1 second timeout
+		int ret = poll(&pfd, 1, 1000);
+
+		if (ret < 0) {
+			if (errno == EINTR) {
+				// Interrupted by signal, continue
+				continue;
+			}
+			fprintf(stderr, "Error waiting for pipe: %s\n", strerror(errno));
+			return -1;
+		}
+
+		if (ret == 0) {
+			// Timeout - print status and continue waiting
+			printf("Still waiting for pipe reader...\n");
+			continue;
+		}
+
+		// Check for errors
+		if (pfd.revents & (POLLERR | POLLHUP | POLLNVAL)) {
+			fprintf(stderr, "Pipe error while waiting\n");
+			return -1;
+		}
+
+		// Ready to write
+		if (pfd.revents & POLLOUT) {
+			printf("Pipe reader is ready!\n");
+			return 1;
+		}
+	}
+}
+
+// Function to initialize named pipe (FIFO)
+int init_pipe(const char* pipe_path) {
+	// Remove existing pipe if it exists
+	unlink(pipe_path);
+
+	// Create named pipe with read/write permissions
+	if (mkfifo(pipe_path, 0666) != 0) {
+		if (errno != EEXIST) {
+			fprintf(stderr, "Error creating pipe %s: %s\n", pipe_path, strerror(errno));
+			return -1;
+		}
+	}
+
+	printf("Named pipe created: %s\n", pipe_path);
+
+	// Try to open in non-blocking mode first to check if reader is present
+	int fd = open(pipe_path, O_WRONLY | O_NONBLOCK);
+	if (fd < 0) {
+		if (errno == ENXIO) {
+			// No reader present, try blocking mode
+			printf("No reader detected. Waiting for reader to connect...\n");
+			printf("(You can start the reader program now, e.g.: ./pipe_reader_test.py)\n");
+
+			// Open in blocking mode - will wait for reader
+			fd = open(pipe_path, O_WRONLY);
+			if (fd < 0) {
+				fprintf(stderr, "Error opening pipe for writing: %s\n", strerror(errno));
+				return -1;
+			}
+			printf("Reader connected!\n");
+		} else {
+			fprintf(stderr, "Warning: Could not open pipe for writing: %s\n", strerror(errno));
+			fprintf(stderr, "Pipe will be skipped. Data will only be saved to file.\n");
+			return -1;
+		}
+	} else {
+		printf("Reader already connected!\n");
+		// Set back to blocking mode for writes
+		int flags = fcntl(fd, F_GETFL);
+		fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
+	}
+
+	printf("Pipe opened successfully (fd=%d)\n", fd);
+	return fd;
+}
+
+// Function to close pipe
+void close_pipe(int pipe_fd, const char* pipe_path) {
+	if (pipe_fd >= 0) {
+		close(pipe_fd);
+		unlink(pipe_path);
+		printf("Pipe closed and removed\n");
+	}
+}
+#endif
+
+void receive_to_file(t_x502_hnd hnd, char* logfilename, uint32_t* inp_buff, uint32_t max_total_words, uint32_t timeout, int pipe_fd){
 
 
 
@@ -723,6 +894,44 @@ void receive_to_file(t_x502_hnd hnd, char* logfilename, uint32_t* inp_buff, uint
 	  printf("received %ld words\n", received_words);
 	  fclose(logfile_ptr);
 	  rename(logfilename_tmp, logfilename);
+
+#ifndef _WIN32
+	  // Write data to pipe if it's open
+	  if (pipe_fd >= 0) {
+		  // Check if pipe is ready before writing
+		  int pipe_status = check_pipe_ready(pipe_fd);
+
+		  if (pipe_status == 0) {
+			  // Pipe not ready (buffer full or no reader) - wait for reader
+			  printf("Pipe not ready - waiting for reader to catch up...\n");
+			  int wait_result = wait_for_pipe_reader(pipe_fd);
+			  if (wait_result != 1) {
+				  fprintf(stderr, "Warning: Could not write to pipe\n");
+				  return;
+			  }
+		  } else if (pipe_status < 0) {
+			  fprintf(stderr, "Warning: Pipe error detected, skipping pipe write\n");
+			  return;
+		  }
+
+		  // Pipe is ready, write data
+		  ssize_t bytes_written = write(pipe_fd, inp_buff, received_words * sizeof(uint32_t));
+		  if (bytes_written < 0) {
+			  if (errno == EPIPE) {
+				  fprintf(stderr, "Warning: Broken pipe (reader disconnected)\n");
+			  } else if (errno == EAGAIN || errno == EWOULDBLOCK) {
+				  fprintf(stderr, "Warning: Pipe write would block\n");
+			  } else {
+				  fprintf(stderr, "Warning: Error writing to pipe: %s\n", strerror(errno));
+			  }
+		  } else if (bytes_written < (ssize_t)(received_words * sizeof(uint32_t))) {
+			  printf("Warning: Partial write to pipe: %zd of %zu bytes\n",
+					 bytes_written, received_words * sizeof(uint32_t));
+		  } else {
+			  printf("Written %zd bytes to pipe\n", bytes_written);
+		  }
+	  }
+#endif
   }else if (recv_Err_code == 0){
 	  printf("no data received. timeout\n");
   }else{
@@ -789,9 +998,9 @@ int main(int argc, char** argv) {
     main_state_set_defaults(&state);
     parse_cmd_file(cmd_filename, &state);
     // отладочный вывод принятых значений
-    printf("Parsed state: run_mode=%d, BF_mode=%d, BlackFin_mode=%d, run_length=%u, runs_N=%u, run_I=%u, data_path=%s\n",
+    printf("Parsed state: run_mode=%d, BF_mode=%d, BlackFin_mode=%d, run_length=%u, runs_N=%u, run_I=%u, data_path=%s, save_to_files=%d\n",
            (int)state.run_mode, (int)state.BF_mode, (int)state.BlackFin_mode,
-           state.run_length, state.runs_N, state.run_I, state.data_path);
+           state.run_length, state.runs_N, state.run_I, state.data_path, state.save_to_files);
 
 /* Removed unused temporary buffers and FFT/LFSM placeholders */
 
@@ -876,6 +1085,13 @@ int main(int argc, char** argv) {
 		streams_start_Err = X502_StreamsStart(hnd);
 		printf("Streams start err: %d \n", streams_start_Err);
 
+#ifndef _WIN32
+		// Initialize named pipe
+		printf("Initializing named pipe: %s\n", state.pipe_path);
+		state.pipe_fd = init_pipe(state.pipe_path);
+#else
+		state.pipe_fd = -1;
+#endif
 
 			if (state.run_mode == RUN_MODE_FINITE){
 				if (state.BF_mode == BF_MODE_TRANSPARENT){
@@ -910,7 +1126,7 @@ int main(int argc, char** argv) {
 				//sprintf(&logfilename, "data/received_data_%ld.csv", seconds);
 					snprintf(tmp_data_filename, sizeof(tmp_data_filename), "%s/received_data_%ld.%ld.csv", state.data_path, ts.tv_sec, ts.tv_nsec);
 					printf("%u/%u dumping to file: %s\n", (unsigned)state.run_I, (unsigned)state.runs_N, tmp_data_filename);
-					receive_to_file(hnd, tmp_data_filename, inp_buff,  max_total_words, state.run_length);
+					receive_to_file(hnd, tmp_data_filename, inp_buff,  max_total_words, state.run_length, state.pipe_fd);
 					if (runs_since_streams_clean >= 10){
 						runs_since_streams_clean = 0;
 						X502_StreamsStop(hnd);
@@ -919,6 +1135,9 @@ int main(int argc, char** argv) {
 					state.run_I++;
 					runs_since_streams_clean++;				  }
 				  free(inp_buff);
+#ifndef _WIN32
+				  close_pipe(state.pipe_fd, state.pipe_path);
+#endif
 					  X502_Close(hnd);
 					  // освобождаем описатель
 				  X502_Free(hnd);
@@ -959,7 +1178,7 @@ int main(int argc, char** argv) {
 				//sprintf(&logfilename, "data/received_data_%ld.csv", seconds);
 					snprintf(tmp_data_filename, sizeof(tmp_data_filename), "%s/received_data_%ld.%ld.csv", state.data_path, ts.tv_sec, ts.tv_nsec);
 						printf("%u dumping to file: %s\n", (unsigned)state.run_I, tmp_data_filename);
-					receive_to_file(hnd, tmp_data_filename, inp_buff,  max_total_words, state.run_length);
+					receive_to_file(hnd, tmp_data_filename, inp_buff,  max_total_words, state.run_length, state.pipe_fd);
 					if (runs_since_streams_clean >= 10){
 						runs_since_streams_clean = 0;
 						X502_StreamsStop(hnd);
@@ -969,6 +1188,9 @@ int main(int argc, char** argv) {
 					runs_since_streams_clean++;
 				  }
 				  free(inp_buff);
+#ifndef _WIN32
+				  close_pipe(state.pipe_fd, state.pipe_path);
+#endif
 					  X502_Close(hnd);
 					  // освобождаем описатель
 				  X502_Free(hnd);
@@ -1100,7 +1322,7 @@ int main(int argc, char** argv) {
 				struct timespec time_receive_started, time_receive_ended;
 
 				clock_gettime(CLOCK_MONOTONIC, &time_receive_started);
-				receive_to_file(hnd, logfilename, inp_buff,  max_total_words, 10000);
+				receive_to_file(hnd, logfilename, inp_buff,  max_total_words, 10000, state.pipe_fd);
 				clock_gettime(CLOCK_MONOTONIC, &time_receive_ended);
 
 
@@ -1136,7 +1358,7 @@ int main(int argc, char** argv) {
 
 		//		printf("\n dbg value:  ");
 		//		BF_exec_cmd_simple(hnd, 0x800A, 10, 1);
-				receive_to_file(hnd, logfilename, inp_buff,  max_total_words, 10000);
+				receive_to_file(hnd, logfilename, inp_buff,  max_total_words, 10000, state.pipe_fd);
 				printf("\n dbg value:  ");
 				BF_exec_cmd_simple(hnd, 0x800A, 10, 1);