From: Bernhard Tittelbach <xro@realraum.at>
Date: Fri, 5 Mar 2010 17:38:43 +0000 (+0000)
Subject: Small Socket<->Terminal and Serial<->Terminal Tool
X-Git-Url: https://git.realraum.at/?a=commitdiff_plain;h=b339ede7f462ec30fd9a0487b50949a63801be9b;p=svn42.git

Small Socket<->Terminal and Serial<->Terminal Tool
---

diff --git a/serial_console/Makefile b/serial_console/Makefile
new file mode 100644
index 0000000..15c62c6
--- /dev/null
+++ b/serial_console/Makefile
@@ -0,0 +1,10 @@
+TARGET1:=serial
+TARGET2:=usocket
+CFLAGS:= -Wall
+
+all: $(TARGET1) $(TARGET2)
+
+.PHONY: clean all
+
+clean: 
+	rm -f $(TARGET1) $(TARGET2)
\ No newline at end of file
diff --git a/serial_console/serial.c b/serial_console/serial.c
index 601e87f..0e4715a 100644
--- a/serial_console/serial.c
+++ b/serial_console/serial.c
@@ -87,8 +87,8 @@ int restore_tty(int fd, struct termios  *termios_prev)
   int ret = tcsetattr(fd, TCSANOW, termios_prev);
   if(ret) {
     fprintf(stderr, "Error on tcsetattr(): %s", strerror(errno));
-    return ret;
   }
+  return ret;  
 }
 
 void  connect_terminal(int door_fd)
@@ -106,7 +106,7 @@ void  connect_terminal(int door_fd)
   {
     if (FD_ISSET(door_fd,&fds_r))
     {
-      if (num_byte = read(door_fd,buffer, 1) > 0)
+      if ((num_byte = read(door_fd,buffer, 1)) > 0)
       {
         write(STDOUT_FILENO,buffer,num_byte);
       }
@@ -115,7 +115,7 @@ void  connect_terminal(int door_fd)
     }    
     if (FD_ISSET(STDIN_FILENO,&fds_r))
     {
-      while(num_byte = read(STDIN_FILENO,buffer, 256) > 0)
+      while((num_byte = read(STDIN_FILENO,buffer, 256)) > 0)
       {
         write(door_fd,buffer,num_byte);
       }
diff --git a/serial_console/usocket.c b/serial_console/usocket.c
new file mode 100644
index 0000000..7008090
--- /dev/null
+++ b/serial_console/usocket.c
@@ -0,0 +1,142 @@
+#include "usocket.h"
+
+
+int set_tty_raw(int fd, struct termios *termios_prev)
+{
+  struct termios tmio;
+  
+  int ret = tcgetattr(fd, &tmio);
+  if(ret) {
+    fprintf(stderr, "Error on tcgetattr(): %s\n", strerror(errno));
+    return ret;
+  }
+  
+  memcpy(termios_prev, &tmio,sizeof(struct termios));
+  
+  cfmakeraw(&tmio);
+  
+  ret = tcsetattr(fd, TCSANOW, &tmio);
+  if(ret) {
+    fprintf(stderr, "Error on tcsetattr(): %s\n", strerror(errno));
+    return ret;
+  }  
+  
+  fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);
+  
+  return 0;
+}
+
+int restore_tty(int fd, struct termios  *termios_prev)
+{
+  int ret = tcsetattr(fd, TCSANOW, termios_prev);
+  if(ret) {
+    fprintf(stderr, "Error on tcsetattr(): %s\n", strerror(errno));
+  }
+  return ret;
+}
+
+void  connect_terminal(int fd)
+{
+  if (fd < 3)
+    return;
+  fd_set fds_r;
+  char buffer[1024];
+  int num_byte=0;
+  FD_ZERO(&fds_r);
+
+  FD_SET(STDIN_FILENO,&fds_r);
+  FD_SET(fd,&fds_r);
+  while (select(fd+1,&fds_r,0,0,0) > 0)
+  {
+    if (FD_ISSET(fd,&fds_r))
+    {
+      if ((num_byte = recv(fd,buffer, 1024,0)) > 0)
+      {
+        //~ printf("%d:%s\n",num_byte,buffer);
+        write(STDOUT_FILENO,buffer,num_byte);
+      }
+      if (num_byte == 0 || (num_byte <0 && errno != EAGAIN))
+        return;
+    }    
+    if (FD_ISSET(STDIN_FILENO,&fds_r))
+    {
+      while((num_byte = read(STDIN_FILENO,buffer, 1024)) > 0)
+      {
+        send(fd,buffer,num_byte,0);
+      }
+      if (num_byte <0 && errno != EAGAIN)
+        return;
+    }
+    
+    FD_SET(STDIN_FILENO,&fds_r);
+    FD_SET(fd,&fds_r);
+  }
+}
+
+int establish_socket_connection(const char* path)
+{
+  int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+  if(fd < 0) {
+    fprintf(stderr, "unable to open socket: %s\n", strerror(errno));
+    return -1;
+  }
+
+  struct sockaddr_un local;
+  local.sun_family = AF_UNIX;
+  if(sizeof(local.sun_path) <= strlen(path)) {
+    fprintf(stderr, "socket path is to long (max %lu)\n", sizeof(local.sun_path)-1);
+    return -1;
+  }
+  
+  strcpy(local.sun_path, path);
+  int len = SUN_LEN(&local);
+  int ret = connect(fd, (struct sockaddr*) &local, len);
+  if(ret) {
+    fprintf(stderr, "unable to bind to '%s': %s\n", local.sun_path, strerror(errno));
+    return -1;
+  }
+  
+  return fd;
+}
+
+
+int main(int argc, char* argv[])
+{
+  int ret = 0;
+  int socket_fd = 0;
+  //~ struct termios tmio_prev;
+  
+  if (argc > 0)
+    socket_file_ = argv[1];
+  
+  for(;;) 
+  {
+    socket_fd = establish_socket_connection(socket_file_);
+    if(socket_fd < 0)
+      ret = 2;
+    else {
+      //~ ret = set_tty_raw(STDIN_FILENO,&tmio_prev);
+      //~ if (ret)
+        //~ break;
+      fcntl(STDIN_FILENO, F_SETFL, O_NONBLOCK);
+      connect_terminal(socket_fd);
+        
+      //~ ret = restore_tty(STDIN_FILENO,&tmio_prev);
+      //~ if (ret)
+        //~ break;        
+    }
+    if (ret == 2) {
+      fprintf(stderr, "%s error, trying to reopen in 5 seconds..\n", socket_file_);
+      if(socket_fd > 0)
+        shutdown(socket_fd,SHUT_RDWR);
+      sleep(5);
+    }
+    else
+      break;
+  }
+
+  if(socket_fd > 0)
+    shutdown(socket_fd,SHUT_RDWR);
+  return(ret);
+}
+
diff --git a/serial_console/usocket.h b/serial_console/usocket.h
new file mode 100644
index 0000000..3bb470a
--- /dev/null
+++ b/serial_console/usocket.h
@@ -0,0 +1,14 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/un.h>
+
+char const *socket_file_="/var/run/sensor.socket";
+