xenocara/app/fvwm/extras/FvwmCommand/FvwmCommandS.c

/* $Id: FvwmCommandS.c,v 1.1.1.1 2006/11/26 10:53:10 matthieu Exp $
 * $Source: /home/cvs/xenocara/app/fvwm/extras/FvwmCommand/Attic/FvwmCommandS.c,v $
 *
 * Fvwm command input interface.
 *
 * Copyright 1997, Toshi Isogai. No guarantees or warantees or anything
 * are provided. Use this program at your own risk. Permission to use 
 * this program for any purpose is given,
 * as long as the copyright is kept intact. 
 *
 */

#include "FvwmCommand.h"

#define MYNAME   "FvwmCommandS"

int  Fd[2];  /* pipe to fvwm */
int  Ffdr;   /* command fifo file discriptors */
int  Ffdw;   /* message fifo file discriptors */
char *F_name, *Fc_name, *Fm_name; /* fifo name */
char Nounlink;   /* don't delete fifo when true */
char Connect;    /* client is connected */

int  open_fifos (char *f_stem);
void close_fifos();
void close_pipes();
void DeadPipe( int );
void err_msg( char *msg );
void err_quit( char *msg );
void process_message(unsigned long type,unsigned long *body);
void relay_packet( unsigned long, unsigned long, unsigned long *);
void server( char * );
void sig_handler( int );
int  write_f (int fd, char *p, int len);

int main(int argc, char *argv[]) {
  char *fifoname;

  if(argc < FARGS)    {
    fprintf(stderr,"%s Version %s should only be executed by fvwm!\n",
	    MYNAME, MYVERSION);
    exit(1);
  }

  if( argc == FARGS+1 ) {
    fifoname = argv[FARGS];
  }else{
    fifoname = NULL;
  }

  signal (SIGPIPE, DeadPipe);
  signal (SIGINT, sig_handler);  
  signal (SIGQUIT, sig_handler);  
  signal (SIGHUP, sig_handler);  
  signal (SIGTERM, sig_handler);  
  
  Fd[0] = atoi(argv[1]);
  Fd[1] = atoi(argv[2]);

  Nounlink = 0;
  
  server( fifoname );
  exit(1);
}

/*
 *	signal handler
 */
void DeadPipe( int dummy ) {
  fprintf(stderr,"%s: dead pipe\n", MYNAME);
  close_pipes();
  exit(0);

}

void sig_handler(int signo) {
  close_pipes();
  exit(1);
}

/*
 * setup server and communicate with fvwm and the client 
 */
void server ( char *name ) {
  char *home;
  char *f_stem;
  int  len;
  fd_set fdset;
  unsigned long *body;
  unsigned long header[HEADER_SIZE];
  char buf[MAX_COMMAND_SIZE];  /* command receiving buffer */
  char cmd[MAX_COMMAND_SIZE];
  int  ix,cix;

  if( name == NULL ) {
    /* default name */
    home = getenv("HOME");
    f_stem = safemalloc( strlen(home)+ strlen(F_NAME) + 3);
    strcpy (f_stem, home);
    if (f_stem[strlen(f_stem)-1] != '/') {
      strcat (f_stem, "/");
    }
    strcat (f_stem, F_NAME);
  }else{
    f_stem = name;
  }

  if (open_fifos (f_stem) < 0) {
    exit (-1);
  }
  SendText(Fd," ",0); /* tell fvwm that we are here */

  cix = 0;

  while (1){
    FD_ZERO(&fdset);
    FD_SET(Ffdr, &fdset);
    FD_SET(Fd[1], &fdset);

    if (select(FD_SETSIZE, SELECT_TYPE_ARG234 &fdset, 0, 0, NULL) < 0) {
      if (errno == EINTR) {
	continue;
      }
    }
    
    if (FD_ISSET(Fd[1], &fdset)){
      if( ReadFvwmPacket(Fd[1],header,&body) > 0)	 {
	if (Connect) {
	  process_message(header[1], body);
	}
	free(body);
      }
    }
    
    if (FD_ISSET(Ffdr, &fdset)){
      len = read( Ffdr, buf, MAX_COMMAND_SIZE-1 );
      if (len == 0) {
	continue;
      }
      if (len < 0) {
	if (errno != EAGAIN && errno != EINTR) {
	err_quit("reading fifo");
	}
      }

      Connect = 1;
      /* in case of multiple long lines */
      for (ix=0; ix<len; ix++) {
	cmd[cix] = buf[ix];
	if (cmd[cix] == '\n') {
	  cmd[cix+1] = '\0';
	  cix = 0;
	  if (!strncmp (cmd, CMD_CONNECT, strlen(CMD_CONNECT))) {
	    /* do nothing */
	  } else if (!strcmp (cmd, CMD_EXIT)) {
	    Connect = 0;
	    break;
	  } else {
	    if (!strcmp (cmd, CMD_KILL_NOUNLINK)) {
	      Nounlink = 1;
	      strcpy (cmd, "killme" );
	    }
	    SendText (Fd,cmd,0);
	  }
	}else{
	  if (cix >= MAX_COMMAND_SIZE-1) {
	    err_msg ("command too long");
	    cix = 0;
	  } else {
	    cix++;
	  }
	}
      }
    }
  }
}

/*
 * close  fifos and pipes
 */
void close_pipes() {
  close (Fd[0]);
  close (Fd[1]);
  close_fifos();
}

void close_fifos () {
  close (Ffdw);
  close (Ffdr);
  if (!Nounlink) {
    strcat (F_name,"C");
    unlink (F_name);
    F_name[strlen(F_name)-1] = 'M';
    unlink (F_name);
    F_name[strlen(F_name)-1] = 'R';
    unlink (F_name);
  }
  free (F_name);
  Ffdr = -1;
  Ffdw = -1;
}

/*
 * open fifos
 */
int open_fifos (char *f_stem) {
  char *fc_name, *fm_name;
  
  /* create 2 fifos */
  fc_name = malloc( strlen(f_stem) + 2 );
  if (fc_name == NULL) {
    err_msg( "allocating command" );
    return -1;
  }
  fm_name = malloc( strlen(f_stem) + 2 );
  if (fm_name == NULL) {
    err_msg( "allocating message" );
    return -1;
  }
  strcpy(fc_name,f_stem);
  strcpy(fm_name,f_stem);
  strcat(fc_name, "C");
  strcat(fm_name, "M");
  
  if( (Ffdw = open(fc_name, O_RDWR | O_NONBLOCK ) ) > 0) {
    write_f( Ffdw, CMD_KILL_NOUNLINK, strlen(CMD_KILL_NOUNLINK) );  
    close( Ffdw );
  }

  unlink( fm_name ); 
  unlink( fc_name ); 
  
  if( mkfifo( fm_name, S_IRUSR | S_IWUSR ) < 0 ) {
    err_msg( fm_name );
    return -1;
  }
  if( mkfifo( fc_name, S_IRUSR | S_IWUSR ) < 0 ) {
    err_msg( fc_name );
    return -1;
  }
  
  Ffdr = open(fc_name, O_RDWR | O_NONBLOCK | O_TRUNC);
  if (Ffdr < 0) {
    err_msg( "opening command fifo" );
    return -1;
  }
  free(fc_name);
  Ffdw = open(fm_name, O_RDWR | O_NONBLOCK | O_TRUNC);
  if (Ffdw < 0) {
    err_msg( "opening message fifo" );
    return -1;
  }
  free(fm_name);
  
  F_name = malloc (strlen (f_stem) + 2);
  if (F_name == NULL) {
    err_msg( "allocating name string" );
    return -1;
  }
  strcpy (F_name, f_stem);
  
  return 0;
}


/*
 * Process window list messages 
 */

void process_message(unsigned long type,unsigned long *body){
  int  msglen;
  
  switch(type) {
    
  case M_CONFIGURE_WINDOW:
    relay_packet( type, 24*SOL, body );
    break;
    
  case M_WINDOW_NAME:
  case M_ICON_NAME:
  case M_RES_CLASS:
  case M_RES_NAME:
  case M_ICON_FILE:
  case M_DEFAULTICON:
    msglen = strlen( (char *)&body[3] );
    relay_packet( type, msglen+1+3*SOL, body );
    break;
    
  case M_END_WINDOWLIST:
  case M_END_CONFIG_INFO:
    relay_packet( type, 0*SOL, body );
    break;
    
  case M_ICON_LOCATION:
    relay_packet( type, 7*SOL, body );
    break;
    
  case M_ERROR:
  case M_STRING:
  case M_CONFIG_INFO:
    msglen = strlen( (char *)&body[3] );
    relay_packet( type, msglen+1+3*SOL, body );
    break;
    

  case M_MINI_ICON:
    relay_packet( type, 6*SOL, body );
    break;
		

  case M_NEW_PAGE:
    relay_packet( type, 5*SOL, body );
    break;
		
  case M_NEW_DESK:
    relay_packet( type, 1*SOL, body );
    break;

  case M_ADD_WINDOW:
    relay_packet( type, 24*SOL, body );
    break;
				
  case M_RAISE_WINDOW:
  case M_LOWER_WINDOW:
  case M_FOCUS_CHANGE:
  case M_DESTROY_WINDOW:
  case M_DEICONIFY:
  case M_MAP:
  case M_WINDOWSHADE:
  case M_DEWINDOWSHADE:
    relay_packet( type, 4*SOL, body );
    break;
		
  case M_ICONIFY:
    relay_packet( type, 7*SOL, body );

    break;
		
  default:
    relay_packet( type, 4*SOL, body );
  }
}



/*
 * print error message on stderr and exit 
 */

void err_msg( char *msg ) {
  fprintf( stderr, "%s server error in %s, %s\n", 
	   MYNAME, msg, strerror(errno) );
}

void err_quit( char *msg ) {
  err_msg (msg);
  close_pipes();
  exit(1);
}

/*
 * relay packet to front-end
 */
void relay_packet( unsigned long type, 
		   unsigned long length, unsigned long *body) {
  write_f( Ffdw, (char*)&type, SOL );
  write_f( Ffdw, (char*)&length, SOL );
  write_f( Ffdw, (char*)body, length );
}

/*
 * write to fifo
 */
int write_f (int fd, char *p, int len) {
  int    i, n;
  struct timeval tv;
  int    again;
  static int giveup=0;

  again = 0;
  tv.tv_sec = 0;
  tv.tv_usec = 50000;

  for (i=0; i<len; )  {
    n = write (fd, &p[i], len-i);
    if (n<0) {
      if( errno==EINTR) {
	continue;
      } else if (errno==EAGAIN ) {
	if (again++ < 5) {
	  select(0, 0, 0, 0, &tv);
	  continue;
	}else{
	  if (giveup++ > 20) {
	    Connect = 0;
	  }
	  return -1; /* give up this message */
	}
      }
      err_quit ("writing fifo");
    }
    i += n;
  }
  giveup = 0;
  return 0;
}