/*
Bypass
Copyright (C) 1999-2001 Douglas Thain
http://www.cs.wisc.edu/condor/bypass
This program is released under the GNU General Public License.
See the file COPYING for details.
*/

/*
This interface definition augments a program to record and display
the number of bytes that pass through read() and write().
*/

agent_prologue
{{
        @include <stdio.h>
	@include <unistd.h>

	static int bytes_read=0;
	static int bytes_written=0;
}};

ssize_t read( int fd, void *data, size_t nbytes )
	agent_action
	{{
		ssize_t result;
		result = read(fd,data,nbytes);
		if(result>0) bytes_read += result;
		return result;
	}};

ssize_t write( int fd, const void *data, size_t nbytes )
	agent_action
	{{
		ssize_t result;
		result = write(fd,data,nbytes);
		if(result>0) bytes_written += result;
		return result;
	}};

void exit( int status )
	agent_action
	{{
		fprintf(stderr,
			"NOTICE: process %d: %d bytes read, %d bytes written\n",
			(int)getpid(), bytes_read, bytes_written );
		exit(status);
	}};