/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors.
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors in the documentation and/or
 *    other materials provided with the distribution.
 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/gen_calls.h>
#include <sys/thread.h>
#include <ubixos/sched.h>
#include <ubixos/endtask.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>
#include <string.h>
#include <assert.h>
#include <sys/descrip.h>
#include <sys/video.h>

/* Exit Syscall */
int sys_exit( struct thread *td, struct sys_exit_args *args ) {
  endTask( _current->id );
  return (0x0);
}

/* return the process id */
int getpid( struct thread *td, struct getpid_args *uap ) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  td->td_retval[0] = _current->id;
  return (0);
}

/* return the process user id */
int getuid( struct thread *td, struct getuid_args *uap ) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  td->td_retval[0] = _current->uid;
  return (0);
}

/* return the process group id */
int getgid( struct thread *td, struct getgid_args *uap ) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  td->td_retval[0] = _current->gid;
  return (0);
}

int sys_issetugid( register struct thread *td, struct sys_issetugid_args *uap ) {
  td->td_retval[0] = 0;
  return (0);
}

int readlink( struct thread *td, struct readlink_args *uap ) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  kprintf( "readlink: [%s:%i]\n", uap->path, uap->count );
  td->td_retval[0] = -1;
  td->td_retval[1] = 0x0;
  return (0x0);
}

int gettimeofday_new( struct thread *td, struct gettimeofday_args *uap ) {
#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif
  return (0x0);
}

int read( struct thread *td, struct read_args *uap ) {
  int error = 0x0;
  size_t count = 0x0;
  struct file *fd = 0x0;

#ifdef DEBUG
  kprintf("[%s:%i]",__FILE__,__LINE__);
#endif

  error = getfd( td, &fd, uap->fd );

  if ( error )
    return (error);

  count = fread( uap->buf, uap->nbyte, 0x1, fd->fd );
  kprintf( "count: %i\n", count );
  td->td_retval[0] = count;

  return (error);
}

/*!
 * \brief place holder for now functionality to be added later
 */
int setitimer( struct thread *td, struct setitimer_args *uap ) {
  int error = 0x0;

  return (error);
}

int access( struct thread *td, struct access_args *uap ) {
  int error = 0x0;
  kprintf( "name: [%s]\n", uap->path );
  return (error);
}

int mprotect( struct thread *td, struct mprotect_args *uap ) {
  int error = 0x0;
  return (error);
}

int sys_invalid( struct thread *td, void *args ) {
  kprintf( "Invalid System Call #[%i], Pid: %i\n", td->frame->tf_eax, _current->id );
 //td->td_retval[0] =0;
  return (0);
}

int sys_wait4( struct thread *td, struct sys_wait4_args *args ) {
  //kprintf("DUMMY FUNC FIX ME! sys_wait4");
  kTask_t *tmpTask = schedFindTask( args->pid );
  if ( tmpTask != 0x0 )
    return (tmpTask->state);
  return (0);
}