minix/servers/iso9660fs/main.c

/* This file contains the main directory for the server. It waits for a 
 * request and then send a response. */

#include "inc.h"
#include <minix/vfsif.h>
#include <assert.h>
#include "const.h"
#include "glo.h"

/* Declare some local functions. */
FORWARD _PROTOTYPE(void get_work, (message *m_in)			);

/* SEF functions and variables. */
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
FORWARD _PROTOTYPE( int sef_cb_init_fresh, (int type, sef_init_info_t *info) );
FORWARD _PROTOTYPE( void sef_cb_signal_handler, (int signo) );

/*===========================================================================*
 *				main                                         *
 *===========================================================================*/
PUBLIC int main(void) {
  endpoint_t who_e;
  int ind, error, transid;

  /* SEF local startup. */
  sef_local_startup();

  for (;;) {

	/* Wait for request message. */
	get_work(&fs_m_in);

	transid = TRNS_GET_ID(fs_m_in.m_type);
	fs_m_in.m_type = TRNS_DEL_ID(fs_m_in.m_type);
	if (fs_m_in.m_type == 0) {
		assert(!IS_VFS_FS_TRANSID(transid));
		fs_m_in.m_type = transid;	/* Backwards compat. */
		transid = 0;
	} else
		assert(IS_VFS_FS_TRANSID(transid));

	error = OK;

	caller_uid = -1;	/* To trap errors */
	caller_gid = -1;

	who_e = fs_m_in.m_source;	/* source of the request */

	if (who_e != VFS_PROC_NR) { /* If the message is not for us just 
				    * continue */
		continue;
	}

	req_nr = fs_m_in.m_type;

	if (req_nr < VFS_BASE) {
		fs_m_in.m_type += VFS_BASE;
		req_nr = fs_m_in.m_type;
	}

	ind = req_nr-VFS_BASE;

	if (ind < 0 || ind >= NREQS) {
		error = EINVAL; 
	} else
		error = (*fs_call_vec[ind])(); /* Process the request calling
						* the appropriate function. */

	fs_m_out.m_type = error; 
	if (IS_VFS_FS_TRANSID(transid)) {
		/* If a transaction ID was set, reset it */
		fs_m_out.m_type = TRNS_ADD_ID(fs_m_out.m_type, transid);
	}
	reply(who_e, &fs_m_out); 	/* returns the response to VFS */
  }
}

/*===========================================================================*
 *			       sef_local_startup			     *
 *===========================================================================*/
PRIVATE void sef_local_startup()
{
  /* Register init callbacks. */
  sef_setcb_init_fresh(sef_cb_init_fresh);
  sef_setcb_init_restart(sef_cb_init_fail);

  /* No live update support for now. */

  /* Register signal callbacks. */
  sef_setcb_signal_handler(sef_cb_signal_handler);

  /* Let SEF perform startup. */
  sef_startup();
}

/*===========================================================================*
 *		            sef_cb_init_fresh                                *
 *===========================================================================*/
PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
{
/* Initialize the iso9660fs server. */

   /* SELF_E will contain the id of this process */
   SELF_E = getprocnr();
/*    hash_init(); */			/* Init the table with the ids */
   setenv("TZ","",1);		/* Used to calculate the time */

   return(OK);
}

/*===========================================================================*
 *				sef_cb_signal_handler			     *
 *===========================================================================*/
PRIVATE void sef_cb_signal_handler(int signo)
{
  /* Only check for termination signal, ignore anything else. */
  if (signo != SIGTERM) return;

  /* No need to do a sync, as this is a read-only file system. */

  /* If the file system has already been unmounted, exit immediately.
   * We might not get another message.
   */
  if (unmountdone) exit(0);
}

/*===========================================================================*
 *				get_work                                     *
 *===========================================================================*/
PRIVATE void get_work(m_in)
message *m_in;				/* pointer to message */
{
  int s;					/* receive status */
  if (OK != (s = sef_receive(ANY, m_in))) 	/* wait for message */
    panic("sef_receive failed: %d", s);
}

/*===========================================================================*
 *				reply					     *
 *===========================================================================*/
PUBLIC void reply(who, m_out)
int who;	
message *m_out;                       	/* report result */
{
  if (OK != send(who, m_out))    /* send the message */
    printf("ISOFS(%d) was unable to send reply\n", SELF_E);
}