minix3/fs/iso9660fs/main.c

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2020-02-21 00:59:27 +05:30
/* 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. */
static void get_work(message *m_in);
/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init_fresh(int type, sef_init_info_t *info);
static void sef_cb_signal_handler(int signo);
/*===========================================================================*
* main *
*===========================================================================*/
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 < FS_BASE) {
fs_m_in.m_type += FS_BASE;
req_nr = fs_m_in.m_type;
}
ind = req_nr-FS_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 *
*===========================================================================*/
static 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();
lmfs_buf_pool(10);
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
static int sef_cb_init_fresh(int type, sef_init_info_t *info)
{
/* Initialize the iso9660fs server. */
/* hash_init(); */ /* Init the table with the ids */
setenv("TZ","",1); /* Used to calculate the time */
return(OK);
}
/*===========================================================================*
* sef_cb_signal_handler *
*===========================================================================*/
static 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 *
*===========================================================================*/
static 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 *
*===========================================================================*/
void reply(who, m_out)
int who;
message *m_out; /* report result */
{
if (OK != ipc_send(who, m_out)) /* send the message */
printf("ISOFS(%d) was unable to send reply\n", sef_self());
}