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ix_init.c
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C/C++ Source or Header
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1996-10-01
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5KB
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185 lines
/*
* This file is part of ixemul.library for the Amiga.
* Copyright (C) 1991, 1992 Markus M. Wild
* Portions Copyright (C) 1994 Rafael W. Luebbert
* Portions Copyright (C) 1995 Jeff Shepherd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define _KERNEL
#include "ixemul.h"
#include "kprintf.h"
#include <exec/memory.h>
#include <dos/var.h>
#include <string.h>
#include <unistd.h>
/* not changed after the library is initialized */
struct ixemul_base *ixemulbase = NULL;
struct ExecBase *SysBase = NULL;
struct DosLibrary *DOSBase = NULL;
struct MathIeeeSingBasBase *MathIeeeSingBasBase = NULL;
struct MathIeeeDoubBasBase *MathIeeeDoubBasBase = NULL;
struct MathIeeeDoubTransBase *MathIeeeDoubTransBase = NULL;
struct Library *muBase = NULL;
static struct
{
void **base;
char *name;
ULONG minver; /* minimal version */
BOOL opt; /* no fail if not available */
}
ix_libs[] =
{
{ (void **)&DOSBase, "dos.library" },
{ (void **)&MathIeeeSingBasBase, "mathieeesingbas.library" },
{ (void **)&MathIeeeDoubBasBase, "mathieeedoubbas.library" },
{ (void **)&MathIeeeDoubTransBase, "mathieeedoubtrans.library" },
{ (void **)&muBase, "multiuser.library", 39, TRUE },
{ NULL, NULL }
};
static void ix_task_switcher(void)
{
for (;;)
Wait(1 << 31);
}
int open_libraries(void)
{
int i;
for (i = 0; ix_libs[i].base; i++)
if (!(*(ix_libs[i].base) = (void *)OpenLibrary(ix_libs[i].name, ix_libs[i].minver))
&& !ix_libs[i].opt)
{
ix_panic("%s required!", ix_libs[i].name);
return 0;
}
return 1;
}
void close_libraries(void)
{
int i;
for (i = 0; ix_libs[i].base; i++)
if (*ix_libs[i].base)
CloseLibrary(*ix_libs[i].base);
}
struct ixemul_base *ix_init (struct ixemul_base *ixbase)
{
int i;
char buf[256];
extern char hostname[]; /* in getcrap.c */
ixemulbase = ixbase;
if (!open_libraries())
{
close_libraries();
return 0;
}
ixbase->ix_file_tab = (struct file *)AllocMem (NOFILE * sizeof(struct file), MEMF_PUBLIC | MEMF_CLEAR);
ixbase->ix_fileNFILE = ixbase->ix_file_tab + NOFILE;
ixbase->ix_lastf = ixbase->ix_file_tab;
memset(&ixbase->ix_notify_request, 0, sizeof(ixbase->ix_notify_request));
memset(&ixbase->ix_ptys, 0, sizeof(ixbase->ix_ptys));
/* Read the GMT offset. This environment variable is 5 bytes long. The
first 4 form a long that contains the offset in seconds and the fifth
byte is ignored. */
if (GetVar("IXGMTOFFSET", buf, 6, GVF_BINARY_VAR) == 5 && IoErr() == 5)
ix_set_gmt_offset(*((long *)buf));
else
ix_set_gmt_offset(0);
if (GetVar(IX_ENV_SETTINGS, buf, sizeof(struct ix_settings) + 1, GVF_BINARY_VAR) == sizeof(struct ix_settings))
ix_set_settings((struct ix_settings *)buf);
else
ix_set_settings(ix_get_default_settings());
/* Set the hostname if the environment variable HOSTNAME exists. */
if (GetVar("HOSTNAME", buf, 64, 0) > 0)
strcpy(hostname, buf);
/* initialize the list structures for the allocator */
init_buddy ();
ixbase->ix_task_switcher = CreateTask("ixemul task switcher", 9, ix_task_switcher, 1000);
/* initialize port number for AF_UNIX(localhost) sockets */
ixbase->ix_next_free_port = 1024;
if (ixbase->ix_file_tab)
{
InitSemaphore (& ixbase->ix_semaph);
configure_context_switch ();
NewList ((struct List *) &ixbase->ix_socket_list);
for (i = 0; i < IX_NUM_SLEEP_QUEUES; i++)
NewList ((struct List *) &ixbase->ix_sleep_queues[i]);
ixbase->ix_global_environment = NULL;
return ixbase;
}
if (ixbase->ix_task_switcher)
{
Forbid();
DeleteTask(ixbase->ix_task_switcher);
Permit();
}
if (ixbase->ix_file_tab)
FreeMem (ixbase->ix_file_tab, NOFILE * sizeof(struct file));
else
ix_panic ("out of memory");
close_libraries();
return 0;
}
void ix_lock_base (void)
{
int old = u.p_sigmask;
u.p_sigmask = ~0;
ObtainSemaphore(&ix.ix_semaph);
if (ix.ix_semaph.ss_NestCount == 1)
u.u_oldmask = old;
}
void ix_unlock_base (void)
{
int old = u.p_sigmask;
if (ix.ix_semaph.ss_NestCount == 1)
old = u.u_oldmask;
ReleaseSemaphore(&ix.ix_semaph);
u.p_sigmask = old;
}