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#include <unistd.h>
#include <fcntl.h>
#include <tcl.h>
#include <tk.h>
#include "gc.h"
#include "exec.h"
#include "sys.h"
#include "fail.h"
#include "io.h"
#include "mlvalues.h"
#include "memory.h"
#include "camltk.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
/*
* Dealing with signals: when a signal handler is defined in Caml,
* the actual execution of the signal handler upon reception of the
* signal is delayed until we are sure we are out of the GC.
* If a signal occurs during the MainLoop, we would have to wait
* the next event for the handler to be invoked.
* The following function will invoke a pending signal handler if any,
* and we put in on a regular timer.
*/
#define SIGNAL_INTERVAL 300
int signal_events = 0; /* do we have a pending timer */
void invoke_pending_caml_signals (clientdata)
ClientData clientdata;
{
signal_events = 0;
enter_blocking_section(); /* triggers signal handling */
/* Rearm timer */
Tk_CreateTimerHandler(SIGNAL_INTERVAL, invoke_pending_caml_signals, NULL);
signal_events = 1;
leave_blocking_section();
}
/* The following is taken from byterun/startup.c */
header_t atom_table[256];
code_t start_code;
asize_t code_size;
static void init_atoms()
{
int i;
for(i = 0; i < 256; i++) atom_table[i] = Make_header(0, i, White);
}
static unsigned long read_size(p)
unsigned char * p;
{
return ((unsigned long) p[0] << 24) + ((unsigned long) p[1] << 16) +
((unsigned long) p[2] << 8) + p[3];
}
#define FILE_NOT_FOUND (-1)
#define TRUNCATED_FILE (-2)
#define BAD_MAGIC_NUM (-3)
static int read_trailer(fd, trail)
int fd;
struct exec_trailer * trail;
{
char buffer[TRAILER_SIZE];
lseek(fd, (long) -TRAILER_SIZE, 2);
if (read(fd, buffer, TRAILER_SIZE) < TRAILER_SIZE) return TRUNCATED_FILE;
trail->code_size = read_size(buffer);
trail->data_size = read_size(buffer+4);
trail->symbol_size = read_size(buffer+8);
trail->debug_size = read_size(buffer+12);
if (strncmp(buffer + 16, EXEC_MAGIC, 12) == 0)
return 0;
else
return BAD_MAGIC_NUM;
}
int attempt_open(name, trail, do_open_script)
char ** name;
struct exec_trailer * trail;
int do_open_script;
{
char * truename;
int fd;
int err;
char buf [2];
truename = searchpath(*name);
if (truename == 0) truename = *name; else *name = truename;
fd = open(truename, O_RDONLY | O_BINARY);
if (fd == -1) return FILE_NOT_FOUND;
if (!do_open_script){
err = read (fd, buf, 2);
if (err < 2) { close(fd); return TRUNCATED_FILE; }
if (buf [0] == '#' && buf [1] == '!') { close(fd); return BAD_MAGIC_NUM; }
}
err = read_trailer(fd, trail);
if (err != 0) { close(fd); return err; }
return fd;
}
/* Command for loading the bytecode file */
int CamlRunCmd(dummy, interp, argc, argv)
ClientData dummy; /* Not used. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
int fd;
struct exec_trailer trail;
struct longjmp_buffer raise_buf;
struct channel * chan;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " foo.cmo args\"", (char *) NULL);
return TCL_ERROR;
}
fd = attempt_open(&argv[1], &trail, 1);
switch(fd) {
case FILE_NOT_FOUND:
fatal_error_arg("Fatal error: cannot find file %s\n", argv[1]);
break;
case TRUNCATED_FILE:
case BAD_MAGIC_NUM:
fatal_error_arg(
"Fatal error: the file %s is not a bytecode executable file\n",
argv[1]);
break;
}
if (sigsetjmp(raise_buf.buf, 1) == 0) {
external_raise = &raise_buf;
lseek(fd, - (long) (TRAILER_SIZE + trail.code_size + trail.data_size
+ trail.symbol_size + trail.debug_size), 2);
code_size = trail.code_size;
start_code = (code_t) stat_alloc(code_size);
if (read(fd, (char *) start_code, code_size) != code_size)
fatal_error("Fatal error: truncated bytecode file.\n");
#ifdef ARCH_BIG_ENDIAN
fixup_endianness(start_code, code_size);
#endif
chan = open_descr(fd);
global_data = input_value(chan);
close_channel(chan);
/* Ensure that the globals are in the major heap. */
oldify(global_data, &global_data);
sys_init(argv + 1);
interprete(start_code, code_size);
return TCL_OK;
} else {
Tcl_AppendResult(interp, "Caml program", argv[1], " raised exception \"",
String_val(Field(Field(exn_bucket, 0), 0)));
return TCL_ERROR;
}
}
int CamlInvokeCmd(dummy
/* Now the real Tk stuff */
static Tk_Window mainWindow;
#define RCNAME ".camltkrc"
#define CAMLCB "camlcb"
/* Initialisation of the dynamically loaded module */
int Caml_Init(interp)
Tcl_Interp *interp;
{
cltclinterp = interp;
/* Create the camlcallback command */
Tcl_CreateCommand(cltclinterp,
CAMLCB, CamlCBCmd,
(ClientData)NULL,(Tcl_CmdDeleteProc *)NULL);
/* This is required by "unknown" and thus autoload */
Tcl_SetVar(cltclinterp, "tcl_interactive", "0", TCL_GLOBAL_ONLY);
/* Our hack for implementing break in callbacks */
Tcl_SetVar(cltclinterp, "BreakBindingsSequence", "0", TCL_GLOBAL_ONLY);
/* Load the traditional rc file */
{
char *home = getenv("HOME");
if (home != NULL) {
char *f = stat_alloc(strlen(home)+strlen(RCNAME)+2);
f[0]='\0';
strcat(f, home);
strcat(f, "/");
strcat(f, RCNAME);
if (0 == access(f,R_OK))
if (TCL_OK != Tcl_EvalFile(cltclinterp,f)) {
stat_free(f);
tk_error(cltclinterp->result);
};
stat_free(f);
}
}
/* Initialisations from caml_main */
{
int verbose_init = 0,
percent_free_init = Percent_free_def;
long minor_heap_init = Minor_heap_def,
heap_chunk_init = Heap_chunk_def;
/* Machine-dependent initialization of the floating-point hardware
so that it behaves as much as possible as specified in IEEE */
init_ieee_floats();
init_gc (minor_heap_init, heap_chunk_init, percent_free_init,
verbose_init);
init_stack();
init_atoms();
}
}
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