ikarus/bin/ikarus-main.c

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#include "ikarus.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
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#include <gmp.h>
#include <signal.h>
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void register_handlers();
void register_alt_stack();
ikpcb* the_pcb;
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/* get_option
takes pointers to argc and argv and looks for the first
option matching opt. If one exists, it removes it from the argv
list, updates argc, and returns a pointer to the option value.
returns null if option is not found.
*/
char*
get_option(char* opt, int argc, char** argv){
int i;
for(i=1; i<argc; i++){
if(strcmp(opt, argv[i]) == 0){
if((i+1) < argc){
char* rv = argv[i+1];
int j;
for(j=i+2; j<argc; j++, i++){
argv[i] = argv[j];
}
return rv;
}
else {
fprintf(stderr, "Error: option %s not provided\n", opt);
exit(-1);
}
}
else if(strcmp("--", argv[i]) == 0){
return 0;
}
}
return 0;
}
int
file_exists(char* filename){
struct stat sb;
int s = stat(filename, &sb);
return (s == 0);
}
int
copy_fst_path(char* buff, char* x){
int i = 0;
while(1){
char c = x[i];
if ((c == 0) || (c == ':')){
return i;
}
buff[i] = c;
i++;
}
}
int global_exe(char* x){
while(1){
char c = *x;
if(c == 0){
return 1;
}
if(c == '/'){
return 0;
}
x++;
}
}
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int main(int argc, char** argv){
char buff[FILENAME_MAX];
char* boot_file = get_option("-b", argc, argv);
if(boot_file){
argc -= 2;
}
else if(global_exe(argv[0])){
/* search path name */
char* path = getenv("PATH");
if(path == NULL){
fprintf(stderr, "unable to locate boot file\n");
exit(-1);
}
while(*path){
int len = copy_fst_path(buff, path);
char* x = buff + len;
x = stpcpy(x, "/");
x = stpcpy(x, argv[0]);
if(file_exists(buff)){
x = stpcpy(x, ".boot");
boot_file = buff;
path = "";
}
else {
if(path[len]){
path += (len+1);
} else {
fprintf(stderr, "unable to locate %s\n", argv[0]);
exit(-1);
}
}
}
}
else {
char* x = buff;
x = stpcpy(x, argv[0]);
x = stpcpy(x, ".boot");
boot_file = buff;
}
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if(sizeof(mp_limb_t) != sizeof(int)){
fprintf(stderr, "ERROR: limb size\n");
}
if(mp_bits_per_limb != (8*sizeof(int))){
fprintf(stderr, "ERROR: bits_per_limb=%d\n", mp_bits_per_limb);
}
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ikpcb* pcb = ik_make_pcb();
the_pcb = pcb;
{ /* set up arg_list */
ikp arg_list = null_object;
int i = argc-1;
while(i > 0){
char* s = argv[i];
int n = strlen(s);
ikp str = ik_alloc(pcb, align(n*string_char_size+disp_string_data+1))
+ string_tag;
ref(str, off_string_length) = fix(n);
{
int i;
for(i=0; i<n; i++){
string_set(str, i, integer_to_char(s[i]));
}
}
ikp p = ik_alloc(pcb, pair_size);
ref(p, disp_car) = str;
ref(p, disp_cdr) = arg_list;
arg_list = p+pair_tag;
i--;
}
pcb->arg_list = arg_list;
}
register_handlers();
register_alt_stack();
ik_fasl_load(pcb, boot_file);
/*
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fprintf(stderr, "collect time: %d.%03d utime, %d.%03d stime (%d collections)\n",
pcb->collect_utime.tv_sec,
pcb->collect_utime.tv_usec/1000,
pcb->collect_stime.tv_sec,
pcb->collect_stime.tv_usec/1000,
pcb->collection_id );
*/
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ik_delete_pcb(pcb);
return 0;
}
#if 0
#include <signal.h>
struct sigaction {
union {
void (*__sa_handler)(int);
void (*__sa_sigaction)(int, struct __siginfo *, void *);
} __sigaction_u; /* signal handler */
int sa_flags; /* see signal options below */
sigset_t sa_mask; /* signal mask to apply */
};
#define sa_handler __sigaction_u.__sa_handler
#define sa_sigaction __sigaction_u.__sa_sigaction
int
sigaction(int sig, const struct sigaction * restrict act,
struct sigaction * restrict oact);
#endif
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void handler(int signo, struct __siginfo* info, void* uap){
the_pcb->engine_counter = -1;
the_pcb->interrupted = 1;
}
void
register_handlers(){
struct sigaction sa;
sa.sa_sigaction = (void(*)(int,struct __siginfo*,void*)) handler;
sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
sa.sa_mask = 0;
int err = sigaction(SIGINT, &sa, 0);
if(err){
fprintf(stderr, "Sigaction Failed: %s\n", strerror(errno));
exit(-1);
}
}
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#if 0
SYNOPSIS
#include <sys/types.h>
#include <signal.h>
struct sigaltstack {
char *ss_sp;
int ss_size;
int ss_flags;
};
int
sigaltstack(const struct sigaltstack *ss, struct sigaltstack *oss);
#endif
void
register_alt_stack(){
char* stk = ik_mmap(SIGSTKSZ);
if(stk == 0){
fprintf(stderr, "Cannot maloc an alt stack\n");
exit(-1);
}
struct sigaltstack sa;
sa.ss_sp = stk;
sa.ss_size = SIGSTKSZ;
sa.ss_flags = 0;
int err = sigaltstack(&sa, 0);
if(err){
fprintf(stderr, "Cannot set alt stack: %s\n", strerror(errno));
exit(-1);
}
}