void assembler_destroy()
{
struct asm_context_t *ctx;
ctx = app.asmcontext;
if (!ctx)
return;
tokens_destroy(&ctx->tokens);
symbols_destroy(&ctx->symbols);
sections_destroy(&ctx->sections);
relocations_destroy(&ctx->relocations);
free(ctx);
app.asmcontext = NULL;
}
int main(int argc, char *argv[]) {
init_shell();
static char line[4096];
int line_num = 0;
/* Please only print shell prompts when standard input is not a tty */
if (shell_is_interactive)
fprintf(stdout, "%d: ", line_num);
int bg = 0;
while (fgets(line, 4096, stdin)) {
/* Split our line into words. */
struct tokens *tokens = tokenize(line);
/* Find which built-in function to run. */
int fundex = lookup(tokens_get_token(tokens, 0));
if (fundex >= 0) {
cmd_table[fundex].fun(tokens);
} else {
/* REPLACE this to run commands as programs. */
//Fork in order to account for redirecting
//If in background, ignore sigttou
signal(SIGTTOU, SIG_IGN);
pid_t child_pid = fork();
//check for background processing token
if (strcmp("&", tokens_get_token(tokens, tokens_get_length(tokens) - 1)) == 0)
{
bg = 1;
}
//Now set the child to have a new pgid
if (child_pid == 0)
{
setpgid(getpid(), getpid());
if (bg == 0) //push it into the foreground
{
tcsetpgrp(0, getpid());
}
run_program(tokens);
exit(2);
}
//If not background, wait for execution and set shell back to foreground
if (bg == 0)
{
int temp;
wait(&temp);
tcsetpgrp(0, getpid());
} else {
processes[num_processes] = child_pid;
num_processes += 1;
}
}
bg = 0;
if (shell_is_interactive)
/* Please only print shell prompts when standard input is not a tty */
fprintf(stdout, "%d: ", ++line_num);
/* Clean up memory */
tokens_destroy(tokens);
}
return 0;
}
