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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* interpreter.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dkaiser <dkaiser@student.42heilbronn.de +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/08/05 13:15:24 by dkaiser #+# #+# */
/* Updated: 2024/10/25 13:25:33 by dkaiser ### ########.fr */
/* */
/* ************************************************************************** */
#include "debug_tools.h"
#include "minishell.h"
#include <stdlib.h>
#include <sys/_types/_pid_t.h>
#include <sys/cdefs.h>
#include <sys/wait.h>
#include <unistd.h>
static int eval_rec(t_node *node, t_env *env, int in_fd);
int eval(t_node *node, t_env *env)
{
pid_t pid;
int result;
if (node == NULL)
return (EXIT_FAILURE);
result = 0;
pid = fork();
if (pid < 0)
{
return (EXIT_FAILURE);
}
if (pid == 0)
{
result = eval_rec(node, env, STDIN_FILENO);
exit(result);
}
else
{
waitpid(pid, &result, 0);
}
return (result);
}
static int eval_rec(t_node *node, t_env *env, int in_fd)
{
pid_t pid;
int result;
int p[2];
result = pipe(p);
if (result == -1)
return (EXIT_FAILURE);
if (node->type == PIPE_NODE)
{
pid = fork();
if (pid < 0)
{
return (EXIT_FAILURE);
}
if (pid == 0)
{
close(p[0]);
dup2(in_fd, STDIN_FILENO);
dup2(p[1], STDOUT_FILENO);
result = execute_cmd(&node->content.pipe.left->content.cmd, env);
exit(result);
}
else
{
close(p[1]);
dup2(p[0], STDIN_FILENO);
result = eval_rec(node->content.pipe.right, env, p[0]);
}
}
else if (node->type == CMD_NODE)
{
result = execute_cmd(&node->content.cmd, env);
}
else
{
panic(UNREACHABLE);
return (EXIT_FAILURE);
}
return (result);
}
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