minishell/executor_utils3.c at master · yuchi1025/minishell · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   executor_utils3.c                                  :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: yucchen <yucchen@student.42singapore.sg    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/08 16:47:41 by yucchen           #+#    #+#             */
/*   Updated: 2026/01/09 14:54:29 by yucchen          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "parser.h"

static int	count_cmds(t_cmd *cmd)
{
	int	cnt;

	cnt = 0;
	while (cmd)
	{
		cnt++;
		cmd = cmd->next;
	}
	return (cnt);
}

int	pipex_init(t_pipex *pipex, t_cmd *cmd_list, t_env **env, char **envp)
{
	pipex->head = cmd_list;
	pipex->cur = cmd_list;
	pipex->env = env;
	pipex->envp = envp;
	pipex->cnt = count_cmds(cmd_list);
	pipex->pids = malloc(pipex->cnt * sizeof(pid_t));
	if (!pipex->pids)
		return (0);
	pipex->i = 0;
	pipex->prev_read = -1;
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	return (1);
}

int	pipex_open_pipe(t_pipex *pipex)
{
	if (pipex->is_last)
		return (1);
	if (pipe(pipex->pipefd) == -1)
	{
		if (pipex->prev_read != -1)
			close(pipex->prev_read);
		perror("pipe");
		free(pipex->pids);
		return (0);
	}
	return (1);
}

void	fork_fail(int is_last, int pipefd[2], int prev_read, pid_t *pids)
{
	if (!is_last)
	{
		close(pipefd[0]);
		close(pipefd[1]);
	}
	if (prev_read != -1)
		close(prev_read);
	perror("fork");
	free(pids);
}

void	child_process(t_pipex *pipex)
{
	free(pipex->pids);
	signal(SIGINT, SIG_DFL);
	signal(SIGQUIT, SIG_DFL);
	if (pipex->prev_read != -1)
	{
		if (dup2(pipex->prev_read, STDIN_FILENO) == -1)
		{
			perror("dup2 prev_read");
			child_cleanup(pipex->head, pipex->env, pipex->envp);
			exit(EXIT_FAILURE);
		}
		close(pipex->prev_read);
	}
	if (!pipex->is_last)
	{
		close(pipex->pipefd[0]);
		if (dup2(pipex->pipefd[1], STDOUT_FILENO) == -1)
		{
			perror("dup2 pipe write");
			child_cleanup(pipex->head, pipex->env, pipex->envp);
			exit(EXIT_FAILURE);
		}
		close(pipex->pipefd[1]);
	}
	exec_child_cmd(pipex->cur, pipex->env, pipex->envp, pipex->head);
}