executor_utils.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   executor_utils.c                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hgenc <hgenc@student.42kocaeli.com.tr>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/26 17:40:01 by hgenc             #+#    #+#             */
/*   Updated: 2026/02/03 16:15:00 by hgenc            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "../../include/minishell.h"
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
 
/**
 * @brief Child process'i bekle ve exit status al
 * EINTR: sinyal gelirse waitpid'i tekrar dene (zombie bırakma)
 */
int wait_for_child(pid_t pid)
{
    int     status;
    pid_t   ret;
 
    if (pid < 0)
        return (1);
    while (1)
    {
        ret = waitpid(pid, &status, 0);
        if (ret > 0)
            break ;
        if (ret < 0 && errno != EINTR)
            return (1);
    }
    if (WIFEXITED(status))
        return (WEXITSTATUS(status));
    if (WIFSIGNALED(status))
        return (128 + WTERMSIG(status));
    return (1);
}
 
/**
 * @brief stdin ve stdout'u kaydet (builtin için)
 * @param saved_fds 2 elemanlı array
 * @return int başarı: 1, hata: 0
 */
int save_std_fds(int *saved_fds)
{
    if (!saved_fds)
        return (0);
    saved_fds[0] = dup(STDIN_FILENO);
    if (saved_fds[0] < 0)
        return (0);
    saved_fds[1] = dup(STDOUT_FILENO);
    if (saved_fds[1] < 0)
    {
        close(saved_fds[0]);
        return (0);
    }
    return (1);
}
 
/**
 * @brief Kaydedilen fd'leri geri yükle
 * @param saved_fds 2 elemanlı array
 * @return int başarı: 1, hata: 0
 */
int restore_std_fds(int *saved_fds)
{
    int ret;
 
    ret = 1;
    if (!saved_fds)
        return (0);
    if (saved_fds[0] >= 0)
    {
        if (dup2(saved_fds[0], STDIN_FILENO) < 0)
            ret = 0;
        close(saved_fds[0]);
    }
    if (saved_fds[1] >= 0)
    {
        if (dup2(saved_fds[1], STDOUT_FILENO) < 0)
            ret = 0;
        close(saved_fds[1]);
    }
    return (ret);
}