122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* executor.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: sede-san <sede-san@student.42madrid.com +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/10/28 13:03:44 by sede-san #+# #+# */
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/* Updated: 2025/12/01 13:51:37 by sede-san ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "executor.h"
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static char *solve_path(char *cmd_name, t_minishell *msh);
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static u_int8_t path_is_solved(char *cmd_name);
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static void handle_child(t_command *cmd, t_minishell *msh);
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static void handle_parent(pid_t child_pid, t_command *cmd, t_minishell *msh);
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u_int8_t execute(
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t_command cmd,
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t_minishell *msh
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){
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pid_t child_pid;
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cmd.path = solve_path(cmd.argv[0], msh);
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if (!cmd.path)
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{
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// command not found
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ft_eprintf("minishell: %s: command not found\n", cmd.argv[0]);
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return (msh->exit_status = 127, msh->exit_status);
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}
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if (access(cmd.path, X_OK) != EXIT_SUCCESS)
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{
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// permission denied
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ft_eputstr("minishell: ");
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perror(cmd.path);
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return (msh->exit_status = 126, msh->exit_status);
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}
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child_pid = fork();
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if (child_pid == -1)
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perror("minishell");
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else if (child_pid == 0)
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handle_child(&cmd, msh);
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else
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handle_parent(child_pid, &cmd, msh);
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return (msh->exit_status);
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}
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static char *solve_path(
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char *cmd_name,
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t_minishell *msh
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){
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char *cmd_path;
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char **path;
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size_t i;
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if (path_is_solved(cmd_name))
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// return a copy to avoid double free on parent
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return (ft_strdup(cmd_name));
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path = ft_split(get_env("PATH", msh), COLON);
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if (!path)
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return (NULL);
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cmd_path = NULL;
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i = -1;
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while (!cmd_path && path[++i])
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{
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cmd_path = ft_strnjoin(3, path[i], "/", cmd_name);
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if (!cmd_path)
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return (NULL);
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/**
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* If a command exists but user has no execution permission
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* the command is shown as non existant instead of showing the
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* last ocurrence found
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*
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* TLDR: bash shows 'Permission denied'
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* and minishell 'command not found'
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*
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* TEST: execute an existing command without permission to do so
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*/
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if (access(cmd_path, X_OK) != EXIT_SUCCESS)
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ft_free((void **)&cmd_path);
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}
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ft_free_split((char **)path);
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if (!cmd_path)
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return (NULL);
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return (cmd_path);
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}
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static u_int8_t path_is_solved(
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char *cmd_name
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){
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return (ft_strncmp(cmd_name, "/", 1) == 0
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|| (cmd_name[1] && ft_strncmp(cmd_name, "./", 2) == 0)
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|| (cmd_name[2] && ft_strncmp(cmd_name, "../", 3) == 0)
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);
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}
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static void handle_child(
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t_command *cmd,
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t_minishell *msh
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){
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execve(cmd->path, cmd->argv, msh->variables.environment);
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}
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static void handle_parent(
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pid_t child_pid,
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t_command *cmd,
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t_minishell *msh
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){
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if (waitpid(child_pid, (int *)&msh->exit_status, 0) == EXIT_SUCCESS)
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{
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// handle success
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}
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else
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{
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// handle error
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}
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ft_free((void **)&cmd->path);
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ft_free_split(cmd->argv);
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}
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