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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* cmd.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/14 10:41:31 by charles #+# #+# */
/* Updated: 2020/07/20 14:53:40 by nahaddac ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
pid_t g_child_pid = -1;
int g_last_status_code = 0;
void token_debug(void *v);
/*
** \brief Wrap a function in a fork
** \param fd_in fork input file descriptor
** \param fd_out fork output file descriptor
** \param passed param of the wrapped function
** \param wrapped function to wrap
*/
int fork_wrap(
int fds[2],
void *passed,
int (*wrapped)(void *param))
{
int status;
pid_t child_pid;
if ((child_pid = fork()) == -1)
return (-1);
if (child_pid == 0)
{
if ((fds[FDS_READ] != MS_NO_FD && dup2(fds[FDS_READ], STDIN_FILENO) == -1) ||
(fds[FDS_WRITE] != MS_NO_FD && dup2(fds[FDS_WRITE], STDOUT_FILENO) == -1))
exit(EXIT_FAILURE);
if ((status = wrapped(passed)) == -1)
exit(EXIT_FAILURE);
exit(status);
}
g_child_pid = child_pid;
wait(&child_pid);
close(fds[FDS_WRITE]);
// also read end?
return (WEXITSTATUS(child_pid));
}
int forked_cmd(void *void_param)
{
t_fork_param_cmd *param;
int ret;
param = void_param;
ft_vecpop(param->env_local, NULL);
if (ft_vecswallow_at(param->env, param->env->size - 1, param->env_local) == NULL)
{
ft_vecdestroy(param->env_local, free);
return (-1);
}
if (param->builtin != NULL)
return (param->builtin->func(param->argv, param->env));
else
{
errno = 0;
ret = execve(param->exec_path, param->argv, (char**)param->env->data);
if (ret == -1)
{
if (errno == ENOEXEC)
return (0);
struct stat statbuf;
if (stat(param->exec_path, &statbuf) != -1 && S_ISDIR(statbuf.st_mode))
{
errorf("%s: Is a directory\n", param->exec_path);
ret = 126;
}
else
{
errorf("%s: %s\n", param->exec_path, strerror(errno));
ret = 126;
}
}
return (ret);
}
}
int eval_cmd(int fds[2], t_env env, t_path path, t_ast *ast)
{
t_fork_param_cmd param;
char **argv;
char *id;
t_ftlst *tmp;
if (!redir_extract(ast->redirs, env, fds))
{
ast->redirs = NULL;
return (-1);
}
ast->redirs = NULL;
if ((param.env_local = env_from_array((char*[]){NULL})) == NULL)
return (-1);
// TODO generate token list after `=` for variable value preprocessing
while (ast->cmd_argv != NULL
&& ((t_token*)ast->cmd_argv->data)->tag & TAG_IS_STR
&& utils_start_with_valid_identifier(((t_token*)ast->cmd_argv->data)->content))
{
id = ((t_token*)ast->cmd_argv->data)->content;
*ft_strchr(id, '=') = '\0';
((t_token*)ast->cmd_argv->data)->content = ft_strchr(id, '\0') + 1;
tmp = split_token(&ast->cmd_argv, TAG_STICK);
preprocess(tmp, env);
ft_lstiter(tmp, token_debug);
if (env_export(param.env_local,id, ((t_token*)ast->cmd_argv->data)->content) == NULL)
return (-1);
ft_lstpop_front(&ast->cmd_argv, (void (*)(void*))token_destroy);
}
if (ast->cmd_argv == NULL) // FIXME special env not passed to child processes
{
ft_vecpop(param.env_local, NULL);
if (ft_vecswallow_at(env, env->size - 1, param.env_local) == NULL)
{
ft_vecdestroy(param.env_local, free);
return (-1);
}
g_last_status_code = 0;
return (0);
}
if ((argv = preprocess(&ast->cmd_argv, env)) == NULL)
{
ast->cmd_argv = NULL;
return (-1);
}
// can have no command (e.g `< file`)
if (argv[0] == NULL)
return (0);
param.builtin = builtin_search_func(argv[0]);
if (param.builtin == NULL)
{
// check env local for PATH
param.exec_path = exec_search_path(path, env_search(env, "PATH"), argv[0]);
if (param.exec_path == NULL)
{
g_last_status_code = 127;
errorf("%s: command not found\n", argv[0]);
ft_split_destroy(argv);
return (-1); // return error status
}
}
else if (!param.builtin->forked)
{
g_last_status_code = param.builtin->func(argv, env);
return (g_last_status_code);
}
param.argv = argv;
param.env = env;
int ret = fork_wrap(fds, ¶m, &forked_cmd);
g_last_status_code = ret;
ft_split_destroy(argv);
ft_vecdestroy(param.env_local, free);
return (ret);
}
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