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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* cmd.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/14 10:41:31 by charles #+# #+# */
/* Updated: 2020/09/13 14:19:37 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
pid_t g_child_pid = -1;
int g_last_status = 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),
pid_t *child_pid
)
{
int status;
bool waiting;
pid_t pid;
waiting = child_pid == NULL;
if (waiting)
child_pid = &pid;
if ((*child_pid = fork()) == -1)
return (EVAL_FATAL);
if (*child_pid == 0)
{
if ((fds[FD_READ] != FD_NONE && dup2(fds[FD_READ], STDIN_FILENO) == -1) ||
(fds[FD_WRITE] != FD_NONE && dup2(fds[FD_WRITE], STDOUT_FILENO) == -1))
exit(EXIT_FAILURE);
if ((status = wrapped(passed)) == EVAL_FATAL) // FIXME detect fatal in child (pipe ?)
exit(EXIT_FAILURE);
exit(status);
}
g_child_pid = *child_pid;
if (waiting)
{
waitpid(*child_pid, child_pid, 0);
close(fds[FD_WRITE]);
/* close(fds[FD_READ]); */
return (WEXITSTATUS(*child_pid));
}
return (0);
}
int forked_cmd(void *void_param)
{
t_fork_param_cmd *param;
int status;
struct stat statbuf;
param = void_param;
if (param->builtin != NULL)
return (param->builtin->func(param->argv, param->env));
else
{
if (stat(param->exec_path, &statbuf) == -1)
return (errorf_ret(126, "%s: %s\n", param->exec_path, strerror(errno)));
if (S_ISDIR(statbuf.st_mode))
return (errorf_ret(126, "%s: Is a directory\n", param->exec_path));
if (!(statbuf.st_mode & 0444))
return (errorf_ret(126, "%s: %s\n", param->exec_path, strerror(EACCES)));
errno = 0;
status = execve(param->exec_path, param->argv, (char**)param->env->data);
if (status == -1)
{
if (errno == ENOEXEC)
return (0);
return (errorf_ret(126, "%s: %s\n", param->exec_path, strerror(errno)));
}
return (status);
}
}
int eval_cmd(int fds[2], t_env env, t_path path, t_ast *ast, pid_t *child_pid)
{
t_fork_param_cmd param;
char **argv;
int status;
if ((status = redir_extract(&ast->redirs, env, fds)) != 0)
return (status);
if ((argv = preprocess(&ast->cmd_argv, env)) == NULL)
{
ast->cmd_argv = NULL;
return (EVAL_FATAL);
}
if (argv[0] == NULL)
return (0);
param.builtin = builtin_search_func(argv[0]);
if (param.builtin == NULL)
{
param.exec_path = exec_search_path(path, env_search(env, "PATH"), argv[0]);
if (param.exec_path == NULL)
{
errorf("%s: command not found\n", argv[0]);
ft_split_destroy(argv);
return (127);
}
}
else if (!param.builtin->forked && child_pid == NULL)
return (param.builtin->func(argv, env));
param.argv = argv;
param.env = env;
status = fork_wrap(fds, ¶m, &forked_cmd, child_pid);
ft_split_destroy(argv);
g_last_status = status;
return (status);
}
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