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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* op.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/17 15:27:22 by charles #+# #+# */
/* Updated: 2020/09/13 14:22:45 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
int eval_op(int fds[2], t_env env, t_path path, t_ast *ast)
{
int status;
int left_fds[2];
int right_fds[2];
int p[2];
left_fds[FD_READ] = fds[FD_READ];
left_fds[FD_WRITE] = FD_NONE;
right_fds[FD_READ] = FD_NONE;
right_fds[FD_WRITE] = fds[FD_WRITE];
if (ast->op.sep == TAG_PIPE)
{
pipe(p);
left_fds[FD_WRITE] = p[FD_WRITE];
right_fds[FD_READ] = p[FD_READ];
pid_t left_pid;
pid_t right_pid;
eval(left_fds, env, path, ast->op.left, &left_pid);
close(p[FD_WRITE]);
eval(right_fds, env, path, ast->op.right, &right_pid);
close(p[FD_READ]);
pid_t finished;
finished = wait(NULL);
if (finished == left_pid)
{
waitpid(right_pid, &right_pid, 0);
}
else if (finished == right_pid)
{
kill(left_pid, SIGKILL);
/* waitpid(left_pid, &left_pid, 0); */
}
return (0);
}
if ((status = eval(left_fds, env, path, ast->op.left, NULL)) == EVAL_FATAL)
return (EVAL_FATAL);
g_last_status = status;
if ((ast->op.sep == TAG_AND && status != 0) ||
(ast->op.sep == TAG_PIPE && status != 0) ||
(ast->op.sep == TAG_OR && status == 0))
return (status);
return (eval(right_fds, env, path, ast->op.right, NULL));
}
int wrapped_eval(void *void_param)
{
t_fork_param_args *param;
param = void_param;
return (eval(param->fds, param->env, param->path, param->ast, NULL));
}
int eval_parent(int fds[2], t_env env, t_path path, t_ast *ast)
{
int status;
if ((status = redir_extract(&ast->redirs, env, fds)) != 0)
return (status);
ast->tag ^= AST_PARENT;
return (eval_forked(fds, env, path, ast->parent_ast, NULL));
}
int eval_forked(int fds[2], t_env env, t_path path, t_ast *ast, pid_t *child_pid)
{
t_fork_param_args param;
param.fds[0] = fds[0];
param.fds[1] = fds[1];
param.env = env;
param.path = path;
param.ast = ast;
return (fork_wrap(fds, ¶m, wrapped_eval, child_pid));
}
int eval(int fds[2], t_env env, t_path path, t_ast *ast, pid_t *child_pid)
{
if (ast->tag == AST_PARENT)
return (eval_parent(fds, env, path, ast));
if (ast->tag == AST_OP)
return (eval_op(fds, env, path, ast));
if (ast->tag == AST_CMD)
return (eval_cmd(fds, env, path, ast, child_pid));
return (EVAL_FATAL);
}
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