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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* eval.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <me@cacharle.xyz> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/09/13 20:38:06 by charles #+# #+# */
/* Updated: 2020/09/16 16:29:20 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
int st_replace(int oldfd, int newfd)
{
if (oldfd != FD_NONE)
{
dup2(oldfd, newfd);
close(oldfd);
}
return 0;
}
/*
** \brief Wrap a function in a fork
** \param fds fork read/write file descriptors
** \param passed param of the wrapped function
** \param wrapped function to wrap
** \param child_pid Pointer where to store the child pid
** or NULL if the child should be waited
** \return The child status code or EVAL_FATAL on error
*/
int fork_wrap(
int fds[2], void *passed, t_wrapped_func wrapped, pid_t *child_pid, int fd_to_close
)
{
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 (st_replace(fds[FD_READ], STDIN_FILENO) != 0)
exit(EXIT_FAILURE);
if (st_replace(fds[FD_WRITE], STDOUT_FILENO) != 0)
exit(EXIT_FAILURE);
if (fd_to_close != FD_NONE)
close(fd_to_close);
if ((status = wrapped(passed)) == EVAL_FATAL)
exit(EXIT_FAILURE);
exit(status);
}
g_child_pid = *child_pid;
if (waiting)
{
waitpid(*child_pid, child_pid, 0);
close(fds[FD_WRITE]);
return (WEXITSTATUS(*child_pid));
}
return (0);
}
/*
** \brief Evaluate and AST
** \return The last command status or EVAL_FATAL on error
*/
int eval(int fds[2], t_env env, t_ast *ast, pid_t *child_pid, int fd_to_close)
{
if (ast->tag == AST_PARENT)
return (eval_parenthesis(fds, env, ast, child_pid, fd_to_close));
if (ast->tag == AST_OP)
return (eval_operation(fds, env, ast));
if (ast->tag == AST_CMD)
return (eval_cmd(fds, env, ast, child_pid, fd_to_close));
return (EVAL_FATAL);
}
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