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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* operation.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/17 15:27:22 by charles #+# #+# */
/* Updated: 2020/10/09 16:12:14 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
int eval_operation(int fds[2], t_env env, t_ast *ast)
{
int status;
int left_fds[2];
int right_fds[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 ((status = eval(left_fds, env, ast->op.left)) == EVAL_FATAL)
return (EVAL_FATAL);
g_state.last_status = status;
if (g_state.killed)
return (status);
if ((ast->op.sep == TAG_AND && status != 0) ||
(ast->op.sep == TAG_OR && status == 0))
return (status);
return (eval(right_fds, env, ast->op.right));
}
#define PIPES_PREV_OUTPUT 2
static int st_run_piped(
t_env env, t_ast *ast, int pipes[3], bool is_last)
{
pid_t pid;
int fds[2];
if ((pid = fork()) == -1)
return (EVAL_FATAL);
if (pid == 0)
{
g_state.is_child = true;
if (!is_last)
dup2(pipes[FD_WRITE], STDOUT_FILENO);
if (pipes[PIPES_PREV_OUTPUT] != STDIN_FILENO)
{
dup2(pipes[PIPES_PREV_OUTPUT], STDIN_FILENO);
close(pipes[PIPES_PREV_OUTPUT]);
}
if (!is_last)
close(pipes[FD_READ]);
fds[0] = FD_NONE;
fds[1] = FD_NONE;
exit(eval(fds, env, ast));
}
return (pid);
}
int eval_pipeline(t_env env, t_ast *ast)
{
t_ftlst *curr;
int pipes[3];
int pid;
pipes[PIPES_PREV_OUTPUT] = STDIN_FILENO;
curr = ast->pipeline;
while (curr->next != NULL)
{
pipe(pipes);
st_run_piped(env, curr->data, pipes, false);
close(pipes[FD_WRITE]);
if (pipes[PIPES_PREV_OUTPUT] != STDIN_FILENO)
close(pipes[PIPES_PREV_OUTPUT]);
pipes[PIPES_PREV_OUTPUT] = pipes[FD_READ];
curr = curr->next;
}
pid = st_run_piped(env, curr->data, pipes, true);
g_child_pid = pid;
close(pipes[FD_READ]);
waitpid(pid, &pid, 0);
while (wait(NULL) != -1)
;
return (WEXITSTATUS(pid));
}
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