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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* e_pipes.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: rbousset <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/14 17:19:27 by rbousset #+# #+# */
/* Updated: 2020/02/14 17:19:29 by rbousset ### ########lyon.fr */
/* */
/* ************************************************************************** */
#include <sys/wait.h>
#include <libft.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include "e_builtins.h"
#include "e_redirs.h"
#include "f_fail.h"
#include "s_destroy.h"
#include "s_line.h"
#include "s_lpipes.h"
#include "s_struct.h"
#include "u_utils.h"
#include "u_path.h"
/*
** TODO: handle execve failed
*/
static void e_pipe_child(char *fullpath[],
uint8_t pipe_id,
t_com *ptr,
t_msh *msh)
{
uint8_t bu_id;
uint8_t ret;
e_dup_redirs(ptr, msh);
if (ft_strncmp(fullpath[pipe_id], "builtin", 8) == 0)
{
bu_id = u_get_builtin_id(ptr->bin);
ret = msh->bu_ptr[bu_id](ptr->argv + 1, msh);
u_eof_fd(msh->fd);
s_lpipes_clear(&msh->pipes);
s_line_clear(&msh->curr);
s_destroy(msh);
ft_delwords(fullpath);
exit(ret);
}
else
execve(fullpath[pipe_id], ptr->argv, msh->envp);
}
static size_t e_get_pipes_count(struct s_lpipes *ptr)
{
struct s_lpipes *rptr;
size_t pipes;
rptr = ptr;
pipes = 0;
while (rptr->next != NULL)
{
rptr = rptr->next;
pipes++;
}
return (pipes);
}
/*
** TODO: error mgmnt
*/
static void e_pipe_exec_path(char *fullpath[], struct s_lpipes *head, t_msh *msh)
{
int fd[256][2];
size_t pipes;
size_t i;
size_t j;
int pid;
int status;
pipes = e_get_pipes_count(head);
i = 0;
while (i < pipes)
{
pipe(fd[i]);
i++;
}
i = 0;
while (i <= pipes)
{
if ((pid = fork()) == 0)
{
if (i != 0)
dup2(fd[i - 1][E_WRITE_END], STDIN_FILENO);
if (i != pipes)
dup2(fd[i][E_READ_END], STDOUT_FILENO);
j = 0;
while (j < pipes)
{
close(fd[j][E_WRITE_END]);
close(fd[j][E_READ_END]);
j++;
}
e_pipe_child(fullpath, i, head->com, msh);
}
head = head->next;
i++;
}
i = 0;
while (i < pipes)
{
close(fd[i][E_WRITE_END]);
close(fd[i][E_READ_END]);
i++;
}
waitpid(pid, &status, 0);
msh->ret = WEXITSTATUS(status);
}
static char **e_get_fullpath(size_t pipes, t_msh *msh)
{
struct s_lpipes *rptr;
char tmp[PATH_MAX];
char **fullpath;
size_t i;
uint8_t bu_id;
rptr = msh->pipes;
if ((fullpath = (char **)malloc((pipes + 2) * sizeof(char *))) == NULL)
f_alloc_and_destroy_msh(msh);
fullpath[pipes + 1] = NULL;
i = 0;
while (rptr != NULL)
{
if (ft_ischarset("/.", rptr->com->bin[0]) == TRUE)
{
if ((fullpath[i] = ft_strdup(rptr->com->bin)) == NULL)
f_alloc_and_destroy_msh(msh);
}
else
{
if ((bu_id = u_get_builtin_id(rptr->com->bin))
< B_BUILTINS_COUNT)
{
if ((fullpath[i] = ft_strdup("builtin")) == NULL)
f_alloc_and_destroy_msh(msh);
}
else
{
u_search_in_path(tmp, rptr->com->bin, PATH_MAX, msh);
fullpath[i] = ft_strdup(tmp);
}
}
i++;
rptr = rptr->next;
}
return (fullpath);
}
void e_pipes(t_msh *msh)
{
char **fullpath;
fullpath = e_get_fullpath(e_get_pipes_count(msh->pipes), msh);
e_pipe_exec_path(fullpath, msh->pipes, msh);
ft_delwords(fullpath);
s_lpipes_clear(&msh->pipes);
}
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