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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_pipes_next.h"
#include "f_fail.h"
#include "s_lpipes.h"
#include "s_struct.h"
#include "u_utils.h"
#include "u_path.h"
/*
** TODO: handle fork() failed, etc
*/
static int32_t e_unroll_pipes(int32_t fd[256][2],
char *fullpath[],
size_t pipes,
t_msh *msh)
{
struct s_lpipes *head;
int32_t pid;
uint16_t i;
head = msh->pipes;
i = 0;
while (i <= pipes && i < 255)
{
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);
e_close_unused_fds(fd, pipes);
e_pipe_child(fullpath, i, head->com, msh);
}
head = head->next;
i++;
}
return (pid);
}
/*
** TODO: error mgmnt
*/
static void e_pipe_exec_path(char *fullpath[],
size_t pipes,
t_msh *msh)
{
int32_t fd[256][2];
int32_t pid;
int32_t status;
uint16_t i;
i = 0;
while (i < pipes && i < 255)
{
pipe(fd[i]);
i++;
}
pid = e_unroll_pipes(fd, fullpath, pipes, msh);
i = 0;
while (i < pipes && i < 255)
{
close(fd[i][E_WRITE_END]);
close(fd[i][E_READ_END]);
i++;
}
waitpid(pid, &status, 0);
msh->ret = WEXITSTATUS(status);
}
/* static void e_fullpath_not_found(t_com *ptr, t_msh *msh) */
/* { */
/* f_command_not_found(ptr->bin); */
/* u_eof_fd(msh->fd); */
/* s_com_destroy(&msh->com); */
/* s_line_clear(&msh->curr); */
/* s_destroy(msh); */
/* exit(127); */
/* } */
static char *e_get_current_path(struct s_lpipes *rptr, t_msh *msh)
{
char tmp[PATH_MAX];
char *path;
uint8_t fp_ret;
path = NULL;
if (rptr->com->bin != NULL && ft_ischarset("/.", rptr->com->bin[0]) == TRUE)
{
if ((path = ft_strdup(rptr->com->bin)) == NULL)
f_alloc_and_destroy_msh(msh);
}
else
{
if (u_get_builtin_id(rptr->com->bin) < B_BUILTINS_COUNT)
{
if ((path = ft_strdup("builtin")) == NULL)
f_alloc_and_destroy_msh(msh);
}
else
{
fp_ret = u_search_in_path(tmp, rptr->com->bin, PATH_MAX, msh);
if ((path = ft_strdup(tmp)) == NULL)
f_alloc_and_destroy_msh(msh);
}
}
return (path);
}
static char **e_get_fullpath(size_t pipes, t_msh *msh)
{
struct s_lpipes *rptr;
char **fullpath;
size_t i;
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)
{
fullpath[i] = e_get_current_path(rptr, msh);
i++;
rptr = rptr->next;
}
return (fullpath);
}
void e_pipes(t_msh *msh)
{
const size_t pipes = e_get_pipes_count(msh->pipes);
fullpath = e_get_fullpath(pipes, msh);
e_pipe_exec_path(fullpath, pipes, msh);
ft_delwords(fullpath);
s_lpipes_clear(&msh->pipes);
}
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