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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>
#ifdef __linux__
# include <linux/limits.h>
#else
# include <limits.h>
#endif
#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"
static uint8_t e_get_current_path(char fullpath[],
struct s_lpipes *ptr,
t_msh *msh)
{
uint8_t fp_ret;
fp_ret = 0;
if (ptr->com->bin != NULL && ft_ischarset("/.", ptr->com->bin[0]) == TRUE)
{
ft_strlcpy(fullpath, ptr->com->bin, PATH_MAX);
}
else if (ptr->com->bin != NULL)
{
if (u_get_builtin_id(ptr->com->bin) < B_BUILTINS_COUNT)
{
ft_strlcpy(fullpath, "builtin", 8);
}
else
{
fp_ret = u_search_in_path(fullpath, ptr->com->bin, PATH_MAX, msh);
}
}
return (fp_ret);
}
/*
** TODO: handle fork() failed, etc
*/
static int32_t e_unroll_pipes(int32_t fd[256][2],
size_t pipes,
t_msh *msh)
{
struct s_lpipes *head;
char fullpath[PATH_MAX];
int32_t pid;
uint16_t i;
uint8_t fp_ret;
head = msh->pipes;
i = 0;
while (i <= pipes && i < 255)
{
fp_ret = e_get_current_path(fullpath, head, msh);
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, fp_ret, head->com, msh);
}
head = head->next;
i++;
}
return (pid);
}
/*
** TODO: error mgmnt
*/
static void e_pipe_exec(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, 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);
}
void e_pipes(t_msh *msh)
{
const size_t pipes = e_get_pipes_count(msh->pipes);
e_pipe_exec(pipes, msh);
s_lpipes_clear(&msh->pipes);
}
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