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ft_pipex.c
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ft_pipex.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_pipex.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: youkim <youkim@student.42seoul.kr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/08/11 19:34:22 by youkim #+# #+# */
/* Updated: 2021/08/11 19:34:22 by youkim ### ########.fr */
/* */
/* ************************************************************************** */
#include "ft_pipex.h"
#include <stdio.h>
void ft_pipein(t_info *info, int pipefd[2])
{
close(pipefd[PIPE_READ]);
if (dup2(pipefd[PIPE_WRITE], STDOUT_FILENO) == ERROR)
ft_error("while connecting pipe write END with STDOUT_FILENO");
if (dup2(info->infd, STDIN_FILENO) == ERROR)
ft_error("while connecting infile fd with STDIN_FILENO");
ft_exec(info, 0);
close(info->infd);
close(pipefd[PIPE_WRITE]);
}
void ft_pipeout(t_info *info, int pipefd[2])
{
close(pipefd[PIPE_WRITE]);
dup2(info->outfd, STDOUT_FILENO);
dup2(pipefd[PIPE_READ], STDIN_FILENO);
ft_exec(info, 1);
close(info->outfd);
close(pipefd[PIPE_READ]);
wait(CHILD);
}
void ft_pipex(int argc, char **argv, char **envp)
{
int pipefd[2];
t_info info;
if (argc != 5)
ft_error("to use: ./pipex inflie cmd1 cmd2 outfile");
info.envp = envp;
info.infd = open(argv[1], O_RDONLY);
if (info.infd == ERROR)
ft_error("while opening input file");
info.outfd = open(argv[4], O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (info.outfd == ERROR)
ft_error("while opening output file");
if (pipe(pipefd) == ERROR)
ft_error("while creating pipe");
info.pid = fork();
if (info.pid == ERROR)
ft_error("while forking process");
info.argslst[0] = ft_qsplit(argv[2], ' ');
info.argslst[1] = ft_qsplit(argv[3], ' ');
if (info.pid == CHILD)
ft_pipein(&info, pipefd);
else
ft_pipeout(&info, pipefd);
}