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here_document_pipe.c
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here_document_pipe.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* here_document_pipe.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: jkong <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2022/06/15 19:01:17 by jkong #+# #+# */
/* Updated: 2022/06/28 02:39:19 by jkong ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
#include "string_buffer.h"
#include "safe_io.h"
#include "libft.h"
#include <unistd.h>
#include <sys/wait.h>
static void _write_document_pipe_internal(int fildes[2], char *eof, t_shell *sh)
{
char *str;
set_signal_handler(2);
close(fildes[STDIN_FILENO]);
str = read_document(eof, sh);
write_safe(fildes[STDOUT_FILENO], str, ft_strlen(str));
free(str);
close(fildes[STDOUT_FILENO]);
}
static char *_read_document_pipe_internal(int fd, char *str, size_t len)
{
t_str_buf *buf;
ssize_t size;
buf = NULL;
while (1)
{
size = read(fd, str, len);
if (size < 0)
{
free(str_dispose(buf));
return (NULL);
}
else if (size == 0)
break ;
buf = str_append_raw(buf, str, size);
}
return (str_dispose(buf));
}
static char *_wait_document_pipe_internal(int fildes[2], pid_t pid)
{
const size_t len = GROW_THRESHOLD;
char *buf;
char *str;
int status;
pid_t got_pid;
set_signal_handler(0);
close(fildes[STDOUT_FILENO]);
buf = malloc_safe(len);
str = _read_document_pipe_internal(fildes[STDIN_FILENO], buf, len);
close(fildes[STDIN_FILENO]);
free(buf);
got_pid = waitpid(pid, &status, 0);
if (got_pid < 0)
exit_fail("waitpid");
if (WIFSIGNALED(status))
on_signal();
set_signal_handler(1);
g_exit_status = get_exit_status(status);
return (str);
}
char *read_document_pipe(char *eof, t_shell *sh)
{
int fildes[2];
pid_t pid;
if (pipe(fildes) < 0)
exit_fail("pipe error");
pid = fork();
if (pid < 0)
exit_fail("fork");
else if (pid == 0)
{
_write_document_pipe_internal(fildes, eof, sh);
exit(EXIT_SUCCESS);
}
return (_wait_document_pipe_internal(fildes, pid));
}