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@@ -1,460 +0,0 @@
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-/* Run program with its first three file descriptors attached to a tty.
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-
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- Copyright 2014, 2016 Free Software Foundation, Inc.
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-
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- This file is part of GNU tar.
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-
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- GNU tar is free software; you can redistribute it and/or modify
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- it under the terms of the GNU General Public License as published by
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- the Free Software Foundation; either version 3 of the License, or
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- (at your option) any later version.
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-
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- GNU tar is distributed in the hope that it will be useful,
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- but WITHOUT ANY WARRANTY; without even the implied warranty of
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- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- GNU General Public License for more details.
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-
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- You should have received a copy of the GNU General Public License
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- along with this program. If not, see <http://www.gnu.org/licenses/>.
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-*/
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-#define _XOPEN_SOURCE 600
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-#include <config.h>
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-#include <stdio.h>
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-#include <stdlib.h>
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-#include <sys/time.h>
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-#include <sys/types.h>
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-#include <sys/stat.h>
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-#include <sys/wait.h>
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-#include <unistd.h>
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-#include <fcntl.h>
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-#include <errno.h>
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-#include <signal.h>
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-#include <string.h>
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-#include <sys/socket.h>
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-#include <sys/select.h>
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-#include <termios.h>
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-#include <sys/ioctl.h>
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-
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-#ifndef TCSASOFT
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-# define TCSASOFT 0
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-#endif
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-
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-#define C_EOT 4
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-
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-#define EX_OK 0
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-#define EX_USAGE 125
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-#define EX_ERR 126
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-#define EX_EXEC 127
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-
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-#define BUF_SIZE 1024
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-
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-#if 0
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-# define DEBUG(c) fprintf (stderr, "%s\n", c)
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-#else
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-# define DEBUG(c)
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-#endif
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-
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-struct buffer
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-{
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- char buf[BUF_SIZE];
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- int avail;
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- int written;
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- int cr;
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- time_t ts;
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-};
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-
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-#define shut(fildes) \
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- do \
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- { \
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- DEBUG (("closing " #fildes)); \
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- close(fildes); \
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- fildes = -1; \
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- } \
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- while(0)
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-
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-#define bufinit(buffer,all) \
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- do \
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- { \
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- (buffer).avail = (buffer).written = 0; \
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- (buffer).ts = time (NULL); \
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- if (all) \
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- (buffer).cr = 0; \
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- } \
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- while(0)
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-
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-#define bufisempty(buffer) ((buffer).avail == (buffer).written)
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-#define bufavail(buffer) (BUF_SIZE - (buffer).avail)
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-
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-#define bufread(buffer,fildes,tty) \
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- do \
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- { \
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- int r = read (fildes, (buffer).buf + (buffer).avail, \
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- BUF_SIZE - (buffer).avail); \
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- (buffer).ts = time (NULL); \
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- if (r < 0) \
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- { \
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- if (errno == EINTR) \
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- continue; \
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- if (tty && errno == EIO) \
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- shut (fildes); \
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- else \
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- { \
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- fprintf (stderr, "%s:%d: reading from %s: %s", \
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- __FILE__,__LINE__,#fildes, strerror (errno)); \
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- exit (EX_ERR); \
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- } \
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- } \
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- else if (r == 0) \
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- shut (fildes); \
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- else \
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- (buffer).avail += r; \
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- } \
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- while(0)
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-
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-#define bufwrite(buffer,fildes) \
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- do \
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- { \
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- int r = write (fildes, (buffer).buf + (buffer).written, \
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- (buffer).avail - (buffer).written); \
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- (buffer).ts = time (NULL); \
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- if (r < 0) \
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- { \
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- if (errno == EINTR) \
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- continue; \
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- if (stop) \
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- shut (fildes); \
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- else \
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- { \
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- perror ("writing"); \
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- exit (EX_ERR); \
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- } \
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- } \
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- else if (r == 0) \
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- /*shut (fildes)*/; \
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- else \
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- (buffer).written += r; \
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- } \
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- while(0)
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-
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-void
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-tr (struct buffer *bp)
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-{
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- int i, j;
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-
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- for (i = j = bp->written; i < bp->avail;)
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- {
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- if (bp->buf[i] == '\r')
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- {
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- bp->cr = 1;
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- i++;
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- }
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- else
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- {
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- if (bp->cr)
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- {
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- bp->cr = 0;
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- if (bp->buf[i] != '\n')
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- bp->buf[j++] = '\r';
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- }
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- bp->buf[j++] = bp->buf[i++];
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- }
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- }
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- bp->avail = j;
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-}
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-
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-int stop;
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-int status;
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-
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-void
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-sigchld (int sig)
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-{
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- DEBUG (("child exited"));
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- wait (&status);
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- stop = 1;
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-}
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-
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-void
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-noecho (int fd)
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-{
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- struct termios to;
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-
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- if (tcgetattr (fd, &to))
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- {
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- perror ("tcgetattr");
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- exit (EX_ERR);
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- }
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- to.c_lflag |= ICANON;
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- to.c_lflag &= ~(ECHO | ISIG);
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- to.c_cc[VEOF] = C_EOT;
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- if (tcsetattr (fd, TCSAFLUSH | TCSASOFT, &to))
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- {
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- perror ("tcsetattr");
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- exit (EX_ERR);
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- }
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-}
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-
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-char *usage_text[] = {
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- "usage: ttyemu [-ah] [-i INFILE] [-o OUTFILE] [-t TIMEOUT] PROGRAM [ARGS...]",
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- "ttyemu runs PROGRAM with its first three file descriptors connected to a"
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- " terminal",
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- "",
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- "Options are:",
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- "",
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- " -a append output to OUTFILE, instead of overwriting it",
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- " -i INFILE read input from INFILE",
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- " -o OUTFILE write output to OUTFILE",
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- " -t TIMEOUT set I/O timeout",
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- " -h print this help summary",
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- "",
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- "Report bugs and suggestions to <[email protected]>.",
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- NULL
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-};
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-
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-static void
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-usage (void)
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-{
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- int i;
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-
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- for (i = 0; usage_text[i]; i++)
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- {
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- fputs (usage_text[i], stderr);
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- fputc ('\n', stderr);
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- }
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-}
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-
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-int
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-main (int argc, char **argv)
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-{
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- int i;
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- int master, slave;
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- pid_t pid;
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- fd_set rdset, wrset;
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- struct buffer ibuf, obuf;
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- int in = 0, out = 1;
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- char *infile = NULL, *outfile = NULL;
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- int outflags = O_TRUNC;
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- int maxfd;
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- int eot = C_EOT;
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- int timeout = 0;
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-
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- while ((i = getopt (argc, argv, "ai:o:t:h")) != EOF)
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- {
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- switch (i)
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- {
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- case 'a':
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- outflags &= ~O_TRUNC;
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- break;
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-
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- case 'i':
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- infile = optarg;
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- break;
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-
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- case 'o':
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- outfile = optarg;
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- break;
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-
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- case 't':
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- timeout = atoi (optarg);
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- break;
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-
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- case 'h':
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- usage ();
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- return EX_OK;
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-
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- default:
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- return EX_USAGE;
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- }
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- }
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-
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- argc -= optind;
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- argv += optind;
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-
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- if (argc == 0)
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- {
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- usage ();
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- return EX_USAGE;
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- }
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-
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- if (infile)
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- {
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- in = open (infile, O_RDONLY);
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- if (in == -1)
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- {
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- perror (infile);
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- return EX_ERR;
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- }
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- }
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-
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- if (outfile)
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- {
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- out = open (outfile, O_RDWR|O_CREAT|outflags, 0666);
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- if (out == -1)
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- {
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- perror (outfile);
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- return EX_ERR;
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- }
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- }
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-
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- master = posix_openpt (O_RDWR);
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- if (master == -1)
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- {
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- perror ("posix_openpty");
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- return EX_ERR;
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- }
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-
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- if (grantpt (master))
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- {
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- perror ("grantpt");
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- return EX_ERR;
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- }
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-
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- if (unlockpt (master))
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- {
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- perror ("unlockpt");
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- return EX_ERR;
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- }
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-
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- signal (SIGCHLD, sigchld);
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-
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- pid = fork ();
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- if (pid == -1)
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- {
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- perror ("fork");
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- return EX_ERR;
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- }
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-
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- if (pid == 0)
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- {
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- slave = open (ptsname (master), O_RDWR);
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- if (slave < 0)
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- {
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- perror ("open");
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- return EX_ERR;
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- }
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-
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- noecho (slave);
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- for (i = 0; i < 3; i++)
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- {
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- if (slave != i)
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- {
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- close (i);
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- if (dup (slave) != i)
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- {
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- perror ("dup");
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- _exit (EX_EXEC);
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- }
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- }
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- }
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- for (i = sysconf (_SC_OPEN_MAX) - 1; i > 2; --i)
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- close (i);
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-
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- setsid ();
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-#ifdef TIOCSCTTY
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- ioctl (0, TIOCSCTTY, 1);
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-#endif
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- execvp (argv[0], argv);
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- perror (argv[0]);
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- _exit (EX_EXEC);
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- }
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- sleep (1);
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-
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- bufinit (ibuf, 1);
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- bufinit (obuf, 1);
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- while (1)
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- {
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- FD_ZERO (&rdset);
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- FD_ZERO (&wrset);
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-
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- maxfd = 0;
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-
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- if (in != -1)
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- {
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- FD_SET (in, &rdset);
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- if (in > maxfd)
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- maxfd = in;
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- }
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-
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- if (master != -1)
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- {
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- FD_SET (master, &rdset);
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- if (!stop)
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- FD_SET (master, &wrset);
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- if (master > maxfd)
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- maxfd = master;
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- }
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-
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- if (maxfd == 0)
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- {
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- if (stop)
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- break;
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- pause ();
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- continue;
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- }
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-
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- if (select (maxfd + 1, &rdset, &wrset, NULL, NULL) < 0)
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- {
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- if (errno == EINTR)
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- continue;
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- perror ("select");
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- return EX_ERR;
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- }
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-
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- if (timeout)
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- {
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- time_t now = time (NULL);
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- if (now - ibuf.ts > timeout || now - obuf.ts > timeout)
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- {
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- fprintf (stderr, "ttyemu: I/O timeout\n");
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- return EX_ERR;
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- }
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- }
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-
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- if (in >= 0)
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- {
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- if (bufavail (ibuf) && FD_ISSET (in, &rdset))
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- bufread (ibuf, in, 0);
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- }
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- else if (master == -1)
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- break;
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-
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- if (master >= 0 && FD_ISSET (master, &wrset))
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- {
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- if (!bufisempty (ibuf))
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- bufwrite (ibuf, master);
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- else if (in == -1 && eot)
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- {
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- DEBUG (("sent EOT"));
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- if (write (master, &eot, 1) <= 0)
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- {
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- perror ("write");
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- return EX_ERR;
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- }
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- eot = 0;
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- }
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- }
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-
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- if (master >= 0 && bufavail (obuf) && FD_ISSET (master, &rdset))
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- bufread (obuf, master, 1);
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-
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- if (bufisempty (obuf))
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- bufinit (obuf, 0);
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- else
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- {
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- tr (&obuf);
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- bufwrite (obuf, out);
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- }
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-
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- if (bufisempty (ibuf))
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- bufinit (ibuf, 0);
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- }
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-
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- if (WIFEXITED (status))
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- return WEXITSTATUS (status);
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-
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- if (WIFSIGNALED (status))
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- fprintf (stderr, "ttyemu: child process %s failed on signal %d\n",
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- argv[0], WTERMSIG (status));
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- else
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- fprintf (stderr, "ttyemu: child process %s failed\n", argv[0]);
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- return EX_EXEC;
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-}
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Sergey Poznyakoff