/* input.c -- functions to perform buffered input with synchronization. */
-/* Copyright (C) 1992 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2009 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
- Bash is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bash is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
- You should have received a copy of the GNU General Public License along
- with Bash; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+ You should have received a copy of the GNU General Public License
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
#include "config.h"
#include "error.h"
#include "externs.h"
#include "quit.h"
+#include "trap.h"
#if !defined (errno)
extern int errno;
#endif /* !errno */
+#if defined (EAGAIN)
+# define X_EAGAIN EAGAIN
+#else
+# define X_EAGAIN -99
+#endif
+
+#if defined (EWOULDBLOCK)
+# define X_EWOULDBLOCK EWOULDBLOCK
+#else
+# define X_EWOULDBLOCK -99
+#endif
+
extern void termsig_handler __P((int));
/* Functions to handle reading input on systems that don't restart read(2)
{
while (1)
{
- CHECK_TERMSIG;
+ QUIT;
+ run_pending_traps ();
+
local_bufused = read (fileno (stream), localbuf, sizeof(localbuf));
if (local_bufused > 0)
break;
- else if (local_bufused == 0 || errno != EINTR)
+ else if (local_bufused == 0)
{
local_index = 0;
return EOF;
}
+ else if (errno == X_EAGAIN || errno == X_EWOULDBLOCK)
+ {
+ if (sh_unset_nodelay_mode (fileno (stream)) < 0)
+ {
+ sys_error (_("cannot reset nodelay mode for fd %d"), fileno (stream));
+ local_index = local_bufused = 0;
+ return EOF;
+ }
+ continue;
+ }
+ else if (errno != EINTR)
+ {
+ local_index = local_bufused = 0;
+ return EOF;
+ }
+ else if (interrupt_state || terminating_signal) /* QUIT; */
+ local_index = local_bufused = 0;
}
local_index = 0;
}
bp->b_used = bp->b_inputp = bp->b_flag = 0;
if (bufsize == 1)
bp->b_flag |= B_UNBUFF;
+ if (O_TEXT && (fcntl (fd, F_GETFL) & O_TEXT) != 0)
+ bp->b_flag |= O_TEXT;
return (bp);
}
the buffered stream. Make sure the file descriptor used to save bash
input is set close-on-exec. Returns 0 on success, -1 on failure. This
works only if fd is > 0 -- if fd == 0 and bash is reading input from
- fd 0, save_bash_input is used instead, to cooperate with input
+ fd 0, sync_buffered_stream is used instead, to cooperate with input
redirection (look at redir.c:add_undo_redirect()). */
int
check_bash_input (fd)
}
/* Return 1 if a seek on FD will succeed. */
-#ifndef __CYGWIN__
-# define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0)
-#else
-# define fd_is_seekable(fd) 0
-#endif /* __CYGWIN__ */
+#define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0)
/* Take FD, a file descriptor, and create and return a buffered stream
corresponding to it. If something is wrong and the file descriptor
return (close_buffered_stream (buffers[fd]));
}
-/* Make the BUFFERED_STREAM associcated with buffers[FD] be BP, and return
+/* Make the BUFFERED_STREAM associated with buffers[FD] be BP, and return
the old BUFFERED_STREAM. */
BUFFERED_STREAM *
set_buffered_stream (fd, bp)
BUFFERED_STREAM *bp;
{
ssize_t nr;
+ off_t o;
CHECK_TERMSIG;
- nr = zread (bp->b_fd, bp->b_buffer, bp->b_size);
+ /* In an environment where text and binary files are treated differently,
+ compensate for lseek() on text files returning an offset different from
+ the count of characters read() returns. Text-mode streams have to be
+ treated as unbuffered. */
+ if ((bp->b_flag & (B_TEXT | B_UNBUFF)) == B_TEXT)
+ {
+ o = lseek (bp->b_fd, 0, SEEK_CUR);
+ nr = zread (bp->b_fd, bp->b_buffer, bp->b_size);
+ if (nr > 0 && nr < lseek (bp->b_fd, 0, SEEK_CUR) - o)
+ {
+ lseek (bp->b_fd, o, SEEK_SET);
+ bp->b_flag |= B_UNBUFF;
+ bp->b_size = 1;
+ nr = zread (bp->b_fd, bp->b_buffer, bp->b_size);
+ }
+ }
+ else
+ nr = zread (bp->b_fd, bp->b_buffer, bp->b_size);
if (nr <= 0)
{
bp->b_used = 0;
return (EOF);
}
-#if defined (__CYGWIN__)
- /* If on cygwin, translate \r\n to \n. */
- if (nr >= 2 && bp->b_buffer[nr - 2] == '\r' && bp->b_buffer[nr - 1] == '\n')
- {
- bp->b_buffer[nr - 2] = '\n';
- nr--;
- }
-#endif
-
bp->b_used = nr;
bp->b_inputp = 0;
return (bp->b_buffer[bp->b_inputp++] & 0xFF);
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