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* syscall.c (cb_syscall) <case CB_SYS_pipe>: New case.
* callback.c [HAVE_LIMITS_H]: Include limits.h. Include libiberty.h. (os_close, os_read, os_write, os_fstat, os_ftruncate): Support fd being either end of a pipe. (os_pipe, os_pipe_empty, os_pipe_nonempty): New functions. (os_shutdown): Clear pipe state. (default_callback): Initialize new members.
This commit is contained in:
Hans-Peter Nilsson
parent
6a7e5cfe8c
commit
97f669eda9
@ -1,5 +1,14 @@
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2005-01-28 Hans-Peter Nilsson <hp@axis.com>
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* syscall.c (cb_syscall) <case CB_SYS_pipe>: New case.
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* callback.c [HAVE_LIMITS_H]: Include limits.h.
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Include libiberty.h.
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(os_close, os_read, os_write, os_fstat, os_ftruncate): Support fd
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being either end of a pipe.
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(os_pipe, os_pipe_empty, os_pipe_nonempty): New functions.
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(os_shutdown): Clear pipe state.
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(default_callback): Initialize new members.
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* callback.c (default_callback): Initialize target_endian.
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(cb_store_target_endian): Renamed from store, new first parameter
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host_callback *cb, drop last parameter big_p. Take endianness
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@ -42,6 +42,10 @@
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#include <strings.h>
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#endif
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#endif
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#ifdef HAVE_LIMITS_H
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/* For PIPE_BUF. */
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#include <limits.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <time.h>
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@ -49,6 +53,8 @@
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#include <sys/stat.h>
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#include "gdb/callback.h"
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#include "targ-vals.h"
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/* For xmalloc. */
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#include "libiberty.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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@ -144,7 +150,48 @@ os_close (p, fd)
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if (fd != i)
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p->fd_buddy[i] = p->fd_buddy[fd];
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else
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result = wrap (p, close (fdmap (p, fd)));
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{
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if (p->ispipe[fd])
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{
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int other = p->ispipe[fd];
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int reader, writer;
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if (other > 0)
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{
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/* Closing the read side. */
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reader = fd;
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writer = other;
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}
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else
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{
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/* Closing the write side. */
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writer = fd;
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reader = -other;
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}
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/* If there was data in the buffer, make a last "now empty"
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call, then deallocate data. */
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if (p->pipe_buffer[writer].buffer != NULL)
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{
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(*p->pipe_empty) (p, reader, writer);
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free (p->pipe_buffer[writer].buffer);
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p->pipe_buffer[writer].buffer = NULL;
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}
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/* Clear pipe data for this side. */
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p->pipe_buffer[fd].size = 0;
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p->ispipe[fd] = 0;
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/* If this was the first close, mark the other side as the
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only remaining side. */
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if (fd != abs (other))
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p->ispipe[abs (other)] = -other;
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p->fd_buddy[fd] = -1;
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return 0;
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}
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result = wrap (p, close (fdmap (p, fd)));
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}
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p->fd_buddy[fd] = -1;
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return result;
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@ -270,6 +317,47 @@ os_read (p, fd, buf, len)
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result = fdbad (p, fd);
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if (result)
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return result;
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if (p->ispipe[fd])
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{
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int writer = p->ispipe[fd];
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/* Can't read from the write-end. */
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if (writer < 0)
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{
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p->last_errno = EBADF;
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return -1;
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}
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/* Nothing to read if nothing is written. */
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if (p->pipe_buffer[writer].size == 0)
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return 0;
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/* Truncate read request size to buffer size minus what's already
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read. */
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if (len > p->pipe_buffer[writer].size - p->pipe_buffer[fd].size)
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len = p->pipe_buffer[writer].size - p->pipe_buffer[fd].size;
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memcpy (buf, p->pipe_buffer[writer].buffer + p->pipe_buffer[fd].size,
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len);
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/* Account for what we just read. */
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p->pipe_buffer[fd].size += len;
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/* If we've read everything, empty and deallocate the buffer and
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signal buffer-empty to client. (This isn't expected to be a
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hot path in the simulator, so we don't hold on to the buffer.) */
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if (p->pipe_buffer[fd].size == p->pipe_buffer[writer].size)
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{
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free (p->pipe_buffer[writer].buffer);
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p->pipe_buffer[writer].buffer = NULL;
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p->pipe_buffer[fd].size = 0;
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p->pipe_buffer[writer].size = 0;
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(*p->pipe_empty) (p, fd, writer);
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}
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return len;
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}
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result = wrap (p, read (fdmap (p, fd), buf, len));
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return result;
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}
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@ -296,6 +384,49 @@ os_write (p, fd, buf, len)
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result = fdbad (p, fd);
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if (result)
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return result;
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if (p->ispipe[fd])
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{
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int reader = -p->ispipe[fd];
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/* Can't write to the read-end. */
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if (reader < 0)
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{
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p->last_errno = EBADF;
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return -1;
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}
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/* Can't write to pipe with closed read end.
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FIXME: We should send a SIGPIPE. */
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if (reader == fd)
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{
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p->last_errno = EPIPE;
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return -1;
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}
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/* As a sanity-check, we bail out it the buffered contents is much
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larger than the size of the buffer on the host. We don't want
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to run out of memory in the simulator due to a target program
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bug if we can help it. Unfortunately, regarding the value that
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reaches the simulated program, it's no use returning *less*
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than the requested amount, because cb_syscall loops calling
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this function until the whole amount is done. */
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if (p->pipe_buffer[fd].size + len > 10 * PIPE_BUF)
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{
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p->last_errno = EFBIG;
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return -1;
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}
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p->pipe_buffer[fd].buffer
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= xrealloc (p->pipe_buffer[fd].buffer, p->pipe_buffer[fd].size + len);
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memcpy (p->pipe_buffer[fd].buffer + p->pipe_buffer[fd].size,
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buf, len);
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p->pipe_buffer[fd].size += len;
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(*p->pipe_nonempty) (p, reader, fd);
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return len;
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}
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real_fd = fdmap (p, fd);
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switch (real_fd)
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{
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@ -400,6 +531,36 @@ os_fstat (p, fd, buf)
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{
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if (fdbad (p, fd))
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return -1;
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if (p->ispipe[fd])
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{
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time_t t = (*p->time) (p, NULL);
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/* We have to fake the struct stat contents, since the pipe is
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made up in the simulator. */
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memset (buf, 0, sizeof (*buf));
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#ifdef HAVE_STRUCT_STAT_ST_MODE
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buf->st_mode = S_IFIFO;
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#endif
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/* If more accurate tracking than current-time is needed (for
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example, on GNU/Linux we get accurate numbers), the p->time
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callback (which may be something other than os_time) should
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happen for each read and write, and we'd need to keep track of
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atime, ctime and mtime. */
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#ifdef HAVE_STRUCT_STAT_ST_ATIME
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buf->st_atime = t;
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#endif
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#ifdef HAVE_STRUCT_STAT_ST_CTIME
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buf->st_ctime = t;
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#endif
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#ifdef HAVE_STRUCT_STAT_ST_MTIME
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buf->st_mtime = t;
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#endif
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return 0;
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}
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/* ??? There is an issue of when to translate to the target layout.
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One could do that inside this function, or one could have the
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caller do it. It's more flexible to let the caller do it, though
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@ -426,6 +587,11 @@ os_ftruncate (p, fd, len)
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int result;
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result = fdbad (p, fd);
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if (p->ispipe[fd])
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{
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p->last_errno = EINVAL;
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return -1;
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}
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if (result)
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return result;
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result = wrap (p, ftruncate (fdmap (p, fd), len));
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@ -441,6 +607,67 @@ os_truncate (p, file, len)
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return wrap (p, truncate (file, len));
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}
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static int
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os_pipe (p, filedes)
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host_callback *p;
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int *filedes;
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{
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int i;
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/* We deliberately don't use fd 0. It's probably stdin anyway. */
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for (i = 1; i < MAX_CALLBACK_FDS; i++)
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{
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int j;
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if (p->fd_buddy[i] < 0)
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for (j = i + 1; j < MAX_CALLBACK_FDS; j++)
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if (p->fd_buddy[j] < 0)
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{
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/* Found two free fd:s. Set stat to allocated and mark
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pipeness. */
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p->fd_buddy[i] = i;
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p->fd_buddy[j] = j;
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p->ispipe[i] = j;
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p->ispipe[j] = -i;
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filedes[0] = i;
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filedes[1] = j;
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/* Poison the FD map to make bugs apparent. */
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p->fdmap[i] = -1;
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p->fdmap[j] = -1;
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return 0;
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}
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}
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p->last_errno = EMFILE;
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return -1;
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}
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/* Stub functions for pipe support. They should always be overridden in
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targets using the pipe support, but that's up to the target. */
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/* Called when the simulator says that the pipe at (reader, writer) is
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now empty (so the writer should leave its waiting state). */
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static void
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os_pipe_empty (p, reader, writer)
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host_callback *p;
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int reader;
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int writer;
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{
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}
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/* Called when the simulator says the pipe at (reader, writer) is now
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non-empty (so the writer should wait). */
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static void
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os_pipe_nonempty (p, reader, writer)
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host_callback *p;
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int reader;
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int writer;
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{
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}
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static int
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os_shutdown (p)
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host_callback *p;
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@ -450,6 +677,13 @@ os_shutdown (p)
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{
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int do_close = 1;
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/* Zero out all pipe state. Don't call callbacks for non-empty
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pipes; the target program has likely terminated at this point
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or we're called at initialization time. */
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p->ispipe[i] = 0;
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p->pipe_buffer[i].size = 0;
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p->pipe_buffer[i].buffer = NULL;
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next = p->fd_buddy[i];
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if (next < 0)
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continue;
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@ -604,6 +838,10 @@ host_callback default_callback =
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os_ftruncate,
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os_truncate,
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os_pipe,
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os_pipe_empty,
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os_pipe_nonempty,
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os_poll_quit,
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os_shutdown,
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@ -619,6 +857,8 @@ host_callback default_callback =
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{ 0, }, /* fdmap */
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{ -1, }, /* fd_buddy */
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{ 0, }, /* ispipe */
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{ { 0, 0 }, }, /* pipe_buffer */
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0, /* syscall_map */
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0, /* errno_map */
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@ -628,6 +868,7 @@ host_callback default_callback =
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/* Defaults expected to be overridden at initialization, where needed. */
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BFD_ENDIAN_UNKNOWN, /* target_endian */
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4, /* target_sizeof_int */
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HOST_CALLBACK_MAGIC,
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};
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@ -572,6 +572,33 @@ cb_syscall (cb, sc)
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}
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break;
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case CB_SYS_pipe :
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{
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int p[2];
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char *target_p = xcalloc (1, cb->target_sizeof_int * 2);
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result = (*cb->pipe) (cb, p);
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if (result != 0)
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goto ErrorFinish;
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cb_store_target_endian (cb, target_p, cb->target_sizeof_int, p[0]);
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cb_store_target_endian (cb, target_p + cb->target_sizeof_int,
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cb->target_sizeof_int, p[1]);
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if ((*sc->write_mem) (cb, sc, sc->arg1, target_p,
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cb->target_sizeof_int * 2)
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!= cb->target_sizeof_int * 2)
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{
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/* Close the pipe fd:s. */
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(*cb->close) (cb, p[0]);
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(*cb->close) (cb, p[1]);
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errcode = EFAULT;
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result = -1;
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}
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free (target_p);
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}
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break;
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case CB_SYS_time :
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{
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/* FIXME: May wish to change CB_SYS_time to something else.
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