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-rw-r--r--gdb/ser-pipe.c397
1 files changed, 397 insertions, 0 deletions
diff --git a/gdb/ser-pipe.c b/gdb/ser-pipe.c
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+++ b/gdb/ser-pipe.c
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+/* Serial interface for a pipe to a separate program
+ Copyright 1999 Free Software Foundation, Inc.
+
+ Contributed by Cygnus Solutions.
+
+ This file is part of GDB.
+
+ This program 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 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "serial.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <fcntl.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "signals.h"
+#include "gdb_string.h"
+
+extern int (*ui_loop_hook) PARAMS ((int));
+
+static int pipe_open PARAMS ((serial_t scb, const char *name));
+static void pipe_raw PARAMS ((serial_t scb));
+static int wait_for PARAMS ((serial_t scb, int timeout));
+static int pipe_readchar PARAMS ((serial_t scb, int timeout));
+static int pipe_setbaudrate PARAMS ((serial_t scb, int rate));
+static int pipe_setstopbits PARAMS ((serial_t scb, int num));
+static int pipe_write PARAMS ((serial_t scb, const char *str, int len));
+/* FIXME: static void pipe_restore PARAMS ((serial_t scb)); */
+static void pipe_close PARAMS ((serial_t scb));
+static serial_ttystate pipe_get_tty_state PARAMS ((serial_t scb));
+static int pipe_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
+static int pipe_return_0 PARAMS ((serial_t));
+static int pipe_noflush_set_tty_state PARAMS ((serial_t, serial_ttystate,
+ serial_ttystate));
+static void pipe_print_tty_state PARAMS ((serial_t, serial_ttystate));
+
+extern void _initialize_ser_pipe PARAMS ((void));
+
+/* Open up a raw pipe */
+
+static int
+pipe_open (scb, name)
+ serial_t scb;
+ const char *name;
+{
+#if !defined(O_NONBLOCK) || !defined(F_GETFL) || !defined(F_SETFL)
+ return -1;
+#else
+#if defined (__NetBSD__) || defined (__FreeBSD__)
+
+ /* check the BSD popen sources for where "r+" comes from :-) */
+ FILE *stream;
+ stream = popen (name + 1, "r+");
+ if (stream == NULL)
+ {
+ fprintf_unfiltered (gdb_stderr, "%s: popen failed\n", name + 1);
+ return -1;
+ }
+ scb->ttystate = stream; /* borrow that space */
+ scb->fd = fileno (stream);
+
+#else
+
+ /* This chunk: */
+
+ /* Copyright (c) 1988, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software written by Ken Arnold and
+ * published in UNIX Review, Vol. 6, No. 8.
+ */
+ int pdes[2];
+ int pid;
+ if (socketpair (AF_UNIX, SOCK_STREAM, 0, pdes) < 0)
+ return -1;
+
+ switch (pid = vfork ())
+ {
+ case -1: /* Error. */
+ close (pdes[0]);
+ close (pdes[1]);
+ return -1;
+ case 0: /* Child. */
+#if 0
+ /* POSIX.2 B.3.2.2 "popen() shall ensure that any streams
+ from previous popen() calls that remain open in the
+ parent process are closed in the new child process. */
+ for (old = pidlist; old; old = old->next)
+ close (fileno (old->fp)); /* don't allow a flush */
+#endif
+ close (pdes[0]);
+ if (pdes[1] != STDOUT_FILENO)
+ {
+ dup2 (pdes[1], STDOUT_FILENO);
+ close (pdes[1]);
+ }
+ dup2 (STDOUT_FILENO, STDIN_FILENO);
+ execl ("/bin/sh", "sh", "-c", name + 1, NULL);
+ _exit (127);
+ }
+
+ /* Parent; assume fdopen can't fail. */
+ close (pdes[1]);
+ scb->fd = pdes[0];
+ scb->ttystate = NULL;
+#endif
+
+ /* Make it non-blocking */
+ {
+ int flags = fcntl (scb->fd, F_GETFL, 0);
+ if (fcntl (scb->fd, F_SETFL, flags | O_NONBLOCK) < 0)
+ {
+ perror ("ser-pipe");
+ pipe_close (scb);
+ return -1;
+ }
+ }
+
+ /* If we don't do this, GDB simply exits when the remote side dies. */
+ signal (SIGPIPE, SIG_IGN);
+ return 0;
+#endif
+}
+
+static serial_ttystate
+pipe_get_tty_state (scb)
+ serial_t scb;
+{
+ /* return garbage */
+ return xmalloc (sizeof (int));
+}
+
+static int
+pipe_set_tty_state (scb, ttystate)
+ serial_t scb;
+ serial_ttystate ttystate;
+{
+ return 0;
+}
+
+static int
+pipe_return_0 (scb)
+ serial_t scb;
+{
+ return 0;
+}
+
+static void
+pipe_raw (scb)
+ serial_t scb;
+{
+ return; /* Always in raw mode */
+}
+
+/* Wait for input on scb, with timeout seconds. Returns 0 on success,
+ otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
+
+ For termio{s}, we actually just setup VTIME if necessary, and let the
+ timeout occur in the read() in pipe_read().
+ */
+
+static int
+wait_for (scb, timeout)
+ serial_t scb;
+ int timeout;
+{
+ int numfds;
+ struct timeval tv;
+ fd_set readfds, exceptfds;
+
+ FD_ZERO (&readfds);
+ FD_ZERO (&exceptfds);
+
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+
+ FD_SET (scb->fd, &readfds);
+ FD_SET (scb->fd, &exceptfds);
+
+ while (1)
+ {
+ if (timeout >= 0)
+ numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
+ else
+ numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
+
+ if (numfds <= 0)
+ {
+ if (numfds == 0)
+ return SERIAL_TIMEOUT;
+ else if (errno == EINTR)
+ continue;
+ else
+ return SERIAL_ERROR; /* Got an error from select or poll */
+ }
+
+ return 0;
+ }
+}
+
+/* Read a character with user-specified timeout. TIMEOUT is number of seconds
+ to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
+ char if successful. Returns -2 if timeout expired, EOF if line dropped
+ dead, or -3 for any other error (see errno in that case). */
+
+static int
+pipe_readchar (scb, timeout)
+ serial_t scb;
+ int timeout;
+{
+ int status;
+ int delta;
+
+ if (scb->bufcnt-- > 0)
+ return *scb->bufp++;
+
+ /* We have to be able to keep the GUI alive here, so we break the original
+ timeout into steps of 1 second, running the "keep the GUI alive" hook
+ each time through the loop.
+
+ Also, timeout = 0 means to poll, so we just set the delta to 0, so we
+ will only go through the loop once. */
+
+ delta = (timeout == 0 ? 0 : 1);
+ while (1)
+ {
+
+ /* N.B. The UI may destroy our world (for instance by calling
+ remote_stop,) in which case we want to get out of here as
+ quickly as possible. It is not safe to touch scb, since
+ someone else might have freed it. The ui_loop_hook signals that
+ we should exit by returning 1. */
+
+ if (ui_loop_hook)
+ {
+ if (ui_loop_hook (0))
+ return SERIAL_TIMEOUT;
+ }
+
+ status = wait_for (scb, delta);
+ timeout -= delta;
+
+ /* If we got a character or an error back from wait_for, then we can
+ break from the loop before the timeout is completed. */
+
+ if (status != SERIAL_TIMEOUT)
+ {
+ break;
+ }
+
+ /* If we have exhausted the original timeout, then generate
+ a SERIAL_TIMEOUT, and pass it out of the loop. */
+
+ else if (timeout == 0)
+ {
+ status == SERIAL_TIMEOUT;
+ break;
+ }
+ }
+
+ if (status < 0)
+ return status;
+
+ while (1)
+ {
+ scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
+ if (scb->bufcnt != -1 || errno != EINTR)
+ break;
+ }
+
+ if (scb->bufcnt <= 0)
+ {
+ if (scb->bufcnt == 0)
+ return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
+ distinguish between EOF & timeouts
+ someday] */
+ else
+ return SERIAL_ERROR; /* Got an error from read */
+ }
+
+ scb->bufcnt--;
+ scb->bufp = scb->buf;
+ return *scb->bufp++;
+}
+
+static int
+pipe_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
+ serial_t scb;
+ serial_ttystate new_ttystate;
+ serial_ttystate old_ttystate;
+{
+ return 0;
+}
+
+static void
+pipe_print_tty_state (scb, ttystate)
+ serial_t scb;
+ serial_ttystate ttystate;
+{
+ /* Nothing to print. */
+ return;
+}
+
+static int
+pipe_setbaudrate (scb, rate)
+ serial_t scb;
+ int rate;
+{
+ return 0; /* Never fails! */
+}
+
+static int
+pipe_setstopbits (scb, num)
+ serial_t scb;
+ int num;
+{
+ return 0; /* Never fails! */
+}
+
+static int
+pipe_write (scb, str, len)
+ serial_t scb;
+ const char *str;
+ int len;
+{
+ int cc;
+
+ while (len > 0)
+ {
+ cc = write (scb->fd, str, len);
+
+ if (cc < 0)
+ return 1;
+ len -= cc;
+ str += cc;
+ }
+ return 0;
+}
+
+static void
+pipe_close (scb)
+ serial_t scb;
+{
+ if (scb->fd < 0)
+ return;
+ if (scb->ttystate != NULL)
+ pclose ((FILE *) scb->ttystate);
+ else
+ close (scb->fd);
+ scb->ttystate = NULL;
+ scb->fd = -1;
+}
+
+static struct serial_ops pipe_ops =
+{
+ "pipe",
+ 0,
+ pipe_open,
+ pipe_close,
+ pipe_readchar,
+ pipe_write,
+ pipe_return_0, /* flush output */
+ pipe_return_0, /* flush input */
+ pipe_return_0, /* send break */
+ pipe_raw,
+ pipe_get_tty_state,
+ pipe_set_tty_state,
+ pipe_print_tty_state,
+ pipe_noflush_set_tty_state,
+ pipe_setbaudrate,
+ pipe_setstopbits,
+ pipe_return_0, /* wait for output to drain */
+};
+
+void
+_initialize_ser_pipe ()
+{
+ serial_add_interface (&pipe_ops);
+}
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