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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/times.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "glib.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#ifdef STDC_HEADERS
#include <string.h> /* for bzero on BSD systems */
#endif
#define INTERACTIVE 0
#define STACK_TRACE 1
#ifndef NO_FD_SET
# define SELECT_MASK fd_set
#else
# ifndef _AIX
typedef long fd_mask;
# endif
# if defined(_IBMR2)
# define SELECT_MASK void
# else
# define SELECT_MASK int
# endif
#endif
static int do_query (char *prompt);
static void debug (const gchar *progname, int method);
static void stack_trace (char **);
static void stack_trace_sigchld (int);
static int stack_trace_done;
void
g_debug (const gchar *progname)
{
char buf[32];
fprintf (stdout, "[n]othing, [e]xit, [s]tack trace, [a]ttach to process: ");
fflush (stdout);
fgets (buf, 32, stdin);
if (strcmp (buf, "n\n") == 0)
return;
else if (strcmp (buf, "s\n") == 0)
debug (progname, STACK_TRACE);
else if (strcmp (buf, "a\n") == 0)
debug (progname, INTERACTIVE);
else
exit (0);
}
void
g_attach_process (const gchar *progname,
gboolean query)
{
if (!query || do_query ("attach to process"))
debug (progname, INTERACTIVE);
}
void
g_stack_trace (const gchar *progname,
gboolean query)
{
if (!query || do_query ("print stack trace"))
debug (progname, STACK_TRACE);
}
static int
do_query (char *prompt)
{
char buf[32];
fprintf (stdout, "%s (y/n) ", prompt);
fflush (stdout);
fgets (buf, 32, stdin);
if ((strcmp (buf, "yes\n") == 0) ||
(strcmp (buf, "y\n") == 0) ||
(strcmp (buf, "YES\n") == 0) ||
(strcmp (buf, "Y\n") == 0))
return TRUE;
return FALSE;
}
static void
debug (const char *progname,
int method)
{
pid_t pid;
char buf[16];
char *args[4] = { "gdb", NULL, NULL, NULL };
volatile int x;
sprintf (buf, "%d", (int) getpid ());
args[1] = (gchar*) progname;
args[2] = buf;
switch (method)
{
case INTERACTIVE:
fprintf (stdout, "pid: %s\n", buf);
break;
case STACK_TRACE:
pid = fork ();
if (pid == 0)
{
stack_trace (args);
_exit (0);
}
else if (pid == (pid_t) -1)
{
perror ("could not fork");
return;
}
break;
}
x = 1;
while (x)
;
}
static void
stack_trace (char **args)
{
pid_t pid;
int in_fd[2];
int out_fd[2];
SELECT_MASK fdset;
SELECT_MASK readset;
struct timeval tv;
int sel, index, state;
char buffer[256];
char c;
stack_trace_done = 0;
signal (SIGCHLD, stack_trace_sigchld);
if ((pipe (in_fd) == -1) || (pipe (out_fd) == -1))
{
perror ("could open pipe");
_exit (0);
}
pid = fork ();
if (pid == 0)
{
close (0); dup (in_fd[0]); /* set the stdin to the in pipe */
close (1); dup (out_fd[1]); /* set the stdout to the out pipe */
close (2); dup (out_fd[1]); /* set the stderr to the out pipe */
execvp (args[0], args); /* exec gdb */
perror ("exec failed");
_exit (0);
}
else if (pid == (pid_t) -1)
{
perror ("could not fork");
_exit (0);
}
FD_ZERO (&fdset);
FD_SET (out_fd[0], &fdset);
write (in_fd[1], "backtrace\n", 10);
write (in_fd[1], "p x = 0\n", 8);
write (in_fd[1], "quit\n", 5);
index = 0;
state = 0;
while (1)
{
readset = fdset;
tv.tv_sec = 1;
tv.tv_usec = 0;
sel = select (FD_SETSIZE, &readset, NULL, NULL, &tv);
if (sel == -1)
break;
if ((sel > 0) && (FD_ISSET (out_fd[0], &readset)))
{
if (read (out_fd[0], &c, 1))
{
switch (state)
{
case 0:
if (c == '#')
{
state = 1;
index = 0;
buffer[index++] = c;
}
break;
case 1:
buffer[index++] = c;
if ((c == '\n') || (c == '\r'))
{
buffer[index] = 0;
fprintf (stdout, "%s", buffer);
state = 0;
index = 0;
}
break;
default:
break;
}
}
}
else if (stack_trace_done)
break;
}
close (in_fd[0]);
close (in_fd[1]);
close (out_fd[0]);
close (out_fd[1]);
_exit (0);
}
static void
stack_trace_sigchld (int signum)
{
stack_trace_done = 1;
}
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