wd.c
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2011 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <argp.h>
#include <mailutils/diag.h>
/* A debugging hook.
Suspend execution to let the developer to attach to the current process
using gdb.
Wait at most TO seconds. If TO is 0, wait forever. */
void
mu_wd (unsigned to)
{
unsigned volatile _count_down;
pid_t pid = getpid ();
if (to)
mu_diag_output (MU_DIAG_CRIT,
"process %lu is waiting for debug (%u seconds left)",
(unsigned long) pid, to);
else
mu_diag_output (MU_DIAG_CRIT,
"process %lu is waiting for debug",
(unsigned long) pid);
mu_diag_output (MU_DIAG_CRIT,
"to attach: gdb -ex 'set variable mu_wd::_count_down=0' %s %lu",
program_invocation_name, (unsigned long) pid);
if (to)
{
_count_down = to;
while (_count_down)
{
sleep (1);
_count_down--;
}
}
else
{
_count_down = 1;
while (_count_down)
{
sleep (1);
}
}
mu_diag_output (MU_DIAG_CRIT, "process %lu finished waiting",
(unsigned long) pid);
}