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/*
* Copyright (C) 2008-2014 Tobias Brunner
* Copyright (C) 2005-2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "utils.h"
#include <unistd.h>
#include <limits.h>
#ifndef WIN32
# include <signal.h>
#endif
#include <library.h>
#include <collections/enumerator.h>
#ifdef WIN32
#include <threading/mutex.h>
#include <threading/condvar.h>
/**
* Flag to indicate signaled wait_sigint()
*/
static bool sigint_signaled = FALSE;
/**
* Condvar to wait in wait_sigint()
*/
static condvar_t *sigint_cond;
/**
* Mutex to check signaling()
*/
static mutex_t *sigint_mutex;
/**
* Control handler to catch ^C
*/
static BOOL WINAPI handler(DWORD dwCtrlType)
{
switch (dwCtrlType)
{
case CTRL_C_EVENT:
case CTRL_BREAK_EVENT:
case CTRL_CLOSE_EVENT:
sigint_mutex->lock(sigint_mutex);
sigint_signaled = TRUE;
sigint_cond->signal(sigint_cond);
sigint_mutex->unlock(sigint_mutex);
return TRUE;
default:
return FALSE;
}
}
/**
* Windows variant
*/
void wait_sigint()
{
SetConsoleCtrlHandler(handler, TRUE);
sigint_mutex = mutex_create(MUTEX_TYPE_DEFAULT);
sigint_cond = condvar_create(CONDVAR_TYPE_DEFAULT);
sigint_mutex->lock(sigint_mutex);
while (!sigint_signaled)
{
sigint_cond->wait(sigint_cond, sigint_mutex);
}
sigint_mutex->unlock(sigint_mutex);
sigint_mutex->destroy(sigint_mutex);
sigint_cond->destroy(sigint_cond);
}
#else /* !WIN32 */
/**
* Unix variant
*/
void wait_sigint()
{
sigset_t set;
int sig;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGTERM);
sigprocmask(SIG_BLOCK, &set, NULL);
sigwait(&set, &sig);
}
#endif
#ifndef HAVE_CLOSEFROM
/**
* Described in header.
*/
void closefrom(int lowfd)
{
char fd_dir[PATH_MAX];
int maxfd, fd, len;
/* try to close only open file descriptors on Linux... */
len = snprintf(fd_dir, sizeof(fd_dir), "/proc/%u/fd", getpid());
if (len > 0 && len < sizeof(fd_dir) && access(fd_dir, F_OK) == 0)
{
enumerator_t *enumerator = enumerator_create_directory(fd_dir);
if (enumerator)
{
char *rel;
while (enumerator->enumerate(enumerator, &rel, NULL, NULL))
{
fd = atoi(rel);
if (fd >= lowfd)
{
close(fd);
}
}
enumerator->destroy(enumerator);
return;
}
}
/* ...fall back to closing all fds otherwise */
#ifdef WIN32
maxfd = _getmaxstdio();
#else
maxfd = (int)sysconf(_SC_OPEN_MAX);
#endif
if (maxfd < 0)
{
maxfd = 256;
}
for (fd = lowfd; fd < maxfd; fd++)
{
close(fd);
}
}
#endif /* HAVE_CLOSEFROM */
/**
* return null
*/
void *return_null()
{
return NULL;
}
/**
* returns TRUE
*/
bool return_true()
{
return TRUE;
}
/**
* returns FALSE
*/
bool return_false()
{
return FALSE;
}
/**
* nop operation
*/
void nop()
{
}
/**
* See header
*/
void utils_init()
{
#ifdef WIN32
windows_init();
#endif
atomics_init();
strerror_init();
}
/**
* See header
*/
void utils_deinit()
{
#ifdef WIN32
windows_deinit();
#endif
atomics_deinit();
strerror_deinit();
}
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