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/*
* Copyright (c) 2009 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "hi_locl.h"
#ifdef HAVE_GCD
#include <dispatch/dispatch.h>
#else
#include "heim_threads.h"
#endif
struct heim_icred {
uid_t uid;
gid_t gid;
pid_t pid;
pid_t session;
};
void
heim_ipc_free_cred(heim_icred cred)
{
free(cred);
}
uid_t
heim_ipc_cred_get_uid(heim_icred cred)
{
return cred ? cred->uid : (uid_t)-1;
}
gid_t
heim_ipc_cred_get_gid(heim_icred cred)
{
return cred ? cred->gid : (gid_t)-1;
}
pid_t
heim_ipc_cred_get_pid(heim_icred cred)
{
return cred ? cred->pid : (pid_t)0;
}
pid_t
heim_ipc_cred_get_session(heim_icred cred)
{
return cred ? cred->session : (pid_t)-1;
}
int
_heim_ipc_create_cred(uid_t uid, gid_t gid, pid_t pid, pid_t session, heim_icred *cred)
{
*cred = calloc(1, sizeof(**cred));
if (*cred == NULL)
return ENOMEM;
(*cred)->uid = uid;
(*cred)->gid = gid;
(*cred)->pid = pid;
(*cred)->session = session;
return 0;
}
#ifndef HAVE_GCD
struct heim_isemaphore {
HEIMDAL_MUTEX mutex;
#ifdef ENABLE_PTHREAD_SUPPORT
pthread_cond_t cond;
#endif
long counter;
};
#endif
heim_isemaphore
heim_ipc_semaphore_create(long value)
{
#ifdef HAVE_GCD
return (heim_isemaphore)dispatch_semaphore_create(value);
#elif !defined(ENABLE_PTHREAD_SUPPORT)
heim_assert(0, "no semaphore support w/o pthreads");
return NULL;
#else
heim_isemaphore s = malloc(sizeof(*s));
if (s == NULL)
return NULL;
HEIMDAL_MUTEX_init(&s->mutex);
pthread_cond_init(&s->cond, NULL);
s->counter = value;
return s;
#endif
}
long
heim_ipc_semaphore_wait(heim_isemaphore s, time_t t)
{
#ifdef HAVE_GCD
uint64_t timeout;
if (t == HEIM_IPC_WAIT_FOREVER)
timeout = DISPATCH_TIME_FOREVER;
else
timeout = (uint64_t)t * NSEC_PER_SEC;
return dispatch_semaphore_wait((dispatch_semaphore_t)s, timeout);
#elif !defined(ENABLE_PTHREAD_SUPPORT)
heim_assert(0, "no semaphore support w/o pthreads");
return 0;
#else
HEIMDAL_MUTEX_lock(&s->mutex);
/* if counter hits below zero, we get to wait */
if (--s->counter < 0) {
int ret;
if (t == HEIM_IPC_WAIT_FOREVER)
ret = pthread_cond_wait(&s->cond, &s->mutex);
else {
struct timespec ts;
ts.tv_sec = t;
ts.tv_nsec = 0;
ret = pthread_cond_timedwait(&s->cond, &s->mutex, &ts);
}
if (ret) {
HEIMDAL_MUTEX_unlock(&s->mutex);
return errno;
}
}
HEIMDAL_MUTEX_unlock(&s->mutex);
return 0;
#endif
}
long
heim_ipc_semaphore_signal(heim_isemaphore s)
{
#ifdef HAVE_GCD
return dispatch_semaphore_signal((dispatch_semaphore_t)s);
#elif !defined(ENABLE_PTHREAD_SUPPORT)
heim_assert(0, "no semaphore support w/o pthreads");
return EINVAL;
#else
int wakeup;
HEIMDAL_MUTEX_lock(&s->mutex);
wakeup = (++s->counter == 0) ;
HEIMDAL_MUTEX_unlock(&s->mutex);
if (wakeup)
pthread_cond_signal(&s->cond);
return 0;
#endif
}
void
heim_ipc_semaphore_release(heim_isemaphore s)
{
#ifdef HAVE_GCD
dispatch_release((dispatch_semaphore_t)s);
#elif !defined(ENABLE_PTHREAD_SUPPORT)
heim_assert(0, "no semaphore support w/o pthreads");
#else
HEIMDAL_MUTEX_lock(&s->mutex);
if (s->counter != 0)
abort();
HEIMDAL_MUTEX_unlock(&s->mutex);
HEIMDAL_MUTEX_destroy(&s->mutex);
pthread_cond_destroy(&s->cond);
free(s);
#endif
}
void
heim_ipc_free_data(heim_idata *data)
{
if (data->data)
free(data->data);
data->data = NULL;
data->length = 0;
}
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