diff options
Diffstat (limited to 'lib/librt/mq.c')
| -rw-r--r-- | lib/librt/mq.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/lib/librt/mq.c b/lib/librt/mq.c new file mode 100644 index 0000000..750e969 --- /dev/null +++ b/lib/librt/mq.c @@ -0,0 +1,280 @@ +/*- + * Copyright (c) 2006 David Xu <davidxu@freebsd.org> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +#include <sys/types.h> +#include <sys/syscall.h> +#include <sys/mqueue.h> + +#include "namespace.h" +#include <errno.h> +#include <pthread.h> +#include <stddef.h> +#include <stdlib.h> +#include <signal.h> +#include "sigev_thread.h" +#include "un-namespace.h" +#include "libc_private.h" + +extern int __sys_kmq_notify(int, const struct sigevent *); +extern int __sys_kmq_open(const char *, int, mode_t, + const struct mq_attr *); +extern int __sys_kmq_setattr(int, const struct mq_attr *__restrict, + struct mq_attr *__restrict); +extern ssize_t __sys_kmq_timedreceive(int, char *__restrict, size_t, + unsigned *__restrict, const struct timespec *__restrict); +extern int __sys_kmq_timedsend(int, const char *, size_t, unsigned, + const struct timespec *); +extern int __sys_kmq_unlink(const char *); +extern int __sys_close(int fd); + +struct __mq { + int oshandle; + struct sigev_node *node; +}; + +__weak_reference(__mq_open, mq_open); +__weak_reference(__mq_open, _mq_open); +__weak_reference(__mq_close, mq_close); +__weak_reference(__mq_close, _mq_close); +__weak_reference(__mq_notify, mq_notify); +__weak_reference(__mq_notify, _mq_notify); +__weak_reference(__mq_getattr, mq_getattr); +__weak_reference(__mq_getattr, _mq_getattr); +__weak_reference(__mq_setattr, mq_setattr); +__weak_reference(__mq_setattr, _mq_setattr); +__weak_reference(__mq_timedreceive_cancel, mq_timedreceive); +__weak_reference(__mq_timedreceive, _mq_timedreceive); +__weak_reference(__mq_timedsend_cancel, mq_timedsend); +__weak_reference(__mq_timedsend, _mq_timedsend); +__weak_reference(__mq_unlink, mq_unlink); +__weak_reference(__mq_unlink, _mq_unlink); +__weak_reference(__mq_send_cancel, mq_send); +__weak_reference(__mq_send, _mq_send); +__weak_reference(__mq_receive_cancel, mq_receive); +__weak_reference(__mq_receive, _mq_receive); + +mqd_t +__mq_open(const char *name, int oflag, mode_t mode, + const struct mq_attr *attr) +{ + struct __mq *mq; + int err; + + mq = malloc(sizeof(struct __mq)); + if (mq == NULL) + return (NULL); + + mq->oshandle = __sys_kmq_open(name, oflag, mode, attr); + if (mq->oshandle != -1) { + mq->node = NULL; + return (mq); + } + err = errno; + free(mq); + errno = err; + return ((mqd_t)-1L); +} + +int +__mq_close(mqd_t mqd) +{ + int h; + + if (mqd->node != NULL) { + __sigev_list_lock(); + __sigev_delete_node(mqd->node); + __sigev_list_unlock(); + } + h = mqd->oshandle; + free(mqd); + return (__sys_close(h)); +} + +typedef void (*mq_func)(union sigval val); + +static void +mq_dispatch(struct sigev_node *sn) +{ + mq_func f = sn->sn_func; + + /* + * Check generation before calling user function, + * this should avoid expired notification. + */ + if (sn->sn_gen == sn->sn_info.si_value.sival_int) + f(sn->sn_value); +} + +int +__mq_notify(mqd_t mqd, const struct sigevent *evp) +{ + struct sigevent ev; + struct sigev_node *sn; + int ret; + + if (evp == NULL || evp->sigev_notify != SIGEV_THREAD) { + if (mqd->node != NULL) { + __sigev_list_lock(); + __sigev_delete_node(mqd->node); + mqd->node = NULL; + __sigev_list_unlock(); + } + return __sys_kmq_notify(mqd->oshandle, evp); + } + + if (__sigev_check_init()) { + /* + * Thread library is not enabled. + */ + errno = EINVAL; + return (-1); + } + + sn = __sigev_alloc(SI_MESGQ, evp, mqd->node, 1); + if (sn == NULL) { + errno = EAGAIN; + return (-1); + } + + sn->sn_id = mqd->oshandle; + sn->sn_dispatch = mq_dispatch; + __sigev_get_sigevent(sn, &ev, sn->sn_gen); + __sigev_list_lock(); + if (mqd->node != NULL) + __sigev_delete_node(mqd->node); + mqd->node = sn; + __sigev_register(sn); + ret = __sys_kmq_notify(mqd->oshandle, &ev); + __sigev_list_unlock(); + return (ret); +} + +int +__mq_getattr(mqd_t mqd, struct mq_attr *attr) +{ + + return __sys_kmq_setattr(mqd->oshandle, NULL, attr); +} + +int +__mq_setattr(mqd_t mqd, const struct mq_attr *newattr, struct mq_attr *oldattr) +{ + + return __sys_kmq_setattr(mqd->oshandle, newattr, oldattr); +} + +ssize_t +__mq_timedreceive(mqd_t mqd, char *buf, size_t len, + unsigned *prio, const struct timespec *timeout) +{ + + return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout); +} + +ssize_t +__mq_timedreceive_cancel(mqd_t mqd, char *buf, size_t len, + unsigned *prio, const struct timespec *timeout) +{ + int ret; + + _pthread_cancel_enter(1); + ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, timeout); + _pthread_cancel_leave(ret == -1); + return (ret); +} + +ssize_t +__mq_receive(mqd_t mqd, char *buf, size_t len, unsigned *prio) +{ + + return __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL); +} + +ssize_t +__mq_receive_cancel(mqd_t mqd, char *buf, size_t len, unsigned *prio) +{ + int ret; + + _pthread_cancel_enter(1); + ret = __sys_kmq_timedreceive(mqd->oshandle, buf, len, prio, NULL); + _pthread_cancel_leave(ret == -1); + return (ret); +} +ssize_t +__mq_timedsend(mqd_t mqd, char *buf, size_t len, + unsigned prio, const struct timespec *timeout) +{ + + return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout); +} + +ssize_t +__mq_timedsend_cancel(mqd_t mqd, char *buf, size_t len, + unsigned prio, const struct timespec *timeout) +{ + int ret; + + _pthread_cancel_enter(1); + ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, timeout); + _pthread_cancel_leave(ret == -1); + return (ret); +} + +ssize_t +__mq_send(mqd_t mqd, char *buf, size_t len, unsigned prio) +{ + + return __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL); +} + + +ssize_t +__mq_send_cancel(mqd_t mqd, char *buf, size_t len, unsigned prio) +{ + int ret; + + _pthread_cancel_enter(1); + ret = __sys_kmq_timedsend(mqd->oshandle, buf, len, prio, NULL); + _pthread_cancel_leave(ret == -1); + return (ret); +} + +int +__mq_unlink(const char *path) +{ + + return __sys_kmq_unlink(path); +} + +int +__mq_oshandle(mqd_t mqd) +{ + + return (mqd->oshandle); +} |
