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80 lines
2.4 KiB
80 lines
2.4 KiB
9 years ago
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/*
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Copyright (c) 2012-2013 Martin Sustrik All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom
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the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#include "err.h"
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#include "int.h"
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#include "closefd.h"
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#include <sys/eventfd.h>
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#include <unistd.h>
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#include <fcntl.h>
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int nn_efd_init(struct nn_efd *self)
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{
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int rc;
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int flags;
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//PostMessage("inside efd_init eventfd\n");
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self->efd = eventfd(0, EFD_CLOEXEC);
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//PostMessage("self->efd: %d\n",self->efd);
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if (self->efd == -1 && (errno == EMFILE || errno == ENFILE))
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return -EMFILE;
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errno_assert(self->efd != -1);
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flags = fcntl(self->efd,F_GETFL,0);
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//PostMessage("fcntl flags: %d\n",flags);
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if ( flags == -1 )
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flags = 0;
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rc = fcntl(self->efd, F_SETFL, flags | O_NONBLOCK);
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//PostMessage("fcntl rc: %d\n",rc);
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errno_assert (rc != -1);
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return 0;
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}
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void nn_efd_term (struct nn_efd *self)
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{
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nn_closefd (self->efd);
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}
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nn_fd nn_efd_getfd (struct nn_efd *self)
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{
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return self->efd;
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}
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void nn_efd_signal (struct nn_efd *self)
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{
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const uint64_t one = 1;
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ssize_t nbytes;
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nbytes = write (self->efd, &one, sizeof (one));
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errno_assert (nbytes == sizeof (one));
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}
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void nn_efd_unsignal (struct nn_efd *self)
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{
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uint64_t count;
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/* Extract all the signals from the eventfd. */
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ssize_t sz = read (self->efd, &count, sizeof (count));
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errno_assert (sz >= 0);
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nn_assert (sz == sizeof (count));
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}
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