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109 lines
3.0 KiB
109 lines
3.0 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 "fast.h"
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#include "int.h"
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#include "closefd.h"
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#include <sys/types.h>
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#include <sys/socket.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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int p [2];
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//PostMessage("inside efd_init: pipe\n");
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#if defined NN_HAVE_PIPE2
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rc = pipe2(p, O_NONBLOCK | O_CLOEXEC);
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#else
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rc = pipe(p);
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#endif
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//PostMessage("rc efd_init: %d\n",rc);
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if (rc != 0 && (errno == EMFILE || errno == ENFILE))
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return -EMFILE;
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errno_assert (rc == 0);
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self->r = p[0];
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self->w = p[1];
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#if !defined NN_HAVE_PIPE2 && defined FD_CLOEXEC
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rc = fcntl (self->r, F_SETFD, FD_CLOEXEC);
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//PostMessage("pipe efd_init: F_SETFDr rc %d\n",rc);
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errno_assert(rc != -1);
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rc = fcntl(self->w, F_SETFD, FD_CLOEXEC);
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//PostMessage("pipe efd_init: F_SETFDw rc %d\n",rc);
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errno_assert(rc != -1);
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#endif
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#if !defined NN_HAVE_PIPE2
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flags = fcntl(self->r, F_GETFL, 0);
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//PostMessage("pipe efd_init: flags %d\n",flags);
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if ( flags == -1 )
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flags = 0;
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rc = fcntl(self->r, F_SETFL, flags | O_NONBLOCK);
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//PostMessage("pipe efd_init: rc %d flags.%d\n",rc,flags);
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errno_assert (rc != -1);
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#endif
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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->r);
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nn_closefd (self->w);
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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->r;
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}
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void nn_efd_signal (struct nn_efd *self)
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{
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ssize_t nbytes;
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char c = 101;
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nbytes = write (self->w, &c, 1);
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errno_assert (nbytes != -1);
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nn_assert (nbytes == 1);
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}
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void nn_efd_unsignal (struct nn_efd *self)
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{
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ssize_t nbytes;
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uint8_t buf [16];
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while (1) {
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nbytes = read (self->r, buf, sizeof (buf));
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if (nbytes < 0 && errno == EAGAIN)
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nbytes = 0;
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errno_assert (nbytes >= 0);
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if (nn_fast ((size_t) nbytes < sizeof (buf)))
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break;
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}
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}
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