blob: 017017f97649553beeecdfc9513373345d72ba17 [file] [log] [blame]
/*
Copyright (c) 2012-2013 Martin Sustrik All rights reserved.
Copyright 2015 Garrett D'Amore <garrett@damore.org>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom
the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
*/
#include "err.h"
#include "fast.h"
#include "closefd.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdint.h>
int nn_efd_init (struct nn_efd *self)
{
int rc;
int flags;
int sp [2];
#if defined SOCK_CLOEXEC
rc = socketpair (AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sp);
#else
rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sp);
#endif
if (rc != 0 && (errno == EMFILE || errno == ENFILE))
return -EMFILE;
errno_assert (rc == 0);
self->r = sp [0];
self->w = sp [1];
#if !defined SOCK_CLOEXEC && defined FD_CLOEXEC
rc = fcntl (self->r, F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
rc = fcntl (self->w, F_SETFD, FD_CLOEXEC);
errno_assert (rc != -1);
#endif
flags = fcntl (self->r, F_GETFL, 0);
if (flags == -1)
flags = 0;
rc = fcntl (self->r, F_SETFL, flags | O_NONBLOCK);
errno_assert (rc != -1);
return 0;
}
void nn_efd_stop (struct nn_efd *self)
{
int fd = self->w;
self->w = -1;
nn_closefd (fd);
}
void nn_efd_term (struct nn_efd *self)
{
int fd = self->r;
self->r = -1;
nn_closefd (fd);
fd = self->w;
self->w = -1;
nn_closefd (fd);
}
nn_fd nn_efd_getfd (struct nn_efd *self)
{
return self->r;
}
void nn_efd_signal (struct nn_efd *self)
{
ssize_t nbytes;
char c = 101;
int fd = self->w;
if (nn_slow (fd < 0))
return;
#if defined MSG_NOSIGNAL
nbytes = send (fd, &c, 1, MSG_NOSIGNAL);
#else
nbytes = send (fd, &c, 1, 0);
#endif
errno_assert (nbytes != -1);
nn_assert (nbytes == 1);
}
void nn_efd_unsignal (struct nn_efd *self)
{
ssize_t nbytes;
uint8_t buf [16];
while (1) {
int fd = self->r;
if (nn_slow (fd < 0))
return;
nbytes = recv (self->r, buf, sizeof (buf), 0);
if (nbytes < 0 && errno == EAGAIN)
nbytes = 0;
errno_assert (nbytes >= 0);
if (nn_fast (nbytes < sizeof (buf)))
break;
}
}