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/*
*
* Copyright 2015, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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 "src/core/lib/iomgr/port.h"
#ifdef GRPC_POSIX_WAKEUP_FD
#include "src/core/lib/iomgr/wakeup_fd_posix.h"
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <grpc/support/log.h>
#include "src/core/lib/iomgr/socket_utils_posix.h"
static grpc_error* pipe_init(grpc_wakeup_fd* fd_info) {
int pipefd[2];
int r = pipe(pipefd);
if (0 != r) {
gpr_log(GPR_ERROR, "pipe creation failed (%d): %s", errno, strerror(errno));
return GRPC_OS_ERROR(errno, "pipe");
}
grpc_error* err;
err = grpc_set_socket_nonblocking(pipefd[0], 1);
if (err != GRPC_ERROR_NONE) return err;
err = grpc_set_socket_nonblocking(pipefd[1], 1);
if (err != GRPC_ERROR_NONE) return err;
fd_info->read_fd = pipefd[0];
fd_info->write_fd = pipefd[1];
return GRPC_ERROR_NONE;
}
static grpc_error* pipe_consume(grpc_wakeup_fd* fd_info) {
char buf[128];
ssize_t r;
for (;;) {
r = read(fd_info->read_fd, buf, sizeof(buf));
if (r > 0) continue;
if (r == 0) return GRPC_ERROR_NONE;
switch (errno) {
case EAGAIN:
return GRPC_ERROR_NONE;
case EINTR:
continue;
default:
return GRPC_OS_ERROR(errno, "read");
}
}
}
static grpc_error* pipe_wakeup(grpc_wakeup_fd* fd_info) {
char c = 0;
while (write(fd_info->write_fd, &c, 1) != 1 && errno == EINTR)
;
return GRPC_ERROR_NONE;
}
static void pipe_destroy(grpc_wakeup_fd* fd_info) {
if (fd_info->read_fd != 0) close(fd_info->read_fd);
if (fd_info->write_fd != 0) close(fd_info->write_fd);
}
static int pipe_check_availability(void) {
grpc_wakeup_fd fd;
fd.read_fd = fd.write_fd = -1;
if (pipe_init(&fd) == GRPC_ERROR_NONE) {
pipe_destroy(&fd);
return 1;
} else {
return 0;
}
}
const grpc_wakeup_fd_vtable grpc_pipe_wakeup_fd_vtable = {
pipe_init, pipe_consume, pipe_wakeup, pipe_destroy,
pipe_check_availability};
#endif /* GPR_POSIX_WAKUP_FD */
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