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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_POSIX_WAKEUP_FD
#include "src/core/lib/iomgr/wakeup_fd_pipe.h"
#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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