| /* |
| * |
| * 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 <grpc/support/port_platform.h> |
| |
| #ifdef GPR_POSIX_WAKEUP_FD |
| |
| #include "src/core/iomgr/wakeup_fd_posix.h" |
| |
| #include <errno.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "src/core/iomgr/socket_utils_posix.h" |
| #include <grpc/support/log.h> |
| |
| static void pipe_init(grpc_wakeup_fd* fd_info) { |
| int pipefd[2]; |
| /* TODO(klempner): Make this nonfatal */ |
| GPR_ASSERT(0 == pipe(pipefd)); |
| GPR_ASSERT(grpc_set_socket_nonblocking(pipefd[0], 1)); |
| GPR_ASSERT(grpc_set_socket_nonblocking(pipefd[1], 1)); |
| fd_info->read_fd = pipefd[0]; |
| fd_info->write_fd = pipefd[1]; |
| } |
| |
| static void 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; |
| switch (errno) { |
| case EAGAIN: |
| return; |
| case EINTR: |
| continue; |
| default: |
| gpr_log(GPR_ERROR, "error reading pipe: %s", strerror(errno)); |
| return; |
| } |
| } |
| } |
| |
| static void pipe_wakeup(grpc_wakeup_fd* fd_info) { |
| char c = 0; |
| while (write(fd_info->write_fd, &c, 1) != 1 && errno == EINTR) |
| ; |
| } |
| |
| 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) { |
| /* Assume that pipes are always available. */ |
| return 1; |
| } |
| |
| 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 */ |