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- /*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * 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.
- */
- #ifndef ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
- #define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
- #include <sys/cdefs.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <sys/mman.h>
- #include <pthread.h> /* for pthread_once() */
- #include <stdlib.h>
- #include <stdio.h>
- #include <errno.h>
- #ifndef D
- # define D(...) do{}while(0)
- #endif
- /*
- * TEMP_FAILURE_RETRY is defined by some, but not all, versions of
- * <unistd.h>. (Alas, it is not as standard as we'd hoped!) So, if it's
- * not already defined, then define it here.
- */
- #ifndef TEMP_FAILURE_RETRY
- /* Used to retry syscalls that can return EINTR. */
- #define TEMP_FAILURE_RETRY(exp) ({ \
- typeof (exp) _rc; \
- do { \
- _rc = (exp); \
- } while (_rc == -1 && errno == EINTR); \
- _rc; })
- #endif
- /* Try to open a new Qemu fast-pipe. This function returns a file descriptor
- * that can be used to communicate with a named service managed by the
- * emulator.
- *
- * This file descriptor can be used as a standard pipe/socket descriptor.
- *
- * 'pipeName' is the name of the emulator service you want to connect to.
- * E.g. 'opengles' or 'camera'.
- *
- * On success, return a valid file descriptor
- * Returns -1 on error, and errno gives the error code, e.g.:
- *
- * EINVAL -> unknown/unsupported pipeName
- * ENOSYS -> fast pipes not available in this system.
- *
- * ENOSYS should never happen, except if you're trying to run within a
- * misconfigured emulator.
- *
- * You should be able to open several pipes to the same pipe service,
- * except for a few special cases (e.g. GSM modem), where EBUSY will be
- * returned if more than one client tries to connect to it.
- */
- static __inline__ int
- qemu_pipe_open(const char* pipeName)
- {
- char buff[256];
- int buffLen;
- int fd, ret;
- if (pipeName == NULL || pipeName[0] == '\0') {
- errno = EINVAL;
- return -1;
- }
- snprintf(buff, sizeof buff, "pipe:%s", pipeName);
- fd = open("/dev/qemu_pipe", O_RDWR);
- if (fd < 0) {
- D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
- //errno = ENOSYS;
- return -1;
- }
- buffLen = strlen(buff);
- ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1));
- if (ret != buffLen+1) {
- D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
- if (ret == 0) {
- errno = ECONNRESET;
- } else if (ret > 0) {
- errno = EINVAL;
- }
- return -1;
- }
- return fd;
- }
- #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */
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