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author | David 'Digit' Turner <digit@google.com> | 2011-09-16 17:11:49 +0200 |
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committer | David 'Digit' Turner <digit@google.com> | 2011-09-16 17:11:49 +0200 |
commit | 33fddf0ca9801080472116654264be63a21b6e80 (patch) | |
tree | 218bb976052e48d7ba5c77111d20e91f3ba403d3 | |
parent | cd347fdf74d5f2e0af856455c514e655f40a6fdb (diff) | |
download | libhardware-33fddf0ca9801080472116654264be63a21b6e80.tar.gz |
emulator: Add <hardware/qemu_pipe.h> headerandroid-cts-2.3_r12android-cts-2.3_r11android-cts-2.3_r10gingerbread
This header is required by our GLES emulation guest code to be able
to access the emulator services provided through the /dev/qemu_pipe
special device.
Change-Id: Ia9782256048d7340237f3e1d18d7452dd815e561
-rw-r--r-- | include/hardware/qemu_pipe.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/include/hardware/qemu_pipe.h b/include/hardware/qemu_pipe.h new file mode 100644 index 00000000..1a67022b --- /dev/null +++ b/include/hardware/qemu_pipe.h @@ -0,0 +1,91 @@ +/* + * 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 + +/* 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 */ |