1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <log/log.h>
19 #include <sys/types.h>
20 #include <fcntl.h>
21 #include <stdint.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <unistd.h>
25 #include <qemu_pipe_bp.h>
26
27 namespace {
open_verbose(const char * name,int flags)28 int open_verbose(const char* name, int flags) {
29 const int fd = QEMU_PIPE_RETRY(open(name, flags));
30 if (fd < 0) {
31 ALOGE("%s:%d: Could not open '%s': %s",
32 __func__, __LINE__, name, strerror(errno));
33 }
34 return fd;
35 }
36
37 } // namespace
38
39 extern "C" {
40
qemu_pipe_open_ns(const char * ns,const char * pipeName,int flags)41 int qemu_pipe_open_ns(const char* ns, const char* pipeName, int flags) {
42 if (pipeName == NULL || pipeName[0] == '\0') {
43 errno = EINVAL;
44 return -1;
45 }
46
47 const int fd = open_verbose("/dev/goldfish_pipe", flags);
48 if (fd < 0) {
49 return fd;
50 }
51
52 char buf[256];
53 int bufLen;
54 if (ns) {
55 bufLen = snprintf(buf, sizeof(buf), "pipe:%s:%s", ns, pipeName);
56 } else {
57 bufLen = snprintf(buf, sizeof(buf), "pipe:%s", pipeName);
58 }
59
60 if (qemu_pipe_write_fully(fd, buf, bufLen + 1)) {
61 ALOGE("%s:%d: Could not connect to the '%s' service: %s",
62 __func__, __LINE__, buf, strerror(errno));
63 return -1;
64 }
65
66 return fd;
67 }
68
qemu_pipe_open(const char * pipeName)69 int qemu_pipe_open(const char* pipeName) {
70 return qemu_pipe_open_ns(NULL, pipeName, O_RDWR | O_NONBLOCK);
71 }
72
qemu_pipe_close(int pipe)73 void qemu_pipe_close(int pipe) {
74 close(pipe);
75 }
76
qemu_pipe_read(int pipe,void * buffer,int size)77 int qemu_pipe_read(int pipe, void* buffer, int size) {
78 return read(pipe, buffer, size);
79 }
80
qemu_pipe_write(int pipe,const void * buffer,int size)81 int qemu_pipe_write(int pipe, const void* buffer, int size) {
82 return write(pipe, buffer, size);
83 }
84
qemu_pipe_try_again(int ret)85 int qemu_pipe_try_again(int ret) {
86 return (ret < 0) && (errno == EINTR || errno == EAGAIN);
87 }
88
qemu_pipe_print_error(int pipe)89 void qemu_pipe_print_error(int pipe) {
90 ALOGE("pipe error: fd %d errno %d", pipe, errno);
91 }
92
93 } // extern "C"
94