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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.
//
// StdRedirect.c
//
// Used for controlling stdin, stdout, stderr of iOS Applications launched in the simulator
// using simctl. stdin, stdout, and stderr are set using environment variables.
//
// To use:
//
// export GSTDIN="PATH_TO_STD_IN"
// export GSTDOUT="PATH_TO_STD_OUT"
// export GSTDERR="PATH_TO_STD_ERR"
// PLATFORM_PATH="$($(xcrun --sdk iphonesimulator --show-sdk-platform-path)"
// export SIMCTL_CHILD_DYLD_FALLBACK_FRAMEWORK_PATH="$PLATFORM_PATH/Developer/Library/Frameworks"
// export SIMCTL_CHILD_DYLD_INSERT_LIBRARIES="$PLATFORM_PATH/Developer/Library/PrivateFrameworks" \
// "/IDEBundleInjection.framework/IDEBundleInjection:<Full path to StdRedirect.dylib>"
// export SIMCTL_CHILD_XCInjectBundle="Full path to your *.xctest Bundle"
// export SIMCTL_CHILD_XCInjectBundleInto="Full path to your app binary inside of " \
// "~/Library/Developer/CoreSimulator/Devices"
// <Launch the simulator in some fashion>
// xcrun simctl launch booted <device> <app binary bundle ID> -XCTest All
// Note that all of GSTDIN/GSTDOUT/GSTDERR are optional. Xcode dumps test results to GSTDERR.
// For a practical example of using it see run_tests.sh
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <sys/stat.h>
#include <unistd.h>
// Using __assert_rtn to log asserts because it has the side benefit of
// putting data in the CrashReport logs which would be useful.
// __assert_rtn is a somewhat "private" api.
// Since we are going to "assert" anyway, we ignore leaks from asprintf.
static void SetUpStdFileDescriptor(const char *env_name, int file_no) {
const char *path = getenv(env_name);
if (path) {
int fd = open(path, O_RDWR | O_CREAT | O_APPEND);
if (fd == -1) {
char *crash_log_message;
asprintf(&crash_log_message, "Could not open %s for %s - %s",
env_name, path, strerror(errno));
__assert_rtn(__func__, __FILE__, __LINE__, crash_log_message);
} else {
if (fchmod(fd, 0666) == -1) {
char *crash_log_message;
asprintf(&crash_log_message, "Could not chmod %s for %s - %s",
env_name, path, strerror(errno));
__assert_rtn(__func__, __FILE__, __LINE__, crash_log_message);
}
if (dup2(fd, file_no) == -1) {
char *crash_log_message;
asprintf(&crash_log_message, "Could not dup %s for %s - %s",
env_name, path, strerror(errno));
__assert_rtn(__func__, __FILE__, __LINE__, crash_log_message);
}
}
}
}
__attribute__((constructor)) static void SetUpStdFileDescriptors() {
// Set up Error first with the hope that if out/in fail, that at least
// we will get errors logged.
SetUpStdFileDescriptor("GSTDERR", STDERR_FILENO);
SetUpStdFileDescriptor("GSTDOUT", STDOUT_FILENO);
SetUpStdFileDescriptor("GSTDIN", STDIN_FILENO);
}
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