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Merge "Don't write to /sys/class/android_usb/android0/enable with configfs."

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This commit is contained in:
Tao Bao 2017-05-12 01:18:50 +00:00 committed by Gerrit Code Review
commit 7cb1b79673
1 changed files with 16 additions and 7 deletions
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23
adb_install.cpp
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@ -26,7 +26,10 @@
#include <sys/wait.h>
#include <unistd.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/unique_fd.h>
#include "common.h"
#include "fuse_sideload.h"
@ -34,16 +37,22 @@
#include "ui.h"
static void set_usb_driver(bool enabled) {
int fd = open("/sys/class/android_usb/android0/enable", O_WRONLY);
if (fd < 0) {
ui->Print("failed to open driver control: %s\n", strerror(errno));
// USB configfs doesn't use /s/c/a/a/enable.
if (android::base::GetBoolProperty("sys.usb.configfs", false)) {
return;
}
if (TEMP_FAILURE_RETRY(write(fd, enabled ? "1" : "0", 1)) == -1) {
ui->Print("failed to set driver control: %s\n", strerror(errno));
static constexpr const char* USB_DRIVER_CONTROL = "/sys/class/android_usb/android0/enable";
android::base::unique_fd fd(open(USB_DRIVER_CONTROL, O_WRONLY));
if (fd == -1) {
PLOG(ERROR) << "Failed to open driver control";
return;
}
if (close(fd) < 0) {
ui->Print("failed to close driver control: %s\n", strerror(errno));
// Not using android::base::WriteStringToFile since that will open with O_CREAT and give EPERM
// when USB_DRIVER_CONTROL doesn't exist. When it gives EPERM, we don't know whether that's due
// to non-existent USB_DRIVER_CONTROL or indeed a permission issue.
if (!android::base::WriteStringToFd(enabled ? "1" : "0", fd)) {
PLOG(ERROR) << "Failed to set driver control";
}
}