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am ccac2be8: Merge "init: use SELinux /dev/null if available"

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* commit 'ccac2be8a6269469087a7978e1a6db62ef4618c6':
  init: use SELinux /dev/null if available
This commit is contained in:
Nick Kralevich 2015-04-26 01:30:43 +00:00 committed by Android Git Automerger
commit 45a49d0eb7
1 changed files with 19 additions and 14 deletions
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33
init/util.cpp
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@ -379,23 +379,28 @@ int wait_for_file(const char *filename, int timeout)
void open_devnull_stdio(void)
{
int fd;
static const char *name = "/dev/__null__";
if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
fd = open(name, O_RDWR);
unlink(name);
if (fd >= 0) {
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2) {
close(fd);
}
return;
// Try to avoid the mknod() call if we can. Since SELinux makes
// a /dev/null replacement available for free, let's use it.
int fd = open("/sys/fs/selinux/null", O_RDWR);
if (fd == -1) {
// OOPS, /sys/fs/selinux/null isn't available, likely because
// /sys/fs/selinux isn't mounted. Fall back to mknod.
static const char *name = "/dev/__null__";
if (mknod(name, S_IFCHR | 0600, (1 << 8) | 3) == 0) {
fd = open(name, O_RDWR);
unlink(name);
}
if (fd == -1) {
exit(1);
}
}
exit(1);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2) {
close(fd);
}
}
void import_kernel_cmdline(int in_qemu,