Merge "Switch to bionic's pidfd_open."

#include <string.h>

#include <sys/epoll.h>

#include <sys/errno.h>

#include <sys/pidfd.h>

#include <sys/resource.h>

#include <sys/stat.h>

#include <sys/syscall.h>

    return removeAllProcessGroups();

}

// Wrapper function to the syscall pidfd_open, which creates a file

// descriptor that refers to the process whose PID is specified in pid.

static inline int sys_pidfd_open(pid_t pid, unsigned int flags) {

    return syscall(__NR_pidfd_open, pid, flags);

}

static jint android_os_Process_nativePidFdOpen(JNIEnv* env, jobject, jint pid, jint flags) {

    int fd = sys_pidfd_open(pid, flags);

    int fd = pidfd_open(pid, flags);

    if (fd < 0) {

        jniThrowErrnoException(env, "nativePidFdOpen", errno);

        return -1;