/* Test for sched_getaffinity and sched_setaffinity, PID version.

   Copyright (C) 2015-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* Function definitions for the benefit of tst-skeleton-affinity.c.

   This variant forks a child process which then invokes

   sched_getaffinity and sched_setaffinity on the parent PID.  */

#include <errno.h>

#include <stdlib.h>

#include <sched.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/wait.h>

#include <unistd.h>

static int

write_fully (int fd, const void *buffer, size_t length)

{

  const void *end = buffer + length;

  while (buffer < end)

    {

      ssize_t bytes_written = TEMP_FAILURE_RETRY

        (write (fd, buffer, end - buffer));

      if (bytes_written < 0)

        return -1;

      if (bytes_written == 0)

        {

          errno = ENOSPC;

          return -1;

        }

      buffer += bytes_written;

    }

  return 0;

}

static ssize_t

read_fully (int fd, void *buffer, size_t length)

{

  const void *start = buffer;

  const void *end = buffer + length;

  while (buffer < end)

    {

      ssize_t bytes_read = TEMP_FAILURE_RETRY

        (read (fd, buffer, end - buffer));

      if (bytes_read < 0)

        return -1;

      if (bytes_read == 0)

        return buffer - start;

      buffer += bytes_read;

    }

  return length;

}

static int

process_child_response (int *pipes, pid_t child,

                        cpu_set_t *set, size_t size)

{

  close (pipes[1]);

  int value_from_child;

  ssize_t bytes_read = read_fully

    (pipes[0], &value_from_child, sizeof (value_from_child));

  if (bytes_read < 0)

    {

      printf ("error: read from child: %m\n");

      exit (1);

    }

  if (bytes_read != sizeof (value_from_child))

    {

      printf ("error: not enough bytes from child: %zd\n", bytes_read);

      exit (1);

    }

  if (value_from_child == 0)

    {

      bytes_read = read_fully (pipes[0], set, size);

      if (bytes_read < 0)

        {

          printf ("error: read: %m\n");

          exit (1);

        }

      if (bytes_read != size)

        {

          printf ("error: not enough bytes from child: %zd\n", bytes_read);

          exit (1);

        }

    }

  int status;

  if (waitpid (child, &status, 0) < 0)

    {

      printf ("error: waitpid: %m\n");

      exit (1);

    }

  if (!(WIFEXITED (status) && WEXITSTATUS (status) == 0))

    {

      printf ("error: invalid status from : %m\n");

      exit (1);

    }

  close (pipes[0]);

  if (value_from_child != 0)

    {

      errno = value_from_child;

      return -1;

    }

  return 0;

}

static int

getaffinity (size_t size, cpu_set_t *set)

{

  int pipes[2];

  if (pipe (pipes) < 0)

    {

      printf ("error: pipe: %m\n");

      exit (1);

    }

  int ret = fork ();

  if (ret < 0)

    {

      printf ("error: fork: %m\n");

      exit (1);

    }

  if (ret == 0)

    {

      /* Child.  */

      int ret = sched_getaffinity (getppid (), size, set);

      if (ret < 0)

        ret = errno;

      if (write_fully (pipes[1], &ret, sizeof (ret)) < 0

          || write_fully (pipes[1], set, size) < 0

          || (ret == 0 && write_fully (pipes[1], set, size) < 0))

        {

          printf ("error: write: %m\n");

          _exit (1);

        }

      _exit (0);

    }

  /* Parent.  */

  return process_child_response (pipes, ret, set, size);

}

static int

setaffinity (size_t size, const cpu_set_t *set)

{

  int pipes[2];

  if (pipe (pipes) < 0)

    {

      printf ("error: pipe: %m\n");

      exit (1);

    }

  int ret = fork ();

  if (ret < 0)

    {

      printf ("error: fork: %m\n");

      exit (1);

    }

  if (ret == 0)

    {

      /* Child.  */

      int ret = sched_setaffinity (getppid (), size, set);

      if (write_fully (pipes[1], &ret, sizeof (ret)) < 0)

        {

          printf ("error: write: %m\n");

          _exit (1);

        }

      _exit (0);

    }

  /* Parent.  There is no affinity mask to read from the child, so the

     size is 0.  */

  return process_child_response (pipes, ret, NULL, 0);

}

struct conf;

static bool early_test (struct conf *unused)

{

  return true;

}

#include "tst-skeleton-affinity.c"