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glibc/sysdeps/unix/sysv/linux/tst-affinity-pid.c
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/* Test for sched_getaffinity and sched_setaffinity, PID version. | |
Copyright (C) 2015-2016 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" |