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Diffstat (limited to 'sysdeps/unix/sysv/linux/getsysstats.c')
-rw-r--r--sysdeps/unix/sysv/linux/getsysstats.c330
1 files changed, 0 insertions, 330 deletions
diff --git a/sysdeps/unix/sysv/linux/getsysstats.c b/sysdeps/unix/sysv/linux/getsysstats.c
deleted file mode 100644
index 63e41100eb..0000000000
--- a/sysdeps/unix/sysv/linux/getsysstats.c
+++ /dev/null
@@ -1,330 +0,0 @@
-/* Determine various system internal values, Linux version.
- Copyright (C) 1996-2017 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
-
- 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/>. */
-
-#include <alloca.h>
-#include <assert.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <mntent.h>
-#include <paths.h>
-#include <stdio.h>
-#include <stdio_ext.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/sysinfo.h>
-
-#include <atomic.h>
-#include <not-cancel.h>
-
-
-/* How we can determine the number of available processors depends on
- the configuration. There is currently (as of version 2.0.21) no
- system call to determine the number. It is planned for the 2.1.x
- series to add this, though.
-
- One possibility to implement it for systems using Linux 2.0 is to
- examine the pseudo file /proc/cpuinfo. Here we have one entry for
- each processor.
-
- But not all systems have support for the /proc filesystem. If it
- is not available we simply return 1 since there is no way. */
-
-
-/* Other architectures use different formats for /proc/cpuinfo. This
- provides a hook for alternative parsers. */
-#ifndef GET_NPROCS_PARSER
-# define GET_NPROCS_PARSER(FD, BUFFER, CP, RE, BUFFER_END, RESULT) \
- do \
- { \
- (RESULT) = 0; \
- /* Read all lines and count the lines starting with the string \
- "processor". We don't have to fear extremely long lines since \
- the kernel will not generate them. 8192 bytes are really \
- enough. */ \
- char *l; \
- while ((l = next_line (FD, BUFFER, &CP, &RE, BUFFER_END)) != NULL) \
- if (strncmp (l, "processor", 9) == 0) \
- ++(RESULT); \
- } \
- while (0)
-#endif
-
-
-static char *
-next_line (int fd, char *const buffer, char **cp, char **re,
- char *const buffer_end)
-{
- char *res = *cp;
- char *nl = memchr (*cp, '\n', *re - *cp);
- if (nl == NULL)
- {
- if (*cp != buffer)
- {
- if (*re == buffer_end)
- {
- memmove (buffer, *cp, *re - *cp);
- *re = buffer + (*re - *cp);
- *cp = buffer;
-
- ssize_t n = read_not_cancel (fd, *re, buffer_end - *re);
- if (n < 0)
- return NULL;
-
- *re += n;
-
- nl = memchr (*cp, '\n', *re - *cp);
- while (nl == NULL && *re == buffer_end)
- {
- /* Truncate too long lines. */
- *re = buffer + 3 * (buffer_end - buffer) / 4;
- n = read_not_cancel (fd, *re, buffer_end - *re);
- if (n < 0)
- return NULL;
-
- nl = memchr (*re, '\n', n);
- **re = '\n';
- *re += n;
- }
- }
- else
- nl = memchr (*cp, '\n', *re - *cp);
-
- res = *cp;
- }
-
- if (nl == NULL)
- nl = *re - 1;
- }
-
- *cp = nl + 1;
- assert (*cp <= *re);
-
- return res == *re ? NULL : res;
-}
-
-
-int
-__get_nprocs (void)
-{
- static int cached_result = -1;
- static time_t timestamp;
-
- time_t now = time (NULL);
- time_t prev = timestamp;
- atomic_read_barrier ();
- if (now == prev && cached_result > -1)
- return cached_result;
-
- /* XXX Here will come a test for the new system call. */
-
- const size_t buffer_size = __libc_use_alloca (8192) ? 8192 : 512;
- char *buffer = alloca (buffer_size);
- char *buffer_end = buffer + buffer_size;
- char *cp = buffer_end;
- char *re = buffer_end;
-
- const int flags = O_RDONLY | O_CLOEXEC;
- int fd = open_not_cancel_2 ("/sys/devices/system/cpu/online", flags);
- char *l;
- int result = 0;
- if (fd != -1)
- {
- l = next_line (fd, buffer, &cp, &re, buffer_end);
- if (l != NULL)
- do
- {
- char *endp;
- unsigned long int n = strtoul (l, &endp, 10);
- if (l == endp)
- {
- result = 0;
- break;
- }
-
- unsigned long int m = n;
- if (*endp == '-')
- {
- l = endp + 1;
- m = strtoul (l, &endp, 10);
- if (l == endp)
- {
- result = 0;
- break;
- }
- }
-
- result += m - n + 1;
-
- l = endp;
- while (l < re && isspace (*l))
- ++l;
- }
- while (l < re);
-
- close_not_cancel_no_status (fd);
-
- if (result > 0)
- goto out;
- }
-
- cp = buffer_end;
- re = buffer_end;
- result = 1;
-
- /* The /proc/stat format is more uniform, use it by default. */
- fd = open_not_cancel_2 ("/proc/stat", flags);
- if (fd != -1)
- {
- result = 0;
-
- while ((l = next_line (fd, buffer, &cp, &re, buffer_end)) != NULL)
- /* The current format of /proc/stat has all the cpu* entries
- at the front. We assume here that stays this way. */
- if (strncmp (l, "cpu", 3) != 0)
- break;
- else if (isdigit (l[3]))
- ++result;
-
- close_not_cancel_no_status (fd);
- }
- else
- {
- fd = open_not_cancel_2 ("/proc/cpuinfo", flags);
- if (fd != -1)
- {
- GET_NPROCS_PARSER (fd, buffer, cp, re, buffer_end, result);
- close_not_cancel_no_status (fd);
- }
- }
-
- out:
- cached_result = result;
- atomic_write_barrier ();
- timestamp = now;
-
- return result;
-}
-weak_alias (__get_nprocs, get_nprocs)
-
-
-/* On some architectures it is possible to distinguish between configured
- and active cpus. */
-int
-__get_nprocs_conf (void)
-{
- /* XXX Here will come a test for the new system call. */
-
- /* Try to use the sysfs filesystem. It has actual information about
- online processors. */
- DIR *dir = __opendir ("/sys/devices/system/cpu");
- if (dir != NULL)
- {
- int count = 0;
- struct dirent64 *d;
-
- while ((d = __readdir64 (dir)) != NULL)
- /* NB: the sysfs has d_type support. */
- if (d->d_type == DT_DIR && strncmp (d->d_name, "cpu", 3) == 0)
- {
- char *endp;
- unsigned long int nr = strtoul (d->d_name + 3, &endp, 10);
- if (nr != ULONG_MAX && endp != d->d_name + 3 && *endp == '\0')
- ++count;
- }
-
- __closedir (dir);
-
- return count;
- }
-
- int result = 1;
-
-#ifdef GET_NPROCS_CONF_PARSER
- /* If we haven't found an appropriate entry return 1. */
- FILE *fp = fopen ("/proc/cpuinfo", "rce");
- if (fp != NULL)
- {
- char buffer[8192];
-
- /* No threads use this stream. */
- __fsetlocking (fp, FSETLOCKING_BYCALLER);
- GET_NPROCS_CONF_PARSER (fp, buffer, result);
- fclose (fp);
- }
-#else
- result = __get_nprocs ();
-#endif
-
- return result;
-}
-weak_alias (__get_nprocs_conf, get_nprocs_conf)
-
-
-/* Compute (num*mem_unit)/pagesize, but avoid overflowing long int.
- In practice, mem_unit is never bigger than the page size, so after
- the first loop it is 1. [In the kernel, it is initialized to
- PAGE_SIZE in mm/page_alloc.c:si_meminfo(), and then in
- kernel.sys.c:do_sysinfo() it is set to 1 if unsigned long can
- represent all the sizes measured in bytes]. */
-static long int
-sysinfo_mempages (unsigned long int num, unsigned int mem_unit)
-{
- unsigned long int ps = __getpagesize ();
-
- while (mem_unit > 1 && ps > 1)
- {
- mem_unit >>= 1;
- ps >>= 1;
- }
- num *= mem_unit;
- while (ps > 1)
- {
- ps >>= 1;
- num >>= 1;
- }
- return num;
-}
-
-/* Return the number of pages of total/available physical memory in
- the system. This used to be done by parsing /proc/meminfo, but
- that's unnecessarily expensive (and /proc is not always available).
- The sysinfo syscall provides the same information, and has been
- available at least since kernel 2.3.48. */
-long int
-__get_phys_pages (void)
-{
- struct sysinfo info;
-
- __sysinfo (&info);
- return sysinfo_mempages (info.totalram, info.mem_unit);
-}
-weak_alias (__get_phys_pages, get_phys_pages)
-
-long int
-__get_avphys_pages (void)
-{
- struct sysinfo info;
-
- __sysinfo (&info);
- return sysinfo_mempages (info.freeram, info.mem_unit);
-}
-weak_alias (__get_avphys_pages, get_avphys_pages)
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