/
etc.c
1206 lines (1108 loc) · 28.6 KB
/
etc.c
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/************************************************
etc.c -
$Author$
created at: Tue Mar 22 18:39:19 JST 1994
************************************************/
#include "ruby.h"
#include "ruby/encoding.h"
#include "ruby/io.h"
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_GETPWENT
#include <pwd.h>
#endif
#ifdef HAVE_GETGRENT
#include <grp.h>
#endif
#include <errno.h>
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif
#ifdef HAVE_SCHED_GETAFFINITY
#include <sched.h>
#endif
static VALUE sPasswd;
#ifdef HAVE_GETGRENT
static VALUE sGroup;
#endif
#ifdef _WIN32
#include <shlobj.h>
#ifndef CSIDL_COMMON_APPDATA
#define CSIDL_COMMON_APPDATA 35
#endif
#define HAVE_UNAME 1
#endif
#ifndef _WIN32
char *getenv();
#endif
char *getlogin();
#define RUBY_ETC_VERSION "1.1.0"
#include "constdefs.h"
/* call-seq:
* getlogin -> String
*
* Returns the short user name of the currently logged in user.
* Unfortunately, it is often rather easy to fool ::getlogin.
*
* Avoid ::getlogin for security-related purposes.
*
* If ::getlogin fails, try ::getpwuid.
*
* See the unix manpage for <code>getpwuid(3)</code> for more detail.
*
* e.g.
* Etc.getlogin -> 'guest'
*/
static VALUE
etc_getlogin(VALUE obj)
{
char *login;
#ifdef HAVE_GETLOGIN
login = getlogin();
if (!login) login = getenv("USER");
#else
login = getenv("USER");
#endif
if (login) {
#ifdef _WIN32
rb_encoding *extenc = rb_utf8_encoding();
#else
rb_encoding *extenc = rb_locale_encoding();
#endif
return rb_external_str_new_with_enc(login, strlen(login), extenc);
}
return Qnil;
}
#if defined(HAVE_GETPWENT) || defined(HAVE_GETGRENT)
static VALUE
safe_setup_str(const char *str)
{
if (str == 0) str = "";
return rb_str_new2(str);
}
static VALUE
safe_setup_locale_str(const char *str)
{
if (str == 0) str = "";
return rb_locale_str_new_cstr(str);
}
static VALUE
safe_setup_filesystem_str(const char *str)
{
if (str == 0) str = "";
return rb_filesystem_str_new_cstr(str);
}
#endif
#ifdef HAVE_GETPWENT
static VALUE
setup_passwd(struct passwd *pwd)
{
if (pwd == 0) rb_sys_fail("/etc/passwd");
return rb_struct_new(sPasswd,
safe_setup_locale_str(pwd->pw_name),
#ifdef HAVE_STRUCT_PASSWD_PW_PASSWD
safe_setup_str(pwd->pw_passwd),
#endif
UIDT2NUM(pwd->pw_uid),
GIDT2NUM(pwd->pw_gid),
#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
safe_setup_locale_str(pwd->pw_gecos),
#endif
safe_setup_filesystem_str(pwd->pw_dir),
safe_setup_filesystem_str(pwd->pw_shell),
#ifdef HAVE_STRUCT_PASSWD_PW_CHANGE
INT2NUM(pwd->pw_change),
#endif
#ifdef HAVE_STRUCT_PASSWD_PW_QUOTA
INT2NUM(pwd->pw_quota),
#endif
#ifdef HAVE_STRUCT_PASSWD_PW_AGE
PW_AGE2VAL(pwd->pw_age),
#endif
#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
safe_setup_locale_str(pwd->pw_class),
#endif
#ifdef HAVE_STRUCT_PASSWD_PW_COMMENT
safe_setup_locale_str(pwd->pw_comment),
#endif
#ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE
INT2NUM(pwd->pw_expire),
#endif
0 /*dummy*/
);
}
#endif
/* call-seq:
* getpwuid(uid) -> Passwd
*
* Returns the /etc/passwd information for the user with the given integer +uid+.
*
* The information is returned as a Passwd struct.
*
* If +uid+ is omitted, the value from <code>Passwd[:uid]</code> is returned
* instead.
*
* See the unix manpage for <code>getpwuid(3)</code> for more detail.
*
* === Example:
*
* Etc.getpwuid(0)
* #=> #<struct Etc::Passwd name="root", passwd="x", uid=0, gid=0, gecos="root",dir="/root", shell="/bin/bash">
*/
static VALUE
etc_getpwuid(int argc, VALUE *argv, VALUE obj)
{
#if defined(HAVE_GETPWENT)
VALUE id;
rb_uid_t uid;
struct passwd *pwd;
if (rb_scan_args(argc, argv, "01", &id) == 1) {
uid = NUM2UIDT(id);
}
else {
uid = getuid();
}
pwd = getpwuid(uid);
if (pwd == 0) rb_raise(rb_eArgError, "can't find user for %d", (int)uid);
return setup_passwd(pwd);
#else
return Qnil;
#endif
}
/* call-seq:
* getpwnam(name) -> Passwd
*
* Returns the /etc/passwd information for the user with specified login
* +name+.
*
* The information is returned as a Passwd struct.
*
* See the unix manpage for <code>getpwnam(3)</code> for more detail.
*
* === Example:
*
* Etc.getpwnam('root')
* #=> #<struct Etc::Passwd name="root", passwd="x", uid=0, gid=0, gecos="root",dir="/root", shell="/bin/bash">
*/
static VALUE
etc_getpwnam(VALUE obj, VALUE nam)
{
#ifdef HAVE_GETPWENT
struct passwd *pwd;
const char *p = StringValueCStr(nam);
pwd = getpwnam(p);
if (pwd == 0) rb_raise(rb_eArgError, "can't find user for %"PRIsVALUE, nam);
return setup_passwd(pwd);
#else
return Qnil;
#endif
}
#ifdef HAVE_GETPWENT
static int passwd_blocking = 0;
static VALUE
passwd_ensure(VALUE _)
{
endpwent();
passwd_blocking = (int)Qfalse;
return Qnil;
}
static VALUE
passwd_iterate(VALUE _)
{
struct passwd *pw;
setpwent();
while ((pw = getpwent()) != 0) {
rb_yield(setup_passwd(pw));
}
return Qnil;
}
static void
each_passwd(void)
{
if (passwd_blocking) {
rb_raise(rb_eRuntimeError, "parallel passwd iteration");
}
passwd_blocking = (int)Qtrue;
rb_ensure(passwd_iterate, 0, passwd_ensure, 0);
}
#endif
/* call-seq:
* Etc.passwd { |struct| block } -> Passwd
* Etc.passwd -> Passwd
*
* Provides a convenient Ruby iterator which executes a block for each entry
* in the /etc/passwd file.
*
* The code block is passed an Passwd struct.
*
* See ::getpwent above for details.
*
* Example:
*
* require 'etc'
*
* Etc.passwd {|u|
* puts u.name + " = " + u.gecos
* }
*
*/
static VALUE
etc_passwd(VALUE obj)
{
#ifdef HAVE_GETPWENT
struct passwd *pw;
if (rb_block_given_p()) {
each_passwd();
}
else if ((pw = getpwent()) != 0) {
return setup_passwd(pw);
}
#endif
return Qnil;
}
/* call-seq:
* Etc::Passwd.each { |struct| block } -> Passwd
* Etc::Passwd.each -> Enumerator
*
* Iterates for each entry in the /etc/passwd file if a block is given.
*
* If no block is given, returns the Enumerator.
*
* The code block is passed an Passwd struct.
*
* See ::getpwent above for details.
*
* Example:
*
* require 'etc'
*
* Etc::Passwd.each {|u|
* puts u.name + " = " + u.gecos
* }
*
* Etc::Passwd.collect {|u| u.gecos}
* Etc::Passwd.collect {|u| u.gecos}
*
*/
static VALUE
etc_each_passwd(VALUE obj)
{
#ifdef HAVE_GETPWENT
RETURN_ENUMERATOR(obj, 0, 0);
each_passwd();
#endif
return obj;
}
/* Resets the process of reading the /etc/passwd file, so that the next call
* to ::getpwent will return the first entry again.
*/
static VALUE
etc_setpwent(VALUE obj)
{
#ifdef HAVE_GETPWENT
setpwent();
#endif
return Qnil;
}
/* Ends the process of scanning through the /etc/passwd file begun with
* ::getpwent, and closes the file.
*/
static VALUE
etc_endpwent(VALUE obj)
{
#ifdef HAVE_GETPWENT
endpwent();
#endif
return Qnil;
}
/* Returns an entry from the /etc/passwd file.
*
* The first time it is called it opens the file and returns the first entry;
* each successive call returns the next entry, or +nil+ if the end of the file
* has been reached.
*
* To close the file when processing is complete, call ::endpwent.
*
* Each entry is returned as a Passwd struct.
*
*/
static VALUE
etc_getpwent(VALUE obj)
{
#ifdef HAVE_GETPWENT
struct passwd *pw;
if ((pw = getpwent()) != 0) {
return setup_passwd(pw);
}
#endif
return Qnil;
}
#ifdef HAVE_GETGRENT
static VALUE
setup_group(struct group *grp)
{
VALUE mem;
char **tbl;
mem = rb_ary_new();
tbl = grp->gr_mem;
while (*tbl) {
rb_ary_push(mem, safe_setup_locale_str(*tbl));
tbl++;
}
return rb_struct_new(sGroup,
safe_setup_locale_str(grp->gr_name),
#ifdef HAVE_STRUCT_GROUP_GR_PASSWD
safe_setup_str(grp->gr_passwd),
#endif
GIDT2NUM(grp->gr_gid),
mem);
}
#endif
/* call-seq:
* getgrgid(group_id) -> Group
*
* Returns information about the group with specified integer +group_id+,
* as found in /etc/group.
*
* The information is returned as a Group struct.
*
* See the unix manpage for <code>getgrgid(3)</code> for more detail.
*
* === Example:
*
* Etc.getgrgid(100)
* #=> #<struct Etc::Group name="users", passwd="x", gid=100, mem=["meta", "root"]>
*
*/
static VALUE
etc_getgrgid(int argc, VALUE *argv, VALUE obj)
{
#ifdef HAVE_GETGRENT
VALUE id;
gid_t gid;
struct group *grp;
if (rb_scan_args(argc, argv, "01", &id) == 1) {
gid = NUM2GIDT(id);
}
else {
gid = getgid();
}
grp = getgrgid(gid);
if (grp == 0) rb_raise(rb_eArgError, "can't find group for %d", (int)gid);
return setup_group(grp);
#else
return Qnil;
#endif
}
/* call-seq:
* getgrnam(name) -> Group
*
* Returns information about the group with specified +name+, as found in
* /etc/group.
*
* The information is returned as a Group struct.
*
* See the unix manpage for <code>getgrnam(3)</code> for more detail.
*
* === Example:
*
* Etc.getgrnam('users')
* #=> #<struct Etc::Group name="users", passwd="x", gid=100, mem=["meta", "root"]>
*
*/
static VALUE
etc_getgrnam(VALUE obj, VALUE nam)
{
#ifdef HAVE_GETGRENT
struct group *grp;
const char *p = StringValueCStr(nam);
grp = getgrnam(p);
if (grp == 0) rb_raise(rb_eArgError, "can't find group for %"PRIsVALUE, nam);
return setup_group(grp);
#else
return Qnil;
#endif
}
#ifdef HAVE_GETGRENT
static int group_blocking = 0;
static VALUE
group_ensure(VALUE _)
{
endgrent();
group_blocking = (int)Qfalse;
return Qnil;
}
static VALUE
group_iterate(VALUE _)
{
struct group *pw;
setgrent();
while ((pw = getgrent()) != 0) {
rb_yield(setup_group(pw));
}
return Qnil;
}
static void
each_group(void)
{
if (group_blocking) {
rb_raise(rb_eRuntimeError, "parallel group iteration");
}
group_blocking = (int)Qtrue;
rb_ensure(group_iterate, 0, group_ensure, 0);
}
#endif
/* Provides a convenient Ruby iterator which executes a block for each entry
* in the /etc/group file.
*
* The code block is passed an Group struct.
*
* See ::getgrent above for details.
*
* Example:
*
* require 'etc'
*
* Etc.group {|g|
* puts g.name + ": " + g.mem.join(', ')
* }
*
*/
static VALUE
etc_group(VALUE obj)
{
#ifdef HAVE_GETGRENT
struct group *grp;
if (rb_block_given_p()) {
each_group();
}
else if ((grp = getgrent()) != 0) {
return setup_group(grp);
}
#endif
return Qnil;
}
#ifdef HAVE_GETGRENT
/* call-seq:
* Etc::Group.each { |group| block } -> obj
* Etc::Group.each -> Enumerator
*
* Iterates for each entry in the /etc/group file if a block is given.
*
* If no block is given, returns the Enumerator.
*
* The code block is passed a Group struct.
*
* Example:
*
* require 'etc'
*
* Etc::Group.each {|g|
* puts g.name + ": " + g.mem.join(', ')
* }
*
* Etc::Group.collect {|g| g.name}
* Etc::Group.select {|g| !g.mem.empty?}
*
*/
static VALUE
etc_each_group(VALUE obj)
{
RETURN_ENUMERATOR(obj, 0, 0);
each_group();
return obj;
}
#endif
/* Resets the process of reading the /etc/group file, so that the next call
* to ::getgrent will return the first entry again.
*/
static VALUE
etc_setgrent(VALUE obj)
{
#ifdef HAVE_GETGRENT
setgrent();
#endif
return Qnil;
}
/* Ends the process of scanning through the /etc/group file begun by
* ::getgrent, and closes the file.
*/
static VALUE
etc_endgrent(VALUE obj)
{
#ifdef HAVE_GETGRENT
endgrent();
#endif
return Qnil;
}
/* Returns an entry from the /etc/group file.
*
* The first time it is called it opens the file and returns the first entry;
* each successive call returns the next entry, or +nil+ if the end of the file
* has been reached.
*
* To close the file when processing is complete, call ::endgrent.
*
* Each entry is returned as a Group struct
*/
static VALUE
etc_getgrent(VALUE obj)
{
#ifdef HAVE_GETGRENT
struct group *gr;
if ((gr = getgrent()) != 0) {
return setup_group(gr);
}
#endif
return Qnil;
}
#define numberof(array) (sizeof(array) / sizeof(*(array)))
#ifdef _WIN32
VALUE rb_w32_special_folder(int type);
UINT rb_w32_system_tmpdir(WCHAR *path, UINT len);
VALUE rb_w32_conv_from_wchar(const WCHAR *wstr, rb_encoding *enc);
#endif
/*
* Returns system configuration directory.
*
* This is typically "/etc", but is modified by the prefix used when Ruby was
* compiled. For example, if Ruby is built and installed in /usr/local,
* returns "/usr/local/etc" on other platforms than Windows.
* On Windows, this always returns the directory provided by the system.
*/
static VALUE
etc_sysconfdir(VALUE obj)
{
#ifdef _WIN32
return rb_w32_special_folder(CSIDL_COMMON_APPDATA);
#else
return rb_filesystem_str_new_cstr(SYSCONFDIR);
#endif
}
/*
* Returns system temporary directory; typically "/tmp".
*/
static VALUE
etc_systmpdir(VALUE _)
{
VALUE tmpdir;
#ifdef _WIN32
WCHAR path[_MAX_PATH];
UINT len = rb_w32_system_tmpdir(path, numberof(path));
if (!len) return Qnil;
tmpdir = rb_w32_conv_from_wchar(path, rb_filesystem_encoding());
#else
const char default_tmp[] = "/tmp";
const char *tmpstr = default_tmp;
size_t tmplen = strlen(default_tmp);
# if defined _CS_DARWIN_USER_TEMP_DIR
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
char path[MAXPATHLEN];
size_t len;
len = confstr(_CS_DARWIN_USER_TEMP_DIR, path, sizeof(path));
if (len > 0) {
tmpstr = path;
tmplen = len - 1;
if (len > sizeof(path)) tmpstr = 0;
}
# endif
tmpdir = rb_filesystem_str_new(tmpstr, tmplen);
# if defined _CS_DARWIN_USER_TEMP_DIR
if (!tmpstr) {
confstr(_CS_DARWIN_USER_TEMP_DIR, RSTRING_PTR(tmpdir), len);
}
# endif
#endif
#ifndef RB_PASS_KEYWORDS
/* untaint on Ruby < 2.7 */
FL_UNSET(tmpdir, FL_TAINT);
#endif
return tmpdir;
}
#ifdef HAVE_UNAME
/*
* Returns the system information obtained by uname system call.
*
* The return value is a hash which has 5 keys at least:
* :sysname, :nodename, :release, :version, :machine
*
* Example:
*
* require 'etc'
* require 'pp'
*
* pp Etc.uname
* #=> {:sysname=>"Linux",
* # :nodename=>"boron",
* # :release=>"2.6.18-6-xen-686",
* # :version=>"#1 SMP Thu Nov 5 19:54:42 UTC 2009",
* # :machine=>"i686"}
*
*/
static VALUE
etc_uname(VALUE obj)
{
#ifdef _WIN32
OSVERSIONINFOW v;
SYSTEM_INFO s;
const char *sysname, *mach;
VALUE result, release, version;
VALUE vbuf, nodename = Qnil;
DWORD len = 0;
WCHAR *buf;
v.dwOSVersionInfoSize = sizeof(v);
if (!GetVersionExW(&v))
rb_sys_fail("GetVersionEx");
result = rb_hash_new();
switch (v.dwPlatformId) {
case VER_PLATFORM_WIN32s:
sysname = "Win32s";
break;
case VER_PLATFORM_WIN32_NT:
sysname = "Windows_NT";
break;
case VER_PLATFORM_WIN32_WINDOWS:
default:
sysname = "Windows";
break;
}
rb_hash_aset(result, ID2SYM(rb_intern("sysname")), rb_str_new_cstr(sysname));
release = rb_sprintf("%lu.%lu.%lu", v.dwMajorVersion, v.dwMinorVersion, v.dwBuildNumber);
rb_hash_aset(result, ID2SYM(rb_intern("release")), release);
version = rb_sprintf("%s Version %"PRIsVALUE": %"PRIsVALUE, sysname, release,
rb_w32_conv_from_wchar(v.szCSDVersion, rb_utf8_encoding()));
rb_hash_aset(result, ID2SYM(rb_intern("version")), version);
# if defined _MSC_VER && _MSC_VER < 1300
# define GET_COMPUTER_NAME(ptr, plen) GetComputerNameW(ptr, plen)
# else
# define GET_COMPUTER_NAME(ptr, plen) GetComputerNameExW(ComputerNameDnsFullyQualified, ptr, plen)
# endif
GET_COMPUTER_NAME(NULL, &len);
buf = ALLOCV_N(WCHAR, vbuf, len);
if (GET_COMPUTER_NAME(buf, &len)) {
nodename = rb_w32_conv_from_wchar(buf, rb_utf8_encoding());
}
ALLOCV_END(vbuf);
if (NIL_P(nodename)) nodename = rb_str_new(0, 0);
rb_hash_aset(result, ID2SYM(rb_intern("nodename")), nodename);
# ifndef PROCESSOR_ARCHITECTURE_AMD64
# define PROCESSOR_ARCHITECTURE_AMD64 9
# endif
# ifndef PROCESSOR_ARCHITECTURE_INTEL
# define PROCESSOR_ARCHITECTURE_INTEL 0
# endif
GetSystemInfo(&s);
switch (s.wProcessorArchitecture) {
case PROCESSOR_ARCHITECTURE_AMD64:
mach = "x64";
break;
case PROCESSOR_ARCHITECTURE_ARM:
mach = "ARM";
break;
case PROCESSOR_ARCHITECTURE_INTEL:
mach = "x86";
break;
default:
mach = "unknown";
break;
}
rb_hash_aset(result, ID2SYM(rb_intern("machine")), rb_str_new_cstr(mach));
#else
struct utsname u;
int ret;
VALUE result;
ret = uname(&u);
if (ret == -1)
rb_sys_fail("uname");
result = rb_hash_new();
rb_hash_aset(result, ID2SYM(rb_intern("sysname")), rb_str_new_cstr(u.sysname));
rb_hash_aset(result, ID2SYM(rb_intern("nodename")), rb_str_new_cstr(u.nodename));
rb_hash_aset(result, ID2SYM(rb_intern("release")), rb_str_new_cstr(u.release));
rb_hash_aset(result, ID2SYM(rb_intern("version")), rb_str_new_cstr(u.version));
rb_hash_aset(result, ID2SYM(rb_intern("machine")), rb_str_new_cstr(u.machine));
#endif
return result;
}
#else
#define etc_uname rb_f_notimplement
#endif
#ifdef HAVE_SYSCONF
/*
* Returns system configuration variable using sysconf().
*
* _name_ should be a constant under <code>Etc</code> which begins with <code>SC_</code>.
*
* The return value is an integer or nil.
* nil means indefinite limit. (sysconf() returns -1 but errno is not set.)
*
* Etc.sysconf(Etc::SC_ARG_MAX) #=> 2097152
* Etc.sysconf(Etc::SC_LOGIN_NAME_MAX) #=> 256
*
*/
static VALUE
etc_sysconf(VALUE obj, VALUE arg)
{
int name;
long ret;
name = NUM2INT(arg);
errno = 0;
ret = sysconf(name);
if (ret == -1) {
if (errno == 0) /* no limit */
return Qnil;
rb_sys_fail("sysconf");
}
return LONG2NUM(ret);
}
#else
#define etc_sysconf rb_f_notimplement
#endif
#ifdef HAVE_CONFSTR
/*
* Returns system configuration variable using confstr().
*
* _name_ should be a constant under <code>Etc</code> which begins with <code>CS_</code>.
*
* The return value is a string or nil.
* nil means no configuration-defined value. (confstr() returns 0 but errno is not set.)
*
* Etc.confstr(Etc::CS_PATH) #=> "/bin:/usr/bin"
*
* # GNU/Linux
* Etc.confstr(Etc::CS_GNU_LIBC_VERSION) #=> "glibc 2.18"
* Etc.confstr(Etc::CS_GNU_LIBPTHREAD_VERSION) #=> "NPTL 2.18"
*
*/
static VALUE
etc_confstr(VALUE obj, VALUE arg)
{
int name;
char localbuf[128], *buf = localbuf;
size_t bufsize = sizeof(localbuf), ret;
VALUE tmp;
name = NUM2INT(arg);
errno = 0;
ret = confstr(name, buf, bufsize);
if (bufsize < ret) {
bufsize = ret;
buf = ALLOCV_N(char, tmp, bufsize);
errno = 0;
ret = confstr(name, buf, bufsize);
}
if (bufsize < ret)
rb_bug("required buffer size for confstr() changed dynamically.");
if (ret == 0) {
if (errno == 0) /* no configuration-defined value */
return Qnil;
rb_sys_fail("confstr");
}
return rb_str_new_cstr(buf);
}
#else
#define etc_confstr rb_f_notimplement
#endif
#ifdef HAVE_FPATHCONF
/*
* Returns pathname configuration variable using fpathconf().
*
* _name_ should be a constant under <code>Etc</code> which begins with <code>PC_</code>.
*
* The return value is an integer or nil.
* nil means indefinite limit. (fpathconf() returns -1 but errno is not set.)
*
* require 'etc'
* IO.pipe {|r, w|
* p w.pathconf(Etc::PC_PIPE_BUF) #=> 4096
* }
*
*/
static VALUE
io_pathconf(VALUE io, VALUE arg)
{
int name;
long ret;
rb_io_t *fptr;
name = NUM2INT(arg);
GetOpenFile(io, fptr);
errno = 0;
ret = fpathconf(fptr->fd, name);
if (ret == -1) {
if (errno == 0) /* no limit */
return Qnil;
rb_sys_fail("fpathconf");
}
return LONG2NUM(ret);
}
#else
#define io_pathconf rb_f_notimplement
#endif
#if (defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)) || defined(_WIN32)
#if defined(HAVE_SCHED_GETAFFINITY) && defined(CPU_ALLOC)
static int
etc_nprocessors_affin(void)
{
cpu_set_t *cpuset;
size_t size;
int ret;
int n;
/*
* XXX:
* man page says CPU_ALLOC takes number of cpus. But it is not accurate
* explanation. sched_getaffinity() returns EINVAL if cpuset bitmap is
* smaller than kernel internal bitmap.
* That said, sched_getaffinity() can fail when a kernel have sparse bitmap
* even if cpuset bitmap is larger than number of cpus.
* The precious way is to use /sys/devices/system/cpu/online. But there are
* two problems,
* - Costly calculation
* It is a minor issue, but possibly kill a benefit of a parallel processing.
* - No guarantee to exist /sys/devices/system/cpu/online
* This is an issue especially when using Linux containers.
* So, we use hardcode number for a workaround. Current linux kernel
* (Linux 3.17) support 8192 cpus at maximum. Then 16384 must be enough.
*/
for (n=64; n <= 16384; n *= 2) {
size = CPU_ALLOC_SIZE(n);
if (size >= 1024) {
cpuset = xcalloc(1, size);
if (!cpuset)
return -1;
} else {
cpuset = alloca(size);
CPU_ZERO_S(size, cpuset);
}
ret = sched_getaffinity(0, size, cpuset);
if (ret == 0) {
/* On success, count number of cpus. */
ret = CPU_COUNT_S(size, cpuset);
}
if (size >= 1024) {
xfree(cpuset);
}
if (ret > 0) {
return ret;
}
}
return ret;
}
#endif
/*
* Returns the number of online processors.
*
* The result is intended as the number of processes to
* use all available processors.
*
* This method is implemented using:
* - sched_getaffinity(): Linux
* - sysconf(_SC_NPROCESSORS_ONLN): GNU/Linux, NetBSD, FreeBSD, OpenBSD, DragonFly BSD, OpenIndiana, Mac OS X, AIX
*
* Example:
*
* require 'etc'
* p Etc.nprocessors #=> 4
*
* The result might be smaller number than physical cpus especially when ruby
* process is bound to specific cpus. This is intended for getting better
* parallel processing.
*
* Example: (Linux)
*
* linux$ taskset 0x3 ./ruby -retc -e "p Etc.nprocessors" #=> 2