Etc.sysconf

sysconf(p1)

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);
}

Returns system configuration variable using sysconf().

name should be a constant under Etc which begins with SC_.

The return value is an integer or nil. nil means indefinite limit. (sysconf() returns -1 but errno is not set.)

Example

Etc.sysconf(Etc::SC_ARG_MAX) #=> 2097152
Etc.sysconf(Etc::SC_LOGIN_NAME_MAX) #=> 256

See also .setpwent .sysconfdir .setgrent .systmpdir also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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