method

confstr

Ruby latest stable (v2_5_5) - 0 notes - Class: Etc

1_8_6_287
1_8_7_72
1_8_7_330
1_9_1_378
1_9_2_180
1_9_3_125
1_9_3_392
2_1_10
2_2_9 (0)
2_4_6 (0)
2_5_5 (0)
2_6_3 (0)
What's this?

confstr(p1) public

Returns system configuration variable using confstr().

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

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"

Show source

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);
}

confstr

Related methods