Class: Process::Status (Ruby 2.3.4)

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    • process.c

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    Process::Status

    Process::Status encapsulates the information on the status of a running or terminated system process. The built-in variable $? is either nil or a Process::Status object.

    fork { exit 99 }   #=> 26557
    Process.wait       #=> 26557
    $?.class           #=> Process::Status
    $?.to_i            #=> 25344
    $? >> 8            #=> 99
    $?.stopped?        #=> false
    $?.exited?         #=> true
    $?.exitstatus      #=> 99
    

    Posix systems record information on processes using a 16-bit integer. The lower bits record the process status (stopped, exited, signaled) and the upper bits possibly contain additional information (for example the program's return code in the case of exited processes). Pre Ruby 1.8, these bits were exposed directly to the Ruby program. Ruby now encapsulates these in a Process::Status object. To maximize compatibility, however, these objects retain a bit-oriented interface. In the descriptions that follow, when we talk about the integer value of stat, we're referring to this 16 bit value.

    Public Instance Methods

    stat & num → fixnum click to toggle source

    Logical AND of the bits in stat with num.

    fork { exit 0x37 }
    Process.wait
    sprintf('%04x', $?.to_i)       #=> "3700"
    sprintf('%04x', $? & 0x1e00)   #=> "1600"
    
     
                   static VALUE
    pst_bitand(VALUE st1, VALUE st2)
    {
        int status = PST2INT(st1) & NUM2INT(st2);
    
        return INT2NUM(status);
    }
                
    stat == other → true or false click to toggle source

    Returns true if the integer value of stat equals other.

     
                   static VALUE
    pst_equal(VALUE st1, VALUE st2)
    {
        if (st1 == st2) return Qtrue;
        return rb_equal(pst_to_i(st1), st2);
    }
                
    stat >> num → fixnum click to toggle source

    Shift the bits in stat right num places.

    fork { exit 99 }   #=> 26563
    Process.wait       #=> 26563
    $?.to_i            #=> 25344
    $? >> 8            #=> 99
    
     
                   static VALUE
    pst_rshift(VALUE st1, VALUE st2)
    {
        int status = PST2INT(st1) >> NUM2INT(st2);
    
        return INT2NUM(status);
    }
                
    coredump? → true or false click to toggle source

    Returns true if stat generated a coredump when it terminated. Not available on all platforms.

     
                   static VALUE
    pst_wcoredump(VALUE st)
    {
    #ifdef WCOREDUMP
        int status = PST2INT(st);
    
        if (WCOREDUMP(status))
            return Qtrue;
        else
            return Qfalse;
    #else
        return Qfalse;
    #endif
    }
                
    exited? → true or false click to toggle source

    Returns true if stat exited normally (for example using an exit() call or finishing the program).

     
                   static VALUE
    pst_wifexited(VALUE st)
    {
        int status = PST2INT(st);
    
        if (WIFEXITED(status))
            return Qtrue;
        else
            return Qfalse;
    }
                
    exitstatus → fixnum or nil click to toggle source

    Returns the least significant eight bits of the return code of stat. Only available if exited? is true.

    fork { }           #=> 26572
    Process.wait       #=> 26572
    $?.exited?         #=> true
    $?.exitstatus      #=> 0
    
    fork { exit 99 }   #=> 26573
    Process.wait       #=> 26573
    $?.exited?         #=> true
    $?.exitstatus      #=> 99
    
     
                   static VALUE
    pst_wexitstatus(VALUE st)
    {
        int status = PST2INT(st);
    
        if (WIFEXITED(status))
            return INT2NUM(WEXITSTATUS(status));
        return Qnil;
    }
                
    inspect → string click to toggle source

    Override the inspection method.

    system("false")
    p $?.inspect #=> "#<Process::Status: pid 12861 exit 1>"
    
     
                   static VALUE
    pst_inspect(VALUE st)
    {
        rb_pid_t pid;
        int status;
        VALUE vpid, str;
    
        vpid = pst_pid(st);
        if (NIL_P(vpid)) {
            return rb_sprintf("#<%s: uninitialized>", rb_class2name(CLASS_OF(st)));
        }
        pid = NUM2PIDT(vpid);
        status = PST2INT(st);
    
        str = rb_sprintf("#<%s: ", rb_class2name(CLASS_OF(st)));
        pst_message(str, pid, status);
        rb_str_cat2(str, ">");
        return str;
    }
                
    pid → fixnum click to toggle source

    Returns the process ID that this status object represents.

    fork { exit }   #=> 26569
    Process.wait    #=> 26569
    $?.pid          #=> 26569
    
     
                   static VALUE
    pst_pid(VALUE st)
    {
        return rb_attr_get(st, id_pid);
    }
                
    signaled? → true or false click to toggle source

    Returns true if stat terminated because of an uncaught signal.

     
                   static VALUE
    pst_wifsignaled(VALUE st)
    {
        int status = PST2INT(st);
    
        if (WIFSIGNALED(status))
            return Qtrue;
        else
            return Qfalse;
    }
                
    stopped? → true or false click to toggle source

    Returns true if this process is stopped. This is only returned if the corresponding wait call had the WUNTRACED flag set.

     
                   static VALUE
    pst_wifstopped(VALUE st)
    {
        int status = PST2INT(st);
    
        if (WIFSTOPPED(status))
            return Qtrue;
        else
            return Qfalse;
    }
                
    stopsig → fixnum or nil click to toggle source

    Returns the number of the signal that caused stat to stop (or nil if self is not stopped).

     
                   static VALUE
    pst_wstopsig(VALUE st)
    {
        int status = PST2INT(st);
    
        if (WIFSTOPPED(status))
            return INT2NUM(WSTOPSIG(status));
        return Qnil;
    }
                
    success? → true, false or nil click to toggle source

    Returns true if stat is successful, false if not. Returns nil if exited? is not true.

     
                   static VALUE
    pst_success_p(VALUE st)
    {
        int status = PST2INT(st);
    
        if (!WIFEXITED(status))
            return Qnil;
        return WEXITSTATUS(status) == EXIT_SUCCESS ? Qtrue : Qfalse;
    }
                
    termsig → fixnum or nil click to toggle source

    Returns the number of the signal that caused stat to terminate (or nil if self was not terminated by an uncaught signal).

     
                   static VALUE
    pst_wtermsig(VALUE st)
    {
        int status = PST2INT(st);
    
        if (WIFSIGNALED(status))
            return INT2NUM(WTERMSIG(status));
        return Qnil;
    }
                
    to_i → fixnum click to toggle source
    to_int → fixnum

    Returns the bits in stat as a Fixnum. Poking around in these bits is platform dependent.

    fork { exit 0xab }         #=> 26566
    Process.wait               #=> 26566
    sprintf('%04x', $?.to_i)   #=> "ab00"
    
     
                   static VALUE
    pst_to_i(VALUE st)
    {
        return rb_ivar_get(st, id_status);
    }
                
    to_s → string click to toggle source

    Show pid and exit status as a string.

    system("false")
    p $?.to_s         #=> "pid 12766 exit 1"
    
     
                   static VALUE
    pst_to_s(VALUE st)
    {
        rb_pid_t pid;
        int status;
        VALUE str;
    
        pid = NUM2PIDT(pst_pid(st));
        status = PST2INT(st);
    
        str = rb_str_buf_new(0);
        pst_message(str, pid, status);
        return str;
    }