Exception: SystemCallError

StandardError show all
Defined in:


SystemCallError is the base class for all low-level platform-dependent errors.

The errors available on the current platform are subclasses of SystemCallError and are defined in the Errno module.


raises the exception:

Errno::ENOENT: No such file or directory - does/not/exist

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Exception

#==, #backtrace, #exception, exception, #inspect, #message, #set_backtrace, #to_s

Constructor Details

#new(msg, errno) ⇒ Object

If errno corresponds to a known system error code, constructs the appropriate Errno class for that error, otherwise constructs a generic SystemCallError object. The error number is subsequently available via the errno method.

# File 'error.c'

static VALUE
syserr_initialize(int argc, VALUE *argv, VALUE self)
#if !defined(_WIN32)
char *strerror();
const char *err;
VALUE mesg, error;
VALUE klass = rb_obj_class(self);

if (klass == rb_eSystemCallError) {
st_data_t data = (st_data_t)klass;
rb_scan_args(argc, argv, "11", &mesg, &error);
if (argc == 1 && FIXNUM_P(mesg)) {
    error = mesg; mesg = Qnil;

Class Method Details

.===(other) ⇒ Boolean

Return true if the receiver is a generic SystemCallError, or if the error numbers self and other are the same.


  • (Boolean)

# File 'error.c'

static VALUE
syserr_eqq(VALUE self, VALUE exc)
VALUE num, e;
ID en;

CONST_ID(en, "errno");

if (!rb_obj_is_kind_of(exc, rb_eSystemCallError)) {
if (!rb_respond_to(exc, en)) return Qfalse;

Instance Method Details


Return this SystemCallError's error number.


# File 'error.c'

static VALUE
syserr_errno(VALUE self)
    return rb_attr_get(self, rb_intern("errno"));