SystemCallError

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.

File.open("does/not/exist")

raises the exception:

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

Public Class Methods

system_call_error === other → true or false click to toggle source

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

 
 static VALUE
syserr_eqq(VALUE self, VALUE exc)
{
 VALUE num, e;
 if (!rb_obj_is_kind_of(exc, rb_eSystemCallError)) {
 if (!rb_respond_to(exc, id_errno)) return Qfalse;
 }
 else if (self == rb_eSystemCallError) return Qtrue;
 num = rb_attr_get(exc, id_errno);
 if (NIL_P(num)) {
 num = rb_funcallv(exc, id_errno, 0, 0);
 }
 e = rb_const_get(self, id_Errno);
 if (FIXNUM_P(num) ? num == e : rb_equal(num, e))
 return Qtrue;
 return Qfalse;
}

new(msg, errno) → system_call_error_subclass click to toggle source

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.

 
 static VALUE
syserr_initialize(int argc, VALUE *argv, VALUE self)
{
#if !defined(_WIN32)
 char *strerror();
#endif
 const char *err;
 VALUE mesg, error, func, errmsg;
 VALUE klass = rb_obj_class(self);
 if (klass == rb_eSystemCallError) {
 st_data_t data = (st_data_t)klass;
 rb_scan_args(argc, argv, "12", &mesg, &error, &func);
 if (argc == 1 && FIXNUM_P(mesg)) {
 error = mesg; mesg = Qnil;
 }
 if (!NIL_P(error) && st_lookup(syserr_tbl, NUM2LONG(error), &data)) {
 klass = (VALUE)data;
 /* change class */
 if (!RB_TYPE_P(self, T_OBJECT)) { /* insurance to avoid type crash */
 rb_raise(rb_eTypeError, "invalid instance type");
 }
 RBASIC_SET_CLASS(self, klass);
 }
 }
 else {
 rb_scan_args(argc, argv, "02", &mesg, &func);
 error = rb_const_get(klass, id_Errno);
 }
 if (!NIL_P(error)) err = strerror(NUM2INT(error));
 else err = "unknown error";
 errmsg = rb_enc_str_new_cstr(err, rb_locale_encoding());
 if (!NIL_P(mesg)) {
 VALUE str = StringValue(mesg);
 if (!NIL_P(func)) rb_str_catf(errmsg, " @ %"PRIsVALUE, func);
 rb_str_catf(errmsg, " - %"PRIsVALUE, str);
 OBJ_INFECT(errmsg, mesg);
 }
 mesg = errmsg;
 rb_call_super(1, &mesg);
 rb_ivar_set(self, id_errno, error);
 return self;
}

Public Instance Methods

errno → integer click to toggle source

Return this SystemCallError's error number.

 
 static VALUE
syserr_errno(VALUE self)
{
 return rb_attr_get(self, id_errno);
}