Return true if the receiver is a generic SystemCallError, or if the error numbers self and other are the same.
static VALUE
syserr_eqq(self, exc)
VALUE self, exc;
{
VALUE num, e;
ID en = rb_intern("errno");
if (!rb_obj_is_kind_of(exc, rb_eSystemCallError)) {
if (!rb_respond_to(exc, en)) return Qfalse;
}
else if (self == rb_eSystemCallError) return Qtrue;
num = rb_attr_get(exc, en);
if (NIL_P(num)) {
num = rb_funcall(exc, en, 0, 0);
}
e = rb_const_get(self, rb_intern("Errno"));
if (FIXNUM_P(num) ? num == e : rb_equal(num, e))
return Qtrue;
return Qfalse;
}
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(argc, argv, self)
int argc;
VALUE *argv;
VALUE self;
{
#if !defined(_WIN32) && !defined(__VMS)
char *strerror();
#endif
const char *err;
VALUE mesg, error;
VALUE klass = rb_obj_class(self);
if (klass == rb_eSystemCallError) {
rb_scan_args(argc, argv, "11", &mesg, &error);
if (argc == 1 && FIXNUM_P(mesg)) {
error = mesg; mesg = Qnil;
}
if (!NIL_P(error) && st_lookup(syserr_tbl, NUM2LONG(error), &klass)) {
/* change class */
if (TYPE(self) != T_OBJECT) { /* insurance to avoid type crash */
rb_raise(rb_eTypeError, "invalid instance type");
}
RBASIC(self)->klass = klass;
}
}
else {
rb_scan_args(argc, argv, "01", &mesg);
error = rb_const_get(klass, rb_intern("Errno"));
}
if (!NIL_P(error)) err = strerror(NUM2LONG(error));
else err = "unknown error";
if (!NIL_P(mesg)) {
VALUE str = mesg;
size_t len;
StringValue(str);
len = strlen(err)+RSTRING(str)->len+3;
mesg = rb_str_new(0, len);
snprintf(RSTRING(mesg)->ptr, len+1, "%s - %.*s", err,
(int)RSTRING(str)->len, RSTRING(str)->ptr);
rb_str_resize(mesg, strlen(RSTRING(mesg)->ptr));
}
else {
mesg = rb_str_new2(err);
}
rb_call_super(1, &mesg);
rb_iv_set(self, "errno", error);
return self;
}
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