End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
class method
IO.binread
IO.binread(command, length = nil, offset = 0) → string or nil
IO.binread(path, length = nil, offset = 0) → string or nil
io.c
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static VALUE
rb_io_s_binread(int argc, VALUE *argv, VALUE io)
{
VALUE offset;
struct foreach_arg arg;
enum {
fmode = FMODE_READABLE|FMODE_BINMODE,
oflags = O_RDONLY
#ifdef O_BINARY
|O_BINARY
#endif
};
convconfig_t convconfig = {NULL, NULL, 0, Qnil};
rb_scan_args(argc, argv, "12", NULL, NULL, &offset);
FilePathValue(argv[0]);
convconfig.enc = rb_ascii8bit_encoding();
arg.io = rb_io_open_generic(io, argv[0], oflags, fmode, &convconfig, 0);
if (NIL_P(arg.io)) return Qnil;
arg.argv = argv+1;
arg.argc = (argc > 1) ? 1 : 0;
if (!NIL_P(offset)) {
struct seek_arg sarg;
int state = 0;
sarg.io = arg.io;
sarg.offset = offset;
sarg.mode = SEEK_SET;
rb_protect(seek_before_access, (VALUE)&sarg, &state);
if (state) {
rb_io_close(arg.io);
rb_jump_tag(state);
}
}
return rb_ensure(io_s_read, (VALUE)&arg, rb_io_close, arg.io);
}
Behaves like IO.read, except that the stream is opened in binary mode with ASCII-8BIT encoding.
When called from class IO (but not subclasses of IO), this method has potential security vulnerabilities if called with untrusted input; see Command Injection.