GDB interrupts ptrace and other API calls not working with OS X Mavericks

An old and well-known technique to prevent debugging of an executable file in OS X is to use the following ptrace call to prevent debuggers from attaching themselves to the executable.

ptrace(PT_DENY_ATTACH, 0, 0, 0);

Attempting to run an executable with this code in GDB will result in GDB failing with a response [Inferior 1 (process #) exited with code 055]. Getting around this was as simple as using load executable in gdb and setting a breakpoint on ptrace using b ptraceand input yon request Make breakpoint pending on future shared library load? (y or [n]). Unfortunately, when the executable is launched, this breakpoint is never set and ends without continuing.

Here's how to reproduce the problem.

• Install Xcode 5 using command line tools.
• Install GDB via Homebrew ( brew install https://raw.github.com/Homebrew/homebrew-dupes/master/gdb.rb), sign the executable file code ( http://sourceware.org/gdb/wiki/BuildingOnDarwin ) and reboot (restarting the task did not seem to work).

• Compile the following C program ptrace.c, compile withgcc -o ptrace ptrace.c

  #include <stdio.h>
  #include <sys/types.h>
  #include <sys/ptrace.h>
  
  int main()
  {
  ptrace(PT_DENY_ATTACH, 0, 0, 0);
  printf("Hello, World!\n");
  }
  

• From the directory with the compiled executable, do the following:

  $ gdb ptrace
  ...
  (gdb) b ptrace
  Function "ptrace" not defined.
  Make breakpoint pending on future shared library load? (y or [n]) y
  
  Breakpoint 1 (ptrace) pending.
  (gdb) r
  Starting program: .../ptrace
  [Inferior 1 (process #) exited with code 055]
  

After further testing, the same is true for other functions that are not part of the executable, for example printf. I searched the internet and could not find anything to suggest the above, it may not work. I am open to almost any solution using gdb or lldb, and would also appreciate any documentation regarding what might be the problem.