stub out demon/fontprovider so we can build debugger

src/demon/linux/demon_core_linux.c

@@ -15,6 +15,8 @@ dmn_init(void)
 internal DMN_CtrlCtx *
 dmn_ctrl_begin(void)
 {
+  DMN_CtrlCtx *ctx = (DMN_CtrlCtx *)1;
+  return ctx;
 }
 
 internal void
@@ -30,26 +32,32 @@ dmn_ctrl_exclusive_access_end(void)
 internal U32
 dmn_ctrl_launch(DMN_CtrlCtx *ctx, OS_ProcessLaunchParams *params)
 {
+  return 0;
 }
 
 internal B32
 dmn_ctrl_attach(DMN_CtrlCtx *ctx, U32 pid)
 {
+  return 0;
 }
 
 internal B32
 dmn_ctrl_kill(DMN_CtrlCtx *ctx, DMN_Handle process, U32 exit_code)
 {
+  return 0;
 }
 
 internal B32
 dmn_ctrl_detach(DMN_CtrlCtx *ctx, DMN_Handle process)
 {
+  return 0;
 }
 
 internal DMN_EventList
 dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
 {
+  DMN_EventList evts = {0};
+  return evts;
 }
 
 ////////////////////////////////
@@ -68,16 +76,19 @@ dmn_halt(U64 code, U64 user_data)
 internal U64
 dmn_run_gen(void)
 {
+  return 0;
 }
 
 internal U64
 dmn_mem_gen(void)
 {
+  return 0;
 }
 
 internal U64
 dmn_reg_gen(void)
 {
+  return 0;
 }
 
 //- rjf: non-blocking-control-thread access barriers
@@ -85,6 +96,7 @@ dmn_reg_gen(void)
 internal B32
 dmn_access_open(void)
 {
+  return 0;
 }
 
 internal void
@@ -97,6 +109,7 @@ dmn_access_close(void)
 internal U64
 dmn_process_memory_reserve(DMN_Handle process, U64 vaddr, U64 size)
 {
+  return 0;
 }
 
 internal void
@@ -122,11 +135,13 @@ dmn_process_memory_protect(DMN_Handle process, U64 vaddr, U64 size, OS_AccessFla
 internal U64
 dmn_process_read(DMN_Handle process, Rng1U64 range, void *dst)
 {
+  return 0;
 }
 
 internal B32
 dmn_process_write(DMN_Handle process, Rng1U64 range, void *src)
 {
+  return 0;
 }
 
 //- rjf: threads
@@ -134,26 +149,31 @@ dmn_process_write(DMN_Handle process, Rng1U64 range, void *src)
 internal Arch
 dmn_arch_from_thread(DMN_Handle handle)
 {
+  return Arch_Null;
 }
 
 internal U64
 dmn_stack_base_vaddr_from_thread(DMN_Handle handle)
 {
+  return 0;
 }
 
 internal U64
 dmn_tls_root_vaddr_from_thread(DMN_Handle handle)
 {
+  return 0;
 }
 
 internal B32
 dmn_thread_read_reg_block(DMN_Handle handle, void *reg_block)
 {
+  return 0;
 }
 
 internal B32
 dmn_thread_write_reg_block(DMN_Handle handle, void *reg_block)
 {
+  return 0;
 }
 
 //- rjf: system process listing
@@ -166,6 +186,7 @@ dmn_process_iter_begin(DMN_ProcessIter *iter)
 internal B32
 dmn_process_iter_next(Arena *arena, DMN_ProcessIter *iter, DMN_ProcessInfo *info_out)
 {
+  return 0;
 }
 
 internal void