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demon/linux: halting, sigstop cases

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This commit is contained in:
Ryan Fleury
2025-07-28 17:47:50 -07:00
parent 64c2d98ede
commit 0e9f2ee03c
2 changed files with 45 additions and 0 deletions
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src/demon/linux/demon_core_linux.c
+40
View File
@@ -962,6 +962,7 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
int status = 0;
pid_t wait_id = waitpid(-1, &status, __WALL);
final_wait_pid = wait_id;
done = 1;
//- rjf: unpack event
int wifexited = WIFEXITED(status);
@@ -1012,10 +1013,35 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
//- rjf: WSTOPSIG(status) is SIGSTOP
if(wifstopped && wstopsig == SIGSTOP)
{
//
// TODO(rjf): how do we tell the following apart?:
// - SIGSTOP All-Stop
// - SIGSTOP Halt
// - SIGSTOP "User"
//
// we are currently just assuming that, if we've queried a SIGSTOP to halt, then
// the first one that comes back is our "dummy" sigstop. this is likely not
// necessarily true.
//
if(thread->expecting_dummy_sigstop)
{
thread->expecting_dummy_sigstop = 0;
done = 0;
}
else if(dmn_lnx_state->has_halt_injection)
{
DMN_Event *e = dmn_event_list_push(arena, &evts);
e->kind = DMN_EventKind_Halt;
e->process = dmn_lnx_handle_from_entity(process);
e->thread = dmn_lnx_handle_from_entity(thread);
}
else
{
// TODO(rjf): study this case; old notes:
//
// a signal we don't want to mess with (except to record that it
// happened maybe) we should "hand it back"
}
}
//- rjf: WSTOPSIG(status) is an unrecoverable exception (unless user does something to fix state first)
@@ -1103,6 +1129,20 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
internal void
dmn_halt(U64 code, U64 user_data)
{
if(!dmn_lnx_state->has_halt_injection)
{
DMN_LNX_Entity *process = dmn_lnx_state->entities_base->first;
if(process != &dmn_lnx_nil_entity)
{
union sigval sv = {0};
if(sigqueue(process->id, SIGSTOP, sv) != -1)
{
dmn_lnx_state->has_halt_injection = 1;
dmn_lnx_state->halt_code = code;
dmn_lnx_state->halt_user_data = user_data;
}
}
}
}
////////////////////////////////
src/demon/linux/demon_core_linux.h
+5
View File
@@ -109,6 +109,11 @@ struct DMN_LNX_State
DMN_LNX_Entity *entities_base;
U64 entities_count;
DMN_LNX_Entity *free_entity;
// rjf: halting mechanism
B32 has_halt_injection;
U64 halt_code;
U64 halt_user_data;
};
read_only global DMN_LNX_Entity dmn_lnx_nil_entity = {&dmn_lnx_nil_entity, &dmn_lnx_nil_entity, &dmn_lnx_nil_entity, &dmn_lnx_nil_entity, &dmn_lnx_nil_entity};