process: update signal handling

SIGTTIN/TTOU are not default fatal

diff --git a/Kernel/process.c b/Kernel/process.c
index 98ec0cc..0846ceb 100644 (file)
--- a/Kernel/process.c
+++ b/Kernel/process.c
@@ -26,9 +26,13 @@ void psleep(void *event)
        switch (udata.u_ptab->p_status) {
        case P_SLEEP:           // echo output from devtty happens while processes are still sleeping but in-context
                nready++;       /* We will fix this back up below */
-       case P_RUNNING: // normal process
+       case P_STOPPED:         // coming to a halt
+       case P_RUNNING:         // normal process
                break;
        default:
+#ifdef DEBUG
+               kprintf("psleep(0x%x) -> %d:%d", event, udata.u_ptab->p_pid, udata.u_ptab->p_status);
+#endif
                panic(PANIC_VOODOO);
        }
 
@@ -458,14 +462,17 @@ void chksigs(void)
                if (*svec == SIG_DFL) {
                        /* SIGCONT is subtle - we woke the process to handle
                           the signal so ignoring here works fine */
-                       if (j == SIGCHLD || j == SIGURG ||
+                       if (j == SIGCHLD || j == SIGURG || j == SIGSTOP ||
+#ifdef CONFIG_LEVEL_2
+                            j == SIGTTIN || j == SIGTTOU ||
+#endif
                            j == SIGIO || j == SIGCONT || udata.u_ptab->p_pid == 1) {
                                udata.u_ptab->p_pending &= ~m;  // unset the bit
                                continue;
                        }
                        /* FIXME: core dump on some signals */
 #ifdef DEBUG
-                       kputs("process terminated by signal: ");
+                       kprintf("process terminated by signal %d\n", j);
 #endif
                        doexit(0, j);
                } else if (*svec != SIG_IGN) {
@@ -496,7 +503,7 @@ void ssig(ptptr proc, uint16_t sig)
                /* SIGSTOP can't be ignored and puts the process into P_STOPPED */
                /* FIXME: Level 2 will need a lot more handling here, both SIGTSTP
                   handling and the wait() handling for stopping */
-               if (sig == SIGSTOP) {
+               if (sig == SIGSTOP || sig == SIGTTIN || sig == SIGTTOU) {
                        if (proc->p_status == P_RUNNING ||
                             proc->p_status == P_READY)
                                     nready--;