CE process watching WIP

aux/qemu_amd64.sh

@@ -2,4 +2,4 @@
 
 set -x
 
-qemu-system-x86_64 -M pc -m 4G -serial stdio -enable-kvm -cdrom mop3.iso -smp 4 -boot d $@
+qemu-system-x86_64 -M pc -m 4G -serial stdio -enable-kvm -cdrom mop3.iso -smp 1 -boot d $@

ce/Makefile

@@ -9,7 +9,7 @@ $(eval $(call add_lib,libterminal))
 $(eval $(call add_lib,libfat))
 $(eval $(call add_lib,libmalloc))
 $(eval $(call add_lib,libdebugconsole))
-$(eval $(call add_include,libkb))
+$(eval $(call add_lib,libkb))
 
 cflags += -DPRINTF_INCLUDE_CONFIG_H=1
 

ce/ce.c

@@ -76,9 +76,11 @@ void app_main (void) {
 
     mprintf (PROMPT);
 
-    uint8_t ch = 0;
     for (;;) {
-      mail_receive (&ch, 1);
+      int ch = kb_read_key ();
+
+      if (ch == 0)
+        continue;
 
       if (ch == '\n')
         break;

ce/interp.c

@@ -342,10 +342,16 @@ static void help (struct context* context) {
 static void cmd_cancel_proc (void* arg) {
   int pid = (int)(uintptr_t)arg;
 
-  char ch = 0;
-  do {
-    mail_receive_nonblock (&ch, 1);
-  } while (ch != KB_CTRL ('C'));
+  int ch = 0;
+
+  for (;;) {
+    ch = kb_read_key_nonblock ();
+
+    if (ch == KB_CTRL ('C'))
+      break;
+    else
+      sched ();
+  }
 
   kill (pid);
 }
@@ -353,12 +359,15 @@ static void cmd_cancel_proc (void* arg) {
 static void cmd_collect_proc (void* arg) {
 #define RECV_MAX (1024 * 16)
 
+  (void)arg;
+
+  char recv[RECV_MAX];
   for (;;) {
-    char recv[RECV_MAX];
     memset (recv, 0, sizeof (recv));
-    if (mail_receive_nonblock (&recv, sizeof (recv) - 1) == ST_OK) {
+    if (mail_receive_nonblock (&recv, sizeof (recv) - 1) == ST_OK)
       mail_send (process_get_exec_pgid (), recv, strlen (recv));
-    }
+    else
+      sched ();
   }
 }
 
@@ -433,17 +442,16 @@ static void execute_cmd (struct ast_cmd* cmd, struct context* context) {
       }
     }
 
-    exec_partial_fini (pid);
-
-    struct process_data* cancel_pdata = process_spawn (&cmd_cancel_proc, (void*)pid);
     struct process_data* collect_pdata = process_spawn (&cmd_collect_proc, NULL);
+    struct process_data* cancel_pdata = process_spawn (&cmd_cancel_proc, (void*)pid);
 
+    exec_partial_fini (pid);
     wait_for_pid (pid);
 
-    kill (cancel_pdata->pid);
-    process_data_free (cancel_pdata);
     kill (collect_pdata->pid);
     process_data_free (collect_pdata);
+    kill (cancel_pdata->pid);
+    process_data_free (cancel_pdata);
   }
 }
 

include/devices.h

@@ -9,7 +9,8 @@
 #define TERMINAL_DIMENSIONS 1
 
 /* keyboard device */
-#define KB_READ_KEY 0
+#define KB_READ_KEY          0
+#define KB_READ_KEY_NONBLOCK 1
 
 /* drive devices */
 #define XDRV_TYPE_RAMDRV  0

init/Makefile

@@ -3,7 +3,6 @@ include ../make/ufuncs.mk
 $(eval $(call add_lib,libterminal))
 $(eval $(call add_lib,libprocess))
 $(eval $(call add_lib,libstring))
-$(eval $(call add_lib,libkb))
 $(eval $(call add_lib,libdebugconsole))
 $(eval $(call add_lib,libaux))
 $(eval $(call add_lib,libmalloc))

init/init.c

@@ -1,5 +1,4 @@
 #include <debugconsole.h>
-#include <kb.h>
 #include <limits.h>
 #include <malloc.h>
 #include <process.h>
@@ -30,14 +29,9 @@ void app_main (void) {
   int ce_pid = exec ("sys", "/ce");
   ce_pgid = get_procgroup (ce_pid);
 
-  process_spawn (&receiver, NULL);
+  struct process_data* pdata = process_spawn (&receiver, NULL);
 
-  for (;;) {
-    int ch = kb_read_key ();
+  wait_for_pid (pdata->pid);
 
-    if (ch == 0)
-      continue;
-
-    mail_send (ce_pgid, (uint8_t*)&ch, 1);
-  }
+  process_data_free (pdata);
 }

kernel/amd64/syscall.c

@@ -27,9 +27,11 @@ uintptr_t syscall_dispatch (void* stack_ptr) {
 
   spin_lock (&thiscpu->lock, &fc);
   struct proc* caller = thiscpu->proc_current;
-  int caller_pid = caller->pid;
+
   spin_lock (&caller->lock, &fp);
 
+  int caller_pid = caller->pid;
+
   memcpy (&caller->pdata.regs, regs, sizeof (struct saved_regs));
 
   fx_save (caller->pdata.fx_env);

kernel/device/device.c

@@ -188,6 +188,7 @@ static void ps2kb_device_init (void) {
 
   device_op_func_t ops[] = {
       [KB_READ_KEY] = &ps2kb_read_key,
+      [KB_READ_KEY_NONBLOCK] = &ps2kb_read_key_nonblock,
   };
   device_create ("kb", ops, lengthof (ops), &ps2kb_init, &ps2kb_fini, NULL, thiscpu->kproc, &rctx);
 }

kernel/device/ps2_kb.c

@@ -213,6 +213,33 @@ DEFINE_DEVICE_OP (ps2kb_read_key) {
   return ST_OK;
 }
 
+DEFINE_DEVICE_OP (ps2kb_read_key_nonblock) {
+  uint64_t frb, fsq;
+
+  uint8_t* chbuf = (uint8_t*)a1;
+
+  if (chbuf == NULL)
+    return -ST_BAD_ADDRESS_SPACE;
+
+  spin_lock (&ps2kb_ringbuffer_lock, &frb);
+
+  size_t prev_count = ps2kb_ringbuffer.count;
+
+  ringbuffer_pop (uint8_t, &ps2kb_ringbuffer, chbuf);
+
+  size_t new_count = ps2kb_ringbuffer.count;
+
+  /* didn't pop anything */
+  if (prev_count == new_count) {
+    spin_unlock (&ps2kb_ringbuffer_lock, frb);
+    return -ST_TRY_AGAIN;
+  }
+
+  spin_unlock (&ps2kb_ringbuffer_lock, frb);
+
+  return ST_OK;
+}
+
 static void ps2kb_set_typematic (uint8_t delay, uint8_t rate) {
   while (inb (KB_CTL_STATUS) & 0x02)
     ;

kernel/device/ps2_kb.h

@@ -11,6 +11,8 @@ struct device;
 
 DEFINE_DEVICE_OP (ps2kb_read_key);
 
+DEFINE_DEVICE_OP (ps2kb_read_key_nonblock);
+
 DEFINE_DEVICE_INIT (ps2kb_init);
 
 DEFINE_DEVICE_FINI (ps2kb_fini);

libkb/kb.c

@@ -13,3 +13,13 @@ int kb_read_key (void) {
   else
     return r;
 }
+
+int kb_read_key_nonblock (void) {
+  char ch = 0;
+  int r = device_do ("kb", KB_READ_KEY_NONBLOCK, &ch, NULL, NULL, NULL);
+
+  if (r == ST_OK)
+    return (int)ch;
+  else
+    return r;
+}

libkb/kb.h

@@ -5,9 +5,8 @@
 #include <kb_defs.h>
 #include <stdint.h>
 
-/* \brief Read key from keyboard
- * \return < 0 status on failure; ascii key on success
- */
 int kb_read_key (void);
 
+int kb_read_key_nonblock (void);
+
 #endif // _LIBKB_KB_H

libsystem/system.c

@@ -91,12 +91,12 @@ int create_volume (const char* key, int fs_type, const char* device_key) {
   return (int)do_syscall (SYS_CREATE_VOLUME, key, fs_type, device_key);
 }
 
-int env_set (int pid, const char* key, void* buffer, size_t len) {
-  return (int)do_syscall (SYS_ENV_SET, pid, key, buffer, len);
+int env_set (int pgid, const char* key, void* buffer, size_t len) {
+  return (int)do_syscall (SYS_ENV_SET, pgid, key, buffer, len);
 }
 
-int env_get (int pid, const char* key, void* buffer, size_t len) {
-  return (int)do_syscall (SYS_ENV_GET, pid, key, buffer, len);
+int env_get (int pgid, const char* key, void* buffer, size_t len) {
+  return (int)do_syscall (SYS_ENV_GET, pgid, key, buffer, len);
 }
 
 int exec_partial (const char* volume, const char* path) {

libsystem/system.h

@@ -97,10 +97,10 @@ int remove (const char* path);
 int create_volume (const char* key, int fs_type, const char* device_key);
 
 /* Set environment variable */
-int env_set (int pid, const char* key, void* buffer, size_t len);
+int env_set (int pgid, const char* key, void* buffer, size_t len);
 
 /* Get environment variable */
-int env_get (int pid, const char* key, void* buffer, size_t len);
+int env_get (int pgid, const char* key, void* buffer, size_t len);
 
 /* Prepare process for execution */
 int exec_partial (const char* volume, const char* path);

sdutil/Makefile

@@ -1,3 +1,10 @@
 include ../make/ufuncs.mk
 
+$(eval $(call add_lib,libstring))
+$(eval $(call add_lib,libprocess))
+$(eval $(call add_lib,libaux))
+$(eval $(call add_lib,libmalloc))
+
+cflags += -DPRINTF_INCLUDE_CONFIG_H=1
+
 include ../make/user.mk

sdutil/sdutil.c

@@ -1,3 +1,20 @@
+#include <mprintf.h>
+#include <process_self.h>
+#include <status.h>
 #include <system.h>
 
-void app_main (void) {}
+#define COMMAND_MAX 32
+
+void app_main (void) {
+  libprocess_self_init ();
+
+  char commandbuf[COMMAND_MAX];
+  commandbuf[0] = '\0';
+
+  mprintf ("HELLO!\n");
+
+  /* if (env_get (process_get_pgid (), "C", (void*)commandbuf, sizeof (commandbuf)) == ST_OK) { */
+  /* } */
+
+  /*   mprintf ("C=%s\n", commandbuf); */
+}

spin/spin.c

@@ -1,4 +1,6 @@
+#include <system.h>
+
 void app_main (void) {
   for (;;)
-    ;
+    sched ();
 }