New root files: version, uptime, stat

* rootdir.c, rootdir.h: New files.
* main.c: Use rootdir_create_node.
* Makefile: Add the rootdir module.

1 files changed, 159 insertions, 0 deletions

diff --git a/rootdir.c b/rootdir.c
new file mode 100644
index 00000000..fb48b932
--- /dev/null
+++ b/rootdir.c
@@ -0,0 +1,159 @@
+#include <mach/vm_statistics.h>
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/utsname.h>
+#include <ps.h>
+#include "procfs.h"
+#include "procfs_dir.h"
+
+/* This implements a directory node with the static files in /proc */
+
+#define INIT_PID 1
+
+static error_t
+get_boottime (struct ps_context *pc, struct timeval *tv)
+{
+  struct proc_stat *ps;
+  error_t err;
+
+  err = _proc_stat_create (INIT_PID, pc, &ps);
+  if (err)
+    return err;
+
+  err = proc_stat_set_flags (ps, PSTAT_TASK_BASIC);
+  if (err || !(proc_stat_flags (ps) & PSTAT_TASK_BASIC))
+    err = EIO;
+
+  if (! err)
+    {
+      task_basic_info_t tbi = proc_stat_task_basic_info (ps);
+      tv->tv_sec = tbi->creation_time.seconds;
+      tv->tv_usec = tbi->creation_time.microseconds;
+    }
+
+  _proc_stat_free (ps);
+  return err;
+}
+
+static error_t
+rootdir_gc_version (void *hook, void **contents, size_t *contents_len)
+{
+  struct utsname uts;
+  int r;
+
+  r = uname (&uts);
+  if (r < 0)
+    return errno;
+
+  *contents_len = asprintf ((char **) contents,
+      "Linux version 2.6.1 (%s %s %s %s)\n",
+      uts.sysname, uts.release, uts.version, uts.machine);
+
+  return *contents_len >= 0 ? 0 : ENOMEM;
+}
+
+/* Uptime -- we use the start time of init to deduce it. This is probably a bit
+   fragile, as any clock update will make the result inaccurate. */
+static error_t
+rootdir_gc_uptime (void *hook, void **contents, size_t *contents_len)
+{
+  struct timeval time, boottime;
+  double up_secs;
+  error_t err;
+
+  err = gettimeofday (&time, NULL);
+  if (err < 0)
+    return errno;
+
+  err = get_boottime (hook, &boottime);
+  if (err)
+    return err;
+
+  timersub (&time, &boottime, &time);
+  up_secs = time.tv_sec + time.tv_usec / 1000000.;
+
+  /* The second field is the total idle time. As far as I know we don't
+     keep track of it. */
+  *contents_len = asprintf ((char **) contents, "%.2lf %.2lf\n", up_secs, 0.);
+
+  return *contents_len >= 0 ? 0 : ENOMEM;
+}
+
+static error_t
+rootdir_gc_stat (void *hook, void **contents, size_t *contents_len)
+{
+  struct timeval boottime;
+  struct vm_statistics vmstats;
+  error_t err;
+
+  err = get_boottime (hook, &boottime);
+  if (err)
+    return err;
+
+  err = vm_statistics (mach_task_self (), &vmstats);
+  if (err)
+    return EIO;
+
+  *contents_len = asprintf ((char **) contents,
+      /* Does Mach keeps track of any of this? */
+      "cpu  0 0 0 0 0 0 0 0 0\n"
+      "cpu0 0 0 0 0 0 0 0 0 0\n"
+      "intr 0\n"
+      /* This we know. */
+      "page %d %d\n"
+      "btime %lu\n",
+      vmstats.pageins, vmstats.pageouts,
+      boottime.tv_sec);
+
+  return *contents_len >= 0 ? 0 : ENOMEM;
+}
+
+static struct node *
+rootdir_file_make_node (void *dir_hook, void *entry_hook)
+{
+  return procfs_make_node (entry_hook, dir_hook);
+}
+
+static struct procfs_dir_entry rootdir_entries[] = {
+  {
+    .name = "version",
+    .make_node = rootdir_file_make_node,
+    .hook = & (struct procfs_node_ops) {
+      .get_contents = rootdir_gc_version,
+      .cleanup_contents = procfs_cleanup_contents_with_free,
+    },
+  },
+  {
+    .name = "uptime",
+    .make_node = rootdir_file_make_node,
+    .hook = & (struct procfs_node_ops) {
+      .get_contents = rootdir_gc_uptime,
+      .cleanup_contents = procfs_cleanup_contents_with_free,
+    },
+  },
+  {
+    .name = "stat",
+    .make_node = rootdir_file_make_node,
+    .hook = & (struct procfs_node_ops) {
+      .get_contents = rootdir_gc_stat,
+      .cleanup_contents = procfs_cleanup_contents_with_free,
+    },
+  },
+  {}
+};
+
+error_t
+rootdir_create_node (struct node **np)
+{
+  struct ps_context *pc;
+  error_t err;
+
+  err = ps_context_create (getproc (), &pc);
+  if (err)
+    return err;
+
+  *np = procfs_dir_make_node (rootdir_entries, pc,
+			      (void (*)(void *)) ps_context_free);
+  return 0;
+}
+