From 3907bbbcfb806799a5349e46a2b804307a0e9836 Mon Sep 17 00:00:00 2001
From: Jeremie Koenig <jk@jk.fr.eu.org>
Date: Tue, 17 Aug 2010 12:49:33 +0000
Subject: Add the list of processes as a directory

* proclist.h, proclist.c: New files.
* main.c: Add a proclist directory based on them.
* Makefile: Include the proclist module.
---
 Makefile   |  2 +-
 main.c     |  8 +++++++
 proclist.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 proclist.h |  2 ++
 4 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 proclist.c
 create mode 100644 proclist.h

diff --git a/Makefile b/Makefile
index ab6e406c..1fe7415b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 TARGET = procfs
-OBJS = procfs.o netfs.o procfs_file.o procfs_dir.o main.o
+OBJS = procfs.o netfs.o procfs_file.o procfs_dir.o proclist.o main.o
 LIBS = -lnetfs
 
 CC = gcc
diff --git a/main.c b/main.c
index 62e440d4..bc5c865c 100644
--- a/main.c
+++ b/main.c
@@ -1,21 +1,29 @@
 #include <mach.h>
+#include <hurd.h>
 #include <error.h>
 #include <argp.h>
 #include <hurd/netfs.h>
 #include "procfs.h"
 #include "procfs_file.h"
 #include "procfs_dir.h"
+#include "proclist.h"
 
 static struct node *make_file (void *dir_hook, void *ent_hook)
 {
   return procfs_file_make_node (ent_hook, -1, NULL);
 }
 
+static struct node *make_proclist (void *dir_hook, void *ent_hook)
+{
+  return proclist_make_node (getproc ());
+}
+
 int main (int argc, char **argv)
 {
   static const struct procfs_dir_entry entries[] = {
     { "hello",		make_file,	"Hello, World!\n" },
     { "goodbye",	make_file,	"Goodbye, cruel World!\n" },
+    { "proclist",	make_proclist,	},
     { }
   };
   mach_port_t bootstrap;
diff --git a/proclist.c b/proclist.c
new file mode 100644
index 00000000..4dd6ab31
--- /dev/null
+++ b/proclist.c
@@ -0,0 +1,81 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <mach.h>
+#include <hurd/process.h>
+#include "procfs.h"
+#include "procfs_file.h"
+#include "procfs_dir.h"
+
+#define PID_STR_SIZE (3 * sizeof (pid_t) + 1)
+
+struct proclist_node
+{
+  process_t process;
+};
+
+static error_t
+proclist_get_contents (void *hook, void **contents, size_t *contents_len)
+{
+  struct proclist_node *pl = hook;
+  pidarray_t pids;
+  mach_msg_type_number_t num_pids;
+  error_t err;
+  int i;
+
+  num_pids = 0;
+  err = proc_getallpids (pl->process, &pids, &num_pids);
+  if (err)
+    return EIO;
+
+  *contents = malloc (num_pids * PID_STR_SIZE);
+  if (*contents)
+    {
+      *contents_len = 0;
+      for (i=0; i < num_pids; i++)
+	{
+	  int n = sprintf (*contents + *contents_len, "%d", pids[i]);
+	  assert (n >= 0);
+	  *contents_len += (n + 1);
+	}
+    }
+  else
+    err = ENOMEM;
+
+  vm_deallocate (mach_task_self (), (vm_address_t) pids, num_pids * sizeof pids[0]);
+  return err;
+}
+
+static error_t
+proclist_lookup (void *hook, const char *name, struct node **np)
+{
+  *np = procfs_file_make_node ("Ceci n'est pas un processus\n", -1, NULL);
+  return *np ? 0 : ENOMEM;
+}
+
+struct node *
+proclist_make_node (process_t process)
+{
+  static const struct procfs_node_ops ops = {
+    .get_contents = proclist_get_contents,
+    .lookup = proclist_lookup,
+    .cleanup_contents = free,
+    .cleanup = free,
+  };
+  struct proclist_node *pl;
+  struct node *np;
+
+  pl = malloc (sizeof *pl);
+  if (! pl)
+    return NULL;
+
+  memset (pl, 0, sizeof *pl);
+  pl->process = process;
+
+  np = procfs_make_node (&ops, pl);
+  if (! np)
+    free (pl);
+
+  return np;
+}
+
diff --git a/proclist.h b/proclist.h
new file mode 100644
index 00000000..a766d50e
--- /dev/null
+++ b/proclist.h
@@ -0,0 +1,2 @@
+#include <hurd/hurd_types.h>
+struct node *proclist_make_node (process_t process);
-- 
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