[libgtop] Cygwin: Add private mountlist support.

[Benoît Dejean <bdejean src gnome org>]

commit 3cc7b3aecba95741e01327f071c90b1763c97af2
Author: Yaakov Selkowitz <yselkowitz users sourceforge net>
Date:   Wed Jun 16 15:06:27 2010 -0500

    Cygwin: Add private mountlist support.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=621820

 libgtop-sysdeps.m4         |    1 +
 sysdeps/cygwin/Makefile.am |    2 +-
 sysdeps/cygwin/mountlist.c |  164 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 166 insertions(+), 1 deletions(-)
---
diff --git a/libgtop-sysdeps.m4 b/libgtop-sysdeps.m4
index 6061fd9..e960cae 100644
--- a/libgtop-sysdeps.m4
+++ b/libgtop-sysdeps.m4
@@ -108,6 +108,7 @@ AC_DEFUN([GNOME_LIBGTOP_SYSDEPS],[
 	  libgtop_use_machine_h=no
 	  libgtop_need_server=no
 	  libgtop_have_sysinfo=yes
+	  libgtop_sysdeps_private_mountlist=yes
 	  ;;
 	*)
 	  if test x$hacker_mode = xyes ; then
diff --git a/sysdeps/cygwin/Makefile.am b/sysdeps/cygwin/Makefile.am
index 2701c9d..ec232f6 100644
--- a/sysdeps/cygwin/Makefile.am
+++ b/sysdeps/cygwin/Makefile.am
@@ -3,7 +3,7 @@ INCLUDES			= @INCLUDES@
 noinst_LTLIBRARIES		= libgtop_sysdeps-2.0.la
 
 libgtop_sysdeps_2_0_la_SOURCES	= open.c close.c cpu.c mem.c swap.c \
-				  uptime.c loadavg.c shm_limits.c msg_limits.c \
+				  uptime.c loadavg.c mountlist.c shm_limits.c msg_limits.c \
 				  sem_limits.c proclist.c procstate.c procuid.c \
 				  proctime.c procmem.c procsignal.c prockernel.c \
 				  procsegment.c procargs.c procmap.c siglist.c \
diff --git a/sysdeps/cygwin/mountlist.c b/sysdeps/cygwin/mountlist.c
new file mode 100644
index 0000000..f6b2e20
--- /dev/null
+++ b/sysdeps/cygwin/mountlist.c
@@ -0,0 +1,164 @@
+/* mountlist.c -- return a list of mounted filesystems
+   Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+
+   This file is a fork of sysdeps/common/mountlist.c.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+
+/*
+Local Variables:
+mode: C
+c-file-style: "gnu"
+End:
+*/
+
+#include <config.h>
+
+#include <stdio.h>
+#include <mntent.h>
+
+#include <glibtop.h>
+#include <glibtop/mountlist.h>
+#include <glibtop/error.h>
+
+
+/* IgnoreList */
+
+
+typedef struct
+{
+  GHashTable *table;
+} IgnoreList;
+
+
+static IgnoreList*
+ignore_list_new(void)
+{
+  IgnoreList* ig;
+  ig = g_new(IgnoreList, 1);
+  ig->table = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
+  return ig;
+}
+
+
+static void
+ignore_list_delete(IgnoreList* ig)
+{
+  if (ig) {
+    g_hash_table_destroy(ig->table);
+    g_free(ig);
+  }
+}
+
+
+static void
+ignore_list_add(IgnoreList* ig, const char* fs)
+{
+  g_hash_table_insert(ig->table, g_strdup(fs), GINT_TO_POINTER(1));
+}
+
+
+static gboolean
+ignore_list_has(IgnoreList* ig, const char* fs)
+{
+  gpointer data;
+  data = g_hash_table_lookup(ig->table, fs);
+  return data != NULL;
+}
+
+
+/* ~IgnoreList */
+
+
+static gboolean
+ignore_fs(const char *fstype, IgnoreList** ig)
+{
+  if (!*ig) {
+    FILE* fs;
+    char line[128];
+
+    *ig = ignore_list_new();
+
+    ignore_list_add(*ig, "none");
+
+    if ((fs = fopen("/proc/filesystems", "r")) != NULL) {
+      while (fgets(line, sizeof line, fs)) {
+	if (!strncmp(line, "nodev", 5)) {
+	  char *type;
+	  type = g_strstrip(line + 5);
+	  ignore_list_add(*ig, type);
+	}
+      }
+      fclose(fs);
+    }
+  }
+
+  return ignore_list_has(*ig, fstype);
+}
+
+
+glibtop_mountentry *
+glibtop_get_mountlist_s(glibtop *server, glibtop_mountlist *buf, int all_fs)
+{
+  const struct mntent *mnt;
+  FILE *fp;
+  GArray* entries;
+  IgnoreList* ig = NULL;
+
+  memset(buf, 0, sizeof(glibtop_mountlist));
+
+  /* wild guess, preallocate 8 entries
+     on a desktop, almost everyone has / and a tmpfs for udev
+     if all_fs, there are also proc, sys, fuse, binfmt, etc */
+  entries = g_array_sized_new(FALSE, FALSE, sizeof(glibtop_mountentry), 8);
+
+  if (!(fp = setmntent(MOUNTED, "r"))) {
+      glibtop_warn_io_r(server, "Could not open %s", MOUNTED);
+      goto out;
+    }
+
+  while ((mnt = getmntent(fp)))
+    {
+      glibtop_mountentry *me;
+      gsize len;
+
+      if (!all_fs && ignore_fs(mnt->mnt_type, &ig))
+	continue;
+
+      len = entries->len;
+      g_array_set_size(entries, len + 1);
+      me = &g_array_index(entries, glibtop_mountentry, len);
+
+      g_strlcpy(me->devname, mnt->mnt_fsname, sizeof me->devname);
+      g_strlcpy(me->mountdir, mnt->mnt_dir, sizeof me->mountdir);
+      g_strlcpy(me->type, mnt->mnt_type, sizeof me->type);
+    }
+
+    endmntent(fp);
+
+
+  out:
+    ignore_list_delete(ig);
+
+    buf->size = sizeof(glibtop_mountentry);
+    buf->number = entries->len;
+    buf->total = buf->number * buf->size;
+    buf->flags = (1 << GLIBTOP_MOUNTLIST_SIZE)
+    | (1 << GLIBTOP_MOUNTLIST_NUMBER)
+    | (1 << GLIBTOP_MOUNTLIST_TOTAL);
+
+  return (glibtop_mountentry*) g_array_free(entries, FALSE);
+}