From 7a8c01f304b673dd89923e05d242aebb9cd0a500 Mon Sep 17 00:00:00 2001
From: Benny Baumann <BenBE@geshi.org>
Date: Sun, 5 Feb 2023 02:40:42 +0100
Subject: Implement File Descriptor Meter support for
 DragonflyBSD/FreeBSD/NetBSD

---
 generic/fdstat_sysctl.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++
 generic/fdstat_sysctl.h | 13 ++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 generic/fdstat_sysctl.c
 create mode 100644 generic/fdstat_sysctl.h

(limited to 'generic')

diff --git a/generic/fdstat_sysctl.c b/generic/fdstat_sysctl.c
new file mode 100644
index 00000000..9e89a0da
--- /dev/null
+++ b/generic/fdstat_sysctl.c
@@ -0,0 +1,83 @@
+/*
+htop - generic/fdstat_sysctl.c
+(C) 2022-2023 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "generic/fdstat_sysctl.h"
+
+#include <math.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <sys/sysctl.h>
+#include <sys/types.h>
+
+#include "config.h"
+
+
+static void Generic_getFileDescriptors_sysctl_internal(
+   const char* sysctlname_maxfiles,
+   const char* sysctlname_numfiles,
+   size_t size_header,
+   size_t size_entry,
+   double* used,
+   double* max
+) {
+   *used = NAN;
+   *max = 65536;
+
+   int max_fd, open_fd;
+   size_t len;
+
+   len = sizeof(max_fd);
+   if (sysctlname_maxfiles && sysctlbyname(sysctlname_maxfiles, &max_fd, &len, NULL, 0) == 0) {
+      if (max_fd) {
+         *max = max_fd;
+      } else {
+         *max = NAN;
+      }
+   }
+
+   len = sizeof(open_fd);
+   if (sysctlname_numfiles && sysctlbyname(sysctlname_numfiles, &open_fd, &len, NULL, 0) == 0) {
+      *used = open_fd;
+   }
+
+   if (!isnan(*used)) {
+      return;
+   }
+
+   // If no sysctl arc available, try to guess from the file table size at kern.file
+   // The size per entry differs per OS, thus skip if we don't know:
+   if (!size_entry)
+      return;
+
+   len = 0;
+   if (sysctlbyname("kern.file", NULL, &len, NULL, 0) < 0)
+      return;
+
+   if (len < size_header)
+      return;
+
+   *used = (len - size_header) / size_entry;
+}
+
+void Generic_getFileDescriptors_sysctl(double* used, double* max) {
+#if defined(HTOP_DARWIN)
+   Generic_getFileDescriptors_sysctl_internal(
+      "kern.maxfiles", "kern.num_files", 0, 0, used, max);
+#elif defined(HTOP_DRAGONFLY)
+   Generic_getFileDescriptors_sysctl_internal(
+      "kern.maxfiles", NULL, 0, sizeof(struct kinfo_file), used, max);
+#elif defined(HTOP_FREEBSD)
+   Generic_getFileDescriptors_sysctl_internal(
+      "kern.maxfiles", "kern.openfiles", 0, 0, used, max);
+#elif defined(HTOP_NETBSD)
+   Generic_getFileDescriptors_sysctl_internal(
+      "kern.maxfiles", NULL, 0, sizeof(struct kinfo_file), used, max);
+#else
+#error Unknown platform: Please implement proper way to query open/max file information
+#endif
+}
diff --git a/generic/fdstat_sysctl.h b/generic/fdstat_sysctl.h
new file mode 100644
index 00000000..107fcabe
--- /dev/null
+++ b/generic/fdstat_sysctl.h
@@ -0,0 +1,13 @@
+#ifndef HEADER_fdstat_sysctl
+#define HEADER_fdstat_sysctl
+/*
+htop - generic/fdstat_sysctl.h
+(C) 2022-2023 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+
+void Generic_getFileDescriptors_sysctl(double* used, double* max);
+
+#endif
-- 
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