From 29ec1151436bd539dc659a394622cdd2d672f975 Mon Sep 17 00:00:00 2001
From: Benny Baumann <BenBE@geshi.org>
Date: Mon, 7 Sep 2020 11:53:58 +0200
Subject: [PATCH] Update IO rate display to use NAN on error

---
 Process.c                |  2 +-
 linux/LinuxProcess.c     | 13 ++++++++++---
 linux/LinuxProcessList.c |  4 ++--
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/Process.c b/Process.c
index 428e121f..839db8d7 100644
--- a/Process.c
+++ b/Process.c
@@ -219,7 +219,7 @@ void Process_outputRate(RichString* str, char* buffer, int n, double rate, int c
       largeNumberColor = CRT_colors[PROCESS];
       processMegabytesColor = CRT_colors[PROCESS];
    }
-   if (rate == -1) {
+   if (isnan(rate)) {
       int len = snprintf(buffer, n, "    no perm ");
       RichString_appendn(str, CRT_colors[PROCESS_SHADOW], buffer, len);
    } else if (rate < ONE_K) {
diff --git a/linux/LinuxProcess.c b/linux/LinuxProcess.c
index 9dd3b93d..ccdb9da8 100644
--- a/linux/LinuxProcess.c
+++ b/linux/LinuxProcess.c
@@ -17,6 +17,7 @@ in the source distribution for its full text.
 #include <string.h>
 #include <sys/syscall.h>
 #include <time.h>
+#include <math.h>
 
 /* semi-global */
 long long btime;
@@ -237,9 +238,15 @@ void LinuxProcess_writeField(Process* this, RichString* str, ProcessField field)
    case IO_READ_RATE:  Process_outputRate(str, buffer, n, lp->io_rate_read_bps, coloring); return;
    case IO_WRITE_RATE: Process_outputRate(str, buffer, n, lp->io_rate_write_bps, coloring); return;
    case IO_RATE: {
-      double totalRate = (lp->io_rate_read_bps != -1)
-                       ? (lp->io_rate_read_bps + lp->io_rate_write_bps)
-                       : -1;
+      double totalRate = NAN;
+      if(!isnan(lp->io_rate_read_bps) && !isnan(lp->io_rate_write_bps))
+         totalRate = lp->io_rate_read_bps + lp->io_rate_write_bps;
+      else if(!isnan(lp->io_rate_read_bps))
+         totalRate = lp->io_rate_read_bps;
+      else if(!isnan(lp->io_rate_write_bps))
+         totalRate = lp->io_rate_write_bps;
+      else
+         totalRate = NAN;
       Process_outputRate(str, buffer, n, totalRate, coloring); return;
    }
    #endif
diff --git a/linux/LinuxProcessList.c b/linux/LinuxProcessList.c
index 8333da50..33248b50 100644
--- a/linux/LinuxProcessList.c
+++ b/linux/LinuxProcessList.c
@@ -331,8 +331,8 @@ static void LinuxProcessList_readIoFile(LinuxProcess* process, const char* dirna
    xSnprintf(filename, MAX_NAME, "%s/%s/io", dirname, name);
    int fd = open(filename, O_RDONLY);
    if (fd == -1) {
-      process->io_rate_read_bps = -1;
-      process->io_rate_write_bps = -1;
+      process->io_rate_read_bps = NAN;
+      process->io_rate_write_bps = NAN;
       process->io_rchar = -1LL;
       process->io_wchar = -1LL;
       process->io_syscr = -1LL;