From ab2d1b31b715f817ea1d16c67743b54fb5f79107 Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Sun, 28 Jul 2024 15:13:52 +0200
Subject: Rewrite cpufreq_set_str to use opendir/readdir/closedir

---
 cpufreq.c | 69 +++++++++++++++++++--------------------------------------------
 1 file changed, 21 insertions(+), 48 deletions(-)

diff --git a/cpufreq.c b/cpufreq.c
index df21b36..c683d6c 100644
--- a/cpufreq.c
+++ b/cpufreq.c
@@ -3,6 +3,8 @@
 #include <unistd.h>
 #include <string.h>
 #include <stdio.h>
+#include <dirent.h>
+#include <sys/types.h>
 #include "debug.h"
 #include "sysfs.h"
 
@@ -24,70 +26,41 @@ int cpufreq_is_cpu(char *name)
 // Set a cpufreq parameter to a value
 int cpufreq_set_str(char *parameter,char *value,long int checkdelay)
 {
- int fd;
+ DIR *cpudir;
+ struct dirent *cpu_dirent;
  char sysfs_file[128];
  int done=0;
 
  DEBUG1_CPUFREQ("Set %s to %s\n",parameter,value)
 
- char buf[DIR_BUF_SIZE];
- long nread;
-
- struct linux_dirent {
-  unsigned long d_ino;
-  off_t d_off;
-  unsigned short d_reclen;
-  char d_name[];
- };
-
- struct linux_dirent *d;
- size_t bpos;
-
 // Open the CPU directory in sysfs
- fd=open("/sys/devices/system/cpu",O_RDONLY|O_DIRECTORY);
- if (fd==-1)
+ cpudir=opendir("/sys/devices/system/cpu");
+ if (cpudir==NULL)
  {
   DEBUG1_CPUFREQ("Unable to find CPU's\n");
   return -1;
  }
 
- while(1)
+ cpu_dirent=readdir(cpudir);
+ while(cpu_dirent!=NULL)
  {
-// Iterate over SYS_getdents calls
-  nread=syscall(SYS_getdents,fd,buf,DIR_BUF_SIZE);
-
-// If we can't read return an error
-  if (nread==-1)
-  {
-   DEBUG1_CPUFREQ("Unable to find CPU's\n");
-   close(fd);
-   return -1;
-  }
-
-// If there are no entries left we're done
-  if (nread==0) break;
-
-// Iterate over returned file info
-  for(bpos=0;bpos<nread;)
-  {
-   d=(struct linux_dirent *)(buf+bpos);
-
 // If it's a CPU, set our parameter
-   if (cpufreq_is_cpu(d->d_name))
+  if (cpufreq_is_cpu(cpu_dirent->d_name))
+  {
+   DEBUG2_CPUFREQ("Found CPU %s\n",cpu_dirent->d_name);
+   snprintf(sysfs_file,128,"/sys/devices/system/cpu/%s/cpufreq/%s",cpu_dirent->d_name,parameter);
+   if (sysfs_write_str(sysfs_file,value,checkdelay)!=0)
    {
-    DEBUG2_CPUFREQ("Found CPU %s\n",d->d_name);
-    snprintf(sysfs_file,128,"/sys/devices/system/cpu/%s/cpufreq/%s",d->d_name,parameter);
-    if (sysfs_write_str(sysfs_file,value,checkdelay)!=0)
-    {
-     DEBUG1_CPUFREQ("Failed to set %s\n",d->d_name);
-     return -1;
-    }
-    done++;
+    DEBUG1_CPUFREQ("Failed to set %s\n",cpu_dirent->d_name);
+    closedir(cpudir);
+    return -1;
    }
-   bpos+=d->d_reclen;
-  } 
+   done++;
+  }
+
+  cpu_dirent=readdir(cpudir);
  }
- close(fd);
+ closedir(cpudir);
 
  return done;
 }
-- 
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