diff options
Diffstat (limited to 'cpufreq.c')
| -rw-r--r-- | cpufreq.c | 19 |
1 files changed, 18 insertions, 1 deletions
@@ -8,14 +8,20 @@ #define DIR_BUF_SIZE 1024 +// Validate if we found a file named cpu[0-9][0-9 int cpufreq_is_cpu(char *name) { if (strncmp(name,"cpu",3)!=0) return 0; if ((name[3]<'0') || (name[3]>'9')) return 0; + if (name[4]==0) return 1; - return 1; + if ((name[4]<'0') || (name[4]>'9')) return 0; + if (name[5]==0) return 1; + + return 0; } +// Set a cpufreq parameter to a value int cpufreq_set_str(char *parameter,char *value,int checkdelay) { int fd; @@ -37,6 +43,7 @@ int cpufreq_set_str(char *parameter,char *value,int checkdelay) 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) { @@ -46,18 +53,26 @@ int cpufreq_set_str(char *parameter,char *value,int checkdelay) while(1) { +// 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)) { DEBUG2_CPUFREQ("Found CPU %s\n",d->d_name); @@ -77,6 +92,8 @@ int cpufreq_set_str(char *parameter,char *value,int checkdelay) return done; } +// This is just a wrapper around cpufreq_set_str with long int to string +// convertion int cpufreq_set_long_int(char *parameter,long int value,int checkdelay) { char buf[255]; |