112 lines
2.4 KiB
C
112 lines
2.4 KiB
C
/*
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* vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string.h>
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#ifdef __FreeBSD__
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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static int sys_cpu_setall(const char *control, const char *value);
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int
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main(int argc, char *argv[])
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{
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if (argc != 3)
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{
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fprintf(stderr, "Invalid command. Syntax:\n");
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fprintf(stderr, "\tfreqset <frequency|governor> <freq-level|governor-name>\n");
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return 1;
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}
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if (seteuid(0))
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{
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fprintf(stderr, "Unable to assume root privileges\n");
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}
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#ifdef __FreeBSD__
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if (!strcmp(argv[1], "frequency"))
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{
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int new_frequency = atoi(argv[2]);
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int len = 4;
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if (sysctlbyname("dev.cpu.0.freq", NULL, 0, &new_frequency, &len) == -1)
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{
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fprintf(stderr, "Unable to open frequency interface for writing.\n");
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return 1;
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}
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return 0;
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}
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else if (!strcmp(argv[1], "governor"))
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{
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fprintf(stderr, "Governors not (yet) implemented on FreeBSD.\n");
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return 0;
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}
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else
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{
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fprintf(stderr, "Unknown command.\n");
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return 1;
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}
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#else
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if (!strcmp(argv[1], "frequency"))
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{
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if (sys_cpu_setall("scaling_setspeed", argv[2]) == 0)
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{
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fprintf(stderr, "Unable to open frequency interface for writing.\n");
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return 1;
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}
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return 0;
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}
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else if (!strcmp(argv[1], "governor"))
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{
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if (sys_cpu_setall("scaling_governor", argv[2]) == 0)
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{
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fprintf(stderr, "Unable to open governor interface for writing.\n");
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return 1;
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}
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if (!strcmp(argv[2], "ondemand"))
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sys_cpu_setall("ondemand/ignore_nice_load", "0");
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else if (!strcmp(argv[2], "conservative"))
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sys_cpu_setall("conservative/ignore_nice_load", "0");
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return 0;
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}
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else
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{
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fprintf(stderr, "Unknown command.\n");
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return 1;
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}
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#endif
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seteuid(-1);
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return -1;
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}
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static int
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sys_cpu_setall(const char *control, const char *value)
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{
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int num = 0;
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char filename[4096];
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FILE *f;
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while (1)
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{
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snprintf(filename, sizeof(filename), "/sys/devices/system/cpu/cpu%i/cpufreq/%s", num, control);
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f = fopen(filename, "w");
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if (!f)
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{
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return(num);
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}
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fprintf(f, "%s\n", value);
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fclose(f);
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num++;
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}
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return -1;
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}
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