335 lines
8.0 KiB
C++
335 lines
8.0 KiB
C++
/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Set of functions to gather system information for the jack setup wizard.
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*
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* TODO: Test for rt prio availability
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*
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* @author Florian Faber, faber@faberman.de
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*
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**/
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/** maximum number of groups a user can be a member of **/
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#define MAX_GROUPS 100
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#include <fcntl.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 <grp.h>
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#include <sched.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <stdio.h>
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#include <errno.h>
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#include "systemtest.h"
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/**
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* This function checks for the existence of known frequency scaling mechanisms
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* in this system by testing for the availability of scaling governors/
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*
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* @returns 0 if the system has no frequency scaling capabilities non-0 otherwise.
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**/
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int system_has_frequencyscaling() {
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int fd;
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fd = open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors", O_RDONLY);
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if (-1==fd) {
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return 0;
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}
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(void) close(fd);
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return 1;
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}
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static int read_string(char* filename, char* buf, size_t buflen) {
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int fd;
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ssize_t r=-1;
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memset (buf, 0, buflen);
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fd = open (filename, O_RDONLY);
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if (-1<fd) {
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r = read (fd, buf, buflen-1);
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(void) close(fd);
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if (-1==r) {
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fprintf(stderr, "Error while reading \"%s\": %s\n", filename, strerror(errno));
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exit(EXIT_FAILURE);
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}
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}
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return (int) r;
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}
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static int read_int(char* filename, int* value) {
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char buf[20];
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if (0<read_string(filename, buf, 20)) {
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return (1==sscanf(buf, "%d", value));
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}
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return 0;
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}
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/**
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* This function determines wether any CPU core uses a variable clock speed if frequency
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* scaling is available. If the governor for all cores is either "powersave" or
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* "performance", the CPU frequency can be assumed to be static. This is also the case
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* if scaling_min_freq and scaling_max_freq are set to the same value.
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*
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* @returns 0 if system doesn't use frequency scaling at the moment, non-0 otherwise
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**/
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int system_uses_frequencyscaling() {
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int cpu=0, done=0, min, max;
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char filename[256], buf[256];
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while (!done) {
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(void) snprintf(filename, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpu);
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if (0<read_string(filename, buf, 256)) {
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if ((0!=strncmp("performance", buf, 11)) &&
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(0!=strncmp("powersafe", buf, 9))) {
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// So it's neither the "performance" nor the "powersafe" governor
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(void) snprintf(filename, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", cpu);
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if (read_int(filename, &min)) {
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(void) snprintf(filename, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", cpu);
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if (read_int(filename, &max)) {
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if (min!=max) {
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// wrong governor AND different frequency limits -> scaling
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return 1;
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}
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}
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}
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}
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} else {
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// couldn't open file -> no more cores
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done = 1;
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}
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cpu++;
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}
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// couldn't find anything that points to scaling
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return 0;
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}
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static gid_t get_group_by_name(const char* name) {
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struct group* grp;
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gid_t res = 0;
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while ((0==res) && (NULL != (grp = getgrent()))) {
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if (0==strcmp(name, grp->gr_name)) {
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res = grp->gr_gid;
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}
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}
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endgrent();
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return res;
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}
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/**
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* Tests wether the owner of this process is in the group 'name'.
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*
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* @returns 0 if the owner of this process is not in the group, non-0 otherwise
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**/
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int system_user_in_group(const char *name) {
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gid_t* list = (gid_t*) malloc(MAX_GROUPS * sizeof(gid_t));
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int num_groups, i=0, found=0;
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unsigned int gid;
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if (NULL==list) {
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perror("Cannot allocate group list structure");
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exit(EXIT_FAILURE);
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}
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gid = get_group_by_name(name);
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if (0==gid) {
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fprintf(stderr, "No %s group found\n", name);
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free(list);
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return 0;
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}
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num_groups = getgroups(MAX_GROUPS, list);
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while (i<num_groups) {
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if (list[i]==gid) {
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found = 1;
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i = num_groups;
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}
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i++;
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}
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free(list);
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return found;
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}
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/***
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* Checks for a definition in /etc/security/limits.conf that looks
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* as if it allows RT scheduling priority.
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*
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* @returns 1 if there appears to be such a line
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**/
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int system_has_rtprio_limits_conf ()
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{
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const char* limits = "/etc/security/limits.conf";
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char cmd[100];
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snprintf (cmd, sizeof (cmd), "grep -q 'rtprio *[0-9][0-9]*' %s", limits);
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if (system (cmd) == 0) {
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return 1;
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}
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return 0;
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}
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/**
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* Checks for the existence of the 'audio' group on this system
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*
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* @returns 0 if there is no 'audio' group, the group id otherwise
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**/
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int system_has_audiogroup() {
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return get_group_by_name("audio") || get_group_by_name ("jackuser");
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}
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/**
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* Checks for the existence of 'groupname' on this system
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*
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* @returns 0 if there is no group, the group id otherwise
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**/
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int system_has_group(const char * name) {
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return get_group_by_name(name);
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}
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/**
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* Tests wether the owner of this process is in the 'audio' group.
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*
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* @returns 0 if the owner of this process is not in the audio group, non-0 otherwise
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**/
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int system_user_in_audiogroup() {
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return system_user_in_group("audio") || system_user_in_group("jackuser");
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}
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/**
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* Determines wether the owner of this process can enable rt priority.
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*
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* @returns 0 if this process can not be switched to rt prio, non-0 otherwise
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**/
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int system_user_can_rtprio() {
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int min_prio;
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struct sched_param schparam;
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memset(&schparam, 0, sizeof(struct sched_param));
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if (-1 == (min_prio = sched_get_priority_min(SCHED_FIFO))) {
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perror("sched_get_priority");
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exit(EXIT_FAILURE);
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}
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schparam.sched_priority = min_prio;
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if (0 == sched_setscheduler(0, SCHED_FIFO, &schparam)) {
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// TODO: restore previous state
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schparam.sched_priority = 0;
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if (0 != sched_setscheduler(0, SCHED_OTHER, &schparam)) {
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perror("sched_setscheduler");
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exit(EXIT_FAILURE);
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}
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return 1;
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}
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return 0;
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}
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long long unsigned int system_memlock_amount() {
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struct rlimit limits;
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if (-1==getrlimit(RLIMIT_MEMLOCK, &limits)) {
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perror("getrlimit on RLIMIT_MEMLOCK");
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exit(EXIT_FAILURE);
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}
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return limits.rlim_max;
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}
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/**
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* Checks wether the memlock limit is unlimited
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*
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* @returns - 0 if the memlock limit is limited, non-0 otherwise
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**/
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int system_memlock_is_unlimited() {
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return ((RLIM_INFINITY==system_memlock_amount())?1:0);
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}
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long long unsigned int system_available_physical_mem() {
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char buf[256];
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long long unsigned int res = 0;
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if (0<read_string(const_cast<char*>("/proc/meminfo"), buf, sizeof (buf))) {
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if (strncmp (buf, "MemTotal:", 9) == 0) {
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if (sscanf (buf, "%*s %llu", &res) != 1) {
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perror ("parse error in /proc/meminfo");
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}
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}
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} else {
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perror("read from /proc/meminfo");
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}
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return res*1024;
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}
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/**
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* Gets the version of the currently running kernel. The string
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* returned has to be freed by the caller.
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*
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* @returns String with the full version of the kernel
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**/
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char* system_kernel_version() {
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return NULL;
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}
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char* system_get_username() {
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char* res = NULL;
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char* name = NULL;
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if ((name = getlogin())) {
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res = strdup(name);
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}
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return res;
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}
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