diff options
author | Paul Davis <paul@linuxaudiosystems.com> | 2011-01-31 14:45:56 +0000 |
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committer | Paul Davis <paul@linuxaudiosystems.com> | 2011-01-31 14:45:56 +0000 |
commit | 85b4ff8669c80e3af1f89b826e37a964c62ae51a (patch) | |
tree | 7827651610367ab3ac8d0965ffca66c8d7b2b02d /tools/sanity_check/systemtest.cpp | |
parent | d46766aefff101f05558c304c380e1b4aac40774 (diff) |
copy sanitycheck from 2.0-ongoing
git-svn-id: svn://localhost/ardour2/branches/3.0@8624 d708f5d6-7413-0410-9779-e7cbd77b26cf
Diffstat (limited to 'tools/sanity_check/systemtest.cpp')
-rw-r--r-- | tools/sanity_check/systemtest.cpp | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/tools/sanity_check/systemtest.cpp b/tools/sanity_check/systemtest.cpp new file mode 100644 index 0000000000..0a8cae2d5f --- /dev/null +++ b/tools/sanity_check/systemtest.cpp @@ -0,0 +1,333 @@ +/** + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Set of functions to gather system information for the jack setup wizard. + * + * TODO: Test for rt prio availability + * + * @author Florian Faber, faber@faberman.de + * + **/ + +/** maximum number of groups a user can be a member of **/ +#define MAX_GROUPS 100 + +#include <fcntl.h> + +#include <stdlib.h> +#include <sys/types.h> +#include <unistd.h> +#include <grp.h> + +#include <sched.h> +#include <string.h> + +#include <sys/time.h> +#include <sys/resource.h> + +#include <stdio.h> +#include <errno.h> + +#include "systemtest.h" + +/** + * This function checks for the existence of known frequency scaling mechanisms + * in this system by testing for the availability of scaling governors/ + * + * @returns 0 if the system has no frequency scaling capabilities non-0 otherwise. + **/ +int system_has_frequencyscaling() { + int fd; + + fd = open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors", O_RDONLY); + + if (-1==fd) { + return 0; + } + + (void) close(fd); + + return 1; +} + + +static int read_string(char* filename, char* buf, size_t buflen) { + int fd; + ssize_t r=-1; + + memset (buf, 0, buflen); + + fd = open (filename, O_RDONLY); + if (-1<fd) { + r = read (fd, buf, buflen-1); + (void) close(fd); + + if (-1==r) { + fprintf(stderr, "Error while reading \"%s\": %s\n", filename, strerror(errno)); + exit(EXIT_FAILURE); + } + } + + return (int) r; +} + + +static int read_int(char* filename, int* value) { + char buf[20]; + + if (0<read_string(filename, buf, 20)) { + return (1==sscanf(buf, "%d", value)); + } + + return 0; +} + + +/** + * This function determines wether any CPU core uses a variable clock speed if frequency + * scaling is available. If the governor for all cores is either "powersave" or + * "performance", the CPU frequency can be assumed to be static. This is also the case + * if scaling_min_freq and scaling_max_freq are set to the same value. + * + * @returns 0 if system doesn't use frequency scaling at the moment, non-0 otherwise + **/ +int system_uses_frequencyscaling() { + int cpu=0, done=0, min, max; + char filename[256], buf[256]; + + while (!done) { + (void) snprintf(filename, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpu); + if (0<read_string(filename, buf, 256)) { + if ((0!=strcmp("performance", buf)) && + (0!=strcmp("powersafe", buf))) { + // So it's neither the "performance" nor the "powersafe" governor + (void) snprintf(filename, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_min_freq", cpu); + if (read_int(filename, &min)) { + (void) snprintf(filename, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_max_freq", cpu); + if (read_int(filename, &max)) { + if (min!=max) { + // wrong governor AND different frequency limits -> scaling + return 1; + } + } + } + } + } else { + // couldn't open file -> no more cores + done = 1; + } + cpu++; + } + + // couldn't find anything that points to scaling + return 0; +} + + +static gid_t get_group_by_name(const char* name) { + struct group* grp; + gid_t res = 0; + + while ((0==res) && (NULL != (grp = getgrent()))) { + if (0==strcmp(name, grp->gr_name)) { + res = grp->gr_gid; + } + } + + endgrent(); + + return res; +} + +/** + * Tests wether the owner of this process is in the group 'name'. + * + * @returns 0 if the owner of this process is not in the group, non-0 otherwise + **/ +int system_user_in_group(const char *name) { + gid_t* list = (gid_t*) malloc(MAX_GROUPS * sizeof(gid_t)); + int num_groups, i=0, found=0; + unsigned int gid; + + if (NULL==list) { + perror("Cannot allocate group list structure"); + exit(EXIT_FAILURE); + } + + gid = get_group_by_name(name); + if (0==gid) { + fprintf(stderr, "No %s group found\n", name); + return 0; + } + + num_groups = getgroups(MAX_GROUPS, list); + + while (i<num_groups) { + if (list[i]==gid) { + found = 1; + i = num_groups; + } + + i++; + } + + free(list); + + return found; +} + + +/*** + * Checks for a definition in /etc/security/limits.conf that looks + * as if it allows RT scheduling priority. + * + * @returns 1 if there appears to be such a line + **/ +int system_has_rtprio_limits_conf () +{ + const char* limits = "/etc/security/limits.conf"; + char cmd[100]; + + snprintf (cmd, sizeof (cmd), "grep -q 'rtprio *[0-9][0-9]*' %s", limits); + if (system (cmd) == 0) { + return 1; + } + return 0; +} + + +/** + * Checks for the existence of the 'audio' group on this system + * + * @returns 0 if there is no 'audio' group, the group id otherwise + **/ +int system_has_audiogroup() { + return get_group_by_name("audio") || get_group_by_name ("jackuser"); +} + + +/** + * Checks for the existence of 'groupname' on this system + * + * @returns 0 if there is no group, the group id otherwise + **/ +int system_has_group(const char * name) { + return get_group_by_name(name); +} + + +/** + * Tests wether the owner of this process is in the 'audio' group. + * + * @returns 0 if the owner of this process is not in the audio group, non-0 otherwise + **/ +int system_user_in_audiogroup() { + return system_user_in_group("audio") || system_user_in_group("jackuser"); +} + + +/** + * Determines wether the owner of this process can enable rt priority. + * + * @returns 0 if this process can not be switched to rt prio, non-0 otherwise + **/ +int system_user_can_rtprio() { + int min_prio; + struct sched_param schparam; + + memset(&schparam, 0, sizeof(struct sched_param)); + + if (-1 == (min_prio = sched_get_priority_min(SCHED_RR))) { + perror("sched_get_priority"); + exit(EXIT_FAILURE); + } + schparam.sched_priority = min_prio; + + if (0 == sched_setscheduler(0, SCHED_RR, &schparam)) { + // TODO: restore previous state + schparam.sched_priority = 0; + if (0 != sched_setscheduler(0, SCHED_OTHER, &schparam)) { + perror("sched_setscheduler"); + exit(EXIT_FAILURE); + } + return 1; + } + + return 0; +} + + +long long unsigned int system_memlock_amount() { + struct rlimit limits; + + if (-1==getrlimit(RLIMIT_MEMLOCK, &limits)) { + perror("getrlimit on RLIMIT_MEMLOCK"); + exit(EXIT_FAILURE); + } + + return limits.rlim_max; +} + + +/** + * Checks wether the memlock limit is unlimited + * + * @returns - 0 if the memlock limit is limited, non-0 otherwise + **/ +int system_memlock_is_unlimited() { + return ((RLIM_INFINITY==system_memlock_amount())?1:0); +} + + +long long unsigned int system_available_physical_mem() { + char buf[256]; + long long unsigned int res = 0; + + if (0<read_string((char*)"/proc/meminfo", buf, sizeof (buf))) { + if (strncmp (buf, "MemTotal:", 9) == 0) { + if (sscanf (buf, "%*s %llu", &res) != 1) { + perror ("parse error in /proc/meminfo"); + } + } + } else { + perror("read from /proc/meminfo"); + } + + return res*1024; +} + + +/** + * Gets the version of the currently running kernel. The string + * returned has to be freed by the caller. + * + * @returns String with the full version of the kernel + **/ +char* system_kernel_version() { + return NULL; +} + + + +char* system_get_username() { + char* res = NULL; + char* name = NULL; + + if ((name = getlogin())) { + res = strdup(name); + } + + return res; +} |