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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/* This module provides a separate process to run system().
* The communication between this process and the main processing
* is done through unix pipes.
*
* Motivation: the UE sets its IP address using system() and
* that disrupts realtime processing in some cases. Having a
* separate process solves this problem.
*/
#define _GNU_SOURCE
#include "system.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <common/utils/assertions.h>
#include <common/utils/LOG/log.h>
#define MAX_COMMAND 4096
static int command_pipe_read;
static int command_pipe_write;
static int result_pipe_read;
static int result_pipe_write;
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static int module_initialized = 0;
/********************************************************************/
/* util functions */
/********************************************************************/
static void lock_system(void) {
if (pthread_mutex_lock(&lock) != 0) {
printf("pthread_mutex_lock fails\n");
abort();
}
}
static void unlock_system(void) {
if (pthread_mutex_unlock(&lock) != 0) {
printf("pthread_mutex_unlock fails\n");
abort();
}
}
static void write_pipe(int p, char *b, int size) {
while (size) {
int ret = write(p, b, size);
if (ret <= 0) exit(0);
b += ret;
size -= ret;
}
}
static void read_pipe(int p, char *b, int size) {
while (size) {
int ret = read(p, b, size);
if (ret <= 0) exit(0);
b += ret;
size -= ret;
}
}
int checkIfFedoraDistribution(void) {
return system("grep -iq 'ID_LIKE.*fedora' /etc/os-release ");
}
int checkIfGenericKernelOnFedora(void) {
int ret=system("uname -a | grep -q rt");
return 1 - ret;
}
int checkIfInsideContainer(void) {
int res=system("egrep -q 'libpod|podman|kubepods' /proc/self/cgroup");
if (res > 0)
return 1;
else
return 0;
}
/********************************************************************/
/* background process */
/********************************************************************/
/* This function is run by background process. It waits for a command,
* runs it, and reports status back. It exits (in normal situations)
* when the main process exits, because then a "read" on the pipe
* will return 0, in which case "read_pipe" exits.
*/
static void background_system_process(void) {
int len;
int ret;
char command[MAX_COMMAND+1];
while (1) {
read_pipe(command_pipe_read, (char *)&len, sizeof(int));
read_pipe(command_pipe_read, command, len);
ret = system(command);
write_pipe(result_pipe_write, (char *)&ret, sizeof(int));
}
}
/********************************************************************/
/* background_system() */
/* return -1 on error, 0 on success */
/********************************************************************/
int background_system(char *command) {
int res;
int len;
if (module_initialized == 0) {
printf("FATAL: calling 'background_system' but 'start_background_system' was not called\n");
abort();
}
len = strlen(command)+1;
if (len > MAX_COMMAND) {
printf("FATAL: command too long. Increase MAX_COMMAND (%d).\n", MAX_COMMAND);
printf("command was: '%s'\n", command);
abort();
}
/* only one command can run at a time, so let's lock/unlock */
lock_system();
write_pipe(command_pipe_write, (char *)&len, sizeof(int));
write_pipe(command_pipe_write, command, len);
read_pipe(result_pipe_read, (char *)&res, sizeof(int));
unlock_system();
if (res == -1 || !WIFEXITED(res) || WEXITSTATUS(res) != 0) return -1;
return 0;
}
/********************************************************************/
/* start_background_system() */
/* initializes the "background system" module */
/* to be called very early by the main processing */
/********************************************************************/
void start_background_system(void) {
int p[2];
pid_t son;
if (module_initialized == 1)
return;
module_initialized = 1;
if (pipe(p) == -1) {
perror("pipe");
exit(1);
}
command_pipe_read = p[0];
command_pipe_write = p[1];
if (pipe(p) == -1) {
perror("pipe");
exit(1);
}
result_pipe_read = p[0];
result_pipe_write = p[1];
son = fork();
if (son == -1) {
perror("fork");
exit(1);
}
if (son) {
close(result_pipe_write);
close(command_pipe_read);
return;
}
close(result_pipe_read);
close(command_pipe_write);
background_system_process();
}
void threadCreate(pthread_t* t, void * (*func)(void*), void * param, char* name, int affinity, int priority){
pthread_attr_t attr;
int ret;
int settingPriority = 1;
ret=pthread_attr_init(&attr);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
ret=pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
if (system("grep -iq 'ID_LIKE.*fedora' /etc/os-release && uname -a | grep -c rt")==0)
if (system("cat /proc/self/cgroup | egrep -c 'libpod|podman|kubepods'")==0)
settingPriority = 0;
if (settingPriority) {
ret=pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
ret=pthread_attr_setschedpolicy(&attr, SCHED_OAI);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
if(priority<sched_get_priority_min(SCHED_OAI) || priority>sched_get_priority_max(SCHED_OAI)) {
LOG_E(UTIL,"Prio not possible: %d, min is %d, max: %d, forced in the range\n",
priority,
sched_get_priority_min(SCHED_OAI),
sched_get_priority_max(SCHED_OAI));
if(priority<sched_get_priority_min(SCHED_OAI))
priority=sched_get_priority_min(SCHED_OAI);
if(priority>sched_get_priority_max(SCHED_OAI))
priority=sched_get_priority_max(SCHED_OAI);
}
AssertFatal(priority<=sched_get_priority_max(SCHED_OAI),"");
struct sched_param sparam={0};
sparam.sched_priority = priority;
ret=pthread_attr_setschedparam(&attr, &sparam);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
}
ret=pthread_create(t, &attr, func, param);
AssertFatal(ret==0,"ret: %d, errno: %d\n",ret, errno);
pthread_setname_np(*t, name);
if (affinity != -1 ) {
abort();
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(affinity, &cpuset);
AssertFatal( pthread_setaffinity_np(*t, sizeof(cpu_set_t), &cpuset) == 0, "Error setting processor affinity");
}
pthread_attr_destroy(&attr);
}
// Block CPU C-states deep sleep
void configure_linux(void) {
int ret;
static int latency_target_fd=-1;
uint32_t latency_target_value=10; // in microseconds
if (latency_target_fd == -1) {
if ( (latency_target_fd = open("/dev/cpu_dma_latency", O_RDWR)) != -1 ) {
ret = write(latency_target_fd, &latency_target_value, sizeof(latency_target_value));
if (ret == 0) {
printf("# error setting cpu_dma_latency to %u!: %s\n", latency_target_value, strerror(errno));
close(latency_target_fd);
latency_target_fd=-1;
return;
}
}
}
if (latency_target_fd != -1)
LOG_I(HW,"# /dev/cpu_dma_latency set to %u us\n", latency_target_value);
else
LOG_E(HW,"Can't set /dev/cpu_dma_latency to %u us\n", latency_target_value);
// Set CPU frequency to it's maximum
if ( 0 != system("for d in /sys/devices/system/cpu/cpu[0-9]*; do cat $d/cpufreq/cpuinfo_max_freq > $d/cpufreq/scaling_min_freq; done"))
LOG_E(HW,"Can't set cpu frequency\n");
mlockall(MCL_CURRENT | MCL_FUTURE);
}