Logging to Linux Syslog

syslog.c

#include <pthread.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/syslog.h>

#define THREAD_COUNT 128
static const char *g_log_header = "[MYLOGS]";

typedef struct {
  int threadIdx;
} threadParams_t;

// POSIX thread declarations and scheduling attributes
//
static pthread_t threads[THREAD_COUNT];
static threadParams_t threadParams[THREAD_COUNT];

// Thread
//
void *incThread(void *threadp) {
  int i;
  threadParams_t *threadParams = (threadParams_t *)threadp;

  int gsum = 0;
  for (i = 1; i <= threadParams->threadIdx; i++) {
    gsum = gsum + i;
  }

  syslog(LOG_INFO, "Thread idx=%d, sum[1...%d]=%d\n", threadParams->threadIdx,
         threadParams->threadIdx, gsum);
}

int clear_syslog() {
  if (system("truncate -s 0 /var/log/syslog"))
    return -1;
  return 0;
}

int main(int argc, char *argv[]) {
  if (clear_syslog()) {
    printf("Warning: Failed to clear log!");
  }

  openlog(g_log_header, LOG_NDELAY, LOG_DAEMON);

  char result[1024] = {0x0};
  sprintf(result, R"(logger "%s: `uname -a`")", g_log_header);
  if (system(result)) {
    printf("Error to print hardware information to the syslog.\n");
  }

  for (int i = 0; i < THREAD_COUNT; i++) {
    threadParams[i].threadIdx = i;
    pthread_create(&threads[i],               // pointer to thread descriptor
                   (void *)0,                 // use default attributes
                   incThread,                 // thread function entry point
                   (void *)&(threadParams[i]) // parameters to pass in
    );
  }

  for (int i = 0; i < THREAD_COUNT; i++)
    pthread_join(threads[i], NULL);

  printf("TEST COMPLETE\n");
  closelog();
}