zabbix_log_cutout.c

ファイルコンテンツ

#include <stdio.h>

void usage(char *prog)
{
  fprintf(stdout, "Usage: %s logfile PID\n", prog);
  fprintf(stdout, "\t%s creates logfile-%%06d.log file. %%06d is given PID.\n", prog);
  return;
}

int main(int argc, char *argv[])
{
  FILE *fp, *fp_out;
  int process;
  char buf[4096];
  int flag = 0;
  int p, p_o = 0;
  char out_file[128];

  if (argc < 3) {
    fprintf(stderr, "is not given file name or PID\n");
    usage(argv[0]);
    return 1;
  }

  process = atoi(argv[2]);
  if (process > 999999 || process < 1) {
    fprintf(stderr, "PID is incorrect.\n");
    return 3;
  }

  if (snprintf(out_file, sizeof(out_file), "%s-%06d.log", argv[1], process) >= sizeof(out_file)) {
    fprintf(stderr, "can not generate output file name.\n%s may be too long.\n", argv[1]);
    return 4;
  }

  if ((fp = fopen(argv[1], "r")) == NULL) {
    fprintf(stderr, "can not open %s\n", argv[1]);
    return 2;
  }

  fp_out = fopen(out_file, "w");
  while (fgets(buf, 4096, fp) != NULL) {
    if (sscanf(buf, "%6d:", &p) == 1) {
      // fprintf(stdout, "read process id = %d\n", p);
      if (p != process) {
        p_o = 0;
        continue;
      }
      p_o = p;
      fputs(buf, fp_out);
    } else if (p_o == process) {
      fputs(buf, fp_out);
    }
  }

  fclose(fp);
  fclose(fp_out);
  
  return 0;
}