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/* Copyright 2018 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
#include <fcntl.h>
#include <stdio.h>
#include <sys/poll.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
volatile sig_atomic_t done = 0;
void term(int signum)
{
done = 1;
}
void strip(char *s) {
char *stripped_s = s;
while(*s != '\0') {
if(*s != ',' && *s != '\n') {
*stripped_s++ = *s++;
} else {
++s;
}
}
*stripped_s = '\0';
}
typedef struct {
int fd;
char *path;
} poll_source_t;
int write_trace_marker(char *marker, int size)
{
int ret;
FILE *file;
file = fopen("/sys/kernel/debug/tracing/trace_marker", "w");
if (file == NULL) {
return -errno;
}
ret = fwrite(marker, sizeof(char), size, file);
fclose(file);
return ret;
}
int main(int argc, char ** argv) {
extern char *optarg;
extern int optind;
int c = 0;
int show_help = 0;
useconds_t interval = 1000000;
char buf[1024];
memset(buf, 0, sizeof(buf));
struct timespec current_time;
double time_float;
char *labels;
int labelCount = 0;
int should_write_marker = 0;
int ret;
static char usage[] = "usage: %s [-h] [-m] [-t INTERVAL] FILE [FILE ...]\n"
"polls FILE(s) every INTERVAL microseconds and outputs\n"
"the results in CSV format including a timestamp to STDOUT\n"
"\n"
" -h Display this message\n"
" -m Insert a marker into ftrace at the time of the first\n"
" sample. This marker may be used to align the timestamps\n"
" produced by the poller with those of ftrace events.\n"
" -t The polling sample interval in microseconds\n"
" Defaults to 1000000 (1 second)\n"
" -l Comma separated list of labels to use in the CSV\n"
" output. This should match the number of files\n";
//Handling command line arguments
while ((c = getopt(argc, argv, "hmt:l:")) != -1)
{
switch(c) {
case 'h':
case '?':
default:
show_help = 1;
break;
case 'm':
should_write_marker = 1;
break;
case 't':
interval = (useconds_t)atoi(optarg);
break;
case 'l':
labels = optarg;
labelCount = 1;
int i;
for (i=0; labels[i]; i++)
labelCount += (labels[i] == ',');
}
}
if (show_help) {
fprintf(stderr, usage, argv[0]);
exit(1);
}
if (optind >= argc) {
fprintf(stderr, "ERROR: %s: missing file path(s)\n", argv[0]);
fprintf(stderr, usage, argv[0]);
exit(1);
}
int num_files = argc - optind;
poll_source_t files_to_poll[num_files];
if (labelCount && labelCount != num_files)
{
fprintf(stderr, "ERROR: %s: %d labels specified but %d files specified\n",
argv[0], labelCount, num_files);
fprintf(stderr, usage, argv[0]);
exit(1);
}
//Print headers and open files to poll
printf("time");
if(labelCount)
{
printf(",%s", labels);
}
int i;
for (i = 0; i < num_files; i++)
{
files_to_poll[i].path = argv[optind + i];
files_to_poll[i].fd = open(files_to_poll[i].path, O_RDONLY);
if (files_to_poll[i].fd == -1) {
fprintf(stderr, "ERROR: Could not open \"%s\", got: %s\n",
files_to_poll[i].path, strerror(errno));
exit(2);
}
if(!labelCount) {
printf(",%s", argv[optind + i]);
}
}
printf("\n");
//Setup SIGTERM handler
struct sigaction action;
memset(&action, 0, sizeof(struct sigaction));
action.sa_handler = term;
sigaction(SIGTERM, &action, NULL);
//Poll files
int bytes_read = 0;
while (!done) {
clock_gettime(CLOCK_BOOTTIME, ¤t_time);
if (should_write_marker) {
ret = write_trace_marker("POLLER_START", 12);
if (ret < 0) {
fprintf(stderr, "ERROR writing trace marker: %s\n", strerror(ret));
exit(ret);
}
}
time_float = (double)current_time.tv_sec;
time_float += ((double)current_time.tv_nsec)/1000/1000/1000;
printf("%f", time_float);
for (i = 0; i < num_files; i++) {
lseek(files_to_poll[i].fd, 0, SEEK_SET);
bytes_read = read(files_to_poll[i].fd, buf, 1024);
if (bytes_read < 0) {
fprintf(stderr, "WARNING: Read nothing from \"%s\"\n",
files_to_poll[i].path);
printf(",");
continue;
}
strip(buf);
printf(",%s", buf);
buf[0] = '\0'; // "Empty" buffer
}
printf("\n");
usleep(interval);
}
//Close files
for (i = 0; i < num_files; i++)
{
close(files_to_poll[i].fd);
}
exit(0);
}
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