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// SPDX-License-Identifier: MIT
#define _GNU_SOURCE
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netdb.h>
#include <unistd.h>
#include "jitterdebugger.h"
static void read_online_cpus(struct jd_samples_info *info)
{
FILE *fd;
int n;
fd = jd_fopen(info->dir, "cpus_online", "r");
if (!fd)
err_handler(errno, "Could not read %s/cpus_online\n", info->dir);
n = fscanf(fd, "%d\n", &info->cpus_online);
if (n == EOF) {
if (ferror(fd)) {
err_handler(errno, "fscanf()");
perror("fscanf");
} else {
fprintf(stderr, "cpus_online: No matching characters, no matching failure\n");
exit(1);
}
} else if (n != 1) {
fprintf(stderr, "fscan() read more then one element\n");
exit(1);
}
fclose(fd);
if (info->cpus_online < 1) {
fprintf(stderr, "invalid input from cpus_online\n");
exit(1);
}
}
static void dump_samples(const char *port)
{
struct addrinfo hints, *res, *tmp;
struct latency_sample sp[SAMPLES_PER_PACKET];
ssize_t len;
size_t wlen;
int err, sk;
bzero(&hints, sizeof(struct addrinfo));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
err = getaddrinfo(NULL, port, &hints, &res);
if (err < 0)
err_handler(errno, "getaddrinfo()");
tmp = res;
do {
sk = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sk < 0)
continue;
err = bind(sk, res->ai_addr, res->ai_addrlen);
if (err == 0)
break;
close(sk);
res = res->ai_next;
} while(res);
freeaddrinfo(tmp);
while (1) {
len = recvfrom(sk, sp, sizeof(sp), 0, NULL, NULL);
if (len != sizeof(sp)) {
warn_handler("UDP packet has wrong size\n");
continue;
}
wlen = fwrite(sp, sizeof(sp), 1, stdout);
if (wlen != sizeof(sp))
err_handler(errno, "fwrite()");
}
close(sk);
}
struct jd_slist jd_samples_plugins = {
NULL,
};
int jd_samples_register(struct jd_samples_ops *ops)
{
jd_slist_append(&jd_samples_plugins, ops);
return 0;
}
void jd_samples_unregister(struct jd_samples_ops *ops)
{
jd_slist_remove(&jd_samples_plugins, ops);
}
static struct option long_options[] = {
{ "help", no_argument, 0, 'h' },
{ "version", no_argument, 0, 0 },
{ "format", required_argument, 0, 'f' },
{ "listen", required_argument, 0, 'l' },
{ 0, },
};
static void __attribute__((noreturn)) usage(int status)
{
printf("jittersamples [options] [DIR]\n");
printf(" DIR Directory generated by jitterdebugger --output\n");
printf("\n");
printf("Usage:\n");
printf(" -h, --help Print this help\n");
printf(" --version Print version of jittersamples\n");
printf(" -f, --format FMT Exporting samples in format [csv, hdf5]\n");
printf(" -l, --listen PORT Listen on PORT, dump samples to stdout\n");
exit(status);
}
int main(int argc, char *argv[])
{
FILE *input;
int c, long_idx;
char *format = "csv";
char *port = NULL;
struct jd_samples_info info;
struct jd_slist *list;
while (1) {
c = getopt_long(argc, argv, "hf:l:", long_options, &long_idx);
if (c < 0)
break;
switch (c) {
case 0:
if (!strcmp(long_options[long_idx].name, "version")) {
printf("jittersamples %s\n",
JD_VERSION);
exit(0);
}
break;
case 'h':
usage(0);
case 'f':
format = optarg;
break;
case 'l':
port = optarg;
break;
default:
printf("unknown option\n");
usage(1);
}
}
if (port) {
dump_samples(port);
exit(0);
}
if (optind == argc) {
fprintf(stderr, "Missing input DIR\n");
usage(1);
}
info.dir = argv[optind];
read_online_cpus(&info);
__jd_plugin_init();
input = jd_fopen(info.dir, "samples.raw", "r");
if (!input)
err_handler(errno, "Could not open '%s/samples.raw' for reading", info.dir);
for (list = jd_samples_plugins.next; list; list = list->next) {
struct jd_samples_ops *plugin = list->data;
if (strcmp(plugin->format, format))
continue;
plugin->output(&info, input);
break;
}
fclose(input);
__jd_plugin_cleanup();
if (!list) {
fprintf(stderr, "Unsupported file format \"%s\"\n", format);
exit(1);
}
return 0;
}
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