81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
/* Copyright (c) 2021-2022 Barcelona Supercomputing Center (BSC)
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* SPDX-License-Identifier: GPL-3.0-or-later */
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#define _POSIX_C_SOURCE 200112L
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#define _GNU_SOURCE
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#include <limits.h>
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#include <linux/limits.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "compat.h"
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#include "common.h"
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#include "ovni.h"
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static inline void
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init(void)
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{
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char hostname[HOST_NAME_MAX];
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if (gethostname(hostname, HOST_NAME_MAX) != 0) {
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perror("gethostname failed");
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exit(EXIT_FAILURE);
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}
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ovni_proc_init(0, hostname, getpid());
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ovni_thread_init(gettid());
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ovni_add_cpu(0, 0);
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}
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static void
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emit(char *mcv, int64_t clock)
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{
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struct ovni_ev ev = {0};
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ovni_ev_set_mcv(&ev, mcv);
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ovni_ev_set_clock(&ev, clock);
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ovni_ev_emit(&ev);
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}
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int
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main(void)
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{
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init();
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int64_t t0 = ovni_clock_now();
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/* Leave some room to prevent clashes */
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usleep(100000); /* 100000000 ns */
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int64_t t1 = ovni_clock_now();
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emit("OU[", t1);
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/* Fill the ring buffer */
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long n = 1000000 + 10;
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err("using n=%ld events\n", n);
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/* Go back 100 ns for each event (with some space) */
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int64_t delta = 10000;
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int64_t t = t0 + delta;
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for (long i = 0; i < n; i++) {
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if (t <= t0 || t >= t1)
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die("bad time\n");
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emit("OB.", t);
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t += 33;
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}
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emit("OU]", ovni_clock_now());
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ovni_flush();
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ovni_proc_fini();
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return 0;
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}
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