98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/*
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* Copyright (c) 2021 Barcelona Supercomputing Center (BSC)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#define _POSIX_C_SOURCE 200112L
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#define _GNU_SOURCE
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#include <stdint.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <linux/limits.h>
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#include <limits.h>
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#include "ovni.h"
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// Define gettid for older glibc versions (below 2.30)
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#if !__GLIBC_PREREQ(2, 30)
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static inline pid_t gettid(void)
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{
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return (pid_t)syscall(SYS_gettid);
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}
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#endif
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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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{
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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 emit(uint8_t *buf, size_t size)
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{
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struct ovni_ev ev = {0};
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ovni_clock_update();
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ovni_ev_set_mcv(&ev, "O$$");
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ovni_ev_jumbo_emit(&ev, buf, size);
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}
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int main(void)
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{
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size_t payload_size;
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uint8_t *payload_buf;
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init();
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payload_size = (size_t) (0.9 * (double) OVNI_MAX_EV_BUF);
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payload_buf = calloc(1, payload_size);
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if(!payload_buf)
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{
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perror("calloc failed");
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exit(EXIT_FAILURE);
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}
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/* The first should fit, filling 90 % of the buffer */
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emit(payload_buf, payload_size);
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/* The second event would cause a flush */
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emit(payload_buf, payload_size);
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/* The third would cause the previous flush events to be written
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* to disk */
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emit(payload_buf, payload_size);
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/* Flush the last event to disk manually */
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ovni_flush();
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ovni_proc_fini();
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free(payload_buf);
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return 0;
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}
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