| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #ifndef _LTTNG_KCONSUMER_H |
| 20 | #define _LTTNG_KCONSUMER_H |
| 21 | |
| 22 | #include <common/consumer.h> |
| 23 | |
| 24 | /* |
| 25 | * Mmap the ring buffer, read it and write the data to the tracefile. |
| 26 | * |
| 27 | * Returns the number of bytes written, or negative value on error. |
| 28 | */ |
| 29 | extern ssize_t lttng_kconsumer_on_read_subbuffer_mmap( |
| 30 | struct lttng_consumer_local_data *ctx, |
| 31 | struct lttng_consumer_stream *stream, unsigned long len); |
| 32 | |
| 33 | /* |
| 34 | * Splice the data from the ring buffer to the tracefile. |
| 35 | * |
| 36 | * Returns the number of bytes spliced, or negative error value on |
| 37 | * error. |
| 38 | */ |
| 39 | extern ssize_t lttng_kconsumer_on_read_subbuffer_splice( |
| 40 | struct lttng_consumer_local_data *ctx, |
| 41 | struct lttng_consumer_stream *stream, unsigned long len); |
| 42 | |
| 43 | /* |
| 44 | * Take a snapshot for a specific fd |
| 45 | * |
| 46 | * Returns 0 on success, < 0 on error |
| 47 | */ |
| 48 | int lttng_kconsumer_take_snapshot(struct lttng_consumer_local_data *ctx, |
| 49 | struct lttng_consumer_stream *stream); |
| 50 | |
| 51 | /* |
| 52 | * Get the produced position |
| 53 | * |
| 54 | * Returns 0 on success, < 0 on error |
| 55 | */ |
| 56 | int lttng_kconsumer_get_produced_snapshot( |
| 57 | struct lttng_consumer_local_data *ctx, |
| 58 | struct lttng_consumer_stream *stream, |
| 59 | unsigned long *pos); |
| 60 | |
| 61 | int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
| 62 | int sock, struct pollfd *consumer_sockpoll); |
| 63 | |
| 64 | |
| 65 | ssize_t lttng_kconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
| 66 | struct lttng_consumer_local_data *ctx); |
| 67 | int lttng_kconsumer_on_recv_stream(struct lttng_consumer_stream *stream); |
| 68 | |
| 69 | #endif /* _LTTNG_KCONSUMER_H */ |