| 1 | /* |
| 2 | * default_pipe_size_getter.c |
| 3 | * |
| 4 | * Tests suite for LTTng notification API (get default size of pipes) |
| 5 | * |
| 6 | * Copyright (C) 2021 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 7 | * |
| 8 | * SPDX-License-Identifier: MIT |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #ifndef _GNU_SOURCE |
| 13 | #define _GNU_SOURCE |
| 14 | #endif |
| 15 | |
| 16 | #include <common/error.hpp> |
| 17 | #include <common/pipe.hpp> |
| 18 | |
| 19 | #include <fcntl.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | int lttng_opt_verbose; |
| 25 | int lttng_opt_mi; |
| 26 | int lttng_opt_quiet; |
| 27 | |
| 28 | namespace { |
| 29 | #ifdef __linux__ |
| 30 | /* |
| 31 | * Return the default pipe buffer size or a negative error. |
| 32 | */ |
| 33 | int get_pipe_size() |
| 34 | { |
| 35 | int ret; |
| 36 | /* |
| 37 | * The event notifier pipes are not "special"; they are created using |
| 38 | * the lttng_pipe utility. Hence, this should be representative of a |
| 39 | * pipe created by the session daemon for event notifier messages to |
| 40 | * go through. |
| 41 | */ |
| 42 | struct lttng_pipe *pipe = lttng_pipe_open(0); |
| 43 | |
| 44 | if (!pipe) { |
| 45 | /* lttng_pipe_open already logs on error. */ |
| 46 | ret = -1; |
| 47 | goto end; |
| 48 | } |
| 49 | |
| 50 | ret = fcntl(lttng_pipe_get_writefd(pipe), F_GETPIPE_SZ); |
| 51 | if (ret < 0) { |
| 52 | PERROR("Failed to get the size of the pipe"); |
| 53 | } |
| 54 | |
| 55 | lttng_pipe_destroy(pipe); |
| 56 | end: |
| 57 | return ret; |
| 58 | } |
| 59 | #elif defined(__FreeBSD__) |
| 60 | int get_pipe_size(void) |
| 61 | { |
| 62 | return 65536; |
| 63 | } |
| 64 | #else |
| 65 | #error "Implement get_pipe_size() for your platform." |
| 66 | #endif |
| 67 | } /* namespace */ |
| 68 | |
| 69 | int main() |
| 70 | { |
| 71 | int ret; |
| 72 | |
| 73 | ret = get_pipe_size(); |
| 74 | if (ret < 0) { |
| 75 | return EXIT_FAILURE; |
| 76 | } |
| 77 | |
| 78 | /* Print the pipe buffer size to stdout. */ |
| 79 | printf("%d\n", ret); |
| 80 | |
| 81 | return EXIT_SUCCESS; |
| 82 | } |