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I want to use this in gio-launch-desktop, but gio-launch-desktop doesn't depend on GLib, so I can't just call g_log_writer_is_journald(). Signed-off-by: Simon McVittie <smcv@collabora.com>
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/*
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* Copyright 2016 Red Hat, Inc.
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* Copyright 2016-2022 Collabora Ltd.
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* Copyright 2017-2022 Endless OS Foundation, LLC
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* Copyright 2018 Will Thompson
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "gjournal-private.h"
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#if defined(__linux__) && !defined(__BIONIC__)
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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/*
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* Reimplementation of g_str_has_prefix(), necessary when compiled into
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* gio-launch-desktop.
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*/
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static int
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str_has_prefix (const char *str,
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const char *prefix)
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{
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return strncmp (str, prefix, strlen (prefix)) == 0;
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}
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/*
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* _g_fd_is_journal:
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* @output_fd: output file descriptor to check
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*
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* Same as g_log_writer_is_journald(), but with no GLib dependencies.
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*
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* Returns: 1 if @output_fd points to the journal, 0 otherwise
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*/
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int
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_g_fd_is_journal (int output_fd)
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{
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/* FIXME: Use the new journal API for detecting whether we’re writing to the
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* journal. See: https://github.com/systemd/systemd/issues/2473
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*/
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union {
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struct sockaddr_storage storage;
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struct sockaddr sa;
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struct sockaddr_un un;
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} addr;
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socklen_t addr_len;
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int err;
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if (output_fd < 0)
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return 0;
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/* Namespaced journals start with `/run/systemd/journal.${name}/` (see
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* `RuntimeDirectory=systemd/journal.%i` in `systemd-journald@.service`. The
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* default journal starts with `/run/systemd/journal/`. */
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memset (&addr, 0, sizeof (addr));
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addr_len = sizeof(addr);
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err = getpeername (output_fd, &addr.sa, &addr_len);
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if (err == 0 && addr.storage.ss_family == AF_UNIX)
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return (str_has_prefix (addr.un.sun_path, "/run/systemd/journal/") ||
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str_has_prefix (addr.un.sun_path, "/run/systemd/journal."));
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return 0;
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}
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#endif
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