1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2011 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <sys/socket.h>
27 #include "sd-journal.h"
29 #include "socket-util.h"
31 /* We open a single fd, and we'll share it with the current process,
32 * all its threads, and all its subprocesses. This means we need to
33 * initialize it atomically, and need to operate on it atomically
34 * never assuming we are the only user */
36 static int journal_fd(void) {
38 static int fd_plus_one = 0;
42 return fd_plus_one - 1;
44 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
48 if (!__sync_bool_compare_and_swap(&fd_plus_one, 0, fd+1)) {
49 close_nointr_nofail(fd);
56 int sd_journal_print(int priority, const char *format, ...) {
61 r = sd_journal_printv(priority, format, ap);
67 int sd_journal_printv(int priority, const char *format, va_list ap) {
68 char buffer[8 + LINE_MAX], p[11];
71 if (priority < 0 || priority > 7)
77 snprintf(p, sizeof(p), "PRIORITY=%i", priority & LOG_PRIMASK);
80 memcpy(buffer, "MESSAGE=", 8);
81 vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
85 IOVEC_SET_STRING(iov[0], buffer);
86 IOVEC_SET_STRING(iov[1], p);
88 return sd_journal_sendv(iov, 2);
91 int sd_journal_send(const char *format, ...) {
92 int r, n = 0, i = 0, j;
94 struct iovec *iov = NULL;
103 c = realloc(iov, n * sizeof(struct iovec));
112 if (vasprintf(&buffer, format, ap) < 0) {
117 IOVEC_SET_STRING(iov[i++], buffer);
119 format = va_arg(ap, char *);
123 r = sd_journal_sendv(iov, i);
126 for (j = 0; j < i; j++)
127 free(iov[j].iov_base);
134 int sd_journal_sendv(const struct iovec *iov, int n) {
140 struct sockaddr_un sa;
145 w = alloca(sizeof(struct iovec) * n * 5);
146 l = alloca(sizeof(uint64_t) * n);
148 for (i = 0; i < n; i++) {
151 c = memchr(iov[i].iov_base, '=', iov[i].iov_len);
155 nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len);
160 /* Already includes a newline? Bummer, then
161 * let's write the variable name, then a
162 * newline, then the size (64bit LE), followed
163 * by the data and a final newline */
165 w[j].iov_base = iov[i].iov_base;
166 w[j].iov_len = c - (char*) iov[i].iov_base;
169 IOVEC_SET_STRING(w[j++], "\n");
171 l[i] = htole64(iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1);
172 w[j].iov_base = &l[i];
173 w[j].iov_len = sizeof(uint64_t);
176 w[j].iov_base = c + 1;
177 w[j].iov_len = iov[i].iov_len - (c - (char*) iov[i].iov_base) - 1;
181 /* Nothing special? Then just add the line and
182 * append a newline */
185 IOVEC_SET_STRING(w[j++], "\n");
193 sa.sun_family = AF_UNIX;
194 strncpy(sa.sun_path,"/run/systemd/journal", sizeof(sa.sun_path));
198 mh.msg_namelen = offsetof(struct sockaddr_un, sun_path) + strlen(sa.sun_path);
202 if (sendmsg(fd, &mh, MSG_NOSIGNAL) < 0)
208 int sd_journal_stream_fd(const char *tag, int priority, int priority_prefix) {
209 union sockaddr_union sa;
215 if (priority < 0 || priority > 7)
218 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
223 sa.un.sun_family = AF_UNIX;
224 strncpy(sa.un.sun_path, "/run/systemd/stdout", sizeof(sa.un.sun_path));
226 r = connect(fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
228 close_nointr_nofail(fd);
236 header = alloca(l + 1 + 2 + 2 + 2);
238 memcpy(header, tag, l);
240 header[l++] = '0' + priority;
242 header[l++] = '0' + !!priority_prefix;
247 r = loop_write(fd, header, l, false);
249 close_nointr_nofail(fd);
253 if ((size_t) r != l) {
254 close_nointr_nofail(fd);