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journal: implicitly add code location to all messages logged with the native interface

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This logic can be turned off by defining SD_JOURNAL_SUPPRESS_LOCATION
before including sd-journal.h.

This also saves/restores errno in all logging functions, in order to be
useful as logging calls without side-effects.

This also adds a couple of __unlikely__ around the early checks in the
logging calls, in order to minimize the runtime impact.
This commit is contained in:
Lennart Poettering 2012-04-02 19:24:30 +02:00
parent 1fa80181ae
commit b070e7f3c9
8 changed files with 283 additions and 32 deletions
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1
.gitignore vendored
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@ -1,3 +1,4 @@
/test-journal-send
/systemd-multi-seat-x
/systemd-cgtop
/systemd-coredump

10
Makefile.am
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@ -1247,6 +1247,13 @@ test_journal_LDADD += \
$(XZ_LIBS)
endif
test_journal_send_SOURCES = \
src/journal/test-journal-send.c
test_journal_send_LDADD = \
libsystemd-basic.la \
libsystemd-journal.la
libsystemd_journal_la_SOURCES = \
src/journal/sd-journal.c \
src/journal/journal-file.c \
@ -1297,7 +1304,8 @@ UNINSTALL_EXEC_HOOKS += \
libsystemd-journal-uninstall-hook
noinst_PROGRAMS += \
test-journal
test-journal \
test-journal-send
pkginclude_HEADERS += \
src/systemd/sd-journal.h \

2
TODO
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@ -19,6 +19,8 @@ Bugfixes:
Features:
* cleanup syslog 'priority' vs. 'level' wording
* journal: if mmap() fails for mapping window try to unmap a a few older maps
* add flag file for shutdownd so that clients can check whether a shutdown is queued
* new env var for /var/tmp? glib?

238
src/journal/journal-send.c
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@ -26,6 +26,8 @@
#include <unistd.h>
#include <fcntl.h>
#define SD_JOURNAL_SUPPRESS_LOCATION
#include "sd-journal.h"
#include "util.h"
#include "socket-util.h"
@ -94,12 +96,26 @@ _public_ int sd_journal_printv(int priority, const char *format, va_list ap) {
return sd_journal_sendv(iov, 2);
}
_public_ int sd_journal_send(const char *format, ...) {
int r, n = 0, i = 0, j;
va_list ap;
static int fill_iovec_sprintf(const char *format, va_list ap, int extra, struct iovec **_iov) {
int r, n = 0, i, j;
struct iovec *iov = NULL;
int saved_errno;
assert(_iov);
saved_errno = errno;
if (extra > 0) {
n = MAX(extra * 2, extra + 4);
iov = malloc0(n * sizeof(struct iovec));
if (!iov) {
r = -ENOMEM;
goto fail;
}
i = extra;
} else
i = 0;
va_start(ap, format);
while (format) {
struct iovec *c;
char *buffer;
@ -124,11 +140,39 @@ _public_ int sd_journal_send(const char *format, ...) {
format = va_arg(ap, char *);
}
*_iov = iov;
errno = saved_errno;
return i;
fail:
for (j = 0; j < i; j++)
free(iov[j].iov_base);
free(iov);
errno = saved_errno;
return r;
}
_public_ int sd_journal_send(const char *format, ...) {
int r, i, j;
va_list ap;
struct iovec *iov = NULL;
va_start(ap, format);
i = fill_iovec_sprintf(format, ap, 0, &iov);
va_end(ap);
if (_unlikely_(i < 0)) {
r = i;
goto finish;
}
r = sd_journal_sendv(iov, i);
fail:
finish:
for (j = 0; j < i; j++)
free(iov[j].iov_base);
@ -141,10 +185,11 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
int fd, buffer_fd;
struct iovec *w;
uint64_t *l;
int i, j = 0;
int r, i, j = 0;
struct msghdr mh;
struct sockaddr_un sa;
ssize_t k;
int saved_errno;
union {
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(int))];
@ -155,27 +200,37 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
* and where unprivileged users can create files. */
char path[] = "/dev/shm/journal.XXXXXX";
if (!iov || n <= 0)
if (_unlikely_(!iov))
return -EINVAL;
if (_unlikely_(n <= 0))
return -EINVAL;
saved_errno = errno;
w = alloca(sizeof(struct iovec) * n * 5);
l = alloca(sizeof(uint64_t) * n);
for (i = 0; i < n; i++) {
char *c, *nl;
if (!iov[i].iov_base ||
iov[i].iov_len <= 1)
return -EINVAL;
if (_unlikely_(!iov[i].iov_base || iov[i].iov_len <= 1)) {
r = -EINVAL;
goto finish;
}
c = memchr(iov[i].iov_base, '=', iov[i].iov_len);
if (!c || c == iov[i].iov_base)
return -EINVAL;
if (_unlikely_(!c || c == iov[i].iov_base)) {
r = -EINVAL;
goto finish;
}
nl = memchr(iov[i].iov_base, '\n', iov[i].iov_len);
if (nl) {
if (nl < c)
return -EINVAL;
if (_unlikely_(nl < c)) {
r = -EINVAL;
goto finish;
}
/* Already includes a newline? Bummer, then
* let's write the variable name, then a
@ -206,8 +261,10 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
}
fd = journal_fd();
if (fd < 0)
return fd;
if (_unlikely_(fd < 0)) {
r = fd;
goto finish;
}
zero(sa);
sa.sun_family = AF_UNIX;
@ -220,29 +277,37 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
mh.msg_iovlen = j;
k = sendmsg(fd, &mh, MSG_NOSIGNAL);
if (k >= 0)
return 0;
if (k >= 0) {
r = 0;
goto finish;
}
if (errno != EMSGSIZE && errno != ENOBUFS)
return -errno;
if (errno != EMSGSIZE && errno != ENOBUFS) {
r = -errno;
goto finish;
}
/* Message doesn't fit... Let's dump the data in a temporary
* file and just pass a file descriptor of it to the other
* side */
buffer_fd = mkostemp(path, O_CLOEXEC|O_RDWR);
if (buffer_fd < 0)
return -errno;
if (buffer_fd < 0) {
r = -errno;
goto finish;
}
if (unlink(path) < 0) {
close_nointr_nofail(buffer_fd);
return -errno;
r = -errno;
goto finish;
}
n = writev(buffer_fd, w, j);
if (n < 0) {
if (n < 0) {
close_nointr_nofail(buffer_fd);
return -errno;
r = -errno;
goto finish;
}
mh.msg_iov = NULL;
@ -263,10 +328,17 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
k = sendmsg(fd, &mh, MSG_NOSIGNAL);
close_nointr_nofail(buffer_fd);
if (k < 0)
return -errno;
if (k < 0) {
r = -errno;
goto finish;
}
return 0;
r = 0;
finish:
errno = saved_errno;
return r;
}
_public_ int sd_journal_stream_fd(const char *identifier, int priority, int level_prefix) {
@ -332,3 +404,113 @@ _public_ int sd_journal_stream_fd(const char *identifier, int priority, int leve
return fd;
}
_public_ int sd_journal_print_with_location(int priority, const char *file, const char *line, const char *func, const char *format, ...) {
int r;
va_list ap;
va_start(ap, format);
r = sd_journal_printv_with_location(priority, file, line, func, format, ap);
va_end(ap);
return r;
}
_public_ int sd_journal_printv_with_location(int priority, const char *file, const char *line, const char *func, const char *format, va_list ap) {
char buffer[8 + LINE_MAX], p[11];
struct iovec iov[5];
char *f;
size_t fl;
if (priority < 0 || priority > 7)
return -EINVAL;
if (_unlikely_(!format))
return -EINVAL;
snprintf(p, sizeof(p), "PRIORITY=%i", priority & LOG_PRIMASK);
char_array_0(p);
memcpy(buffer, "MESSAGE=", 8);
vsnprintf(buffer+8, sizeof(buffer) - 8, format, ap);
char_array_0(buffer);
/* func is initialized from __func__ which is not a macro, but
* a static const char[], hence cannot easily be prefixed with
* CODE_FUNC=, hence let's do it manually here. */
fl = strlen(func);
f = alloca(fl + 10);
memcpy(f, "CODE_FUNC=", 10);
memcpy(f + 10, func, fl + 1);
zero(iov);
IOVEC_SET_STRING(iov[0], buffer);
IOVEC_SET_STRING(iov[1], p);
IOVEC_SET_STRING(iov[2], file);
IOVEC_SET_STRING(iov[3], line);
IOVEC_SET_STRING(iov[4], f);
return sd_journal_sendv(iov, ELEMENTSOF(iov));
}
_public_ int sd_journal_send_with_location(const char *file, const char *line, const char *func, const char *format, ...) {
int r, i, j;
va_list ap;
struct iovec *iov = NULL;
char *f;
size_t fl;
va_start(ap, format);
i = fill_iovec_sprintf(format, ap, 3, &iov);
va_end(ap);
if (_unlikely_(i < 0)) {
r = i;
goto finish;
}
fl = strlen(func);
f = alloca(fl + 10);
memcpy(f, "CODE_FUNC=", 10);
memcpy(f + 10, func, fl + 1);
IOVEC_SET_STRING(iov[0], file);
IOVEC_SET_STRING(iov[1], line);
IOVEC_SET_STRING(iov[2], f);
r = sd_journal_sendv(iov, i);
finish:
for (j = 3; j < i; j++)
free(iov[j].iov_base);
free(iov);
return r;
}
_public_ int sd_journal_sendv_with_location(const char *file, const char *line, const char *func, const struct iovec *iov, int n) {
struct iovec *niov;
char *f;
size_t fl;
if (_unlikely_(!iov))
return -EINVAL;
if (_unlikely_(n <= 0))
return -EINVAL;
niov = alloca(sizeof(struct iovec) * (n + 3));
memcpy(niov, iov, sizeof(struct iovec) * n);
fl = strlen(func);
f = alloca(fl + 10);
memcpy(f, "CODE_FUNC=", 10);
memcpy(f + 10, func, fl + 1);
IOVEC_SET_STRING(niov[n++], file);
IOVEC_SET_STRING(niov[n++], line);
IOVEC_SET_STRING(niov[n++], f);
return sd_journal_sendv(niov, n);
}

8
src/journal/libsystemd-journal.sym
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@ -43,3 +43,11 @@ global:
local:
*;
};
LIBSYSTEMD_JOURNAL_45 {
global:
sd_journal_print_with_location;
sd_journal_printv_with_location;
sd_journal_send_with_location;
sd_journal_sendv_with_location;
} LIBSYSTEMD_JOURNAL_38;

32
src/journal/test-journal-send.c Normal file
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@ -0,0 +1,32 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <systemd/sd-journal.h>
int main(int argc, char *argv[]) {
sd_journal_print(LOG_INFO, "piepapo");
sd_journal_send("MESSAGE=foobar",
"VALUE=%i", 7,
NULL);
return 0;
}

2
src/log.h
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@ -93,7 +93,7 @@ int log_dump_internal(
const char *func,
char *buffer);
#define log_full(level, ...) log_meta(level, __FILE__, __LINE__, __func__, __VA_ARGS__)
#define log_full(level, ...) log_meta(level, __FILE__, __LINE__, __func__, __VA_ARGS__)
#define log_debug(...) log_meta(LOG_DEBUG, __FILE__, __LINE__, __func__, __VA_ARGS__)
#define log_info(...) log_meta(LOG_INFO, __FILE__, __LINE__, __func__, __VA_ARGS__)

22
src/systemd/sd-journal.h
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@ -26,6 +26,7 @@
#include <sys/types.h>
#include <stdarg.h>
#include <sys/uio.h>
#include <syslog.h>
#include <systemd/sd-id128.h>
@ -34,13 +35,30 @@ extern "C" {
#endif
/* Write to daemon */
int sd_journal_print(int piority, const char *format, ...) __attribute__ ((format (printf, 2, 3)));
int sd_journal_printv(int priority, const char *format, va_list ap);
int sd_journal_send(const char *format, ...) __attribute__((sentinel));
int sd_journal_sendv(const struct iovec *iov, int n);
/* Used by the macros below */
int sd_journal_print_with_location(int priority, const char *file, const char *line, const char *func, const char *format, ...) __attribute__ ((format (printf, 5, 6)));
int sd_journal_printv_with_location(int priority, const char *file, const char *line, const char *func, const char *format, va_list ap);
int sd_journal_send_with_location(const char *file, const char *line, const char *func, const char *format, ...) __attribute__((sentinel));
int sd_journal_sendv_with_location(const char *file, const char *line, const char *func, const struct iovec *iov, int n);
/* implicitly add code location to messages sent, if this is enabled */
#ifndef SD_JOURNAL_SUPPRESS_LOCATION
#define _sd_XSTRINGIFY(x) #x
#define _sd_STRINGIFY(x) _sd_XSTRINGIFY(x)
#define sd_journal_print(priority, ...) sd_journal_print_with_location(priority, "CODE_FILE=" __FILE__, "CODE_LINE=" _sd_STRINGIFY(__LINE__), __func__, __VA_ARGS__)
#define sd_journal_printv(priority, format, ap) sd_journal_printv_with_location(priority, "CODE_FILE=" __FILE__, "CODE_LINE=" _sd_STRINGIFY(__LINE__), __func__, format, ap)
#define sd_journal_send(...) sd_journal_send_with_location("CODE_FILE=" __FILE__, "CODE_LINE=" _sd_STRINGIFY(__LINE__), __func__, __VA_ARGS__)
#define sd_journal_sendv(iovec, n) sd_journal_sendv_with_location("CODE_FILE=" __FILE__, "CODE_LINE=" _sd_STRINGIFY(__LINE__), __func__, iovec, n)
#endif
int sd_journal_stream_fd(const char *identifier, int priority, int level_prefix);
/* Browse journal stream */