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passt/log.h

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passt: Relicense to GPL 2.0, or any later version In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-04-05 18:11:44 +00:00
/* SPDX-License-Identifier: GPL-2.0-or-later
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
* Copyright (c) 2022 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef LOG_H
#define LOG_H
log: Don't define logging function 4 times In log.c we use a macro to define logging functions for each of 4 priority levels. The only difference between these is the priority we pass to vsyslog() and similar functions. Because it's done as a macro, however, the entire functions code is included in the binary 4 times. Rearrange this to take the priority level as a parameter to a regular function, then just use macros to define trivial wrappers which pass the priority level. This saves about 600 bytes of text in the executable (x86, non-AVX2). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-10-13 04:50:28 +00:00
#include <syslog.h>
log, conf: Add support for logging to file In some environments, such as KubeVirt pods, we might not have a system logger available. We could choose to run in foreground, but this takes away the convenient synchronisation mechanism derived from forking to background when interfaces are ready. Add optional logging to file with -l/--log-file and --log-size. Unfortunately, this means we need to duplicate features that are more appropriately implemented by a system logger, such as rotation. Keep that reasonably simple, by using fallocate() with range collapsing where supported (Linux kernel >= 3.15, extent-based ext4 and XFS) and falling back to an unsophisticated block-by-block moving of entries toward the beginning of the file once we reach the (mandatory) size limit. While at it, clarify the role of LOG_EMERG in passt.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-10-06 12:51:04 +00:00
#define LOGFILE_SIZE_DEFAULT (1024 * 1024UL)
#define LOGFILE_CUT_RATIO 30 /* When full, cut ~30% size */
#define LOGFILE_SIZE_MIN (5UL * MAX(BUFSIZ, PAGE_SIZE))
log: Add vlogmsg() Currently logmsg() is only available as a variadic function. This is fine for normal use, but is awkward if we ever want to write wrappers around it which (for example) add standardised prefix information. To allow that, add a vlogmsg() function which takes a va_list instead, and implement logmsg() in terms of it. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-10-13 04:50:30 +00:00
void vlogmsg(int pri, const char *format, va_list ap);
log: Enable format warnings logmsg() takes printf like arguments, but because it's not a built in, the compiler won't generate warnings if the format string and parameters don't match. Enable those by using the format attribute. Strictly speaking this is a gcc extension, but I believe it is also supported by some other common compilers. We already use some other attributes in various places. For now, just use it and we can worry about compilers that don't support it if it comes up. This exposes some warnings from existing callers, both in gcc and in clang-tidy: - Some are straight out bugs, which we correct - It's occasionally useful to invoke the logging functions with an empty string, which gcc objects to, so disable that specific warning in the Makefile - Strictly speaking the C standard requires that the parameter for a %p be a (void *), not some other pointer type. That's only likely to cause problems in practice on weird architectures with different sized representations for pointers to different types. Nonetheless add the casts to make it happy. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-10-13 04:50:29 +00:00
void logmsg(int pri, const char *format, ...)
__attribute__((format(printf, 2, 3)));
log: Don't define logging function 4 times In log.c we use a macro to define logging functions for each of 4 priority levels. The only difference between these is the priority we pass to vsyslog() and similar functions. Because it's done as a macro, however, the entire functions code is included in the binary 4 times. Rearrange this to take the priority level as a parameter to a regular function, then just use macros to define trivial wrappers which pass the priority level. This saves about 600 bytes of text in the executable (x86, non-AVX2). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2023-10-13 04:50:28 +00:00
#define err(...) logmsg(LOG_ERR, __VA_ARGS__)
#define warn(...) logmsg(LOG_WARNING, __VA_ARGS__)
#define info(...) logmsg(LOG_INFO, __VA_ARGS__)
#define debug(...) logmsg(LOG_DEBUG, __VA_ARGS__)
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
log, conf, tap: Define die() as err() plus exit(), drop cppcheck workarounds If we define die() as a variadic macro, passing __VA_ARGS__ to err(), and calling exit() outside err() itself, we can drop the workarounds introduced in commit 36f0199f6ef4 ("conf, tap: Silence two false positive invalidFunctionArg from cppcheck"). Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2023-02-27 03:06:19 +00:00
#define die(...) \
do { \
err(__VA_ARGS__); \
exit(EXIT_FAILURE); \
} while (0)
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
extern int log_trace;
void trace_init(int enable);
log.h: Avoid unnecessary GNU extension for token pasting clang says: ./log.h:23:18: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments] We need token pasting here just because of the 'format' in trace(): drop it. Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-10-12 15:31:37 +00:00
#define trace(...) \
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
do { \
if (log_trace) \
log.h: Avoid unnecessary GNU extension for token pasting clang says: ./log.h:23:18: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments] We need token pasting here just because of the 'format' in trace(): drop it. Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2022-10-12 15:31:37 +00:00
debug(__VA_ARGS__); \
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
} while (0)
void __openlog(const char *ident, int option, int facility);
log, conf: Add support for logging to file In some environments, such as KubeVirt pods, we might not have a system logger available. We could choose to run in foreground, but this takes away the convenient synchronisation mechanism derived from forking to background when interfaces are ready. Add optional logging to file with -l/--log-file and --log-size. Unfortunately, this means we need to duplicate features that are more appropriately implemented by a system logger, such as rotation. Keep that reasonably simple, by using fallocate() with range collapsing where supported (Linux kernel >= 3.15, extent-based ext4 and XFS) and falling back to an unsophisticated block-by-block moving of entries toward the beginning of the file once we reach the (mandatory) size limit. While at it, clarify the role of LOG_EMERG in passt.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-10-06 12:51:04 +00:00
void logfile_init(const char *name, const char *path, size_t size);
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
void passt_vsyslog(int pri, const char *format, va_list ap);
log, conf: Add support for logging to file In some environments, such as KubeVirt pods, we might not have a system logger available. We could choose to run in foreground, but this takes away the convenient synchronisation mechanism derived from forking to background when interfaces are ready. Add optional logging to file with -l/--log-file and --log-size. Unfortunately, this means we need to duplicate features that are more appropriately implemented by a system logger, such as rotation. Keep that reasonably simple, by using fallocate() with range collapsing where supported (Linux kernel >= 3.15, extent-based ext4 and XFS) and falling back to an unsophisticated block-by-block moving of entries toward the beginning of the file once we reach the (mandatory) size limit. While at it, clarify the role of LOG_EMERG in passt.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-10-06 12:51:04 +00:00
void logfile_write(int pri, const char *format, va_list ap);
Move logging functions to a new file, log.c Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-09-24 07:53:15 +00:00
void __setlogmask(int mask);
#endif /* LOG_H */
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