Log to syslog only if option is specified. And if syslog is used
then normally only log to syslog, don't duplicate output.
Also enables syslog support on FreeBSD.
Signed-off-by: Stephen Hemminger <step...@networkplumber.org>
---
doc/guides/linux_gsg/linux_eal_parameters.rst | 27 -----
doc/guides/prog_guide/log_lib.rst | 17 +++
lib/eal/common/eal_common_options.c | 2 +-
lib/log/log.c | 101 ++++++++++++++++--
4 files changed, 111 insertions(+), 36 deletions(-)
diff --git a/doc/guides/linux_gsg/linux_eal_parameters.rst
b/doc/guides/linux_gsg/linux_eal_parameters.rst
index ea8f381391..d86f94d8a8 100644
--- a/doc/guides/linux_gsg/linux_eal_parameters.rst
+++ b/doc/guides/linux_gsg/linux_eal_parameters.rst
@@ -108,30 +108,3 @@ Memory-related options
* ``--match-allocations``
Free hugepages back to system exactly as they were originally allocated.
-
-Other options
-~~~~~~~~~~~~~
-
-* ``--syslog <syslog facility>``
-
- Set syslog facility. Valid syslog facilities are::
-
- auth
- cron
- daemon
- ftp
- kern
- lpr
- mail
- news
- syslog
- user
- uucp
- local0
- local1
- local2
- local3
- local4
- local5
- local6
- local7
diff --git a/doc/guides/prog_guide/log_lib.rst
b/doc/guides/prog_guide/log_lib.rst
index 504eefe1d2..abaedc7212 100644
--- a/doc/guides/prog_guide/log_lib.rst
+++ b/doc/guides/prog_guide/log_lib.rst
@@ -83,6 +83,23 @@ To prefix all console messages with ISO format time the
syntax is::
/path/to/app --log-timestamp=iso
+Log output
+~~~~~~~~~~
+
+If desired, messages can be redirected to syslog (on Linux and FreeBSD) with
the ``--syslog``
+option. There are three possible settings for this option:
+
+*always*
+ Redirect all log output to syslog.
+
+*auto*
+ Use console if it is a terminal, and use syslog if is not.
+
+*both*
+ Print to both console and syslog.
+
+If ``--syslog`` option is not specified, then only console (stderr) will be
used.
+
Using Logging APIs to Generate Log Messages
diff --git a/lib/eal/common/eal_common_options.c
b/lib/eal/common/eal_common_options.c
index aa1faad45c..6f0fd151c1 100644
--- a/lib/eal/common/eal_common_options.c
+++ b/lib/eal/common/eal_common_options.c
@@ -91,7 +91,7 @@ eal_long_options[] = {
{OPT_PROC_TYPE, 1, NULL, OPT_PROC_TYPE_NUM },
{OPT_SOCKET_MEM, 1, NULL, OPT_SOCKET_MEM_NUM },
{OPT_SOCKET_LIMIT, 1, NULL, OPT_SOCKET_LIMIT_NUM },
- {OPT_SYSLOG, 1, NULL, OPT_SYSLOG_NUM },
+ {OPT_SYSLOG, 2, NULL, OPT_SYSLOG_NUM },
{OPT_VDEV, 1, NULL, OPT_VDEV_NUM },
{OPT_VFIO_INTR, 1, NULL, OPT_VFIO_INTR_NUM },
{OPT_VFIO_VF_TOKEN, 1, NULL, OPT_VFIO_VF_TOKEN_NUM },
diff --git a/lib/log/log.c b/lib/log/log.c
index 2dca91306e..d8974c66db 100644
--- a/lib/log/log.c
+++ b/lib/log/log.c
@@ -13,15 +13,17 @@
#include <sys/queue.h>
#include <unistd.h>
+#ifdef RTE_EXEC_ENV_WINDOWS
+#include <rte_os_shim.h>
+#else
+#include <syslog.h>
+#endif
+
#include <rte_log.h>
#include <rte_per_lcore.h>
#include "log_internal.h"
-#ifdef RTE_EXEC_ENV_WINDOWS
-#include <rte_os_shim.h>
-#endif
-
struct rte_log_dynamic_type {
const char *name;
uint32_t loglevel;
@@ -36,14 +38,25 @@ enum eal_log_time_format {
EAL_LOG_TIMESTAMP_ISO,
};
+enum eal_log_syslog {
+ EAL_LOG_SYSLOG_NONE = 0, /* do not use syslog */
+ EAL_LOG_SYSLOG_AUTO, /* use syslog only if not a terminal */
+ EAL_LOG_SYSLOG_ALWAYS, /* always use syslog */
+ EAL_LOG_SYSLOG_BOTH, /* log to both syslog and stderr */
+};
+
typedef int (*log_print_t)(FILE *f, uint32_t level, const char *fmt, va_list
ap);
static int log_print(FILE *f, uint32_t level, const char *format, va_list ap);
+
/** The rte_log structure. */
static struct rte_logs {
uint32_t type; /**< Bitfield with enabled logs. */
uint32_t level; /**< Log level. */
FILE *file; /**< Output file set by rte_openlog_stream, or NULL. */
+#ifndef RTE_EXEC_ENV_WINDOWS
+ enum eal_log_syslog syslog_opt;
+#endif
log_print_t print_func;
enum eal_log_time_format time_format;
@@ -532,9 +545,23 @@ rte_log(uint32_t level, uint32_t logtype, const char
*format, ...)
/* Placeholder */
int
-eal_log_syslog(const char *mode __rte_unused)
+eal_log_syslog(const char *str)
{
+#ifdef RTE_EXEC_ENV_WINDOWS
+ RTE_SET_USED(str);
return -1;
+#else
+ if (str == NULL || strcmp(str, "auto") == 0)
+ /* log to syslog only if stderr is not a terminal */
+ rte_logs.syslog_opt = EAL_LOG_SYSLOG_AUTO;
+ else if (strcmp(str, "both") == 0)
+ rte_logs.syslog_opt = EAL_LOG_SYSLOG_BOTH;
+ else if (strcmp(str, "always") == 0)
+ rte_logs.syslog_opt = EAL_LOG_SYSLOG_ALWAYS;
+ else
+ return -1;
+ return 0;
+#endif
}
/* Set the log timestamp format */
@@ -706,17 +733,75 @@ log_print_with_timestamp(FILE *f, uint32_t level,
return log_print(f, level, format, ap);
}
+#ifndef RTE_EXEC_ENV_WINDOWS
/*
- * Called by rte_eal_init
+ * wrapper for log stream to put messages into syslog
+ * useful for cases like:
+ * rte_hex_dump(rte_get_log_stream(), ...)
*/
-void
-eal_log_init(const char *id __rte_unused)
+static ssize_t
+syslog_log_write(__rte_unused void *c, const char *buf, size_t size)
+{
+ /* Syslog error levels are from 0 to 7, so subtract 1 to convert */
+ syslog(rte_log_cur_msg_loglevel() - 1, "%.*s", (int)size, buf);
+ return size;
+}
+
+static int
+syslog_log_close(__rte_unused void *c)
{
+ closelog();
+ return 0;
+}
+
+static cookie_io_functions_t syslog_log_func = {
+ .write = syslog_log_write,
+ .close = syslog_log_close,
+};
+#endif
+
+
+/* Choose how log output is directed */
+static void
+log_output_selection(const char *id)
+{
+ RTE_SET_USED(id);
+
+#ifndef RTE_EXEC_ENV_WINDOWS
+ bool is_terminal = isatty(STDERR_FILENO);
+
+ if (!(rte_logs.syslog_opt == EAL_LOG_SYSLOG_NONE ||
+ (rte_logs.syslog_opt == EAL_LOG_SYSLOG_AUTO && is_terminal))) {
+ int flags = LOG_NDELAY | LOG_PID;
+
+#ifdef LOG_PERROR
+ if (rte_logs.syslog_opt == EAL_LOG_SYSLOG_BOTH)
+ flags |= LOG_PERROR;
+#endif
+ openlog(id, flags, is_terminal ? LOG_USER : LOG_DAEMON);
+
+ /* redirect other log messages to syslog as well */
+ FILE *log_stream = fopencookie(NULL, "w", syslog_log_func);
+ if (log_stream != NULL)
+ default_log_stream = log_stream;
+ return;
+ }
+#endif
if (rte_logs.time_format != EAL_LOG_TIMESTAMP_NONE)
rte_logs.print_func = log_print_with_timestamp;
+}
+/*
+ * Called by rte_eal_init
+ */
+void
+eal_log_init(const char *id)
+{
+ rte_logs.print_func = log_print;
default_log_stream = stderr;
+ log_output_selection(id);
+
#if RTE_LOG_DP_LEVEL >= RTE_LOG_DEBUG
RTE_LOG(NOTICE, EAL,
"Debug dataplane logs available - lower performance\n");
--
2.43.0
