[dpdk-dev] [PATCH v3 3/8] eal: change several log levels matching a regexp
Tan, Jianfeng
jianfeng.tan at intel.com
Fri Apr 14 07:40:31 CEST 2017
Hi Olivier,
On 4/5/2017 12:40 AM, Olivier Matz wrote:
> Introduce a function to set the log level of several log types that
> match a regular expression.
>
> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
> ---
> lib/librte_eal/bsdapp/eal/rte_eal_version.map | 1 +
> lib/librte_eal/common/eal_common_log.c | 21 +++++++++++++++++++++
> lib/librte_eal/common/include/rte_log.h | 12 ++++++++++++
> lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
> 4 files changed, 35 insertions(+)
>
> diff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
> index bd63ea66b..de74ff9ff 100644
> --- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map
> +++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map
> @@ -189,5 +189,6 @@ DPDK_17.05 {
> rte_log_dump;
> rte_log_register;
> rte_log_set_level;
> + rte_log_set_level_regexp;
>
> } DPDK_17.02;
> diff --git a/lib/librte_eal/common/eal_common_log.c b/lib/librte_eal/common/eal_common_log.c
> index 90326215b..d02689390 100644
> --- a/lib/librte_eal/common/eal_common_log.c
> +++ b/lib/librte_eal/common/eal_common_log.c
> @@ -37,6 +37,7 @@
> #include <stdlib.h>
> #include <string.h>
> #include <errno.h>
> +#include <regex.h>
>
> #include <rte_eal.h>
> #include <rte_log.h>
> @@ -132,6 +133,26 @@ rte_log_set_level(uint32_t type, uint32_t level)
> return 0;
> }
>
> +/* set level */
> +int
> +rte_log_set_level_regexp(const char *pattern, uint32_t level)
> +{
> + regex_t r;
> + size_t i;
> +
> + if (level > RTE_LOG_DEBUG)
> + return -1;
> +
> + for (i = 0; i < rte_logs.dynamic_types_len; i++) {
> + if (rte_logs.dynamic_types[i].name == NULL)
> + continue;
> + if (regexec(&r, pattern, 0, NULL, 0) == 0)
> + rte_logs.dynamic_types[i].loglevel = level;
When I try this option, it causes segment fault. The problem might lie
in this function. As far as I know, when we use regexec(), we need to
compile a regular expression firstly using regcomp(); and then call
regexec() with the compiled pattern with the full string. In other words:
regcomp(&r, pattern, 0);
for (i = 0; i < rte_logs.dynamic_types_len; i++) {
...
if (regexec(&r, rte_logs.dynamic_types[i].name, 0, NULL,
0) == 0)
rte_logs.dynamic_types[i].loglevel = level;
}
Thanks,
Jianfeng
> + }
> +
> + return 0;
> +}
> +
> /* get the current loglevel for the message beeing processed */
> int rte_log_cur_msg_loglevel(void)
> {
> diff --git a/lib/librte_eal/common/include/rte_log.h b/lib/librte_eal/common/include/rte_log.h
> index 97e0c5e52..ce48b0785 100644
> --- a/lib/librte_eal/common/include/rte_log.h
> +++ b/lib/librte_eal/common/include/rte_log.h
> @@ -157,6 +157,18 @@ uint32_t rte_get_log_type(void);
> /**
> * Set the log level for a given type.
> *
> + * @param pattern
> + * The regexp identifying the log type.
> + * @param level
> + * The level to be set.
> + * @return
> + * 0 on success, a negative value if level is invalid.
> + */
> +int rte_log_set_level_regexp(const char *pattern, uint32_t level);
> +
> +/**
> + * Set the log level for a given type.
> + *
> * @param logtype
> * The log type identifier.
> * @param level
> diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
> index ef48500e9..f70b4b937 100644
> --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
> +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
> @@ -193,5 +193,6 @@ DPDK_17.05 {
> rte_log_dump;
> rte_log_register;
> rte_log_set_level;
> + rte_log_set_level_regexp;
>
> } DPDK_17.02;
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