[patch] ubox: logread: add option to filter priority (log level)

[Isaev Ruslan]

This adds an ability to filter log messages priority:
  -v  <log level> handle only messages with given log level (0-7), repeatable
  -V  <log level> ignore messages with given log level (0-7), repeatable

Signed-off-by: Isaev Ruslan <legale.legale at gmail.com>
---
 log/logread.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/log/logread.c b/log/logread.c
index f48dd4b..91aae00 100644
--- a/log/logread.c
+++ b/log/logread.c
@@ -66,6 +66,8 @@ static int log_type = LOG_STDOUT;
 static int log_size, log_udp, log_follow, log_trailer_null = 0;
 static int log_timestamp;
 static int logd_conn_tries = LOGD_CONNECT_RETRY;
+static int loglevel_include;
+static int loglevel_exclude;
 static int facility_include;
 static int facility_exclude;

@@ -79,6 +81,16 @@ static int check_facility_filter(int f)
  return 1;
 }

+/* check for loglevel filter; return 0 if message shall be dropped */
+static int check_loglevel_filter(int f)
+{
+ if (loglevel_include)
+   return !!(loglevel_include & (1 << f));
+ if (loglevel_exclude)
+   return !(loglevel_exclude & (1 << f));
+ return 1;
+}
+
 static const char* getcodetext(int value, CODE *codetable) {
  CODE *i;

@@ -155,6 +167,9 @@ static int log_notify(struct blob_attr *msg)

  if (!check_facility_filter(LOG_FAC(p)))
      return 0;
+
+  if (!check_loglevel_filter(LOG_PRI(p)))
+    return 0;

  m = blobmsg_get_string(tb[LOG_MSG]);
  if (regexp_pattern &&
@@ -233,6 +248,8 @@ static int usage(const char *prog)
    "    -p <file>    PID file\n"
    "    -h <hostname>  Add hostname to the message\n"
    "    -P <prefix>  Prefix custom text to streamed messages\n"
+   "    -v <log level> handle only messages with given log level
(0-7), repeatable\n"
+   "    -V <log level> ignore messages with given log level (0-7),
repeatable\n"
    "    -z <facility>  handle only messages with given facility
(0-23), repeatable\n"
    "    -Z <facility>  ignore messages with given facility (0-23),
repeatable\n"
    "    -f     Follow log messages\n"
@@ -313,7 +330,7 @@ int main(int argc, char **argv)

  signal(SIGPIPE, SIG_IGN);

- while ((ch = getopt(argc, argv, "u0fcs:l:z:Z:r:F:p:S:P:h:e:t")) != -1) {
+ while ((ch = getopt(argc, argv, "u0fcs:l:v:V:z:Z:r:F:p:S:P:h:e:t")) != -1) {
    switch (ch) {
    case 'u':
      log_udp = 1;
@@ -343,6 +360,14 @@ int main(int argc, char **argv)
    case 'l':
      lines = atoi(optarg);
      break;
+   case 'v':
+     id = strtoul(optarg, NULL, 0) & 0x1f;
+     loglevel_include |= (1 << id);
+     break;
+   case 'V':
+     id = strtoul(optarg, NULL, 0) & 0x1f;
+     loglevel_exclude |= (1 << id);
+     break;
    case 'z':
      id = strtoul(optarg, NULL, 0) & 0x1f;
      facility_include |= (1 << id);
-- 
2.30.2